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cube.pas
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Pascal/Delphi Source File
|
1994-06-22
|
6KB
|
241 lines
program polygoned_cube;
{ THE very first polygoned cube }
uses crt;
const
vidseg:word=$a000;
dist=150;
point:array[0..7,0..2] of integer=(
(-35,-35,-35),(-35,-35,35),(35,-35,35),(35,-35,-35),
(-35, 35,-35),(-35, 35,35),(35, 35,35),(35, 35,-35));
planes:array[0..5,0..3] of byte=(
(0,4,5,1),(0,3,7,4),(0,1,2,3),(4,5,6,7),(7,6,2,3),(1,2,6,5));
type
tabtype=array[0..255] of integer;
planearray=array[0..5] of integer;
var
sintab:tabtype;
planez:planearray;
virscr:pointer;
virseg:word;
{----------------------------------------------------------------------------}
procedure setpal(c,r,g,b:byte); assembler;
asm
mov dx,3c8h
mov al,[c]
out dx,al
inc dx
mov al,[r]
out dx,al
mov al,[g]
out dx,al
mov al,[b]
out dx,al
end;
procedure cls(lvseg:word); assembler;
asm
mov es,[lvseg]
xor di,di
xor ax,ax
mov cx,320*200/2
rep stosw
end;
procedure flip(src,dst:word); assembler;
asm
push ds
mov es,[dst]
mov ds,[src]
xor si,si
xor di,di
mov cx,320*200/2
rep movsw
pop ds
end;
{----------------------------------------------------------------------------}
procedure Calcsinus(var SinTab : TabType); var I : byte; begin
for I := 0 to 255 do SinTab[I] := round(sin(2*I*pi/255)*128); end;
{----------------------------------------------------------------------------}
procedure quicksort(var a:planearray;lo,hi:integer);
procedure sort(l,r:integer);
var i,j,x,y: integer;
begin
i:=l; j:=r; x:=a[(l+r) div 2];
repeat
while a[i]<x do i:=i+1;
while x<a[j] do j:=j-1;
if i<=j then
begin
y:=a[i]; a[i]:=a[j]; a[j]:=y;
i:=i+1; j:=j-1;
end;
until i>j;
if l<j then sort(l,j);
if i<r then sort(i,r);
end;
begin
sort(lo,hi);
end;
{----------------------------------------------------------------------------}
procedure horline(xb,xe,y:integer; c:byte); assembler;
asm
mov bx,[xb]
cmp bx,0
jz @out
mov cx,[xe]
jcxz @out
cmp bx,cx
jb @skip
xchg bx,cx
@skip:
dec bx
inc cx
sub cx,bx
mov es,virseg
mov ax,[y]
shl ax,6
mov di,ax
shl ax,2
add di,ax
add di,bx
mov al,[c]
shr cx,1
jnc @skip2
stosb
@skip2:
mov ah,al
rep stosw
@out:
end;
procedure polygon(x1,y1,x2,y2,x3,y3,x4,y4:integer; c:byte);
var
xpos:array[0..199,0..1] of integer;
mny,mxy,y:integer;
i:word;
s1,s2,s3,s4:shortint;
begin
mny:=y1;
if y2<mny then mny:=y2;
if y3<mny then mny:=y3;
if y4<mny then mny:=y4;
mxy:=y1;
if y2>mxy then mxy:=y2;
if y3>mxy then mxy:=y3;
if y4>mxy then mxy:=y4;
s1:=byte(y1<y2)*2-1;
s2:=byte(y2<y3)*2-1;
s3:=byte(y3<y4)*2-1;
s4:=byte(y4<y1)*2-1;
y:=y1;
if y1<>y2 then repeat
xpos[y,byte(y1<y2)]:=integer(x2-x1)*(y-y1) div (y2-y1)+x1;
inc(y,s1);
