（五十四）c#Winform自定义控件-仪表盘
程序员文章站
2022-08-02 09:02:42
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_contr ......
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：
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
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 /// <summary>
3 /// gets or sets the split count.
4 /// </summary>
5 /// <value>the split count.</value>
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 /// <summary>
21 /// gets or sets the meter degrees.
22 /// </summary>
23 /// <value>the meter degrees.</value>
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 /// <summary>
39 /// gets or sets the minimum value.
40 /// </summary>
41 /// <value>the minimum value.</value>
42 [description("最小值,<maxvalue"), category("自定义")]
43 public decimal minvalue
44 {
45 get { return minvalue; }
46 set
47 {
48 if (value >= maxvalue)
49 return;
50 minvalue = value;
51 refresh();
52 }
53 }
54
55 private decimal maxvalue = 100;
56 /// <summary>
57 /// gets or sets the maximum value.
58 /// </summary>
59 /// <value>the maximum value.</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 /// <summary>
73 /// 获取或设置控件显示的文字的字体。
74 /// </summary>
75 /// <value>the font.</value>
76 /// <permissionset>
77 /// <ipermission class="system.security.permissions.environmentpermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
78 /// <ipermission class="system.security.permissions.fileiopermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
79 /// <ipermission class="system.security.permissions.securitypermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" flags="unmanagedcode, controlevidence" />
80 /// <ipermission class="system.diagnostics.performancecounterpermission, system, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
81 /// </permissionset>
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 /// <summary>
98 /// gets or sets the value.
99 /// </summary>
100 /// <value>the value.</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 /// <summary>
116 /// gets or sets the text location.
117 /// </summary>
118 /// <value>the text location.</value>
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 /// <summary>
132 /// gets or sets the fixed text.
133 /// </summary>
134 /// <value>the fixed text.</value>
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 /// <summary>
148 /// gets or sets the text font.
149 /// </summary>
150 /// <value>the text font.</value>
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 /// <summary>
164 /// gets or sets the color of the external round.
165 /// </summary>
166 /// <value>the color of the external round.</value>
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 /// <summary>
180 /// gets or sets the color of the inside round.
181 /// </summary>
182 /// <value>the color of the inside round.</value>
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 /// <summary>
196 /// gets or sets the color of the boundary line.
197 /// </summary>
198 /// <value>the color of the boundary line.</value>
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 /// <summary>
212 /// gets or sets the color of the scale.
213 /// </summary>
214 /// <value>the color of the scale.</value>
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 /// <summary>
228 /// gets or sets the color of the scale value.
229 /// </summary>
230 /// <value>the color of the scale value.</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 /// <summary>
244 /// gets or sets the color of the pointer.
245 /// </summary>
246 /// <value>the color of the pointer.</value>
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 /// <summary>
260 /// gets or sets the color of the text.
261 /// </summary>
262 /// <value>the color of the text.</value>
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 /// <summary>
2 /// enum metertextlocation
3 /// </summary>
4 public enum metertextlocation
5 {
6 /// <summary>
7 /// the none
8 /// </summary>
9 none,
10 /// <summary>
11 /// the top
12 /// </summary>
13 top,
14 /// <summary>
15 /// the bottom
16 /// </summary>
17 bottom
18 }
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 // <copyright file="ucmeter.cs">
7 // copyright by huang zhenghui(黄正辉) all, qq group:568015492 qq:623128629 email:623128629@qq.com
8 // </copyright>
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 /// <summary>
28 /// class ucmeter.
29 /// implements the <see cref="system.windows.forms.usercontrol" />
30 /// </summary>
31 /// <seealso cref="system.windows.forms.usercontrol" />
32 public class ucmeter : usercontrol
33 {
34 private int splitcount = 10;
35 /// <summary>
36 /// gets or sets the split count.
37 /// </summary>
38 /// <value>the split count.</value>
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 /// <summary>
54 /// gets or sets the meter degrees.
55 /// </summary>
56 /// <value>the meter degrees.</value>
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 /// <summary>
72 /// gets or sets the minimum value.
73 /// </summary>
74 /// <value>the minimum value.</value>
75 [description("最小值,<maxvalue"), category("自定义")]
76 public decimal minvalue
77 {
78 get { return minvalue; }
79 set
80 {
81 if (value >= maxvalue)
82 return;
83 minvalue = value;
84 refresh();
85 }
86 }
87
88 private decimal maxvalue = 100;
89 /// <summary>
90 /// gets or sets the maximum value.
91 /// </summary>
92 /// <value>the maximum value.</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 /// <summary>
106 /// 获取或设置控件显示的文字的字体。
107 /// </summary>
108 /// <value>the font.</value>
109 /// <permissionset>
110 /// <ipermission class="system.security.permissions.environmentpermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
111 /// <ipermission class="system.security.permissions.fileiopermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
112 /// <ipermission class="system.security.permissions.securitypermission, mscorlib, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" flags="unmanagedcode, controlevidence" />
113 /// <ipermission class="system.diagnostics.performancecounterpermission, system, version=2.0.3600.0, culture=neutral, publickeytoken=b77a5c561934e089" version="1" unrestricted="true" />
114 /// </permissionset>
115 [description("刻度字体"), category("自定义")]
116 public override font font
117 {
118 get
119 {
120 return base.font;
121 }
122 set
123 {
124 base.font = value;
125 refresh();
126 }
127 }
128
129 private decimal m_value = 0;
130 /// <summary>
131 /// gets or sets the value.
