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Pascal/Delphi Source File  |  1994-04-21  |  6.7 KB  |  220 lines
  1. {$N+}
  2.  
  3. program _Rotation;
  4. { Slow rotating sphere, by Bas van Gaalen, Holland, PD }
  5. uses
  6.   crt,dos;
  7.  
  8. const
  9.   ScrBase : word = $a000;
  10.   NofPoints = 100;
  11.   Speed = 5;
  12.   Xc : real = 0;
  13.   Yc : real = 0;
  14.   Zc : real = 150;
  15.   SinTab : array[0..255] of integer = (
  16.     0,2,5,7,10,12,15,17,20,22,24,27,29,31,34,36,38,41,43,45,47,49,52,54,
  17.     56,58,60,62,64,66,67,69,71,73,74,76,78,79,81,82,83,85,86,87,88,90,91,
  18.     92,93,93,94,95,96,97,97,98,98,99,99,99,100,100,100,100,100,100,100,
  19.     100,99,99,99,98,98,97,97,96,95,95,94,93,92,91,90,89,88,87,85,84,83,
  20.     81,80,78,77,75,73,72,70,68,66,65,63,61,59,57,55,53,51,48,46,44,42,40,
  21.     37,35,33,30,28,26,23,21,18,16,14,11,9,6,4,1,-1,-4,-6,-9,-11,-14,-16,
  22.     -18,-21,-23,-26,-28,-30,-33,-35,-37,-40,-42,-44,-46,-48,-51,-53,-55,
  23.     -57,-59,-61,-63,-65,-66,-68,-70,-72,-73,-75,-77,-78,-80,-81,-83,-84,
  24.     -85,-87,-88,-89,-90,-91,-92,-93,-94,-95,-95,-96,-97,-97,-98,-98,-99,
  25.     -99,-99,-100,-100,-100,-100,-100,-100,-100,-100,-99,-99,-99,-98,-98,
  26.     -97,-97,-96,-95,-94,-93,-93,-92,-91,-90,-88,-87,-86,-85,-83,-82,-81,
  27.     -79,-78,-76,-74,-73,-71,-69,-67,-66,-64,-62,-60,-58,-56,-54,-52,-49,
  28.     -47,-45,-43,-41,-38,-36,-34,-31,-29,-27,-24,-22,-20,-17,-15,-12,-10,
  29.     -7,-5,-2,0);
  30.  
  31. type
  32.   PointRec = record
  33.                X,Y,Z : integer;
  34.              end;
  35.   PointPos = array[0..NofPoints] of PointRec;
  36.  
  37. var
  38.   Point : PointPos;
  39.  
  40. {----------------------------------------------------------------------------}
  41.  
  42. procedure SetGraphics(Mode : byte); assembler;
  43. asm mov AH,0; mov AL,Mode; int 10h; end;
  44.  
  45. {----------------------------------------------------------------------------}
  46.  
  47. procedure Init;
  48.  
