再学 GDI+[40]: 文本输出 - 选择画刷

本例效果图:

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代码文件:

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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.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 120

  ClientWidth = 399

  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 = 308

    Top = 0

    Width = 91

    Height = 120

    Align = alRight

    Caption = 'RadioGroup1'

    TabOrder = 0

    OnClick = RadioGroup1Click

    ExplicitLeft = 248

    ExplicitHeight = 206

  end

end