| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374 |
- <html>
- <head>
- <title>Blitz3D Docs</title>
- <link rel=stylesheet href=../css/commands.css type=text/css>
- </head>
- <body>
- <h1>RotateImage image,value#</h1>
- <h1>Parameters</h1>
- <table>
- <tr>
- <td>
- image = variable containing the image handle
<br />
- value# = floating number from 0 to 360 degrees
- </td>
- </tr>
- </table>
- <h1>Description</h1>
- <table>
- <tr>
- <td>
- I'm going to start this description off with:
<br />
-
<br />
- This command is not fast enough to render rotations in real time!
<br />
-
<br />
- Now, the purpose of this command is to rotate an image a specified number of degrees. Since it is slow, you will need to pre-calculate rotated images with this command. This means, before the program actually displays the images you rotate, you will want to rotate them ahead of time.
<br />
-
<br />
- This command automatically dithers/anti-aliases the rotated graphic image, so it might mess with your transparency. To avoid this issue, use the TFormFilter command. This will render the rotated images with bi-linear filtering.
<br />
-
<br />
- I'm going to end this command with:
<br />
-
<br />
- This command is not fast enough to render rotations in real time!
- </td>
- </tr>
- </table>
- <h1><a href=../2d_examples/RotateImage.bb>Example</a></h1>
- <table>
- <tr>
- <td>
- ; RotateImage/TFormFilter Example
<br />
-
<br />
- ; Turn on graphics mode
<br />
- Graphics 640,480,16
<br />
-
<br />
- ; Change the 0 to a 1 to see the difference
<br />
- ; between filter on and off.
<br />
- TFormFilter 0
<br />
-
<br />
- ; Create new empty graphic to store our circle in
<br />
- gfxBox=CreateImage(50,50)
<br />
-
<br />
- ; Draw the box image
<br />
- ; Set drawing operations to point to our new empty graphic
<br />
- SetBuffer ImageBuffer(gfxBox)
<br />
- Color 255,0,0
<br />
- ; Note the extra space between the box and the edge of the graphic
<br />
- Rect 10,10,30,30,1
<br />
- SetBuffer FrontBuffer()
<br />
-
<br />
- While Not KeyHit(1)
<br />
- ; Make a copy of the image so we are always using a fresh one each time
<br />
- ; we rotate it.
<br />
- gfxTemp=CopyImage(gfxBox)
<br />
- ; Rotate it a random value and draw it at a random location
<br />
- RotateImage gfxTemp,Rnd(360)
<br />
- DrawImage gfxTemp,Rnd(640),Rnd(480)
<br />
- Wend
- </td>
- </tr>
- </table>
- <br>
- <a target=_top href=../index.htm>Index</a><br>
- <br>
- Click <a href=http://www.blitzbasic.co.nz/b3ddocs/command.php?name=RotateImage&ref=comments target=_blank>here</a> to view the latest version of this page online</body>
- </html>
|
