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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[85]: TGPImage(5) - RotateFlip - 旋轉與鏡像

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

編輯:Delphi

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:\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
end
TRotateFlipType 枚舉的常數值:RotateNoneFlipNone = 0;
Rotate90FlipNone  = 1;
Rotate180FlipNone = 2;
Rotate270FlipNone = 3;
RotateNoneFlipX  = 4;
Rotate90FlipX   = 5;
Rotate180FlipX   = 6;
Rotate270FlipX   = 7;

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