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procedure TForm1.Button2Click(Sender: TObject);
begin
image1.Canvas.Pen.Color := clblack;
image1.Canvas.Brush.Color := clblack;
image1.Canvas.Rectangle(0, 0, image1.Width, image1.Height);
end;
procedure TForm1.Button3Click(Sender: TObject);
var
i:integer;
begin
// for i:=0 to 10000 do
begin
// Button2Click(self);
image1.Canvas.Pen.Color := clred;
image1.Canvas.MoveTo(20,20);
image1.Canvas.LineTo(100,100);
// end;
end;
Form1.DoubleBuffered := True;