再学 GDI+[2]: DrawLine - 绘制直线[转]

unit Unit1;

 

interface

 

uses

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

  Dialogs;

 

type

  TForm1 = class(TForm)

    procedure FormPaint(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

 

var

  Form1: TForm1;

 

implementation

 

{$R *.dfm}

uses

  GDIPAPI,GDIPOBJ;

procedure TForm1.FormPaint(Sender: TObject);

var

  g:TGPGraphics;

  p:TGPPen;

begin

  g:=TGPGraphics.Create(Canvas.Handle);

  g.Clear(aclWhite);

  p:=TGPPen.Create(aclRed,2);

 

  g.DrawLine(p,20, 40, 200, 40);

  g.DrawLine(p,MakePoint(20,60), MakePoint(200,60));  {参数是点(整数)}

  g.DrawLine(p,20.9, 80.0, 200.9, 80.0);       {参数是小数}

  g.DrawLine(p,MakePoint(20.9, 100.0), MakePoint(200.9, 100.0)); {参数是点(小数)}

 

  p.Free;

  g.Free;

end;

 

end.