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再学GDI+[40]: 文本输出 - 选择画刷

时间:2012-05-14 | 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, CheckLst;
type
 TForm1 = class(TForm)
  RadioGroup1: TRadioGroup;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure RadioGroup1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ,GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 RadioGroup1.Caption := '选择画刷';
 RadioGroup1.Items.CommaText := '实心画刷,阴影画刷,纹理画刷,渐变画刷';
 RadioGroup1.ItemIndex := 0;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 font: TGPFont;
 img: TGPImage;
 b: TGPBrush;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 img := TGPImage.Create('c:\temp\small.jpg'); {文件要存在}
 case RadioGroup1.ItemIndex of
  0: b := TGPSolidBrush.Create(aclRed);
  1: b := TGPHatchBrush.Create(HatchStyleCross, aclSilver, aclRed);
  2: b := TGPTextureBrush.Create(img);
  3: b := TGPLinearGradientBrush.Create(
     MakePoint(0,0),
     MakePoint(ClientWidth - RadioGroup1.Width, ClientHeight),
     aclYellow,
     aclRed
    );
 end;
 font := TGPFont.Create('Arial Black', 60, FontStyleBold);
 g.DrawString('Delphi', -1, font, MakePoint(0.0,0), b);
 img.Free;
 b.Free;
 font.Free;
 g.Free;
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
begin
 Repaint;
end;
end.

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