C# Winform中如何绘制动画示例详解

using System;  
using System.Collections.Generic;  
using System.Text;  
using System.Drawing;  
using System.Drawing.Imaging;  
 
namespace GifTest  
{  
  /// <summary>  
  /// 表示一类带动画功能的图像。  
  /// </summary>  
  public class AnimateImage  
  {  
    Image image;  
    FrameDimension frameDimension;  
    /// <summary>  
    /// 动画当前帧发生改变时触发。  
    /// </summary>  
    public event EventHandler<EventArgs> OnFrameChanged;  
 
    /// <summary>  
    /// 实例化一个AnimateImage。  
    /// </summary>  
    /// <param name="img">动画图片。</param>  
    public AnimateImage(Image img)  
    {  
      image = img;  
 
      lock (image)  
      {  
        mCanAnimate = ImageAnimator.CanAnimate(image);  
        if (mCanAnimate)  
        {  
          Guid[] guid = image.FrameDimensionsList;  
          frameDimension = new FrameDimension(guid[0]);  
          mFrameCount = image.GetFrameCount(frameDimension);  
        }  
      }  
    }  
 
    bool mCanAnimate;  
    int mFrameCount = 1, mCurrentFrame = 0;  
 
    /// <summary>  
    /// 图片。  
    /// </summary>  
    public Image Image  
    {  
      get { return image; }  
    }  
 
    /// <summary>  
    /// 是否动画。  
    /// </summary>  
    public bool CanAnimate  
    {  
      get { return mCanAnimate; }  
    }  
 
    /// <summary>  
    /// 总帧数。  
    /// </summary>  
    public int FrameCount  
    {  
      get { return mFrameCount; }  
    }  
 
    /// <summary>  
    /// 播放的当前帧。  
    /// </summary>  
    public int CurrentFrame  
    {  
      get { return mCurrentFrame; }  
    }  
 
    /// <summary>  
    /// 播放这个动画。  
    /// </summary>  
    public void Play()  
    {  
      if (mCanAnimate)  
      {  
        lock (image)  
        {  
          ImageAnimator.Animate(image, new EventHandler(FrameChanged));  
        }  
      }  
    }  
 
    /// <summary>  
    /// 停止播放。  
    /// </summary>  
    public void Stop()  
    {  
      if (mCanAnimate)  
      {  
        lock (image)  
        {  
          ImageAnimator.StopAnimate(image, new EventHandler(FrameChanged));  
        }  
      }  
    }  
 
    /// <summary>  
    /// 重置动画，使之停止在第0帧位置上。  
    /// </summary>  
    public void Reset()  
    {  
      if (mCanAnimate)  
      {  
        ImageAnimator.StopAnimate(image, new EventHandler(FrameChanged));  
        lock (image)  
        {  
          image.SelectActiveFrame(frameDimension, 0);  
          mCurrentFrame = 0;  
        }  
      }  
    }  
 
    private void FrameChanged(object sender, EventArgs e)  
    {  
      mCurrentFrame = mCurrentFrame + 1 >= mFrameCount ? 0 : mCurrentFrame + 1;  
      lock (image)  
      {  
        image.SelectActiveFrame(frameDimension, mCurrentFrame);  
      }  
      if (OnFrameChanged != null)  
      {  
        OnFrameChanged(image, e);  
      }  
    }  
  }  
}

using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Drawing.Imaging;  
using System.Text;  
using System.Windows.Forms;  
 
namespace GifTest  
{  
  public partial class Form1 : Form  
  {  
    AnimateImage image;  
 
    public Form1()  
    {  
      InitializeComponent();  
      image = new AnimateImage(Image.FromFile(@"C:\Documents and Settings\Administrator\My Documents\My Pictures\未命名.gif"));  
      image.OnFrameChanged += new EventHandler<EventArgs>(image_OnFrameChanged);  
      SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);  
    }  
 
    void image_OnFrameChanged(object sender, EventArgs e)  
    {  
      Invalidate();  
    }  
 
    private void Form1_Load(object sender, EventArgs e)  
    {  
      image.Play();  
    }  
 
    private void Form1_Paint(object sender, PaintEventArgs e)  
    {  
      lock (image.Image)  
      {  
        e.Graphics.DrawImage(image.Image, new Point(0, 0));  
      }  
    }  
 
    private void button1_Click(object sender, EventArgs e)  
    {  
      if (button1.Text.Equals("Stop"))  
      {  
        image.Stop();  
        button1.Text = "Play";  
      }  
      else 
      {  
        image.Play();  
        button1.Text = "Stop";  
      }  
      Invalidate();  
    }  
 
    private void button2_Click(object sender, EventArgs e)  
    {  
      image.Reset();  
      button1.Text = "Play";  
      Invalidate();  
    }  
  }  
}