upolypolyline.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 UPolyPolyLine;

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..11] of TPoint; // the vertices defining the polygons
  NPoints: array[0..1] of Integer;     // the number of vertices in each polygon
begin
  {define the polygons -}
  {first polygon}
  PointsArray[0].X := 50;
  PointsArray[0].y := 50;
  PointsArray[1].x := 100;
  PointsArray[1].y := 50;
  PointsArray[2].x := 125;
  PointsArray[2].y := 75;
  PointsArray[3].x := 100;
  PointsArray[3].y := 100;
  PointsArray[4].x := 50;
  PointsArray[4].y := 100;
  PointsArray[5].x := 25;
  PointsArray[5].y := 75;
  PointsArray[6].X := 50;
  PointsArray[6].Y := 50;
  {second polygon}
  PointsArray[7].X := 200;
  PointsArray[7].y := 25;
  PointsArray[8].X := 300;
  PointsArray[8].Y := 25;
  PointsArray[9].X := 300;
  PointsArray[9].Y := 125;
  PointsArray[10].X := 200;
  PointsArray[10].Y := 125;
  PointsArray[11].X := 200;
  PointsArray[11].Y := 25;

  {indicate how many vertices are in each polygon}
  NPoints[0] := 7;
  NPoints[1] := 5;

  {draw the unfilled polygons}
  PolyPolyLine(Canvas.Handle, PointsArray, NPoints, 2);
end;
end.