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);        List<Color> colors = new List<Color>();        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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