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前提

入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。

GitHub：

码云：

如果觉得写的还行，请点个 star 支持一下吧

欢迎前来交流探讨：企鹅群568015492

麻烦博客下方点个【推荐】，谢谢

NuGet

Install-Package HZH_Controls

用处及效果

准备工作

依然使用GDI+画的，不懂的话就百度一下吧

另外主要用到了三角函数，如果不懂，可以向初中的数学老师再问问（你也可以百度一下）

开始

添加一个类UCMeter 继承 UserControl

首先添加一个需要控制的属性

1 private int splitCount = 10;  2         ///   3         /// Gets or sets the split count.  4         /// 
  5         /// 
    
     The split count.
      6         [Description("分隔刻度数量，>1"), Category("自定义")]  7         public int SplitCount  8         {  9             get { return splitCount; } 10             set 11             { 12                 if (value < 1) 13                     return; 14                 splitCount = value; 15                 Refresh(); 16             } 17         } 18  19         private int meterDegrees = 150; 20         ///  21         /// Gets or sets the meter degrees. 22         /// 
 23         /// 
    
     The meter degrees.
     24         [Description("表盘跨度角度，0-360"), Category("自定义")] 25         public int MeterDegrees 26         { 27             get { return meterDegrees; } 28             set 29             { 30                 if (value > 360 || value <= 0) 31                     return; 32                 meterDegrees = value; 33                 Refresh(); 34             } 35         } 36  37         private decimal minValue = 0; 38         ///  39         /// Gets or sets the minimum value. 40         /// 
 41         /// 
    
     The minimum value.
     42         [Description("最小值,
    
     = maxValue) 49                     return; 50                 minValue = value; 51                 Refresh(); 52             } 53         } 54  55         private decimal maxValue = 100; 56         /// 
      57         /// Gets or sets the maximum value. 58         /// 
 59         /// 
     
      The maximum value.
      60         [Description("最大值,>MinValue"), Category("自定义")] 61         public decimal MaxValue 62         { 63             get { return maxValue; } 64             set 65             { 66                 if (value <= minValue) 67                     return; 68                 maxValue = value; 69                 Refresh(); 70             } 71         } 72         /// 
      73         /// 获取或设置控件显示的文字的字体。 74         /// 
 75         /// 
     
      The font.
      76         /// 
     
       77         ///   
       78         ///   
       79         ///   
       80         ///   
       81         /// 
      82         [Description("刻度字体"), Category("自定义")] 83         public override Font Font 84         { 85             get 86             { 87                 return base.Font; 88             } 89             set 90             { 91                 base.Font = value; 92                 Refresh(); 93             } 94         } 95  96         private decimal m_value = 0; 97         /// 
      98         /// Gets or sets the value. 99         /// 
100         /// 
     
      The value.
     101         [Description("值，>=MinValue并且<=MaxValue"), Category("自定义")]102         public decimal Value103         {104             get { return m_value; }105             set106             {107                 if (value < minValue || value > maxValue)108                     return;109                 m_value = value;110                 Refresh();111             }112         }113 114         private MeterTextLocation textLocation = MeterTextLocation.None;115         /// 
     116         /// Gets or sets the text location.117         /// 
118         /// 
     
      The text location.
     119         [Description("值和固定文字显示位置"), Category("自定义")]120         public MeterTextLocation TextLocation121         {122             get { return textLocation; }123             set124             {125                 textLocation = value;126                 Refresh();127             }128         }129 130         private string fixedText;131         /// 
     132         /// Gets or sets the fixed text.133         /// 
134         /// 
     
      The fixed text.
     135         [Description("固定文字"), Category("自定义")]136         public string FixedText137         {138             get { return fixedText; }139             set140             {141                 fixedText = value;142                 Refresh();143             }144         }145 146         private Font textFont = DefaultFont;147         /// 
     148         /// Gets or sets the text font.149         /// 
150         /// 
     
      The text font.
     151         [Description("值和固定文字字体"), Category("自定义")]152         public Font TextFont153         {154             get { return textFont; }155             set156             {157                 textFont = value;158                 Refresh();159             }160         }161 162         private Color externalRoundColor = Color.FromArgb(255, 77, 59);163         /// 
     164         /// Gets or sets the color of the external round.165         /// 
166         /// 
     
