/
3d_shortreal.pas
164 lines (123 loc) · 3.92 KB
/
3d_shortreal.pas
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program three_d;
{$f $80}
uses
atari, crt, fastgraph;
const
sz : byte = 16;
cx : byte = 79;
cy : byte = 50;
var
angle : shortreal = 0.0;
pts : array[0..7, 0..3] of shortint;
rzp : array[0..7, 0..3] of shortreal;
ryp : array[0..7, 0..3] of shortreal;
rxp : array[0..7, 0..3] of shortreal;
X1, X2, Y1, Y2 : byte;
var buf1, buf2 : TDisplayBuffer;
procedure init_points;
begin
pts[0,0] := -1; pts[0,1] := -1; pts[0,2] := -1;
pts[1,0] := 1; pts[1,1] := -1; pts[1,2] := -1;
pts[2,0] := 1; pts[2,1] := 1; pts[2,2] := -1;
pts[3,0] := -1; pts[3,1] := 1; pts[3,2] := -1;
pts[4,0] := -1; pts[4,1] := -1; pts[4,2] := 1;
pts[5,0] := 1; pts[5,1] := -1; pts[5,2] := 1;
pts[6,0] := 1; pts[6,1] := 1; pts[6,2] := 1;
pts[7,0] := -1; pts[7,1] := 1; pts[7,2] := 1;
end;
procedure rotate_points;
var
n: byte;
sn, cs: shortreal;
begin
sn := sin(angle);
cs := cos(angle);
for n := 0 To 7 do begin
rzp[n,0] := -cs * pts[n,0] + sn * pts[n,1];
rzp[n,1] := sn * pts[n,0] + cs * pts[n,1];
rzp[n,2] := pts[n,2];
ryp[n,0] := cs * rzp[n,0] + sn * rzp[n,2];
ryp[n,1] := rzp[n,1];
ryp[n,2] := -sn * rzp[n,0] + cs * rzp[n,2];
rxp[n,0] := ryp[n,0];
rxp[n,1] := cs * ryp[n,1] - sn * ryp[n,2];
rxp[n,2] := sn * ryp[n,1] + cs * ryp[n,2];
end;
end;
procedure draw_lines;
begin
X1 := Trunc(ryp[0,0] * sz + cx);
Y1 := Trunc(ryp[0,1] * sz + cy);
X2 := Trunc(ryp[1,0] * sz + cx);
Y2 := Trunc(ryp[1,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[1,0] * sz + cx);
Y1 := Trunc(ryp[1,1] * sz + cy);
X2 := Trunc(ryp[2,0] * sz + cx);
Y2 := Trunc(ryp[2,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[2,0] * sz + cx);
Y1 := Trunc(ryp[2,1] * sz + cy);
X2 := Trunc(ryp[3,0] * sz + cx);
Y2 := Trunc(ryp[3,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[3,0] * sz + cx);
Y1 := Trunc(ryp[3,1] * sz + cy);
X2 := Trunc(ryp[0,0] * sz + cx);
Y2 := Trunc(ryp[0,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[4,0] * sz + cx);
Y1 := Trunc(ryp[4,1] * sz + cy);
X2 := Trunc(ryp[5,0] * sz + cx);
Y2 := Trunc(ryp[5,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[5,0] * sz + cx);
Y1 := Trunc(ryp[5,1] * sz + cy);
X2 := Trunc(ryp[6,0] * sz + cx);
Y2 := Trunc(ryp[6,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[6,0] * sz + cx);
Y1 := Trunc(ryp[6,1] * sz + cy);
X2 := Trunc(ryp[7,0] * sz + cx);
Y2 := Trunc(ryp[7,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[7,0] * sz + cx);
Y1 := Trunc(ryp[7,1] * sz + cy);
X2 := Trunc(ryp[4,0] * sz + cx);
Y2 := Trunc(ryp[4,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[0,0] * sz + cx);
Y1 := Trunc(ryp[0,1] * sz + cy);
X2 := Trunc(ryp[4,0] * sz + cx);
Y2 := Trunc(ryp[4,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[1,0] * sz + cx);
Y1 := Trunc(ryp[1,1] * sz + cy);
X2 := Trunc(ryp[5,0] * sz + cx);
Y2 := Trunc(ryp[5,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[2,0] * sz + cx);
Y1 := Trunc(ryp[2,1] * sz + cy);
X2 := Trunc(ryp[6,0] * sz + cx);
Y2 := Trunc(ryp[6,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
X1 := Trunc(ryp[3,0] * sz + cx);
Y1 := Trunc(ryp[3,1] * sz + cy);
X2 := Trunc(ryp[7,0] * sz + cx);
Y2 := Trunc(ryp[7,1] * sz + cy);
fLine(X1,Y1,X2,Y2);
end;
begin
NewDisplayBuffer(buf1, 7 + 16, $c0); // ramtop = $c0
NewDisplayBuffer(buf2, 7 + 16, $a0); // ramtop = $a0
SetColor(1);
init_points;
repeat
pause;
SwitchDisplayBuffer(buf1, buf2);
rotate_points;
draw_lines;
angle := angle + 0.1;
until keypressed;
end.
// 7773