c#自定義進度條

有些時候我們做的程序需要進度條，而vs提供的控件不是我們想要的。先看效果圖：

      進度條閃爍動畫，當然背景可設為Transparent

之前想手繪進度條線條的，結果控件運行時會閃爍，所以直接用了panel控件

源碼：

    [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("單擊時X的坐標")]
        public int LocationX
        {
            get { return locationX; }
        }
   
        private int current = 0;
        [Description("當前進度")]
        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("點下鼠標")]
        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, 給我們的位圖路徑計算使用   
            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;         // 記錄左上角0，0座標的顏色值  
            p0 = p[0];
            p1 = p[1];
            p2 = p[2];

            int start = -1;
            // 行座標 ( Y col )   
            for (int Y = 0; Y < height; Y++)
            {
                // 列座標 ( X row )   
                for (int X = 0; X < width; X++)
                {
                    if (start == -1 && (p[0] != p0 || p[1] != p1 || p[2] != p2))     //如果 之前的點沒有不透明 且 不透明   
                    {
                        start = X;                            //記錄這個點  
                    }
                    else if (start > -1 && (p[0] == p0 && p[1] == p1 && p[2] == p2))      //如果 之前的點是不透明 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 之前的點是不透明 且 是最后一個點  
                    {
                        g.AddRectangle(new Rectangle(start, Y, X - start + 1, 1));      //添加之前的矩形到  
                        start = -1;
                    }
                    p += 3;                                   //下一個內存地址  
                }
                p += offset;
            } bitmap.UnlockBits(bmData);
            bitmap.Dispose();
            // 返回計算出來的不透明圖片路徑   
            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： 

直接右鍵另存為圖片，之所以用黑色背景是因為圖片是白色的看不見，不用多說了。

提示：這里用到了unsafe關鍵字，需要設置項目的屬性-----允許運行不安全的代碼，沒有設置的同學不要以為程序錯了