      The color of the external round.
     167         [Description("外圆颜色"), Category("自定义")]168         public Color ExternalRoundColor169         {170             get { return externalRoundColor; }171             set172             {173                 externalRoundColor = value;174                 Refresh();175             }176         }177 178         private Color insideRoundColor = Color.FromArgb(255, 77, 59);179         /// 
     180         /// Gets or sets the color of the inside round.181         /// 
182         /// 
     
      The color of the inside round.
     183         [Description("内圆颜色"), Category("自定义")]184         public Color InsideRoundColor185         {186             get { return insideRoundColor; }187             set188             {189                 insideRoundColor = value;190                 Refresh();191             }192         }193 194         private Color boundaryLineColor = Color.FromArgb(255, 77, 59);195         /// 
     196         /// Gets or sets the color of the boundary line.197         /// 
198         /// 
     
      The color of the boundary line.
     199         [Description("边界线颜色"), Category("自定义")]200         public Color BoundaryLineColor201         {202             get { return boundaryLineColor; }203             set204             {205                 boundaryLineColor = value;206                 Refresh();207             }208         }209 210         private Color scaleColor = Color.FromArgb(255, 77, 59);211         /// 
     212         /// Gets or sets the color of the scale.213         /// 
214         /// 
     
      The color of the scale.
     215         [Description("刻度颜色"), Category("自定义")]216         public Color ScaleColor217         {218             get { return scaleColor; }219             set220             {221                 scaleColor = value;222                 Refresh();223             }224         }225 226         private Color scaleValueColor = Color.FromArgb(255, 77, 59);227         /// 
     228         /// Gets or sets the color of the scale value.229         /// 
230         /// 
     
      The color of the scale value.
     231         [Description("刻度值文字颜色"), Category("自定义")]232         public Color ScaleValueColor233         {234             get { return scaleValueColor; }235             set236             {237                 scaleValueColor = value;238                 Refresh();239             }240         }241 242         private Color pointerColor = Color.FromArgb(255, 77, 59);243         /// 
     244         /// Gets or sets the color of the pointer.245         /// 
246         /// 
     
      The color of the pointer.
     247         [Description("指针颜色"), Category("自定义")]248         public Color PointerColor249         {250             get { return pointerColor; }251             set252             {253                 pointerColor = value;254                 Refresh();255             }256         }257 258         private Color textColor = Color.FromArgb(255, 77, 59);259         /// 
     260         /// Gets or sets the color of the text.261         /// 
262         /// 
     
      The color of the text.
     263         [Description("值和固定文字颜色"), Category("自定义")]264         public Color TextColor265         {266             get { return textColor; }267             set268             {269                 textColor = value;270                 Refresh();271             }272         }273 274         Rectangle m_rectWorking;

