54 lines
1.3 KiB
Text
54 lines
1.3 KiB
Text
const
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SIZE = 256;
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NUM_PARTICLES = 1000;
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procedure TForm1.Button1Click(Sender: TObject);
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type
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TByteArray = array[0..0] of Byte;
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PByteArray = ^TByteArray;
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var
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B: TBitmap;
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I: Integer;
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P, D: TPoint;
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begin
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Randomize;
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B := TBitmap.Create;
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try
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B.Width := SIZE;
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B.Height := SIZE;
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B.PixelFormat := pf8bit;
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B.Canvas.Brush.Color := clBlack;
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B.Canvas.FillRect(B.Canvas.ClipRect);
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B.Canvas.Pixels[Random(SIZE), Random(SIZE)] := clWhite;
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For I := 0 to NUM_PARTICLES - 1 do
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Begin
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P.X := Random(SIZE);
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P.Y := Random(SIZE);
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While true do
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Begin
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D.X := Random(3) - 1;
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D.Y := Random(3) - 1;
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Inc(P.X, D.X);
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Inc(P.Y, D.Y);
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If ((P.X or P.Y) < 0) or (P.X >= SIZE) or (P.Y >= SIZE) Then
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Begin
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P.X := Random(SIZE);
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P.Y := Random(SIZE);
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end
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else if PByteArray(B.ScanLine[P.Y])^[P.X] <> 0 then
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begin
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PByteArray(B.ScanLine[P.Y-D.Y])^[P.X-D.X] := $FF;
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Break;
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end;
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end;
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end;
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Canvas.Draw(0, 0, B);
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finally
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FreeAndNil(B);
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end;
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end;
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