C# 簡單的loading提示控制項

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自己畫一個轉圈圈的控制項

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();        }        //計算各種圈圈相關        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    距離公式                //(X-xa)*(xb-xa)+(Y-ya)*(yb-ya)=0   垂直                //解方程得兩點即為所求點                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兩點重合會報錯，那樣就返回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);        }        //算漸層色        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();        }        //畫圈圈        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);                            }        }        //畫字串        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);            }        }    }}

 

C# 簡單的loading提示控制項