本文通过实例代码给大家介绍了c#实现简单的loading提示控件功能，代码非常简单，具有参考借鉴价值，需要的朋友参考下吧
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 colors = new List(); for (int i = 0; i = 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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