upolybezierto.pas

DelphiWin32核心API参考光盘内容.是学习书籍中的源码,便于学习.

unit UPolyBezierTo;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    procedure FormPaint(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormPaint(Sender: TObject);
var
  Points: array[0..2] of TPoint;  // the points defining the bezier curve
begin
  {define the bezier curve}
  Points[0].X := 40;
  Points[0].Y := 110;
  Points[1].X := 80;
  Points[1].Y := 30;
  Points[2].X := 110;
  Points[2].Y := 70;

  {move the current position to the correct starting point}
  MoveToEx(Canvas.Handle, 10, 70, NIL);

  {draw the bezier curve}
  PolyBezierTo(Canvas.Handle, Points, 3);

  {the current position was updated, so we can use this to continue
   drawing an image}
  LineTo(Canvas.Handle, 110, 10);
  LineTo(Canvas.Handle, 10, 10);
  LineTo(Canvas.Handle, 10, 70);
end;

end.