重绘

1  protected override void OnPaint(PaintEventArgs e) 2         { 3             base.OnPaint(e); 4             var g = e.Graphics; 5             g.SetGDIHigh(); 6  7             //外圆 8             float fltStartAngle = -90 - (meterDegrees) / 2 + 360; 9             var r1 = new Rectangle(m_rectWorking.Location, new Size(m_rectWorking.Width, m_rectWorking.Width));10             g.DrawArc(new Pen(new SolidBrush(externalRoundColor), 1), r1, fltStartAngle, meterDegrees);11             //内圆12             var r2 = new Rectangle(m_rectWorking.Left + (m_rectWorking.Width - m_rectWorking.Width / 4) / 2, m_rectWorking.Top + (m_rectWorking.Width - m_rectWorking.Width / 4) / 2, m_rectWorking.Width / 4, m_rectWorking.Width / 4);13             g.DrawArc(new Pen(new SolidBrush(insideRoundColor), 1), r2, fltStartAngle, meterDegrees);14 15             //边界线16             if (meterDegrees != 360)17             {18                 float fltAngle = fltStartAngle - 180;19 20                 float intY = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - m_rectWorking.Width / 8) * Math.Sin(Math.PI * (fltAngle / 180.00F))));21                 float intX = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - m_rectWorking.Width / 8) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));22 23                 float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Sin(Math.PI * (fltAngle / 180.00F))));24                 float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Cos(Math.PI * (fltAngle / 180.00F)))));25 26                 g.DrawLine(new Pen(new SolidBrush(boundaryLineColor), 1), new PointF(intX, intY), new PointF(fltX1, fltY1));27                 g.DrawLine(new Pen(new SolidBrush(boundaryLineColor), 1), new PointF(m_rectWorking.Right - (fltX1 - m_rectWorking.Left), fltY1), new PointF(m_rectWorking.Right - (intX - m_rectWorking.Left), intY));28             }29 30             //分割线31             int _splitCount = splitCount * 2;32             float fltSplitValue = (float)meterDegrees / (float)_splitCount;33             for (int i = 0; i <= _splitCount; i++)34             {35                 float fltAngle = (fltStartAngle + fltSplitValue * i - 180) % 360;36                 float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Sin(Math.PI * (fltAngle / 180.00F))));37                 float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));38                 float fltY2 = 0;39                 float fltX2 = 0;40                 if (i % 2 == 0)41                 {42                     fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Sin(Math.PI * (fltAngle / 180.00F))));43                     fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));44                     if (!(meterDegrees == 360 && i == _splitCount))45                     {46                         decimal decValue = minValue + (maxValue - minValue) / _splitCount * i;47                         var txtSize = g.MeasureString(decValue.ToString("0.##"), this.Font);48                         float fltFY1 = (float)(m_rectWorking.Top - txtSize.Height / 2 + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 20) * Math.Sin(Math.PI * (fltAngle / 180.00F))));49                         float fltFX1 = (float)(m_rectWorking.Left - txtSize.Width / 2 + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 20) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));50                         g.DrawString(decValue.ToString("0.##"), Font, new SolidBrush(scaleValueColor), fltFX1, fltFY1);51                     }52                 }53                 else54                 {55                     fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Sin(Math.PI * (fltAngle / 180.00F))));56                     fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));57                 }58                 g.DrawLine(new Pen(new SolidBrush(scaleColor), i % 2 == 0 ? 2 : 1), new PointF(fltX1, fltY1), new PointF(fltX2, fltY2));59             }60 61             //值文字和固定文字62             if (textLocation != MeterTextLocation.None)63             {64                 string str = m_value.ToString("0.##");65                 var txtSize = g.MeasureString(str, textFont);66                 float fltY = m_rectWorking.Top + m_rectWorking.Width / 4 - txtSize.Height / 2;67                 float fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;68                 g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));69 70                 if (!string.IsNullOrEmpty(fixedText))71                 {72                     str = fixedText;73                     txtSize = g.MeasureString(str, textFont);74                     fltY = m_rectWorking.Top + m_rectWorking.Width / 4 + txtSize.Height / 2;75                     fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;76                     g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));77                 }78             }79 80             //画指针81             g.FillEllipse(new SolidBrush(Color.FromArgb(100, pointerColor.R, pointerColor.G, pointerColor.B)), new Rectangle(m_rectWorking.Left + m_rectWorking.Width / 2 - 10, m_rectWorking.Top + m_rectWorking.Width / 2 - 10, 20, 20));82             g.FillEllipse(Brushes.Red, new Rectangle(m_rectWorking.Left + m_rectWorking.Width / 2 - 5, m_rectWorking.Top + m_rectWorking.Width / 2 - 5, 10, 10));83             float fltValueAngle = (fltStartAngle + ((float)(m_value - minValue) / (float)(maxValue - minValue)) * (float)meterDegrees - 180) % 360;84             float intValueY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Sin(Math.PI * (fltValueAngle / 180.00F))));85             float intValueX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Cos(Math.PI * (fltValueAngle / 180.00F)))));86             g.DrawLine(new Pen(new SolidBrush(pointerColor), 3), intValueX1, intValueY1, m_rectWorking.Left + m_rectWorking.Width / 2, m_rectWorking.Top + m_rectWorking.Width / 2);87         }

还有一个显示文字位置的枚举

1 ///  2     /// Enum MeterTextLocation 3     /// 
 4     public enum MeterTextLocation 5     { 6         ///  7         /// The none 8         /// 
 9         None,10         /// 11         /// The top12         /// 
13         Top,14         /// 15         /// The bottom16         /// 
17         Bottom18     }

代码就这么多了，看完整代码

1 // ***********************************************************************  2 // Assembly         : HZH_Controls  3 // Created          : 2019-09-03  4 //  5 // ***********************************************************************  6 // 
     
