TCanvasArcTo (Delphi)

Description

The following example exercises TCanvas.ArcTo and illustrates graphically how the parameters are used in the construction of the arc section.

Code

procedure TForm1.Button1Click(Sender: TObject);
var
  CenterX, CenterY: Integer;
  X1, Y1, X2, Y2, X3, Y3, X4, Y4 : Integer;
begin
  X1:= StrToInt(Edit1.Text);
  Y1:= StrToInt(Edit2.Text);
  X2:= StrToInt(Edit3.Text);
  Y2:= StrToInt(Edit4.Text);
  X3:= StrToInt(Edit5.Text);
  Y3:= StrToInt(Edit6.Text);
  X4:= StrToInt(Edit7.Text);
  Y4:= StrToInt(Edit8.Text);

  Repaint;
  Canvas.Pen.Color := clDefault;
  Canvas.MoveTo(X1, Y1);
  Canvas.LineTo(X2, Y1);
  Canvas.LineTo(X2, Y2);
  Canvas.LineTo(X1, Y2);
  Canvas.LineTo(X1, Y1);
  CenterX := (X1 + X2) div 2;
  Centery := (Y1 + Y2) div 2;
  Canvas.MoveTo(CenterX, CenterY);
  Canvas.LineTo(X3, Y3);
  Canvas.MoveTo(CenterX, CenterY);
  Canvas.LineTo(X4, Y4);

  Canvas.MoveTo(CenterX, CenterY);
  Canvas.Pen.Color := clRed;
  Canvas.ArcTo(X1, Y1, X2, Y2, X3, Y3, X4, Y4);
end;

Uses

• Vcl.Graphics.TCanvas.ArcTo ( fr | de | ja )
• Vcl.Graphics.TCanvas.Pen ( fr | de | ja )
• Vcl.Graphics.TColor ( fr | de | ja )
• Vcl.Graphics.TPen ( fr | de | ja )