（五十四）c#Winform自定义控件-仪表盘
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：https://github.com/kwwwvagaa/NetWinformControl
码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
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目录
https://blog.csdn.net/kwwwvagaa/article/details/100586547
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 ///
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 Value
103 {
104 get { return m_value; }
105 set
106 {
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 TextLocation
121 {
122 get { return textLocation; }
123 set
124 {
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 FixedText
137 {
138 get { return fixedText; }
139 set
140 {
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 TextFont
153 {
154 get { return textFont; }
155 set
156 {
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 ExternalRoundColor
169 {
170 get { return externalRoundColor; }
171 set
172 {
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 InsideRoundColor
185 {
186 get { return insideRoundColor; }
187 set
188 {
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 BoundaryLineColor
201 {
202 get { return boundaryLineColor; }
203 set
204 {
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 ScaleColor
217 {
218 get { return scaleColor; }
219 set
220 {
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 ScaleValueColor
233 {
234 get { return scaleValueColor; }
235 set
236 {
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 PointerColor
249 {
250 get { return pointerColor; }
251 set
252 {
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 TextColor
265 {
266 get { return textColor; }
267 set
268 {
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 else
54 {
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 top
12 ///
13 Top,
14 ///
15 /// The bottom
16 ///
17 Bottom
18 }
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:[email protected]
//
//
// 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
///
/// 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
}
} 最后的话
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