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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[103]: TGPImage(23) - 提取 GIF 動畫的每一幀

再學GDI+[103]: TGPImage(23) - 提取 GIF 動畫的每一幀

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)
  Button1: TButton;
  ListBox1: TListBox;
  OpenDialog1: TOpenDialog;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure Button1Click(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ListBox1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 img: TGPImage;
 GifFrame, GifFrameCount: Word;
procedure TForm1.FormCreate(Sender: TObject);
begin
 OpenDialog1.Filter := 'GIF 文件|*.gif';
 img := TGPImage.Create;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 img.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
 DimensionsCount: Integer;
 DimensionsIDs: PGUID;
 i: Integer;
type
 ArrDimensions = array of TGUID;
begin
 if not OpenDialog1.Execute then Exit;
 img.Free;
 img := TGPImage.Create(OpenDialog1.FileName);
 {獲取 Gif 總幀數}
 DimensionsCount := img.GetFrameDimensionsCount;
 GetMem(DimensionsIDs, DimensionsCount * SizeOf(TGUID));
 img.GetFrameDimensionsList(DimensionsIDs, DimensionsCount);
 GifFrameCount := img.GetFrameCount(ArrDimensions(DimensionsIDs)[0]);
 FreeMem(DimensionsIDs);
 Text := Format('共有 %d 幀', [GifFrameCount]);
 {顯示幀列表}
 ListBox1.Clear;
 for i := 1 to GifFrameCount do
  ListBox1.Items.Add(Format('第 %d 幀', [i]));
 Repaint;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 g.DrawImage(img, ListBox1.Width + 10, 10, img.GetWidth, img.GetHeight);
 g.Free;
end;
procedure TForm1.ListBox1Click(Sender: TObject);
begin
 GifFrame := ListBox1.ItemIndex;
 img.SelectActiveFrame(FrameDimensionTime, GifFrame);
 Repaint;
end;
end.

窗體文件:

object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 206
 ClientWidth = 339
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 OnCreate = FormCreate
 OnDestroy = FormDestroy
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object ListBox1: TListBox
  Left = 0
  Top = 0
  Width = 89
  Height = 206
  Align = alLeft
  ItemHeight = 13
  TabOrder = 0
  OnClick = ListBox1Click
 end
 object Button1: TButton
  Left = 256
  Top = 173
  Width = 75
  Height = 25
  Caption = 'Button1'
  TabOrder = 1
  OnClick = Button1Click
 end
 object OpenDialog1: TOpenDialog
  Left = 160
  Top = 104
 end
end

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