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+<HTML>
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+<HEAD>
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+<META NAME="GENERATOR" Content="Microsoft Developer Studio">
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+<META HTTP-EQUIV="Content-Type" content="text/html; charset=iso-8859-1">
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+<TITLE>Getting Started In Blitz BASIC</TITLE>
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+</HEAD>
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+<body bgcolor="#206060" text="#ffff00" link="#00ff00"
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+vlink="#00ff00" alink="#00ff00">
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+<style>
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+<!--
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+ A:link {text-decoration: none;}
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+ A:visited {text-decoration: none;}
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+-->
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+</style>
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+<h2><font color="#FFFF00" face="MS Sans Serif"><strong>Getting
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+Started with BlitzBasic</strong></font></h2>
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+<hr>
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+<menu>
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+ <li><h4><a href="#first"><font face="MS Sans Serif">My First
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+ Program</font></a></h4>
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+ </li>
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+ <li><h4><a href="#variables"><font face="MS Sans Serif">Variables</font></a></h4>
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+ </li>
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+ <li><h4><a href="#firstgame"><font face="MS Sans Serif">My
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+ First Game</font></a></h4>
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+ </li>
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+ <li><h4><a href="#gettinggraphic"><font face="MS Sans Serif">Getting
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+ Graphic</font></a></h4>
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+ </li>
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+ <li><h4><a href="#doublebuffering"><font face="MS Sans Serif">Double
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+ Buffering</font></a></h4>
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+ </li>
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+ <li><h4><a href="#mysecondgame"><font face="MS Sans Serif">My
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+ Second Game</font></a></h4>
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+ </li>
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+</menu>
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+
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+<hr>
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+
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+<h4><a name="first"><font color="#A7E3F5" face="MS Sans Serif">My
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+First Program</font></a></h4>
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+
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+<p><font face="MS Sans Serif">After sampling some of the fine
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+example programs included in the BlitzBasic package you are
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+hopefully itching to try some of your own code.</font></p>
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+
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+<p><font face="MS Sans Serif">BlitzBasic is intended as both a
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+friendly introduction to programming computers as well as a
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+language capable of producing polished video game software.</font></p>
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+
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+<p><font face="MS Sans Serif">First up, the traditonal hello
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+world program. A simple one line program that prints the message
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+"hello world" on the screen. Select the File-New menu
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+option and enter the following text:</font></p>
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+<div align="center"><center>
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+
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+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
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+ <tr>
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+ <td><font color="#FFE75F" size="2" face="blitz">Print</font><font
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+ color="#FFFFFF" size="2" face="blitz"> </font><font
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+ color="#00FF00" size="2" face="blitz">"Hello World!"</font></td>
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+ </tr>
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+</table>
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+</center></div>
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+
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+<p><font face="MS Sans Serif">If you press the F5 key to compile
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+and run and a message greeting the world appears then </font><font
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+color="#80FF00" face="MS Sans Serif">congratulations!</font><font
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+face="MS Sans Serif"> you have just authored your first
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+BlitzBasic program.</font></p>
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+
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+<p><font face="MS Sans Serif">The following code illustrates
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+prompting the user of your program for some input.</font></p>
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+<div align="center"><center>
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+
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+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
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+ <tr>
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+ <td><font color="#FFFFFF" size="2" face="blitz">a</font><font
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+ color="#FFF0C8" size="2" face="blitz">=</font><font
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+ color="#FFE75F" size="2" face="blitz">Input</font><font
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+ color="#FFF0C8" size="2" face="blitz">(</font><font
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+ color="#00FF00" size="2" face="blitz">"enter a
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+ number sweety:"</font><font color="#FFF0C8" size="2"
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+ face="blitz">)</font><p><font color="#FFE75F" size="2"
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+ face="blitz">Print</font><font color="#FFFFFF" size="2"
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+ face="blitz"> </font><font color="#00FF00" size="2"
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+ face="blitz">"the value of a is "</font><font
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+ color="#FFFFFF" size="2" face="blitz"> </font><font
