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procedure TForm1.PaintBox1Paint(Sender: TObject);
var
t: Cardinal;
d: Cardinal;
i: Integer;
r: TRect;
x,y: Integer;
w: Integer;
cs, sn: Single;
c: Integer;
begin
t := GetTickCount;
if FTicks = 0 then
begin
d := 0;
FTicks := t;
end else begin
d := (t - FTicks) mod 4000;
end;
with PaintBox1.Canvas do
begin
Brush.Color := Self.Color;
FillRect(PaintBox1.ClientRect);
x := PaintBox1.Width div 2;
y := PaintBox1.Height div 2;
w := 2 * x div 3;
for i := 0 to 7 do
begin
c := 255 - 64 + Round(32 * Cos(PI * i / 4));
Brush.Color := RGB(c, c, c);
SinCos(PI * ((1 + i/4) * Cos(PI * d / 4000)), cs, sn);
r.Left := x + Round(w * cs) - 2;
r.Top := y + Round(w * sn) - 2;
r.Right := r.Left + 4;
r.Bottom := r.Top + 4;
FillRect(r);
end;
end;
end; |