再学 GDI+[20]: TGPTextureBrush 与 TWrapMode

TGPTextureBrush.Create(

  image: TGPImage;                   {用于画刷的图像}

  wrapMode: TWrapMode = WrapModeTile {平铺样式, 是可选值, 见下表}

);


 
   

本例效果图:

---

代码文件:

---

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    ComboBox1: TComboBox;

    procedure FormCreate(Sender: TObject);

    procedure FormPaint(Sender: TObject);

    procedure ComboBox1Change(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses GDIPOBJ, GDIPAPI, TypInfo;



procedure TForm1.FormCreate(Sender: TObject);

var

  i: Integer;

begin

  for i := 0 to 4 do

    ComboBox1.Items.Add(GetEnumName(TypeInfo(TWrapMode), i));

  ComboBox1.ItemIndex := 0;

end;



procedure TForm1.FormPaint(Sender: TObject);

var

  g: TGPGraphics;

  r: TGPRect;

  img: TGPImage;

  tb: TGPTextureBrush;

begin

  g := TGPGraphics.Create(Canvas.Handle);

  r := MakeRect(ClientRect);



  img := TGPImage.Create('c:\temp\cat.png');

  tb := TGPTextureBrush.Create(img);



  tb.SetWrapMode(TWrapMode(ComboBox1.ItemIndex));

  g.FillRectangle(tb, r);



  img.Free;

  tb.Free;

  g.Free;

end;



procedure TForm1.ComboBox1Change(Sender: TObject);

begin

  Repaint;

end;



end.


 
   

窗体文件:

---

object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 263

  ClientWidth = 352

  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 ComboBox1: TComboBox

    Left = 242

    Top = 2

    Width = 107

    Height = 21

    ItemHeight = 13

    TabOrder = 0

    Text = 'ComboBox1'

    OnChange = ComboBox1Change

  end

end


 
   

WrapMode 选项:

Delphi	微软	说明
WrapModeTile	Tile	平铺渐变或纹理。
WrapModeTileFlipX	TileFlipX	水平反转纹理或渐变，然后平铺该纹理或渐变。
WrapModeTileFlipY	TileFlipY	垂直反转纹理或渐变，然后平铺该纹理或渐变。
WrapModeTileFlipXY	TileFlipXY	水平和垂直反转纹理或渐变，然后平铺该纹理或渐变。
WrapModeClamp	Clamp	纹理或渐变没有平铺。

---