c#Winform自定义控件-仪表盘功能

前提

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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：https://github.com/kwwwvagaa/NetWinformControl

码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git

NuGet

Install-Package HZH_Controls

https://www.cnblogs.com/bfyx/p/11364884.html

用处及效果

c# Winform自定义控件-仪表盘功能

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

private int splitCount = 10;
     /// 
     /// Gets or sets the split count.
     /// 
     /// The split count.
     [Description("分隔刻度数量，>1"), Category("自定义")]
     public int SplitCount
     {
       get { return splitCount; }
      set
      {
        if (value < 1)
          return;
        splitCount = value;
        Refresh();
      }
    }
    private int meterDegrees = 150;
    /// 
    /// Gets or sets the meter degrees.
    /// 
    /// The meter degrees.
    [Description("表盘跨度角度，0-360"), Category("自定义")]
    public int MeterDegrees
    {
      get { return meterDegrees; }
      set
      {
        if (value > 360 || value <= 0)
          return;
        meterDegrees = value;
        Refresh();
      }
    }
    private decimal minValue = 0;
    /// 
    /// Gets or sets the minimum value.
    /// 
    /// The minimum value.
    [Description("最小值,= maxValue)
          return;
        minValue = value;
        Refresh();
      }
    }
    private decimal maxValue = 100;
    /// 
    /// Gets or sets the maximum value.
    /// 
    /// The maximum value.
    [Description("最大值,>MinValue"), Category("自定义")]
    public decimal MaxValue
    {
      get { return maxValue; }
      set
      {
        if (value <= minValue)
          return;
        maxValue = value;
        Refresh();
      }
    }
    /// 
    /// 获取或设置控件显示的文字的字体。
    /// 
    /// The font.
    /// 
    ///  
    ///  
    ///  
    ///  
    /// 
    [Description("刻度字体"), Category("自定义")]
    public override Font Font
    {
      get
      {
        return base.Font;
      }
      set
      {
        base.Font = value;
        Refresh();
      }
    }
    private decimal m_value = 0;
    /// 
    /// Gets or sets the value.
    /// 
    /// The value.
    [Description("值，>=MinValue并且<=MaxValue"), Category("自定义")]
    public decimal Value
    {
      get { return m_value; }
      set
      {
        if (value < minValue || value > maxValue)
          return;
        m_value = value;
        Refresh();
      }
    }
    private MeterTextLocation textLocation = MeterTextLocation.None;
    /// 
    /// Gets or sets the text location.
    /// 
    /// The text location.
    [Description("值和固定文字显示位置"), Category("自定义")]
    public MeterTextLocation TextLocation
    {
      get { return textLocation; }
      set
      {
        textLocation = value;
        Refresh();
      }
    }
    private string fixedText;
    /// 
    /// Gets or sets the fixed text.
    /// 
    /// The fixed text.
    [Description("固定文字"), Category("自定义")]
    public string FixedText
    {
      get { return fixedText; }
      set
      {
        fixedText = value;
        Refresh();
      }
    }
    private Font textFont = DefaultFont;
    /// 
    /// Gets or sets the text font.
    /// 
    /// The text font.
    [Description("值和固定文字字体"), Category("自定义")]
    public Font TextFont
    {
      get { return textFont; }
      set
      {
        textFont = value;
        Refresh();
      }
    }
    private Color externalRoundColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the external round.
    /// 
    /// The color of the external round.
    [Description("外圆颜色"), Category("自定义")]
    public Color ExternalRoundColor
    {
      get { return externalRoundColor; }
      set
      {
        externalRoundColor = value;
        Refresh();
      }
    }
    private Color insideRoundColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the inside round.
    /// 
    /// The color of the inside round.
    [Description("内圆颜色"), Category("自定义")]
    public Color InsideRoundColor
    {
      get { return insideRoundColor; }
      set
      {
        insideRoundColor = value;
        Refresh();
      }
    }
    private Color boundaryLineColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the boundary line.
    /// 
    /// The color of the boundary line.
    [Description("边界线颜色"), Category("自定义")]
    public Color BoundaryLineColor
    {
      get { return boundaryLineColor; }
      set
      {
        boundaryLineColor = value;
        Refresh();
      }
    }
    private Color scaleColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the scale.
    /// 
    /// The color of the scale.
    [Description("刻度颜色"), Category("自定义")]
    public Color ScaleColor
    {
      get { return scaleColor; }
      set
      {
        scaleColor = value;
        Refresh();
      }
    }
    private Color scaleValueColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the scale value.
    /// 
    /// The color of the scale value.
    [Description("刻度值文字颜色"), Category("自定义")]
    public Color ScaleValueColor
    {
      get { return scaleValueColor; }
      set
      {
        scaleValueColor = value;
        Refresh();
      }
    }
    private Color pointerColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the pointer.
    /// 
    /// The color of the pointer.
    [Description("指针颜色"), Category("自定义")]
    public Color PointerColor
    {
      get { return pointerColor; }
      set
      {
        pointerColor = value;
        Refresh();
      }
    }
    private Color textColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the text.
    /// 
    /// The color of the text.
    [Description("值和固定文字颜色"), Category("自定义")]
    public Color TextColor
    {
      get { return textColor; }
      set
      {
        textColor = value;
        Refresh();
      }
    }

