C#如何实现loading提示控件简单的实例

自己画一个转圈圈的控件

using System;
    using System.Collections.Generic;
    using System.componentModel;
    using System.Data;
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
namespace ExerciseUIPRj.controls{
  public partial class LoadControl : Control  {
        Color beginColor = Color.Blue;
        Color endColor = Color.red;
        int wid = 10;
        int curindex = 0;
        Timer timer;
        int instervel = 200;
        string loadStr = "loading....";
    public LoadControl()    {
          InITializeComponent();
          SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint|ControlStyles.OptimizedDoubleBuffer, true);
          this.MinimumSize = new Size(40, 80);
      if (!DesignMode)      {
            Start();
      }
    }
    public void Start()    {
      if (timer == null)      {
            timer = new Timer();
            timer.Interval = instervel;
            timer.Tick += Timer_Tick;
      }
          timer.Enabled = true;
    }
    public void Stop()    {
      if (timer != null)      {
            timer.Enabled = false;
      }
    }
    void Timer_Tick(object sender, Eventargs e)    {
          curindex++;
          curindex = curindex >
    = wid ? 0 : curindex;
          Refresh();
    }
    //计算各种圈圈相关    Point getPoint(double d, double r, Point center)    {
          int x = (int)(r * Math.Cos(d * Math.PI / 180.0));
          int y = (int)(r * Math.Sin(d * Math.PI / 180.0));
          return new Point(center.X + x, center.Y - y);
    }
    GraphicsPath getPath(Point a, Point b)    {
          Point c, d, e, f;
          int h = 2;
          Vertical(a, b, h, out c, out d);
          Vertical(b, a, h, out e, out f);
          GraphicsPath path = new GraphicsPath();
      path.AddPolygon(new Point[] {
 c, d, e, f }
    );
          path.CloseAllFigures();
          return path;
    }
    bool Vertical(Point pointa, Point pointb, double R, out Point pointc, out Point pointd)    {
          pointc = new Point();
          pointd = new Point();
      try      {
            //（X-xa)^2+(Y-ya)^2=R*R  距离公式        //(X-xa)*(xb-xa)+(Y-ya)*(yb-ya)=0  垂直        //解方程得两点即为所求点        VAR cx = pointa.X - (pointb.Y - pointa.Y) * R / Distance(pointa, pointb);
            var cy = pointa.Y + (pointb.X - pointa.X) * R / Distance(pointa, pointb);
            var dx = pointa.X + (pointb.Y - pointa.Y) * R / Distance(pointa, pointb);
            var dy = pointa.Y - (pointb.X - pointa.X) * R / Distance(pointa, pointb);
            pointc = new Point((int)cx, (int)cy);
            pointd = new Point((int)dx, (int)dy);
            return true;
      }
      catch      {
            //如果A,B两点重合会报错，那样就返回false        return false;
      }
    }
    double Distance(double xa, double ya, double xb, double yb)    {
          double L;
          L = Math.Sqrt(Math.Pow(xa - xb, 2) + Math.Pow(ya - yb, 2));
          return L;
    }
    double Distance(Point pa, Point pb)    {
          return Distance(pa.X, pa.Y, pb.X, pb.Y);
    }
    GraphicsPath getPath(double d, double r, Point c)    {
          var p1 = getPoint(d, r / 2.0, c);
          var p2 = getPoint(d, r, c);
          return getPath(p1, p2);
    }
    //算渐变色    Color[] getColors()    {
          int dr = (int)((endColor.R - beginColor.R) / (double)wid);
          int dg = (int)((endColor.G - beginColor.G) / (double)wid);
          int db = (int)((endColor.B - beginColor.B) / (double)wid);
          ListColor>
     colors = new ListColor>
    ();
          for (int i = 0;
     i  wid;
 i++)      {
            colors.Add(Color.FromArgb(beginColor.R + dr * i, beginColor.G + dg * i, beginColor.B + db * i));
      }
          return colors.ToArray();
    }
    //画圈圈    void drawRect(Graphics g)    {
          int r = (int)(Size.Height / 2.0);
          Point center = new Point(r, r);
          var colors = getColors();
          int findex = curindex;
          for (int i = 0;
     i  wid;
 i++)      {
            double d = (360.0 / wid) * i;
            var p = getPath(d, r, center);
            int cindex = findex + i;
            cindex = cindex >
    = wid ? cindex - wid : cindex;
            g.FillPath(new Solidbrush(colors[cindex]), p);
      }
    }
    //画字符串    void drawString(Graphics g)    {
          if (Size.Height >
    = Size.Width) return;
          Rectangle rect = new Rectangle(new Point(Size.Height, 0), new Size(Size.Width - Size.Height, Size.Height));
          StringFormat sf = new StringFormat();
          sf.Alignment = StringAlignment.Center;
          sf.LineAlignment = StringAlignment.Center;
          g.DrawString(loadStr, Font, Brushes.Black, rect,sf);
    }
    protected override void OnPaint(PaintEventArgs PE)    {
          base.OnPaint(pe);
          Graphics g = pe.Graphics;
          g.SmoothingMode = SmoothingMode.HighQuality;
          g.PixelOffsetMode = PixelOffsetMode.HighQuality;
          drawRect(g);
          drawString(g);
    }
    protected override void OnSizeChanged(EventArgs e)    {
          base.OnSizeChanged(e);
          if (Size.Height >
 Size.Width)      {
            Size = new Size(Size.Height, Size.Height);
      }
    }
  }
}
    

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