Delphi 的绘图功能[6] - Polygon、Polyline

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    procedure FormCreate(Sender: TObject);

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormCreate(Sender: TObject);

begin

  Canvas.Pen.Width := 2;

  Canvas.Pen.Color := clRed;

  Canvas.Brush.Color := clYellow;

end;



{绘制多边形; 它的参数是一个点数组, 这里定义了一个常数数组}

procedure TForm1.Button1Click(Sender: TObject);

const

  pts: array[0..3] of TPoint = (

    (x:10; y:40),

    (x:46; y:120),

    (x:82; y:40),

    (x:46; y:10)

  );

begin

  Canvas.Polygon(pts);

end;



{绘制连续的一组直线; 它的参数也是一个点数组, 我只是把上面的平移了一点}

procedure TForm1.Button2Click(Sender: TObject);

const

  pts: array[0..3] of TPoint = (

    (x:10+82; y:40),

    (x:46+82; y:120),

    (x:82+82; y:40),

    (x:46+82; y:10)

  );

begin

  Canvas.Polyline(pts);

end;



end.


 
   




//效果图:

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