这篇文章主要介绍c#中Winform自定义控件如何实现仪表盘功能，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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; /// <summary> /// Gets or sets the split count. /// </summary> /// <value>The split count.</value> [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; /// <summary> /// Gets or sets the meter degrees. /// </summary> /// <value>The meter degrees.</value> [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; /// <summary> /// Gets or sets the minimum value. /// </summary> /// <value>The minimum value.</value> [Description("最小值,<MaxValue"), Category("自定义")] public decimal MinValue { get { return minValue; } set { if (value >= maxValue) return; minValue = value; Refresh(); } } private decimal maxValue = 100; /// <summary> /// Gets or sets the maximum value. /// </summary> /// <value>The maximum value.</value> [Description("最大值,>MinValue"), Category("自定义")] public decimal MaxValue { get { return maxValue; } set { if (value <= minValue) return; maxValue = value; Refresh(); } } /// <summary> /// 获取或设置控件显示的文字的字体。 /// </summary> /// <value>The font.</value> /// <PermissionSet> /// <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" /> /// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" /> /// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence" /> /// <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" /> /// </PermissionSet> [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; /// <summary> /// Gets or sets the value. /// </summary> /// <value>The value.</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; /// <summary> /// Gets or sets the text location. /// </summary> /// <value>The text location.</value> [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; /// <summary> /// Gets or sets the fixed text. /// </summary> /// <value>The fixed text.</value> [Description("固定文字"), Category("自定义")] public string FixedText { get { return fixedText; } set { fixedText = value; Refresh(); } } private Font textFont = DefaultFont; /// <summary> /// Gets or sets the text font. /// </summary> /// <value>The text font.</value> [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); /// <summary> /// Gets or sets the color of the external round. /// </summary> /// <value>The color of the external round.</value> [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); /// <summary> /// Gets or sets the color of the inside round. /// </summary> /// <value>The color of the inside round.</value> [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); /// <summary> /// Gets or sets the color of the boundary line. /// </summary> /// <value>The color of the boundary line.</value> [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); /// <summary> /// Gets or sets the color of the scale. /// </summary> /// <value>The color of the scale.</value> [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); /// <summary> /// Gets or sets the color of the scale value. /// </summary> /// <value>The color of the scale value.</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); /// <summary> /// Gets or sets the color of the pointer. /// </summary> /// <value>The color of the pointer.</value> [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); /// <summary> /// Gets or sets the color of the text. /// </summary> /// <value>The color of the text.</value> [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
/// <summary> /// Enum MeterTextLocation /// </summary> public enum MeterTextLocation { /// <summary> /// The none /// </summary> None, /// <summary> /// The top /// </summary> Top, /// <summary> /// The bottom /// </summary> Bottom }代码就这么多了，看完整代码
// ***********************************************************************// Assembly : HZH_Controls// Created : 2019-09-03//// ***********************************************************************// <copyright file="UCMeter.cs">// Copyright by Huang Zhenghui(黄正辉) All, QQ group:568015492 QQ:623128629 Email:623128629@qq.com// </copyright>//// 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{ /// <summary> /// Class UCMeter. /// Implements the <see cref="System.Windows.Forms.UserControl" /> /// </summary> /// <seealso cref="System.Windows.Forms.UserControl" /> public class UCMeter : UserControl { private int splitCount = 10; /// <summary> /// Gets or sets the split count. /// </summary> /// <value>The split count.</value> [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; /// <summary> /// Gets or sets the meter degrees. /// </summary> /// <value>The meter degrees.</value> [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; /// <summary> /// Gets or sets the minimum value. /// </summary> /// <value>The minimum value.</value> [Description("最小值,<MaxValue"), Category("自定义")] public decimal MinValue { get { return minValue; } set { if (value >= maxValue) return; minValue = value; Refresh(); } } private decimal maxValue = 100; /// <summary> /// Gets or sets the maximum value. /// </summary> /// <value>The maximum value.</value> [Description("最大值,>MinValue"), Category("自定义")] public decimal MaxValue { get { return maxValue; } set { if (value <= minValue) return; maxValue = value; Refresh(); } } /// <summary> /// 获取或设置控件显示的文字的字体。 /// </summary> /// <value>The font.</value> /// <PermissionSet> /// <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" /> /// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" /> /// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence" /> /// <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" /> /// </PermissionSet> [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; /// <summary> /// Gets or sets the value. /// </summary> /// <value>The value.</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; /// <summary> /// Gets or sets the text location. /// </summary> /// <value>The text location.</value> [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; /// <summary> /// Gets or sets the fixed text. /// </summary> /// <value>The fixed text.</value> [Description("固定文字"), Category("自定义")] public string FixedText { get { return fixedText; } set { fixedText = value; Refresh(); } } private Font textFont = DefaultFont; /// <summary> /// Gets or sets the text font. /// </summary> /// <value>The text font.</value> [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); /// <summary> /// Gets or sets the color of the external round. /// </summary> /// <value>The color of the external round.</value> [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); /// <summary> /// Gets or sets the color of the inside round. /// </summary> /// <value>The color of the inside round.</value> [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); /// <summary> /// Gets or sets the color of the boundary line. /// </summary> /// <value>The color of the boundary line.</value> [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); /// <summary> /// Gets or sets the color of the scale. /// </summary> /// <value>The color of the scale.</value> [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); /// <summary> /// Gets or sets the color of the scale value. /// </summary> /// <value>The color of the scale value.</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); /// <summary> /// Gets or sets the color of the pointer. /// </summary> /// <value>The color of the pointer.</value> [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); /// <summary> /// Gets or sets the color of the text. /// </summary> /// <value>The color of the text.</value> [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); } } /// <summary> /// Enum MeterTextLocation /// </summary> public enum MeterTextLocation { /// <summary> /// The none /// </summary> None, /// <summary> /// The top /// </summary> Top, /// <summary> /// The bottom /// </summary> Bottom }}以上是“c#中Winform自定义控件如何实现仪表盘功能”这篇文章的所有内容，感谢各位的阅读！希望分享的内容对大家有帮助，更多相关知识，欢迎关注亿速云行业资讯频道！
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