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+ color="#FFF0C8" size="2" face="blitz">+ </font><font
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+ color="#FFFFFF" size="2" face="blitz">a</font></p>
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+ </td>
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+ </tr>
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+</table>
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+</center></div>
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+
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+<p><font face="MS Sans Serif">Note: see how we add text and an
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+integer variable together to print them both on the same line.</font></p>
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+
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+<hr>
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+
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+<h4><a name="variables"><font color="#A7E3F5"
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+face="MS Sans Serif">Variables</font></a></h4>
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+
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+<p><font face="MS Sans Serif">Variables in Blitz are used to
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+store integers, floats and strings.</font></p>
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+
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+<p><font face="MS Sans Serif">The first time a float or a string
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+variable is used in your program it must be denoted with # or $
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+symbols .</font></p>
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+
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+<p><font face="MS Sans Serif">If the "a=" in the
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+program is changed to "a$=" Blitz will treat a as a
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+string variable which can then contain any text the user enters
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+instead of the integer number it originally converted the user's
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+reply into.</font></p>
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+<div align="center"><center>
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+
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+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
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+ <tr>
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+ <td><font color="#FFFFFF" size="2" face="blitz">a</font><font
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+ color="#FFF0C8" size="2" face="blitz">$=</font><font
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+ color="#FFE75F" size="2" face="blitz">Input</font><font
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+ color="#FFF0C8" size="2" face="blitz">(</font><font
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+ color="#00FF00" size="2" face="blitz">"enter a
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+ number sweety:"</font><font color="#FFF0C8" size="2"
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+ face="blitz">)</font><p><font color="#FFE75F" size="2"
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+ face="blitz">Print</font><font color="#FFFFFF" size="2"
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+ face="blitz"> </font><font color="#00FF00" size="2"
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+ face="blitz">"the value of a is "</font><font
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+ color="#FFFFFF" size="2" face="blitz"> </font><font
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+ color="#FFF0C8" size="2" face="blitz">+ </font><font
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+ color="#FFFFFF" size="2" face="blitz">a</font></p>
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+ </td>
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+ </tr>
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+</table>
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+</center></div>
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+
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+<p><font face="MS Sans Serif">Suggestion: change the "a$="
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+to "a#=" and enter the number 22.95. What's going on?</font></p>
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+
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+<hr>
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+
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+<h4><a name="firstgame"><font color="#A7E3F5"
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+face="MS Sans Serif">My First Game</font></a></h4>
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+
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+<p><font face="MS Sans Serif">The following program gives the
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+user 5 turns to guess the random number.</font></p>
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+<div align="center"><center>
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+
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+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
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+ <tr>
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+ <td><font color="#00FFFF" size="2" face="blitz">;
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+ guessing game</font><p><font color="#FFFFFF" size="2"
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+ face="blitz">turnsleft</font><font color="#FFF0C8"
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+ size="2" face="blitz">=</font><font color="#C8F0FF"
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+ size="2" face="blitz">5</font></p>
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+ <p><font color="#FFFFFF" size="2" face="blitz">sheep</font><font
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+ color="#FFF0C8" size="2" face="blitz">=</font><font
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+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
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+ color="#FFF0C8" size="2" face="blitz">(</font><font
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+ color="#C8F0FF" size="2" face="blitz">20</font><font
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+ color="#FFF0C8" size="2" face="blitz">)</font></p>
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+ <p><font color="#FFE75F" size="2" face="blitz">While</font><font
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+ color="#FFF0C8" size="2" face="blitz"> (</font><font
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+ color="#FFFFFF" size="2" face="blitz">turnsleft</font><font
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+ color="#FFF0C8" size="2" face="blitz">></font><font
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+ color="#C8F0FF" size="2" face="blitz">0</font><font
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+ color="#FFF0C8" size="2" face="blitz">)</font></p>
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+ <blockquote>
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+ <p><font color="#FFFFFF" size="2" face="blitz">turnsleft</font><font
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+ color="#FFF0C8" size="2" face="blitz">=</font><font
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+ color="#FFFFFF" size="2" face="blitz">turnsleft</font><font
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+ color="#FFF0C8" size="2" face="blitz">-</font><font
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+ color="#C8F0FF" size="2" face="blitz">1</font></p>