until y=y2+s1 else xpos[y,byte(y1<y2)]:=x1;
y:=y2;
if y2<>y3 then repeat
xpos[y,byte(y2<y3)]:=integer(x3-x2)*(y-y2) div (y3-y2)+x2;
inc(y,s2);
until y=y3+s2 else xpos[y,byte(y2<y3)]:=x2;
y:=y3;
if y3<>y4 then repeat
xpos[y,byte(y3<y4)]:=integer(x4-x3)*(y-y3) div (y4-y3)+x3;
inc(y,s3);
until y=y4+s3 else xpos[y,byte(y3<y4)]:=x3;
y:=y4;
if y4<>y1 then repeat
xpos[y,byte(y4<y1)]:=integer(x1-x4)*(y-y4) div (y1-y4)+x4;
inc(y,s4);
until y=y1+s4 else xpos[y,byte(y1<y4)]:=x4;
for y:=mny to mxy do
horline(xpos[y,0],xpos[y,1],y,c);
end;
{----------------------------------------------------------------------------}
function sinus(i:byte):integer; begin sinus:=sintab[i]; end;
function cosinus(i:byte):integer; begin cosinus:=sintab[(i+192) mod 255]; end;
{----------------------------------------------------------------------------}
procedure Rotate;
const xst=2; yst=0; zst=-2;
var
xp,yp,z:array[0..7] of integer;
x,y,i,j,k:integer;
n,Key,phix,phiy,phiz:byte;
begin
phix:=0; phiy:=0; phiz:=0;
fillchar(xp,sizeof(xp),0);
fillchar(yp,sizeof(yp),0);
repeat
while (port[$3da] and 8) <> 8 do;
while (port[$3da] and 8) = 8 do;
setpal(0,0,0,50);
for n:=3 to 5 do
polygon(xp[planes[planez[n] and 7,0]],yp[planes[planez[n] and 7,0]],
xp[planes[planez[n] and 7,1]],yp[planes[planez[n] and 7,1]],
xp[planes[planez[n] and 7,2]],yp[planes[planez[n] and 7,2]],
xp[planes[planez[n] and 7,3]],yp[planes[planez[n] and 7,3]],0);
for n:=0 to 7 do begin
i:=(cosinus(phiy)*point[n,0]-sinus(phiy)*point[n,2]) div 128;
j:=(cosinus(phiz)*point[n,1]-sinus(phiz)*i) div 128;
k:=(cosinus(phiy)*point[n,2]+sinus(phiy)*point[n,0]) div 128;
x:=(cosinus(phiz)*i+sinus(phiz)*point[n,1]) div 128;
y:=(cosinus(phix)*j+sinus(phix)*k) div 128;
z[n]:=(cosinus(phix)*k-sinus(phix)*j) div 128;
xp[n]:=160+(-x*dist) div (z[n]-dist);
yp[n]:=100+(-y*dist) div (z[n]-dist);
end;
for n:=0 to 5 do
planez[n]:=(integer(z[planes[n,0]]+z[planes[n,1]]+
z[planes[n,2]]+z[planes[n,3]]) div 4)
shl 3+n;
quicksort(planez,0,5);
for n:=3 to 5 do
polygon(xp[planes[planez[n] and 7,0]],yp[planes[planez[n] and 7,0]],
xp[planes[planez[n] and 7,1]],yp[planes[planez[n] and 7,1]],
xp[planes[planez[n] and 7,2]],yp[planes[planez[n] and 7,2]],
xp[planes[planez[n] and 7,3]],yp[planes[planez[n] and 7,3]],(planez[n] and 7)+1);
inc(phix,xst); inc(phiy,yst); inc(phiz,zst);
setpal(0,0,0,0);
flip(virseg,vidseg);
until keypressed;
end;
{----------------------------------------------------------------------------}
var i:byte;
begin
Calcsinus(SinTab);
asm mov ax,13h; int 10h; end;
getmem(virscr,64000);
virseg:=seg(virscr^);
cls(virseg);
for i:=0 to 5 do setpal(i+1,10+i*2,30+i*2,10+i*2);
Rotate;
freemem(virscr,64000);
textmode(lastmode);
end.