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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[30]: TGPPen - 用畫刷定義的畫筆

再學GDI+[30]: TGPPen - 用畫刷定義的畫筆

編輯:Delphi

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

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