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+ <p><font color="#FFFFFF" size="2" face="blitz">guess</font><font
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+ color="#FFF0C8" size="2" face="blitz">=</font><font
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+ color="#FFE75F" size="2" face="blitz">Input</font><font
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+ color="#FFF0C8" size="2" face="blitz">(</font><font
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+ color="#00FF00" size="2" face="blitz">"guess how
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+ many sheep I have in my room:"</font><font
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+ color="#FFF0C8" size="2" face="blitz">)</font></p>
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+ <p><font color="#FFE75F" size="2" face="blitz">If</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFFFFF" size="2" face="blitz">guess</font><font
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+ color="#FFF0C8" size="2" face="blitz"><</font><font
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+ color="#FFFFFF" size="2" face="blitz">sheep</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Then</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Print</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#00FF00" size="2" face="blitz">"more than
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+ that!"</font></p>
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+ <p><font color="#FFE75F" size="2" face="blitz">If</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFFFFF" size="2" face="blitz">guess</font><font
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+ color="#FFF0C8" size="2" face="blitz">></font><font
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+ color="#FFFFFF" size="2" face="blitz">sheep</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Then</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Print</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#00FF00" size="2" face="blitz">"oh, not
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+ that many!</font></p>
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+ <p><font color="#FFE75F" size="2" face="blitz">If</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFFFFF" size="2" face="blitz">guess</font><font
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+ color="#FFF0C8" size="2" face="blitz">=</font><font
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+ color="#FFFFFF" size="2" face="blitz">sheep</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Then</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Exit</font></p>
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+ </blockquote>
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+ <p><font color="#FFE75F" size="2" face="blitz">Wend</font></p>
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+ <p><font color="#FFE75F" size="2" face="blitz">If</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFFFFF" size="2" face="blitz">turnsleft</font><font
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+ color="#FFF0C8" size="2" face="blitz">=</font><font
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+ color="#C8F0FF" size="2" face="blitz">0</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Then</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Print</font><font
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+ color="#FFF0C8" size="2" face="blitz"> </font><font
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+ color="#00FF00" size="2" face="blitz">"game over
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+ dude" </font><font color="#FFE75F" size="2"
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+ face="blitz">Else</font><font color="#FFF0C8" size="2"
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+ face="blitz"> </font><font color="#FFE75F" size="2"
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+ face="blitz">Print</font><font color="#FFF0C8" size="2"
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+ face="blitz"> </font><font color="#00FF00" size="2"
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+ face="blitz">"good guess!"</font></p>
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+ </td>
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+ </tr>
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+</table>
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+</center></div>
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+
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+<blockquote>
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+</blockquote>
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+
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+<p><font face="MS Sans Serif">There are three variables used in
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+this program: turnsleft, sheep and guess.</font></p>
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+
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+<p><font face="MS Sans Serif">To begin with, turnsleft is set to
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+5 and sheep is set to a random number between 0 and 20. The
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+program then enters a "while" loop asking the player to
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+guess a number, and comparing their answer which is placed in the
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+variable guess with the value in sheep.</font></p>
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+
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+<p><font face="MS Sans Serif">After playing the game a few times,
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+you may notice that the number of sheep does not vary much. Try
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+adding the following line to the top of the program to "seed"
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+the random number generator using the time of day in milliseconds.</font></p>
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+<div align="center"><center>
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+
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+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
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+ <tr>
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+ <td><font color="#FFE75F" size="2" face="blitz">SeedRnd
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+ MilliSecs</font><font color="#FFF0C8" size="2"
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+ face="blitz">()</font></td>
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+ </tr>
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+</table>
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+</center></div>
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+
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+<p><font face="MS Sans Serif">Congratulations, you have just
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+doubled the playability of the game with one line of code!</font></p>
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+
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+<hr>
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+
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+<h4><a name="gettinggraphic"><font color="#A7E3F5"
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+face="MS Sans Serif">Getting Graphic</font></a></h4>
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+
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+<p><font face="MS Sans Serif">BlitzBasic is not designed for
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+building text based application such as our initial guessing game.