        7 //     Copyright by Huang Zhenghui(黄正辉) All, QQ group:568015492 QQ:623128629 Email:623128629@qq.com  8 // 
       9 // 10 // Blog: https://www.cnblogs.com/bfyx 11 // GitHub：https://github.com/kwwwvagaa/NetWinformControl 12 // gitee：https://gitee.com/kwwwvagaa/net_winform_custom_control.git 13 // 14 // If you use this code, please keep this note. 15 // *********************************************************************** 16 using System; 17 using System.Collections.Generic; 18 using System.Linq; 19 using System.Text; 20 using System.Windows.Forms; 21 using System.Drawing; 22 using System.Drawing.Drawing2D; 23 using System.ComponentModel; 24  25 namespace HZH_Controls.Controls 26 { 27     ///  28     /// Class UCMeter. 29     /// Implements the 
       30     /// 
 31     /// 
      32     public class UCMeter : UserControl 33     { 34         private int splitCount = 10; 35         ///  36         /// Gets or sets the split count. 37         /// 
 38         /// 
     
      The split count.
      39         [Description("分隔刻度数量，>1"), Category("自定义")] 40         public int SplitCount 41         { 42             get { return splitCount; } 43             set 44             { 45                 if (value < 1) 46                     return; 47                 splitCount = value; 48                 Refresh(); 49             } 50         } 51  52         private int meterDegrees = 150; 53         ///  54         /// Gets or sets the meter degrees. 55         /// 
 56         /// 
     
      The meter degrees.
      57         [Description("表盘跨度角度，0-360"), Category("自定义")] 58         public int MeterDegrees 59         { 60             get { return meterDegrees; } 61             set 62             { 63                 if (value > 360 || value <= 0) 64                     return; 65                 meterDegrees = value; 66                 Refresh(); 67             } 68         } 69  70         private decimal minValue = 0; 71         ///  72         /// Gets or sets the minimum value. 73         /// 
 74         /// 
     
      The minimum value.
      75         [Description("最小值,
     
      = maxValue) 82                     return; 83                 minValue = value; 84                 Refresh(); 85             } 86         } 87  88         private decimal maxValue = 100; 89         /// 
       90         /// Gets or sets the maximum value. 91         /// 
 92         /// 
      
       The maximum value.
       93         [Description("最大值,>MinValue"), Category("自定义")] 94         public decimal MaxValue 95         { 96             get { return maxValue; } 97             set 98             { 99                 if (value <= minValue)100                     return;101                 maxValue = value;102                 Refresh();103             }104         }105         /// 
      106         /// 获取或设置控件显示的文字的字体。107         /// 
108         /// 
      
       The font.
      109         /// 
      
       110         ///   
       111         ///   
       112         ///   
       113         ///   
       114         /// 
      115         [Description("刻度字体"), Category("自定义")]116         public override Font Font117         {118             get119             {120                 return base.Font;121             }122             set123             {124                 base.Font = value;125                 Refresh();126             }127         }128 129         private decimal m_value = 0;130         /// 
      131         /// Gets or sets the value.132         /// 
133         /// 
      
       The value.
      134         [Description("值，>=MinValue并且<=MaxValue"), Category("自定义")]135         public decimal Value136         {137             get { return m_value; }138             set139             {140                 if (value < minValue || value > maxValue)141                     return;142                 m_value = value;143                 Refresh();144             }145         }146 147         private MeterTextLocation textLocation = MeterTextLocation.None;148         /// 
      149         /// Gets or sets the text location.150         /// 
151         /// 
      
       The text location.
      152         [Description("值和固定文字显示位置"), Category("自定义")]153         public MeterTextLocation TextLocation154         {155             get { return textLocation; }156             set157             {158                 textLocation = value;159                 Refresh();160             }161         }162 163         private string fixedText;164         /// 
      165         /// Gets or sets the fixed text.166         /// 
167         /// 
      
       The fixed text.
      168         [Description("固定文字"), Category("自定义")]169         public string FixedText170         {171             get { return fixedText; }172             set173             {174                 fixedText = value;175                 Refresh();176             }177         }178 179         private Font textFont = DefaultFont;180         /// 
      181         /// Gets or sets the text font.182         /// 
183         /// 
      
       The text font.
      184         [Description("值和固定文字字体"), Category("自定义")]185         public Font TextFont186         {187             get { return textFont; }188             set189             {190                 textFont = value;191                 Refresh();192             }193         }194 195         private Color externalRoundColor = Color.FromArgb(255, 77, 59);196         /// 
      197         /// Gets or sets the color of the external round.198         /// 
199         /// 
      
