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)
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 := '制作畫筆的畫刷';
RadioGroup1.Items.CommaText := '實心畫刷,陰影畫刷,紋理畫刷,漸變畫刷';
RadioGroup1.ItemIndex := 0;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
g: TGPGraphics;
p: TGPPen;
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(HatchStyleSolidDiamond, aclYellow, aclCornflowerBlue);
2: b := TGPTextureBrush.Create(img);
3: b := TGPLinearGradientBrush.Create(
MakePoint(0,0),
MakePoint(ClientWidth - RadioGroup1.Width, ClientHeight),
aclYellow,
aclRed
);
end;
p := TGPPen.Create(b, 24);
g.DrawEllipse(p, 30, 30, ClientWidth-RadioGroup1.Width-60, ClientHeight-60);
g.DrawLine(p, 0, 0, ClientWidth-RadioGroup1.Width, ClientHeight);
img.Free;
b.Free;
p.Free;
g.Free;
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
begin
Repaint;
end;
end.
窗體文件:object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 206
ClientWidth = 339
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
Position = poDesktopCenter
OnCreate = FormCreate
OnPaint = FormPaint
PixelsPerInch = 96
TextHeight = 13
object RadioGroup1: TRadioGroup
Left = 248
Top = 0
Width = 91
Height = 206
Align = alRight
Caption = 'RadioGroup1'
TabOrder = 0
OnClick = RadioGroup1Click
end
end
