本例效果圖:
代碼文件: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.
