C#自定义音乐播放器进度条

[DefaultEvent("ProgressClick")]  [ToolboxBitmap(typeof(TrackBar))]  public partial class ProcessBar : UserControl  {    public ProcessBar()    {      //InitializeComponent();      //this.SetStyle(ControlStyles.UserPaint, true);      //this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);      //this.SetStyle(ControlStyles.DoubleBuffer, true);    }    private int locationX=0;    [Description("单击时X的坐标")]    public int LocationX    {      get { return locationX; }    }      private int current = 0;    [Description("当前进度")]    public int Current    {      get { return current; }      set      {        if (value > 232 || value < 0)          return;        current = value;        panelCurrent.Size = new Size(value, 1);        picture.Location = new Point(value - 4, -3);        Invalidate();      }    }    private bool isPlay = false;    [Description("是否播放")]    public bool IsPlay    {      get { return isPlay; }      set { isPlay = value; tmrCurrent.Enabled = isPlay; Invalidate(); }    }    public delegate void MouseHandle(object sender,EventArgs e);    [Description("点下鼠标")]    public event MouseHandle BarMouseDown;    int picturetype = 0;    private void tmrCurrent_Tick(object sender, EventArgs e)    {      if (picturetype == 0)      { picture.Image = Properties.Resources.play_slider_thumb; picturetype = 1; }      else      { picture.Image = Properties.Resources.play_slider_thumb_animate; picturetype = 0; }      GraphicsPath g = subGraphicsPath(picture.Image);      if (g == null) return;      picture.Region = new Region(g);    }    private unsafe static GraphicsPath subGraphicsPath(Image img)    {      if (img == null) return null;      // 建立GraphicsPath, 给我们的位图路径计算使用        GraphicsPath g = new GraphicsPath(FillMode.Alternate);      Bitmap bitmap = new Bitmap(img);      int width = bitmap.Width;      int height = bitmap.Height;      BitmapData bmData = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);      byte* p = (byte*)bmData.Scan0;      int offset = bmData.Stride - width * 3;      int p0, p1, p2;     // 记录左上角0，0座标的颜色值       p0 = p[0];      p1 = p[1];      p2 = p[2];      int start = -1;      // 行座标 ( Y col )        for (int Y = 0; Y < height; Y++)      {        // 列座标 ( X row )          for (int X = 0; X < width; X++)        {          if (start == -1 && (p[0] != p0 || p[1] != p1 || p[2] != p2))   //如果 之前的点没有不透明 且 不透明            {            start = X;              //记录这个点           }          else if (start > -1 && (p[0] == p0 && p[1] == p1 && p[2] == p2))   //如果 之前的点是不透明 且 透明           {            g.AddRectangle(new Rectangle(start, Y, X - start, 1));  //添加之前的矩形到             start = -1;          }          if (X == width - 1 && start > -1)    //如果 之前的点是不透明 且 是最后一个点           {            g.AddRectangle(new Rectangle(start, Y, X - start + 1, 1));   //添加之前的矩形到             start = -1;          }          p += 3;                  //下一个内存地址         }        p += offset;      } bitmap.UnlockBits(bmData);      bitmap.Dispose();      // 返回计算出来的不透明图片路径        return g;    }    private void panelTotal_MouseDown(object sender, MouseEventArgs e)    {      Current = e.Location.X;      locationX = e.Location.X;      if (BarMouseDown != null)      {        BarMouseDown.Invoke(sender, e);      }    }    private void panelCurrent_MouseDown(object sender, MouseEventArgs e)    {      Current = e.Location.X;      locationX = e.Location.X;      if (BarMouseDown != null)      {        BarMouseDown.Invoke(sender, e);      }    }  }