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再学GDI+[32]: TGPPen - 拐角长度的限制 - SetMiterLimit

时间:2012-05-05 | 栏目:Delphi教程 | 点击:

拐角长度的限制的默认值是 10.0, 一般足够用了.

本例效果图:

代码文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ComCtrls;
type
 TForm1 = class(TForm)
  TrackBar1: TTrackBar;
  procedure FormPaint(Sender: TObject);
  procedure ListBox1Click(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure FormCreate(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 TrackBar1.ShowSelRange := False;
 TrackBar1.Height := 20;
 TrackBar1.Min := 0;
 TrackBar1.Max := 100;
 TrackBar1.Position := TrackBar1.Max;
end;
procedure TForm1.FormPaint(Sender: TObject);
const
 PtArr: array[0..2] of TGPPoint = ((X:90;Y:80), (X:240;Y:30), (X:240;Y:80));
var
 g: TGPGraphics;
 p: TGPPen;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclSeaGreen, 28);
 p.SetMiterLimit(TrackBar1.Position / 10);
 g.DrawPolygon(p, PGPPoint(@PtArr), Length(PtArr));
 p.Free;
 g.Free;
end;
procedure TForm1.ListBox1Click(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
end;
end.

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