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program FastEllipseDrawingDemo; {02-04-96,04-08-97}

uses Crt, Dos;

const maxX = 319;
maxY = 199; {video mode 19: 320x200/256}
var v:array[0..maxY,0..maxX] of byte absolute $A000:0;
{
procedure PutPixel (x,y: integer; color: byte);
begin v[y,x] := color; end;
}
procedure PutPixel (x,y: integer; color: byte); assembler;
asm
mov ax,0A000h
mov es,ax {es = $A000}
mov ax,y
shl ax,6
mov bx,ax {bx = y * 64}
shl ax,1
shl ax,1 {ax = y * 256}
add bx,ax {bx = y * 320}
add bx,x {bx = y * 320 + x}
mov al,color {load color}
mov es:,al {set point}
[B]end;

procedure DrawEllipse (mx,my, a,b, color: integer);

var x, mx1,mx2, my1,my2: integer;
aq,bq, dx,dy, r,rx,ry: longint;

begin
PutPixel (mx + a, my, color);
PutPixel (mx - a, my, color);

mx1 := mx - a; my1 := my;
mx2 := mx + a; my2 := my;

aq := longint (a) * a; {calc sqr}
bq := longint (b) * b;
dx := aq shl 1; {dx := 2 * a * a}
dy := bq shl 1; {dy := 2 * b * b}
r := a * bq; {r := a * b * b}
rx := r shl 1; {rx := 2 * a * b * b}
ry := 0; {because y = 0}
x := a;

while x > 0
do begin
if r > 0
then begin { y + 1 }
inc (my1); dec (my2);
inc (ry, dx); {ry = dx * y}
dec (r, ry); {r = r - dx + y}
end;
if r <= 0
then begin { x - 1 }
dec (x);
inc (mx1); dec (mx2);
dec (rx, dy); {rx = dy * x}
inc (r, rx); {r = r + dy * x}
end;
PutPixel (mx1, my1, color);
PutPixel (mx1, my2, color);
PutPixel (mx2, my1, color);
PutPixel (mx2, my2, color);
end;
end;

var a,b: integer; r: registers;

begin
r.ax:=$13; Intr($10,r);
repeat
a := 1+Random (100);
b := 1+Random (99);
DrawEllipse (a + Random (maxX - 2 * a),
b + Random (maxY - 2 * b), a,b,
1 + Random (255));
until keypressed;
TextMode(3);
end.

{ ------------------------ CUT HERE ------------------ }
{$A+,B+,G-,I-,O-,V-,D-,L-,Q-,R-,S-,E-,N- TP 7.0 Opt.}

program FastEllipseDrawingDemo320x400; {02-05-96}

uses Crt, Dos;

{************************************************* *******}
procedure SetTweakedMode320x400;

var r: registers;

begin
r.ax:=$13; Intr($10,r); {video mode 19: 320x200/256}
portw[$3c4] := $0604; {>64KByte Video-Ram, chain4 mode off}
portw[$3d4] := $4009; {max. scan line = 400}
portw[$3d4] := $0014; {word mode}
portw[$3d4] := $E317; {mode control}
FillChar (ptr($A000,0)^, $8000, 0); {clear memory}
end;
{************************************************* ********}
procedure PutPixel (x,y: integer; color: word);

begin
{ if x < 0 then exit;
if y < 0 then exit; }
port[$03C4] := 2; {plane selection}
port[$03C5] := 1 shl (x and 3);
mem [$A000: word (y shl 6 + y shl 4 + (x shr 2))] := color;
end;
{************************************************* ********}
procedure DrawEllipse (mx,my, a,b, color: integer);

var x, mx1,mx2, my1,my2: integer;
aq,bq, dx,dy, r,rx,ry: longint;

begin
PutPixel (mx + a, my, color);
PutPixel (mx - a, my, color);

mx1 := mx - a; my1 := my;
mx2 := mx + a; my2 := my;

aq := longint (a) * a; {calc sqr}
bq := longint (b) * b;
dx := aq shl 1; {dx := 2 * a * a}
dy := bq shl 1; {dy := 2 * b * b}
r := a * bq; {r := a * b * b}
rx := r shl 1; {rx := 2 * a * b * b}
ry := 0; {because y = 0}
x := a;

while x > 0
do begin
if r > 0
then begin { y + 1 }
inc (my1); dec (my2);
inc (ry, dx); {ry = dx * y}
dec (r, ry); {r = r - dx + y}
end;
if r <= 0
then begin { x - 1 }
dec (x);
inc (mx1); dec (mx2);
dec (rx, dy); {rx = dy * x}
inc (r, rx); {r = r + dy * x}
end;
PutPixel (mx1, my1, color);
PutPixel (mx1, my2, color);
PutPixel (mx2, my1, color);
PutPixel (mx2, my2, color);
end;
end;
{************************************************* ********}
const maxX = 319; maxY = 399;

var a,b: integer;

begin
SetTweakedMode320x400;
repeat
a := 1+Random (100);
b := 1+Random (100);
DrawEllipse (a + Random (maxX - 2 * a),
b + Random (maxY - 2 * b), a,b,
1 + Random (255));
until keypressed;
TextMode(3);
end