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+It is also not designed for building applications featuring
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+friendly graphics user interfaces filled with windows and sliders.</font></p>
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+
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+<p><font face="MS Sans Serif">The only thing BlitzBasic has been
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+designed for is the very serious business of video game
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+development.</font></p>
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+
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+<p><font face="MS Sans Serif">The following program initializes a
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+640x480 video display then plots points at random positions until
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+the user presses the escape key.</font></p>
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+<div align="center"><center>
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+
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+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
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+ <tr>
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+ <td><font color="#00FFFF" size="2" face="blitz">; getting
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+ graphic</font><p><font color="#FFE75F" size="2"
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+ face="blitz">Graphics</font><font color="#00FFFF"
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+ size="2" face="blitz"> </font><font color="#C8F0FF"
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+ size="2" face="blitz">640</font><font color="#FFF0C8"
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+ size="2" face="blitz">,</font><font color="#C8F0FF"
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+ size="2" face="blitz">480</font></p>
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+ <p><font color="#FFE75F" size="2" face="blitz">While</font><font
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+ color="#00FFFF" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Not KeyDown</font><font
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+ color="#FFF0C8" size="2" face="blitz">(</font><font
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+ color="#C8F0FF" size="2" face="blitz">1</font><font
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+ color="#FFF0C8" size="2" face="blitz">)</font></p>
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+ <blockquote>
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+ <p><font color="#FFE75F" size="2" face="blitz">Plot</font><font
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+ color="#00FFFF" size="2" face="blitz"> </font><font
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+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
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+ color="#FFF0C8" size="2" face="blitz">(</font><font
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+ color="#C8F0FF" size="2" face="blitz">640</font><font
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+ color="#FFF0C8" size="2" face="blitz">),</font><font
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+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
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+ color="#FFF0C8" size="2" face="blitz">(</font><font
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+ color="#C8F0FF" size="2" face="blitz">480</font><font
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+ color="#FFF0C8" size="2" face="blitz">)</font></p>
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+ </blockquote>
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+ <p><font color="#FFE75F" size="2" face="blitz">Wend</font></p>
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+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Once again we rely on the random
|
|
|
+number generator to provide an interesting result. Try adding the
|
|
|
+following color command before the plot statement to vary the
|
|
|
+color of the dots.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">Color Rnd</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">256</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">),</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">256</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">),</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">256</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Although this may seem like a
|
|
|
+simple program, creating a DirectX display such as featured here
|
|
|
+using traditional methods can be a complex task. BlitzBasic makes
|
|
|
+it so easy!</font></p>
|
|
|
+
|
|
|
+<hr>
|
|
|
+
|
|
|
+<h4><a name="doublebuffering"><font color="#A7E3F5"
|
|
|
+face="MS Sans Serif">Double Buffering</font></a></h4>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">The following code illustrates the
|
|
|
+typical "main loop" of a game. For a video game to
|
|
|
+display smoothly animated graphics it must use a technique called
|
|
|
+"Double Buffering".</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">The following program shows one
|
|
|
+frame (the FrontBuffer) while drawing to another frame (the
|
|
|
+BackBuffer).</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#00FFFF" size="2" face="blitz">; double
|
|
|
+ buffering</font><p><font color="#FFE75F" size="2"
|
|
|
+ face="blitz">Graphics</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz"> </font><font color="#C8F0FF"
|
|
|
+ size="2" face="blitz">640</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz">,</font><font color="#C8F0FF"
|
|
|
+ size="2" face="blitz">480</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">SetBuffer</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz"> </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">BackBuffer</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">()</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">While</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz"> </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Not KeyDown</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Flip</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Cls</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Line</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz"> </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">320</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">240</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">320</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">+</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">100</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">*</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Cos</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">a</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">),</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">240</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">+</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">100</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">*</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Sin</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">a</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">a</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">a</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">+</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Wend</font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">In BlitzBasic the Flip command
|
|
|
+performs the double buffering by swapping the back and front
|
|
|
+buffers. The </font><font color="#FFFF00" face="MS Sans Serif">Cls</font><font
|
|
|
+face="MS Sans Serif"> command clears the screen and the </font><font
|
|
|
+color="#FFFF00" face="MS Sans Serif">Line</font><font
|
|
|
+face="MS Sans Serif"> command draws a line.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Note: the flip command also
|
|
|
+synchronizes to the video refresh which on standard VGA monitors
|
|
|
+is 60 frames per second. </font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">The program draws a line from the
|
|
|
+center of the screen (320,240) at an angle of a degrees, 100
|
|
|
+pixels long.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Try changing the program to add 6