  49. const
  50.   CoorTab : array[0..199,0..2] of integer = (
  51. (6,50,2),(14,45,18),(25,39,-18),(-28,14,39),
  52. (11,33,36),(-11,36,33),(25,34,26),(41,-29,-4),(40,-28,11),
  53. (7,33,36),(-9,17,-46),(-28,-40,-12),(-3,25,-43),(16,32,35),
  54. (-26,-27,33),(-35,19,-30),(4,36,-34),(27,41,7),(29,-39,14),
  55. (-41,-28,-6),(31,-32,-23),(32,34,-18),(-25,-27,-34),(-19,-46,0),
  56. (41,-27,-7),(-42,13,-23),(-5,-47,-17),(-36,-34,8),(-23,2,44),
  57. (-27,-25,34),(-25,-32,29),(-39,22,22),(41,19,20),(29,25,-32),
  58. (10,49,-4),(9,-48,-10),(39,-31,3),(16,32,35),(-39,-19,-24),
  59. (-25,-36,-25),(-26,8,-42),(-20,45,-5),(34,-21,30),(-40,30,2),
  60. (-39,31,3),(17,24,40),(34,-35,9),(-26,32,28),(-50,-1,3),
  61. (31,-14,36),(30,32,-24),(-21,45,4),(31,-8,-38),(-35,26,-24),
  62. (-5,-31,-39),(-17,4,-47),(-37,18,-29),(-36,11,33),(45,22,-5),
  63. (38,31,9),(43,-20,-17),(16,-44,-17),(11,35,-34),(16,-32,-35),
  64. (-34,-31,19),(-26,40,17),(-21,37,26),(30,32,-24),(6,-47,15),
  65. (40,-23,-19),(44,5,-23),(6,-29,40),(8,-28,-40),(25,43,4),
  66. (29,31,26),(-44,20,12),(-14,31,37),(9,-26,41),(-27,34,-25),
  67. (-12,45,19),(-3,-37,-33),(-32,2,-38),(-11,41,-26),(1,47,-18),
  68. (-25,0,-44),(-24,-44,3),(3,-50,-1),(-11,31,37),(2,32,-39),
  69. (-39,29,13),(42,28,0),(-4,-40,29),(21,-15,-43),(-9,45,-20),
  70. (-10,-23,-43),(33,-11,36),(14,-31,-36),(15,48,-3),(41,6,-28),
  71. (-25,-18,-39),(-33,33,-16),(-44,20,14),(-9,44,22),(11,-24,43),
  72. (-20,21,-41),(-36,-18,-30),(11,38,-30),(17,31,-36),(-49,-5,5),
  73. (-36,-34,-6),(-8,-29,40),(-7,26,-42),(23,-21,39),(46,-8,18),
  74. (-1,-10,49),(37,5,-33),(-12,-45,-19),(-27,-42,-5),(36,33,9),
  75. (-27,22,36),(29,-28,-29),(25,28,-33),(6,11,-48),(23,39,20),
  76. (1,-37,34),(36,-32,-14),(-47,13,-10),(28,-39,-13),(-26,-13,41),
  77. (7,-46,-17),(11,33,-36),(-36,-34,2),(29,24,33),(11,40,-28),
  78. (-19,41,22),(34,-35,-12),(-27,-32,-27),(50,-1,-3),(-17,-35,32),
  79. (-30,11,-38),(12,7,48),(-43,25,9),(-25,37,24),(-30,-36,-17),
  80. (-36,-16,30),(29,-36,-19),(-42,18,21),(18,-12,45),(-25,33,28),
  81. (12,39,-29),(-37,-32,10),(-32,-4,38),(38,19,-27),(-23,-22,38),
  82. (25,42,12),(22,-38,23),(2,-49,-7),(40,31,1),(38,22,23),
  83. (18,-32,-34),(-25,29,-32),(10,25,42),(-25,42,-12),(36,24,26),
  84. (21,44,-9),(32,35,15),(17,16,-44),(-43,-21,14),(-31,21,33),
  85. (-29,3,-40),(35,-35,2),(-18,43,17),(-2,38,-32),(-17,-32,-34),
  86. (18,-31,-35),(-32,6,38),(-29,40,4),(-17,37,29),(42,-26,-6),
  87. (-43,-17,19),(-43,-19,17),(29,-26,31),(-6,38,-31),(-33,-24,29),
  88. (33,28,25),(39,-24,19),(-40,-16,-26),(-19,-29,-36),(46,15,14),
  89. (-21,31,-33),(-24,-38,-22),(-36,-35,1),(-29,-22,34),(-34,-34,-12),
  90. (14,33,35),(6,50,-1),(-14,48,-3),(6,2,50),(13,46,-15),
  91. (1,-27,42));
  92.  
  93. var
  94.   I : byte;
  95.  
  96. begin
  97.   randomize;
  98.   for I := 0 to NofPoints do begin
  99.     Point[I].X := CoorTab[I,0];
  100.     Point[I].Y := CoorTab[I,1];
  101.     Point[I].Z := CoorTab[I,2];
  102.   end;
  103. end;
  104.  
  105. {----------------------------------------------------------------------------}
  106.  
  107. procedure InitColors;
  108.  
  109. var
  110.   I : byte;
  111.  