    Rectangle m_rectWorking;

重绘

protected override void OnPaint(PaintEventArgs e)
     {
       base.OnPaint(e);
       var g = e.Graphics;
       g.SetGDIHigh();
       //外圆
       float fltStartAngle = -90 - (meterDegrees) / 2 + 360;
       var r1 = new Rectangle(m_rectWorking.Location, new Size(m_rectWorking.Width, m_rectWorking.Width));
       g.DrawArc(new Pen(new SolidBrush(externalRoundColor), 1), r1, fltStartAngle, meterDegrees);
       //内圆
       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);
       g.DrawArc(new Pen(new SolidBrush(insideRoundColor), 1), r2, fltStartAngle, meterDegrees);
       //边界线
       if (meterDegrees != 360)
       {
         float fltAngle = fltStartAngle - 180;
         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))));
         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)))));
         float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Sin(Math.PI * (fltAngle / 180.00F))));
         float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
         g.DrawLine(new Pen(new SolidBrush(boundaryLineColor), 1), new PointF(intX, intY), new PointF(fltX1, fltY1));
         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));
       }
       //分割线
       int _splitCount = splitCount * 2;
       float fltSplitValue = (float)meterDegrees / (float)_splitCount;
       for (int i = 0; i <= _splitCount; i++)
       {
         float fltAngle = (fltStartAngle + fltSplitValue * i - 180) % 360;
         float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Sin(Math.PI * (fltAngle / 180.00F))));
         float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
         float fltY2 = 0;
         float fltX2 = 0;
         if (i % 2 == 0)
         {
           fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Sin(Math.PI * (fltAngle / 180.00F))));
           fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
           if (!(meterDegrees == 360 && i == _splitCount))
           {
             decimal decValue = minValue + (maxValue - minValue) / _splitCount * i;
             var txtSize = g.MeasureString(decValue.ToString("0.##"), this.Font);
             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))));
             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)))));
             g.DrawString(decValue.ToString("0.##"), Font, new SolidBrush(scaleValueColor), fltFX1, fltFY1);
           }
         }
         else
         {
           fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Sin(Math.PI * (fltAngle / 180.00F))));
           fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
         }
         g.DrawLine(new Pen(new SolidBrush(scaleColor), i % 2 == 0 ? 2 : 1), new PointF(fltX1, fltY1), new PointF(fltX2, fltY2));
       }
       //值文字和固定文字
       if (textLocation != MeterTextLocation.None)
       {
         string str = m_value.ToString("0.##");
         var txtSize = g.MeasureString(str, textFont);
         float fltY = m_rectWorking.Top + m_rectWorking.Width / 4 - txtSize.Height / 2;
         float fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;
         g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));
         if (!string.IsNullOrEmpty(fixedText))
         {
           str = fixedText;
           txtSize = g.MeasureString(str, textFont);
           fltY = m_rectWorking.Top + m_rectWorking.Width / 4 + txtSize.Height / 2;
           fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;
           g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));
         }
       }
       //画指针
       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));
       g.FillEllipse(Brushes.Red, new Rectangle(m_rectWorking.Left + m_rectWorking.Width / 2 - 5, m_rectWorking.Top + m_rectWorking.Width / 2 - 5, 10, 10));
       float fltValueAngle = (fltStartAngle + ((float)(m_value - minValue) / (float)(maxValue - minValue)) * (float)meterDegrees - 180) % 360;
       float intValueY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Sin(Math.PI * (fltValueAngle / 180.00F))));
       float intValueX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Cos(Math.PI * (fltValueAngle / 180.00F)))));
       g.DrawLine(new Pen(new SolidBrush(pointerColor), 3), intValueX1, intValueY1, m_rectWorking.Left + m_rectWorking.Width / 2, m_rectWorking.Top + m_rectWorking.Width / 2);
     }