|
|
|
+to the value of a. If the frame rate of your monitor is 60 frames
|
|
|
+per second, and a is incrementing by 6 each frame, in theory it
|
|
|
+should increment by 360 every second which is equivalent to a
|
|
|
+complete rotation in the world of degrees.</font></p>
|
|
|
+
|
|
|
+<hr>
|
|
|
+
|
|
|
+<h4><a name="mysecondgame"><font color="#A7E3F5"
|
|
|
+face="MS Sans Serif">My Second Game</font></a></h4>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">The following introduces the basic
|
|
|
+skeleton of a simple video game. </font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">The status variable contains the
|
|
|
+"state" of the game, which is either displaying a title
|
|
|
+page or allowing the player to steer round the screen. Extra
|
|
|
+states such as player dies with cosmic explosion and gameover
|
|
|
+screen would be added to extend the game further.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Reading through the program, the
|
|
|
+display is initialized in a similar manned to the previous
|
|
|
+example using the Graphics and SetBuffer commands. The main loop,
|
|
|
+then uses the Flip command to perform the double buffering (allowing
|
|
|
+us to draw to one screen while the other is displayed) and then
|
|
|
+either prints a message informing the user to press Enter to
|
|
|
+start or calls the UpdatePlayer() function.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#00FFFF" size="2" face="blitz">; eat the
|
|
|
+ dots</font><p><font color="#FFE75F" size="2" face="blitz">Graphics
|
|
|
+ </font><font color="#C8F0FF" size="2" face="blitz">640</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">480</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">SetBuffer
|
|
|
+ BackBuffer</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">()</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Global</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz"> status</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">#=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">#=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">speed</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">#=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">dir</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font></p>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">; main
|
|
|
+ loop</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">While Not</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz"> </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">KeyHit</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">; refresh
|
|
|
+ screen</font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Flip</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Cls</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Color </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Rect </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">640</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">480</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font></p>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">;
|
|
|
+ select state</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Select
|
|
|
+ </font><font color="#FFFFFF" size="2" face="blitz">status</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Case </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Locate
|
|
|
+ </font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">100</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">100</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Print
|
|
|
+ </font><font color="#00FF00" size="2"
|
|
|
+ face="blitz">"Press Enter To Start"</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">If
|
|
|
+ KeyHit</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">(28)</font><font color="#C8F0FF"
|
|
|
+ size="2" face="blitz"> </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">InitGame</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">() </font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Case </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">UpdatePlayer</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">()</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">End
|
|
|
+ Select</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Wend</font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">What UpdatePlayer() function you
|
|
|
+ask? And if the user presses Enter what's this InitGame()
|
|
|
+function?</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Unlike traditional BASIC languages
|
|
|
+where we would implement these functions as subroutines and call
|
|
|
+them with the Gosub command BlitzBasic features user defined
|
|
|
+functions. </font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Add the following two functions at
|
|
|
+the bottom of the above program to allow the program to run.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">The first function initializes the
|
|
|
+variables we will need inorder to steer the players rectangle
|
|
|
+around the screen. Note how these variables have been declared at
|
|
|
+the top of the program as Global which allows us to access them
|
|
|
+from inside functions such as InitGame().</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">Function</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz"> InitGame</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">()</font><blockquote>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">320</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">240</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">speed</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">dir</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">status</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">End
|
|
|
+ Function</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz"> </font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">This second function changes the
|
|
|
+players direction depending on the arrow key they are pressing or
|
|
|
+the direction of the joystick. The code then moves the players
|
|
|
+position (x,y) depending on the dir variable which corresponds to
|
|
|
+up, right, down and left respectively.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">Function </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">UpdatePlayer</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">()</font><blockquote>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">;
|
|
|
+ steer player </font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">If
|
|
|
+ KeyDown</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">(</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">200</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">) </font><font color="#FFE75F" size="2"
|
|
|
+ face="blitz">Or JoyY</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz">()<-</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">5 </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">dir</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">If
|
|
|
+ KeyDown</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">(</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">205</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">) </font><font color="#FFE75F" size="2"
|
|
|
+ face="blitz">Or JoyX</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz">()></font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">5 </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">dir</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">1</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">If
|
|
|
+ KeyDown</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">(</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">208</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">) </font><font color="#FFE75F" size="2"
|
|
|
+ face="blitz">Or JoyY</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz">()></font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">5 </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">dir</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">2</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">If
|
|
|
+ KeyDown</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">(</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">203</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">) </font><font color="#FFE75F" size="2"
|
|
|
