upolylineto.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 UPolyLineTo;

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
  PointsArray: array[0..5] of TPoint; // the points defining the polygon
begin
  {move the current position to where the polygon will start}
  MoveToEx(Canvas.Handle, 50, 50, nil);

  {define the polygon}
  PointsArray[0].x := 100;
  PointsArray[0].y := 50;
  PointsArray[1].x := 125;
  PointsArray[1].y := 75;
  PointsArray[2].x := 100;
  PointsArray[2].y := 100;
  PointsArray[3].x := 50;
  PointsArray[3].y := 100;
  PointsArray[4].x := 25;
  PointsArray[4].y := 75;
  PointsArray[5].X := 50;
  PointsArray[5].Y := 50;

  {draw the polygon, starting at the current position}
  PolyLineTo(Canvas.Handle, PointsArray, 6);
end;

end.