还有一个显示文字位置的枚举

 /// 
   /// Enum MeterTextLocation
   /// 
   public enum MeterTextLocation
   {
     /// 
     /// The none
     /// 
     None,
     /// 
     /// The top
     /// 
     Top,
     /// 
     /// The bottom
     /// 
     Bottom
   }

代码就这么多了，看完整代码

// ***********************************************************************
// Assembly     : HZH_Controls
// Created     : 2019-09-03
//
// ***********************************************************************
// 
//   Copyright by Huang Zhenghui(黄正辉) All, QQ group:568015492 QQ:623128629 Email:623128629@qq.com
// 
//
// Blog: https://www.cnblogs.com/bfyx
// GitHub：https://github.com/kwwwvagaa/NetWinformControl
// gitee：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
//
// If you use this code, please keep this note.
// ***********************************************************************
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.ComponentModel;
namespace HZH_Controls.Controls
{
  /// 
  /// Class UCMeter.
  /// Implements the 
  /// 
  /// 
  public class UCMeter : UserControl
  {
    private int splitCount = 10;
    /// 
    /// Gets or sets the split count.
    /// 
    /// The split count.
    [Description("分隔刻度数量，>1"), Category("自定义")]
    public int SplitCount
    {
      get { return splitCount; }
      set
      {
        if (value < 1)
          return;
        splitCount = value;
        Refresh();
      }
    }
    private int meterDegrees = 150;
    /// 
    /// Gets or sets the meter degrees.
    /// 
    /// The meter degrees.
    [Description("表盘跨度角度，0-360"), Category("自定义")]
    public int MeterDegrees
    {
      get { return meterDegrees; }
      set
      {
        if (value > 360 || value <= 0)
          return;
        meterDegrees = value;
        Refresh();
      }
    }
    private decimal minValue = 0;
    /// 
    /// Gets or sets the minimum value.
    /// 
    /// The minimum value.
    [Description("最小值,= maxValue)
          return;
        minValue = value;
        Refresh();
      }
    }
    private decimal maxValue = 100;
    /// 
    /// Gets or sets the maximum value.
    /// 
    /// The maximum value.
    [Description("最大值,>MinValue"), Category("自定义")]
    public decimal MaxValue
    {
      get { return maxValue; }
      set
      {
        if (value <= minValue)
          return;
        maxValue = value;
        Refresh();
      }
    }
    /// 
    /// 获取或设置控件显示的文字的字体。
    /// 
    /// The font.
    /// 
    ///  
    ///  
    ///  
    ///  
    /// 
    [Description("刻度字体"), Category("自定义")]
    public override Font Font
    {
      get
      {
        return base.Font;
      }
      set
      {
        base.Font = value;
        Refresh();
      }
    }
    private decimal m_value = 0;
    /// 
    /// Gets or sets the value.
    /// 
    /// The value.
    [Description("值，>=MinValue并且<=MaxValue"), Category("自定义")]
    public decimal Value
    {
      get { return m_value; }
      set
      {
        if (value < minValue || value > maxValue)
          return;
        m_value = value;
        Refresh();
      }
    }
    private MeterTextLocation textLocation = MeterTextLocation.None;
    /// 
    /// Gets or sets the text location.
    /// 
    /// The text location.
    [Description("值和固定文字显示位置"), Category("自定义")]
    public MeterTextLocation TextLocation
    {
      get { return textLocation; }
      set
      {
        textLocation = value;
        Refresh();
      }
    }
    private string fixedText;
    /// 
    /// Gets or sets the fixed text.
    /// 
    /// The fixed text.
    [Description("固定文字"), Category("自定义")]
    public string FixedText
    {
      get { return fixedText; }
      set
      {
        fixedText = value;
        Refresh();
      }
    }
    private Font textFont = DefaultFont;
    /// 
    /// Gets or sets the text font.
    /// 
    /// The text font.
    [Description("值和固定文字字体"), Category("自定义")]
    public Font TextFont
    {
      get { return textFont; }
      set
      {
        textFont = value;