+ face="blitz">Or JoyX</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz">()<-</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">5 </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">dir</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">3</font></p>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">; move
|
|
|
+ player</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Select
|
|
|
+ </font><font color="#FFFFFF" size="2" face="blitz">dir</font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Case
|
|
|
+ </font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">0 </font><font color="#FFFFFF"
|
|
|
+ size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">-</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">speed</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Case
|
|
|
+ </font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">1 </font><font color="#FFFFFF"
|
|
|
+ size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">+</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">speed</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Case
|
|
|
+ </font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">2 </font><font color="#FFFFFF"
|
|
|
+ size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">+</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">speed</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Case
|
|
|
+ </font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">3 </font><font color="#FFFFFF"
|
|
|
+ size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">-</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">speed</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">End
|
|
|
+ Select</font></p>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">; draw
|
|
|
+ player </font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Color </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Rect </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">End
|
|
|
+ Function</font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">After adding the InitGame() and
|
|
|
+UpdatePlayer() code the game should run.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Next it's time to add some deadly
|
|
|
+rocks and some yummy food. </font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">In order to do this we create some
|
|
|
+new Types that will hold all the information we need for each
|
|
|
+rock and food. To begin with these Types will simply hold the x
|
|
|
+and y position of each rock and food element we create for our
|
|
|
+game.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Place the following Type
|
|
|
+declarations at the top of the program.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">Type </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">food</font><blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Field </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">End Type</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Type </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">rock</font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Field </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">End Type</font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">The following code then needs to be
|
|
|
+added to the InitGame() function, insert it after the line that
|
|
|
+reads status=1.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">This code creates 20 rocks that
|
|
|
+will kill the player and 20 food that will speed the player up.
|
|
|
+The New command creates a new object and also adds it to a list.
|
|
|
+We set the position of each rock and food by setting the x and y
|
|
|
+fields of each new object created using the backslash \ character
|
|
|
+to denote which field.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">For </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">i</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0 </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">To </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">20 </font><blockquote>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">rock</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">New </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">rock</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">640</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">480</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Next</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">For </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">i</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0 </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">To </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">20 </font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">f</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">food</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">New </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">food</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">f</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">640</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ <p><font color="#FFFFFF" size="2" face="blitz">f</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Rnd</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">(</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">480</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Next</font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">We now need a function that draws
|
|
|
+all the food and rocks each frame and checks if the player has
|
|
|
+collided with any.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Note how we can loop through each
|
|
|
+food and rock element that exist using the For..Each command pair.
|
|
|
+This is another great feature of BlitzBasic that keeps programs
|
|
|
+simple and easy to read.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">We use the RectsOverlap command to
|
|
|
+check of the players position (x,y) collides with each food or
|
|
|
+rock element (f \ x , f \ y) or (r \ x , r \ y). If the player
|
|
|
+collides with some food we delete that piece of food and increase
|
|
|
+the player's speed. If the player collides with a rock we end the
|
|
|
+game by resetting the status variable.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">Function </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">UpdateRocksandFood</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">()</font><blockquote>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">; draw
|
|
|
+ food and check if eaten</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Color </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">For </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">f</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">food</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Each </font><font
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+ color="#FFFFFF" size="2" face="blitz">food </font></p>
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+ <blockquote>
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+ <p><font color="#FFE75F" size="2" face="blitz">Rect
|
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+ </font><font color="#FFFFFF" size="2"
|
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+ face="blitz">f</font><font color="#FFF0C8"
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+ size="2" face="blitz">\</font><font
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+ color="#FFFFFF" size="2" face="blitz">x</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
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+ color="#FFFFFF" size="2" face="blitz">f</font><font
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+ color="#FFF0C8" size="2" face="blitz">\</font><font
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+ color="#FFFFFF" size="2" face="blitz">y</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
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+ color="#C8F0FF" size="2" face="blitz">10</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
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+ color="#C8F0FF" size="2" face="blitz">10</font></p>
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+ <p><font color="#FFE75F" size="2" face="blitz">If
|
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+ RectsOverlap</font><font color="#FFF0C8" size="2"
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+ face="blitz">(</font><font color="#FFFFFF"
