再学 GDI+[85]: TGPImage(5) - RotateFlip - 旋转与镜像

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;



type

  TForm1 = class(TForm)

    ListBox1: TListBox;

    procedure FormCreate(Sender: TObject);

    procedure FormPaint(Sender: TObject);

    procedure ListBox1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses GDIPOBJ, GDIPAPI;



procedure TForm1.FormCreate(Sender: TObject);

begin

  ListBox1.Align := alRight;

  with ListBox1.Items do

  begin

    Add('RotateNoneFlipNone');

    Add('Rotate90FlipNone');

    Add('Rotate180FlipNone');

    Add('Rotate270FlipNone');

    Add('RotateNoneFlipX');

    Add('Rotate90FlipX');

    Add('Rotate180FlipX');

    Add('Rotate270FlipX');

  end;

end;



procedure TForm1.FormPaint(Sender: TObject);

var

  g: TGPGraphics;

  img: TGPImage;

begin

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

  img := TGPImage.Create('C:\temp\test.jpg');



  img.RotateFlip(TRotateFlipType(ListBox1.ItemIndex));

  g.DrawImage(img, 4, 4, img.GetWidth, img.GetHeight);



  img.Free;

  g.Free;

end;



procedure TForm1.ListBox1Click(Sender: TObject);

begin

  Repaint;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 245

  ClientWidth = 361

  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 ListBox1: TListBox

    Left = 248

    Top = 40

    Width = 111

    Height = 97

    ItemHeight = 13

    TabOrder = 0

    OnClick = ListBox1Click

  end

end


 
   

TRotateFlipType 枚举的常数值:

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RotateNoneFlipNone = 0;

Rotate90FlipNone   = 1;

Rotate180FlipNone  = 2;

Rotate270FlipNone  = 3;

RotateNoneFlipX    = 4;

Rotate90FlipX      = 5;

Rotate180FlipX     = 6;

Rotate270FlipX     = 7;