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

目录

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

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

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("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;

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