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+ size="2" face="blitz">x</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
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+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
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+ color="#C8F0FF" size="2" face="blitz">10</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
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+ color="#C8F0FF" size="2" face="blitz">10</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
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+ color="#FFFFFF" size="2" face="blitz">f</font><font
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+ color="#FFF0C8" size="2" face="blitz">\</font><font
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+ color="#FFFFFF" size="2" face="blitz">x</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
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+ color="#FFFFFF" size="2" face="blitz">f</font><font
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+ color="#FFF0C8" size="2" face="blitz">\</font><font
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+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
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+ color="#C8F0FF" size="2" face="blitz">10</font><font
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+ color="#FFF0C8" size="2" face="blitz">,</font><font
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+ color="#C8F0FF" size="2" face="blitz">10</font><font
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+ color="#FFF0C8" size="2" face="blitz">)</font></p>
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+ <blockquote>
|
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+ <p><font color="#FFFFFF" size="2"
|
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+ face="blitz">speed</font><font
|
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+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
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+ color="#FFFFFF" size="2" face="blitz">speed</font><font
|
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+ color="#FFF0C8" size="2" face="blitz">+</font><font
|
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+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
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+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
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|
+ color="#C8F0FF" size="2" face="blitz">2</font></p>
|
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|
+ <p><font color="#FFE75F" size="2"
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|
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+ face="blitz">Delete </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">f</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">EndIf
|
|
|
+ </font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Next</font></p>
|
|
|
+ <p><font color="#00FFFF" size="2" face="blitz">; draw
|
|
|
+ rocks and check for roadkill</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Color </font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">255</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">For </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">rock</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Each </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">rock </font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Rect
|
|
|
+ </font><font color="#FFFFFF" size="2"
|
|
|
+ face="blitz">r</font><font color="#FFF0C8"
|
|
|
+ size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font></p>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">If
|
|
|
+ RectsOverlap</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">(</font><font color="#FFFFFF"
|
|
|
+ size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">x</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">\</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">y</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">,</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">10</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">)</font></p>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFFFFF" size="2"
|
|
|
+ face="blitz">status</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#C8F0FF" size="2" face="blitz">0</font></p>
|
|
|
+ </blockquote>
|
|
|
+ </blockquote>
|
|
|
+ <blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">EndIf</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">Next</font></p>
|
|
|
+ </blockquote>
|
|
|
+ <p><font color="#FFE75F" size="2" face="blitz">End
|
|
|
+ Function</font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Oops, one last thing, don't forget
|
|
|
+to call the UpdateRocksandFood() function from the main loop,
|
|
|
+just after the UpdatePlayer() call should do nicely.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFFFFF" size="2" face="blitz">UpdateRocksandFood</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">()</font></td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">OK, after playing the game, a few
|
|
|
+things should become evident.</font></p>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">First, the player should die if
|
|
|
+they hit the outer wall. We could do this by checking if their
|
|
|
+position does not collide with the main screen rectangle (0,0,640,480).
|
|
|
+Try adding the following code to the UpdatePlayer function.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">If Not
|
|
|
+ RectsOverlap</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">(</font><font color="#FFFFFF" size="2"
|
|
|
+ face="blitz">x</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">,</font><font color="#FFFFFF" size="2"
|
|
|
+ face="blitz">y</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">,</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">10</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">,</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">10</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">,</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">0</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">,</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">0</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">,</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">630</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">,</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">470</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">) </font><font color="#FFFFFF" size="2"
|
|
|
+ face="blitz">status</font><font color="#FFF0C8" size="2"
|
|
|
+ face="blitz">=</font><font color="#C8F0FF" size="2"
|
|
|
+ face="blitz">0</font></td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+
|
|
|
+<p><font face="MS Sans Serif">Secondly, each time the game starts
|
|
|
+more rocks and food appear. This is because we never delete the
|
|
|
+food and rocks remaining from the last game. Insert the following
|
|
|
+code <strong>before</strong> the code that creates the new food
|
|
|
+and rocks in the InitGame() function.</font></p>
|
|
|
+<div align="center"><center>
|
|
|
+
|
|
|
+<table border="2" cellpadding="8" width="600" bgcolor="#006060">
|
|
|
+ <tr>
|
|
|
+ <td><font color="#FFE75F" size="2" face="blitz">For </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">f</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">food</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Each </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">food </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Delete </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">f </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Next</font><p><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">For </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">r</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">.</font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">rock</font><font
|
|
|
+ color="#FFF0C8" size="2" face="blitz">=</font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Each </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">rock </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Delete </font><font
|
|
|
+ color="#FFFFFF" size="2" face="blitz">r </font><font
|
|
|
+ color="#FFE75F" size="2" face="blitz">Next</font></p>
|
|
|
+ </td>
|
|
|
+ </tr>
|
|
|
+</table>
|
|
|
+</center></div>
|
|
|
+</BODY>
|
|
|
+</HTML>
|
blitz-research
