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:

---

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:

---

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