        Refresh();
      }
    }
    private Color externalRoundColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the external round.
    /// 
    /// The color of the external round.
    [Description("外圆颜色"), Category("自定义")]
    public Color ExternalRoundColor
    {
      get { return externalRoundColor; }
      set
      {
        externalRoundColor = value;
        Refresh();
      }
    }
    private Color insideRoundColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the inside round.
    /// 
    /// The color of the inside round.
    [Description("内圆颜色"), Category("自定义")]
    public Color InsideRoundColor
    {
      get { return insideRoundColor; }
      set
      {
        insideRoundColor = value;
        Refresh();
      }
    }
    private Color boundaryLineColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the boundary line.
    /// 
    /// The color of the boundary line.
    [Description("边界线颜色"), Category("自定义")]
    public Color BoundaryLineColor
    {
      get { return boundaryLineColor; }
      set
      {
        boundaryLineColor = value;
        Refresh();
      }
    }
    private Color scaleColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the scale.
    /// 
    /// The color of the scale.
    [Description("刻度颜色"), Category("自定义")]
    public Color ScaleColor
    {
      get { return scaleColor; }
      set
      {
        scaleColor = value;
        Refresh();
      }
    }
    private Color scaleValueColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the scale value.
    /// 
    /// The color of the scale value.
    [Description("刻度值文字颜色"), Category("自定义")]
    public Color ScaleValueColor
    {
      get { return scaleValueColor; }
      set
      {
        scaleValueColor = value;
        Refresh();
      }
    }
    private Color pointerColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the pointer.
    /// 
    /// The color of the pointer.
    [Description("指针颜色"), Category("自定义")]
    public Color PointerColor
    {
      get { return pointerColor; }
      set
      {
        pointerColor = value;
        Refresh();
      }
    }
    private Color textColor = Color.FromArgb(255, 77, 59);
    /// 
    /// Gets or sets the color of the text.
    /// 
    /// The color of the text.
    [Description("值和固定文字颜色"), Category("自定义")]
    public Color TextColor
    {
      get { return textColor; }
      set
      {
        textColor = value;
        Refresh();
      }
    }
    Rectangle m_rectWorking;
    public UCMeter()
    {
      this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
      this.SetStyle(ControlStyles.DoubleBuffer, true);
      this.SetStyle(ControlStyles.ResizeRedraw, true);
      this.SetStyle(ControlStyles.Selectable, true);
      this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
      this.SetStyle(ControlStyles.UserPaint, true);
      this.SizeChanged += UCMeter1_SizeChanged;
      this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
      this.Size = new Size(350, 200);
    }
    void UCMeter1_SizeChanged(object sender, EventArgs e)
    {
      m_rectWorking = new Rectangle(10, 10, this.Width - 20, this.Height - 20);
    }
    protected override void OnPaint(PaintEventArgs e)
    {
      base.OnPaint(e);
      var g = e.Graphics;
      g.SetGDIHigh();
      //外圆
      float fltStartAngle = -90 - (meterDegrees) / 2 + 360;
      var r1 = new Rectangle(m_rectWorking.Location, new Size(m_rectWorking.Width, m_rectWorking.Width));
      g.DrawArc(new Pen(new SolidBrush(externalRoundColor), 1), r1, fltStartAngle, meterDegrees);
      //内圆
      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);
      g.DrawArc(new Pen(new SolidBrush(insideRoundColor), 1), r2, fltStartAngle, meterDegrees);
      //边界线
      if (meterDegrees != 360)
      {
        float fltAngle = fltStartAngle - 180;
        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))));
        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)))));
        float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Sin(Math.PI * (fltAngle / 180.00F))));
