macintosh_cookbook/examples/ifs.pas
2020-05-08 21:02:19 +09:00

88 lines
1.5 KiB
ObjectPascal

program ExampleIFS;
const
pixdim = 120;
type
pic = array[1..pixdim, 1..pixdim] of Boolean;
vec = array[1..4] of Real;
dimvec = array[1..4] of Integer;
var
s, t: pic;
a, b, c, d, e, f, p: vec;
x, y: dimvec;
i, j, k, dpix: Integer;
box: rect;
procedure pset (x, y: integer);
begin
Moveto(x, y);
Lineto(x, y);
end;
procedure DefineObject (var t: pic);
var
i, j: Integer;
begin
for i := 1 to pixdim do
for j := 1 to pixdim do
if j < i then
begin
t[i, j] := true;
pset(i, j);
end;
SetRect(box, 1, 1, pixdim, pixdim);
end;
procedure SetCoef (var a, b, c, d, e, f: vec);
var
i: Integer;
begin
for i := 1 to 3 do
begin
a[i] := 0.5;
b[i] := 0;
c[i] := 0;
d[i] := 0.5;
e[i] := pixdim / 2;
f[i] := 1;
end;
e[1] := 1;
f[3] := pixdim / 2;
end;
begin
ShowDrawing;
DefineObject(t);
SetCoef(a, b, c, d, e, f);
dpix := pixdim div 2;
repeat
for i := 1 to pixdim do
for j := 1 to pixdim do
if t[i, j] then
begin
for k := 1 to 3 do
begin
x[k] := trunc(a[k] * i + b[k] * j + e[k]);
y[k] := trunc(c[k] * i + d[k] * j + f[k]);
s[x[k], y[k]] := true;
end;
end;
EraseRect(box);
for i := 1 to pixdim do
for j := 1 to pixdim do
begin
t[i, j] := s[i, j];
s[i, j] := false;
if t[i, j] then
pset(i, j);
end;
dpix := dpix div 2;
Writeln('dpix = ', dpix);
until button or (dpix < 1)
end.