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Floor.htm

Floor.htm 2.0 KB
Állandó hivatkozás Előzmények Nyers

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  1. <html>
    2. 

  2. <head>
    3. 

  3. <title>Blitz3D Docs</title>
    4. 

  4. <link rel=stylesheet href=../css/commands.css type=text/css>
    5. 

  5. </head>
    6. 

  6. <body>
    7. 

  7. <h1>Floor# ( y# )</h1>
    8. 

  8. <h1>Parameters</h1>
    9. 

  9. <table>
    10. 

  10. <tr>
    11. 

  11. <td>
    12. 

  12. y = any number
    13. 

  13. </td>
    14. 

  14. </tr>
    15. 

  15. </table>
    16. 

  16. <h1>Description</h1>
    17. 

  17. <table>
    18. 

  18. <tr>
    19. 

  19. <td>
    20. 

  20. Rounds downward, i.e. in the direction of -Infinity.

<br />
    21. 

  21. 
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    22. 

  22. It is a common mistake to think this simply sets everything after the decimal point to zero.

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    23. 

  23. But this is true only for positive numbers:

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    24. 

  24. 
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    25. 

  25. Floor(  1.75 ) ....... 1.0

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    26. 

  26. Floor( -1.75 ) .... -2.0

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    27. 

  27. 
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    28. 

  28. See also Ceil and Int for other types of rounding.
    29. 

  29. </td>
    30. 

  30. </tr>
    31. 

  31. </table>
    32. 

  32. <h1><a href=../2d_examples/Floor.bb>Example</a></h1>
    33. 

  33. <table>
    34. 

  34. <tr>
    35. 

  35. <td>
    36. 

  36. ; Ceil / Floor / Int example, three kinds of rounding.
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    37. 

  37. 
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    38. 

  38. ; Move mouse. Escape quits.
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    39. 

  39. 
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    40. 

  40. Graphics 640, 480
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    41. 

  41. 
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    42. 

  42. Const KEY_ESC = 1
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    43. 

  43. 
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    44. 

  44. SetBuffer BackBuffer()
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    45. 

  45. Origin 320, 240
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    46. 

  46. 
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    47. 

  47. MoveMouse 320, 240  :  HidePointer
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    48. 

  48. 
<br />
    49. 

  49. While Not KeyDown( KEY_ESC )
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    50. 

  50. 
<br />
    51. 

  51. Cls
<br />
    52. 

  52. 
<br />
    53. 

  53. my = MouseY() - 240
<br />
    54. 

  54. Color 100, 100, 0
<br />
    55. 

  55. Line -320, my, 319, my
<br />
    56. 

  56. 
<br />
    57. 

  57. DrawNumberLine
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    58. 

  58. 
<br />
    59. 

  59. y# = Float( -my ) / 32
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    60. 

  60. 
<br />
    61. 

  61. Text 100, 50, "          y = "  + y
<br />
    62. 

  62. Text 100, 70, "  Ceil( y ) = "  + Ceil( y )
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    63. 

  63. Text 100, 90, " Floor( y ) = "  + Floor( y )
<br />
    64. 

  64. Text 100, 110, "   Int( y ) = " + Int( y )
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    65. 

  65. 
<br />
    66. 

  66. Flip
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    67. 

  67. 
<br />
    68. 

  68. Wend
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    69. 

  69. End
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    70. 

  70. 
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    71. 

  71. Function DrawNumberLine( )  ; vertical line with numeric labels
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    72. 

  72. 
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    73. 

  73. Color 255, 255, 255
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    74. 

  74. Line 0, -240, 0, 239
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    75. 

  75. 
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    76. 

  76. For n = -7 To 7
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    77. 

  77. yn = -32 * n
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    78. 

  78. Line -2, yn, 2, yn
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    79. 

  79. Text -30, yn - 6, RSet( n, 2 )
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    80. 

  80. Next
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    81. 

  81. 
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    82. 

  82. End Function
    83. 

  83. </td>
    84. 

  84. </tr>
    85. 

  85. </table>
    86. 

  86. <br>
    87. 

  87. <a target=_top href=../index.htm>Index</a><br>
    88. 

  88. <br>
    89. 

  89. Click <a href=http://www.blitzbasic.co.nz/b3ddocs/command.php?name=Floor&ref=comments target=_blank>here</a> to view the latest version of this page online</body>
    90. 

  90. </html>
    91.