  112.   procedure SetColor(Color,Red,Green,Blue : byte);
  113.  
  114.   begin
  115.     port[$3C8] := Color;
  116.     port[$3C9] := Red;
  117.     port[$3C9] := Green;
  118.     port[$3C9] := Blue;
  119.   end;
  120.  
  121. begin
  122.   for I := 0 to 63 do SetColor(I+1,0,I,I);
  123. end;
  124.  
  125. {----------------------------------------------------------------------------}
  126.  
  127. procedure DoRotation;
  128.  
  129. const
  130.   Xstep = 0;
  131.   Ystep = 2;
  132.   Zstep = 0;
  133.  
  134. var
  135.   Xp,Yp : array[0..NofPoints] of word;
  136.   X,Y,Z,X1,Y1,Z1 : real;
  137.   PhiX,PhiY,PhiZ : byte;
  138.   I,Color : byte;
  139.  
  140. function Sinus(Idx : byte) : real;
  141.  
  142. begin
  143.   Sinus := SinTab[Idx]/100;
  144. end;
  145.  
  146. function Cosinus(Idx : byte) : real;
  147.  
  148. begin
  149.   Cosinus := SinTab[(Idx+192) mod 255]/100;
  150. end;
  151.  
  152. begin
  153.   PhiX := 0; PhiY := 0; PhiZ := 0;
  154.   repeat
  155.     while (port[$3da] and 8) <> 8 do;
  156.     while (port[$3da] and 8) = 8 do;
  157.     for I := 0 to NofPoints do begin
  158.  
  159.       if (Xp[I]+160 < 320) and (Yp[I]+100 < 200) then
  160.         mem[$a000:(Yp[I]+100)*320+Xp[I]+160] := 0;
  161.  
  162.       {
  163.       asm
  164.         push ds
  165.  
  166.         xor bh,bh
  167.         mov bl,I
  168.         mov ax,word ptr offset Yp
  169.         add ax,100
  170.         mov cx,320
  171.         mul cx
  172.  
  173.         mov cx,word ptr offset Xp
  174.         add cx,160
  175.         add ax,cx
  176.  
  177.         mov di,ax
  178.         mov es,ScrBase
  179.  
  180.         mov al,50
  181.         stosb
  182.  
  183.         pop ds
  184.       end;
  185.       }
  186.  
  187.       X1 := Cosinus(PhiY)*Point[I].X-Sinus(PhiY)*Point[I].Z;
  188.       Z1 := Sinus(PhiY)*Point[I].X+Cosinus(PhiY)*Point[I].Z;
  189.       X := Cosinus(PhiZ)*X1+Sinus(PhiZ)*Point[I].Y;
  190.       Y1 := Cosinus(PhiZ)*Point[I].Y-Sinus(PhiZ)*X1;
  191.       Z := Cosinus(PhiX)*Z1-Sinus(PhiX)*Y1;
  192.       Y := Sinus(PhiX)*Z1+Cosinus(PhiX)*Y1;
  193.  
  194.       Xp[I] := round((Xc*Z-X*Zc)/(Z-Zc));
  195.       Yp[I] := round((Yc*Z-Y*Zc)/(Z-Zc));
  196.       if (Xp[I]+160 < 320) and (Yp[I]+100 < 200) then begin
  197.         Color := 30+round(Z/5);
  198.         {if Color > 31 then Color := 31
  199.         else if Color < 16 then Color := 16;}
  200.         mem[$a000:(Yp[I]+100)*320+Xp[I]+160] := Color;
  201.       end;
  202.  
  203.       {inc(Point[I].Z,Speed); if Point[I].Z > 125 then Point[I].Z := -125;}
  204.     end;
  205.     inc(PhiX,Xstep);
  206.     inc(PhiY,Ystep);
  207.     inc(PhiZ,Zstep);
  208.   until keypressed;
  209. end;
  210.  
  211. {----------------------------------------------------------------------------}
  212.  
  213. begin
  214.   SetGraphics($13);
  215.   Init;
  216.   InitColors;
  217.   DoRotation;
  218.   textmode(lastmode);
  219. end.
  220.