C#自定义音乐播放器进度条

有些时候我们做的程序需要进度条，而vs提供的控件不是我们想要的。先看效果图：

进度条闪烁动画，当然背景可设为transparent

之前想手绘进度条线条的，结果控件运行时会闪烁，所以直接用了panel控件

源码：

[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);
      }
    }
  }

用到的素材：

直接右键另存为图片，之所以用黑色背景是因为图片是白色的看不见，不用多说了。

提示：这里用到了unsafe关键字，需要设置项目的属性-----允许运行不安全的代码，没有设置的同学不要以为程序错了