再學 GDI+[85]: TGPImage(5) - RotateFlip - 旋轉與鏡像

本例效果圖:

　　代碼文件: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:temptest.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.窗體文件: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
endTRotateFlipType 枚舉的常數值:RotateNoneFlipNone = 0;
Rotate90FlipNone　 = 1;
Rotate180FlipNone　= 2;
Rotate270FlipNone　= 3;
RotateNoneFlipX　　= 4;
Rotate90FlipX　　　= 5;
Rotate180FlipX　　 = 6;
Rotate270FlipX　　 = 7;