        float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - (m_rectWorking.Width / 8 * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
        g.DrawLine(new Pen(new SolidBrush(boundaryLineColor), 1), new PointF(intX, intY), new PointF(fltX1, fltY1));
        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));
      }
      //分割线
      int _splitCount = splitCount * 2;
      float fltSplitValue = (float)meterDegrees / (float)_splitCount;
      for (int i = 0; i <= _splitCount; i++)
      {
        float fltAngle = (fltStartAngle + fltSplitValue * i - 180) % 360;
        float fltY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Sin(Math.PI * (fltAngle / 180.00F))));
        float fltX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
        float fltY2 = 0;
        float fltX2 = 0;
        if (i % 2 == 0)
        {
          fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Sin(Math.PI * (fltAngle / 180.00F))));
          fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 10) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
          if (!(meterDegrees == 360 && i == _splitCount))
          {
            decimal decValue = minValue + (maxValue - minValue) / _splitCount * i;
            var txtSize = g.MeasureString(decValue.ToString("0.##"), this.Font);
            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))));
            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)))));
            g.DrawString(decValue.ToString("0.##"), Font, new SolidBrush(scaleValueColor), fltFX1, fltFY1);
          }
        }
        else
        {
          fltY2 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Sin(Math.PI * (fltAngle / 180.00F))));
          fltX2 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 5) * Math.Cos(Math.PI * (fltAngle / 180.00F)))));
        }
        g.DrawLine(new Pen(new SolidBrush(scaleColor), i % 2 == 0 ? 2 : 1), new PointF(fltX1, fltY1), new PointF(fltX2, fltY2));
      }
      //值文字和固定文字
      if (textLocation != MeterTextLocation.None)
      {
        string str = m_value.ToString("0.##");
        var txtSize = g.MeasureString(str, textFont);
        float fltY = m_rectWorking.Top + m_rectWorking.Width / 4 - txtSize.Height / 2;
        float fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;
        g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));
        if (!string.IsNullOrEmpty(fixedText))
        {
          str = fixedText;
          txtSize = g.MeasureString(str, textFont);
          fltY = m_rectWorking.Top + m_rectWorking.Width / 4 + txtSize.Height / 2;
          fltX = m_rectWorking.Left + m_rectWorking.Width / 2 - txtSize.Width / 2;
          g.DrawString(str, textFont, new SolidBrush(textColor), new PointF(fltX, fltY));
        }
      }
      //画指针
      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));
      g.FillEllipse(Brushes.Red, new Rectangle(m_rectWorking.Left + m_rectWorking.Width / 2 - 5, m_rectWorking.Top + m_rectWorking.Width / 2 - 5, 10, 10));
      float fltValueAngle = (fltStartAngle + ((float)(m_value - minValue) / (float)(maxValue - minValue)) * (float)meterDegrees - 180) % 360;
      float intValueY1 = (float)(m_rectWorking.Top + m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Sin(Math.PI * (fltValueAngle / 180.00F))));
      float intValueX1 = (float)(m_rectWorking.Left + (m_rectWorking.Width / 2 - ((m_rectWorking.Width / 2 - 30) * Math.Cos(Math.PI * (fltValueAngle / 180.00F)))));
      g.DrawLine(new Pen(new SolidBrush(pointerColor), 3), intValueX1, intValueY1, m_rectWorking.Left + m_rectWorking.Width / 2, m_rectWorking.Top + m_rectWorking.Width / 2);
    }
  }
  /// 
  /// Enum MeterTextLocation
  /// 
  public enum MeterTextLocation
  {
    /// 
    /// The none
    /// 
    None,
    /// 
    /// The top
    /// 
    Top,
    /// 
    /// The bottom
    /// 
    Bottom
  }
}

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总结

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