       The color of the external round.
      200         [Description("外圆颜色"), Category("自定义")]201         public Color ExternalRoundColor202         {203             get { return externalRoundColor; }204             set205             {206                 externalRoundColor = value;207                 Refresh();208             }209         }210 211         private Color insideRoundColor = Color.FromArgb(255, 77, 59);212         /// 
      213         /// Gets or sets the color of the inside round.214         /// 
215         /// 
      
       The color of the inside round.
      216         [Description("内圆颜色"), Category("自定义")]217         public Color InsideRoundColor218         {219             get { return insideRoundColor; }220             set221             {222                 insideRoundColor = value;223                 Refresh();224             }225         }226 227         private Color boundaryLineColor = Color.FromArgb(255, 77, 59);228         /// 
      229         /// Gets or sets the color of the boundary line.230         /// 
231         /// 
      
       The color of the boundary line.
      232         [Description("边界线颜色"), Category("自定义")]233         public Color BoundaryLineColor234         {235             get { return boundaryLineColor; }236             set237             {238                 boundaryLineColor = value;239                 Refresh();240             }241         }242 243         private Color scaleColor = Color.FromArgb(255, 77, 59);244         /// 
      245         /// Gets or sets the color of the scale.246         /// 
247         /// 
      
       The color of the scale.
      248         [Description("刻度颜色"), Category("自定义")]249         public Color ScaleColor250         {251             get { return scaleColor; }252             set253             {254                 scaleColor = value;255                 Refresh();256             }257         }258 259         private Color scaleValueColor = Color.FromArgb(255, 77, 59);260         /// 
      261         /// Gets or sets the color of the scale value.262         /// 
263         /// 
      
       The color of the scale value.
      264         [Description("刻度值文字颜色"), Category("自定义")]265         public Color ScaleValueColor266         {267             get { return scaleValueColor; }268             set269             {270                 scaleValueColor = value;271                 Refresh();272             }273         }274 275         private Color pointerColor = Color.FromArgb(255, 77, 59);276         /// 
      277         /// Gets or sets the color of the pointer.278         /// 
279         /// 
      
       The color of the pointer.
      280         [Description("指针颜色"), Category("自定义")]281         public Color PointerColor282         {283             get { return pointerColor; }284             set285             {286                 pointerColor = value;287                 Refresh();288             }289         }290 291         private Color textColor = Color.FromArgb(255, 77, 59);292         /// 
      293         /// Gets or sets the color of the text.294         /// 
295         /// 
      
