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再学GDI+[27]: TGPPen - 画笔样式 - SetDashStyle

时间:2012-05-05 | 栏目:Delphi教程 | 点击:

本例效果图:

代码文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  ComboBox1: TComboBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ComboBox1Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, TypInfo;
procedure TForm1.FormCreate(Sender: TObject);
var
 i: Integer;
begin
 for i := 0 to 5 do
  ComboBox1.Items.Add(GetEnumName(TypeInfo(TDashStyle), i));
 ComboBox1.ItemIndex := 0;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 g.Clear($FFFFFFFF);
 p := TGPPen.Create(aclLimeGreen, 10);
 p.SetDashStyle(TDashStyle(ComboBox1.ItemIndex));
 g.DrawLine(p, 0, 0, ClientWidth, ClientHeight);
 p.Free;
 g.Free;
end;
procedure TForm1.ComboBox1Change(Sender: TObject);
begin
 Repaint;
end;
end.

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