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Frequently Asked Questions

Fast way to clear a given canvas

Question:

What is the fastest way to clear a given canvas?

Answer:

Use the Windows API function PatBlt().

Example:

procedure TForm1.Button1Click(Sender: TObject);
begin
  PatBlt(Form1.Canvas.Handle,
         0,
         0,
         Form1.ClientWidth,
         Form1.ClientHeight,
         WHITENESS);
end;

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