132 /// </summary>
133 /// <value>the value.</value>
134 [description("值，>=minvalue并且<=maxvalue"), category("自定义")]
135 public decimal value
136 {
137 get { return m_value; }
138 set
139 {
140 if (value < minvalue || value > maxvalue)
141 return;
142 m_value = value;
143 refresh();
144 }
145 }
146
147 private metertextlocation textlocation = metertextlocation.none;
148 /// <summary>
149 /// gets or sets the text location.
150 /// </summary>
151 /// <value>the text location.</value>
152 [description("值和固定文字显示位置"), category("自定义")]
153 public metertextlocation textlocation
154 {
155 get { return textlocation; }
156 set
157 {
158 textlocation = value;
159 refresh();
160 }
161 }
162
163 private string fixedtext;
164 /// <summary>
165 /// gets or sets the fixed text.
166 /// </summary>
167 /// <value>the fixed text.</value>
168 [description("固定文字"), category("自定义")]
169 public string fixedtext
170 {
171 get { return fixedtext; }
172 set
173 {
174 fixedtext = value;
175 refresh();
176 }
177 }
178
179 private font textfont = defaultfont;
180 /// <summary>
181 /// gets or sets the text font.
182 /// </summary>
183 /// <value>the text font.</value>
184 [description("值和固定文字字体"), category("自定义")]
185 public font textfont
186 {
187 get { return textfont; }
188 set
189 {
190 textfont = value;
191 refresh();
192 }
193 }
194
195 private color externalroundcolor = color.fromargb(255, 77, 59);
196 /// <summary>
197 /// gets or sets the color of the external round.
198 /// </summary>
199 /// <value>the color of the external round.</value>
200 [description("外圆颜色"), category("自定义")]
201 public color externalroundcolor
202 {
203 get { return externalroundcolor; }
204 set
205 {
206 externalroundcolor = value;
207 refresh();
208 }
209 }
210
211 private color insideroundcolor = color.fromargb(255, 77, 59);
212 /// <summary>
213 /// gets or sets the color of the inside round.
214 /// </summary>
215 /// <value>the color of the inside round.</value>
216 [description("内圆颜色"), category("自定义")]
217 public color insideroundcolor
218 {
219 get { return insideroundcolor; }
220 set
221 {
222 insideroundcolor = value;
223 refresh();
224 }
225 }
226
227 private color boundarylinecolor = color.fromargb(255, 77, 59);
228 /// <summary>
229 /// gets or sets the color of the boundary line.
230 /// </summary>
231 /// <value>the color of the boundary line.</value>
232 [description("边界线颜色"), category("自定义")]
233 public color boundarylinecolor
234 {
235 get { return boundarylinecolor; }
236 set
237 {
238 boundarylinecolor = value;
239 refresh();
240 }
241 }
242
243 private color scalecolor = color.fromargb(255, 77, 59);
244 /// <summary>
245 /// gets or sets the color of the scale.
246 /// </summary>
247 /// <value>the color of the scale.</value>
248 [description("刻度颜色"), category("自定义")]
249 public color scalecolor
250 {
251 get { return scalecolor; }
252 set
253 {
254 scalecolor = value;
255 refresh();
256 }
257 }
258
259 private color scalevaluecolor = color.fromargb(255, 77, 59);
260 /// <summary>
261 /// gets or sets the color of the scale value.
262 /// </summary>
263 /// <value>the color of the scale value.</value>
264 [description("刻度值文字颜色"), category("自定义")]
265 public color scalevaluecolor
266 {
267 get { return scalevaluecolor; }
268 set
269 {
270 scalevaluecolor = value;
271 refresh();
272 }
273 }
274
275 private color pointercolor = color.fromargb(255, 77, 59);
276 /// <summary>
277 /// gets or sets the color of the pointer.
278 /// </summary>
279 /// <value>the color of the pointer.</value>
280 [description("指针颜色"), category("自定义")]
281 public color pointercolor
282 {
283 get { return pointercolor; }
284 set
285 {
286 pointercolor = value;
287 refresh();
288 }
289 }
290
291 private color textcolor = color.fromargb(255, 77, 59);
292 /// <summary>
293 /// gets or sets the color of the text.
294 /// </summary>
295 /// <value>the color of the text.</value>
296 [description("值和固定文字颜色"), category("自定义")]
297 public color textcolor
298 {
299 get { return textcolor; }
300 set
301 {
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 else
380 {
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 /// <summary>
417 /// enum metertextlocation
418 /// </summary>
419 public enum metertextlocation
420 {
421 /// <summary>
422 /// the none
423 /// </summary>
424 none,
425 /// <summary>
426 /// the top
427 /// </summary>
428 top,
429 /// <summary>
430 /// the bottom
431 /// </summary>
432 bottom
433 }
434 }
最后的话
如果你喜欢的话，请到 点个星星吧
上一篇： WinForm任务栏最小化