       The color of the text.
      296         [Description("值和固定文字颜色"), Category("自定义")]297         public Color TextColor298         {299             get { return textColor; }300             set301             {302                 textColor = value;303                 Refresh();304             }305         }306 307         Rectangle m_rectWorking;308         public UCMeter()309         {310             this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);311             this.SetStyle(ControlStyles.DoubleBuffer, true);312             this.SetStyle(ControlStyles.ResizeRedraw, true);313             this.SetStyle(ControlStyles.Selectable, true);314             this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);315             this.SetStyle(ControlStyles.UserPaint, true);316             this.SizeChanged += UCMeter1_SizeChanged;317             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;318             this.Size = new Size(350, 200);319         }320 321         void UCMeter1_SizeChanged(object sender, EventArgs e)322         {323             m_rectWorking = new Rectangle(10, 10, this.Width - 20, this.Height - 20);324         }325 326 327         protected override void OnPaint(PaintEventArgs e)328         {329             base.OnPaint(e);330             var g = e.Graphics;331             g.SetGDIHigh();332 333             //外圆334             float fltStartAngle = -90 - (meterDegrees) / 2 + 360;335             var r1 = new Rectangle(m_rectWorking.Location, new Size(m_rectWorking.Width, m_rectWorking.Width));336             g.DrawArc(new Pen(new SolidBrush(externalRoundColor), 1), r1, fltStartAngle, meterDegrees);337             //内圆338             var r2 = new Rectangle(m_rectWorking.Left + (m_rectWorking.Width - m_rectWorking.Width / 4) / 2, m_rectWorking.Top + (m_rectWorking.Width - m_rectWorking.Width / 4) / 2, m_rectWorking.Width / 4, m_rectWorking.Width / 4);339             g.DrawArc(new Pen(new SolidBrush(insideRoundColor), 1), r2, fltStartAngle, meterDegrees);340 341             //边界线342             if (meterDegrees != 360)343             {344                 float fltAngle = fltStartAngle - 180;345 346                 float intY = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - m_rectWorking.Width / 8) * Math.Sin(Math.PI * (fltAngle / 180.00F))));347                 float intX = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - m_rectWorking.Width / 8) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));348 349                 float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Sin(Math.PI * (fltAngle / 180.00F))));350                 float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Cos(Math.PI * (fltAngle / 180.00F)))));351 352                 g.DrawLine(new Pen(new SolidBrush(boundaryLineColor), 1), new PointF(intX, intY), new PointF(fltX1, fltY1));353                 g.DrawLine(new Pen(new SolidBrush(boundaryLineColor), 1), new PointF(m_rectWorking.Right - (fltX1 - m_rectWorking.Left), fltY1), new PointF(m_rectWorking.Right - (intX - m_rectWorking.Left), intY));354             }355 356             //分割线357             int _splitCount = splitCount * 2;358             float fltSplitValue = (float)meterDegrees / (float)_splitCount;359             for (int i = 0; i <= _splitCount; i++)360             {361                 float fltAngle = (fltStartAngle + fltSplitValue * i - 180) % 360;362                 float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Sin(Math.PI * (fltAngle / 180.00F))));363                 float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));364                 float fltY2 = 0;365                 float fltX2 = 0;366                 if (i % 2 == 0)367                 {368                     fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Sin(Math.PI * (fltAngle / 180.00F))));369                     fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));370                     if (!(meterDegrees == 360 && i == _splitCount))371                     {372                         decimal decValue = minValue + (maxValue - minValue) / _splitCount * i;373                         var txtSize = g.MeasureString(decValue.ToString("0.##"), this.Font);374                         float fltFY1 = (float)(m_rectWorking.Top - txtSize.Height / 2 + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 20) * Math.Sin(Math.PI * (fltAngle / 180.00F))));375                         float fltFX1 = (float)(m_rectWorking.Left - txtSize.Width / 2 + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 20) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));376                         g.DrawString(decValue.ToString("0.##"), Font, new SolidBrush(scaleValueColor), fltFX1, fltFY1);377                     }378                 }379                 else380                 {381                     fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Sin(Math.PI * (fltAngle / 180.00F))));382                     fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));383                 }384                 g.DrawLine(new Pen(new SolidBrush(scaleColor), i % 2 == 0 ? 2 : 1), new PointF(fltX1, fltY1), new PointF(fltX2, fltY2));385             }386 387             //值文字和固定文字388             if (textLocation != MeterTextLocation.None)389             {390                 string str = m_value.ToString("0.##");391                 var txtSize = g.MeasureString(str, textFont);392                 float fltY = m_rectWorking.Top + m_rectWorking.Width / 4 - txtSize.Height / 2;393                 float fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;394                 g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));395 396                 if (!string.IsNullOrEmpty(fixedText))397                 {398                     str = fixedText;399                     txtSize = g.MeasureString(str, textFont);400                     fltY = m_rectWorking.Top + m_rectWorking.Width / 4 + txtSize.Height / 2;401                     fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;402                     g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));403                 }404             }405 406             //画指针407             g.FillEllipse(new SolidBrush(Color.FromArgb(100, pointerColor.R, pointerColor.G, pointerColor.B)), new Rectangle(m_rectWorking.Left + m_rectWorking.Width / 2 - 10, m_rectWorking.Top + m_rectWorking.Width / 2 - 10, 20, 20));408             g.FillEllipse(Brushes.Red, new Rectangle(m_rectWorking.Left + m_rectWorking.Width / 2 - 5, m_rectWorking.Top + m_rectWorking.Width / 2 - 5, 10, 10));409             float fltValueAngle = (fltStartAngle + ((float)(m_value - minValue) / (float)(maxValue - minValue)) * (float)meterDegrees - 180) % 360;410             float intValueY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Sin(Math.PI * (fltValueAngle / 180.00F))));411             float intValueX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Cos(Math.PI * (fltValueAngle / 180.00F)))));412             g.DrawLine(new Pen(new SolidBrush(pointerColor), 3), intValueX1, intValueY1, m_rectWorking.Left + m_rectWorking.Width / 2, m_rectWorking.Top + m_rectWorking.Width / 2);413         }414     }415 416     /// 
      417     /// Enum MeterTextLocation418     /// 
419     public enum MeterTextLocation420     {421         /// 
      422         /// The none423         /// 
424         None,425         /// 
      426         /// The top427         /// 
428         Top,429         /// 
      430         /// The bottom431         /// 
432         Bottom433     }434 }