欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

(七十)c#Winform自定义控件-饼状图

程序员文章站 2022-05-18 17:13:50
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

(七十)c#Winform自定义控件-饼状图

准备工作

使用gdi+画的控件,不了解可以先百度下

开始

添加一个类ucpiechart ,继承usercontrol

添加一些属性

  1  /// <summary>
  2         /// the pie items
  3         /// </summary>
  4         private pieitem[] pieitems = new pieitem[0];
  5 
  6         /// <summary>
  7         /// the random
  8         /// </summary>
  9         private random random = null;
 10 
 11         /// <summary>
 12         /// the format center
 13         /// </summary>
 14         private stringformat formatcenter = null;
 15 
 16         /// <summary>
 17         /// the margin
 18         /// </summary>
 19         private int margin = 50;
 20 
 21         /// <summary>
 22         /// the m is render percent
 23         /// </summary>
 24         private bool m_isrenderpercent = false;
 25 
 26         /// <summary>
 27         /// the percen format
 28         /// </summary>
 29         private string percenformat = "{0:f2}%";
 30 
 31         /// <summary>
 32         /// the components
 33         /// </summary>
 34         private icontainer components = null;
 35 
 36         /// <summary>
 37         /// gets or sets a value indicating whether this instance is render percent.
 38         /// </summary>
 39         /// <value><c>true</c> if this instance is render percent; otherwise, <c>false</c>.</value>
 40         [browsable(true)]
 41         [category("自定义")]
 42         [defaultvalue(false)]
 43         [description("获取或设置是否显示百分比占用")]
 44         public bool isrenderpercent
 45         {
 46             get
 47             {
 48                 return m_isrenderpercent;
 49             }
 50             set
 51             {
 52                 m_isrenderpercent = value;
 53                 invalidate();
 54             }
 55         }
 56 
 57 
 58         /// <summary>
 59         /// gets or sets the text margin.
 60         /// </summary>
 61         /// <value>the text margin.</value>
 62         [browsable(true)]
 63         [category("自定义")]
 64         [description("获取或设置文本距离,单位为像素,默认50")]
 65         [defaultvalue(50)]
 66         public int textmargin
 67         {
 68             get
 69             {
 70                 return margin;
 71             }
 72             set
 73             {
 74                 margin = value;
 75                 invalidate();
 76             }
 77         }
 78 
 79 
 80         /// <summary>
 81         /// gets or sets the percent format.
 82         /// </summary>
 83         /// <value>the percent format.</value>
 84         [browsable(true)]
 85         [category("自定义")]
 86         [description("获取或设置文百分比文字的格式化信息")]
 87         [defaultvalue("{0:f2}%")]
 88         public string percentformat
 89         {
 90             get
 91             {
 92                 return percenformat;
 93             }
 94             set
 95             {
 96                 percenformat = value;
 97                 invalidate();
 98             }
 99         }
100 
101         /// <summary>
102         /// the center of circle color
103         /// </summary>
104         private color centerofcirclecolor = color.white;
105         /// <summary>
106         /// gets or sets the color of the center of circle.
107         /// </summary>
108         /// <value>the color of the center of circle.</value>
109         [browsable(true)]
110         [category("自定义")]
111         [description("获取或设置圆心颜色")]
112         public color centerofcirclecolor
113         {
114             get { return centerofcirclecolor; }
115             set
116             {
117                 centerofcirclecolor = value;
118                 invalidate();
119             }
120         }
121 
122         /// <summary>
123         /// the center of circle width
124         /// </summary>
125         private int centerofcirclewidth = 0;
126         /// <summary>
127         /// gets or sets the width of the center of circle.
128         /// </summary>
129         /// <value>the width of the center of circle.</value>
130         [browsable(true)]
131         [category("自定义")]
132         [description("获取或设置圆心宽度")]
133         public int centerofcirclewidth
134         {
135             get { return centerofcirclewidth; }
136             set
137             {
138                 if (value < 0)
139                     return;
140                 centerofcirclewidth = value;
141                 invalidate();
142             }
143         }
144 
145         /// <summary>
146         /// the title
147         /// </summary>
148         private string title;
149         /// <summary>
150         /// gets or sets the ti tle.
151         /// </summary>
152         /// <value>the ti tle.</value>
153         [browsable(true)]
154         [category("自定义")]
155         [description("获取或设置标题")]
156         public string title
157         {
158             get { return title; }
159             set
160             {
161                 title = value;
162                 resettitleheight();
163                 invalidate();
164             }
165         }
166         /// <summary>
167         /// the title font
168         /// </summary>
169         private font titlefont = new font("微软雅黑", 12);
170         /// <summary>
171         /// gets or sets the title font.
172         /// </summary>
173         /// <value>the title font.</value>
174         [browsable(true)]
175         [category("自定义")]
176         [description("获取或设置标题字体")]
177         public font titlefont
178         {
179             get { return titlefont; }
180             set
181             {
182                 titlefont = value;
183                 resettitleheight();
184                 invalidate();
185             }
186         }
187 
188         /// <summary>
189         /// the title froe color
190         /// </summary>
191         private color titlefroecolor = color.black;
192         /// <summary>
193         /// gets or sets the color of the title froe.
194         /// </summary>
195         /// <value>the color of the title froe.</value>
196         [browsable(true)]
197         [category("自定义")]
198         [description("获取或设置标题颜色")]
199         public color titlefroecolor
200         {
201             get { return titlefroecolor; }
202             set
203             {
204                 titlefroecolor = value;
205                 invalidate();
206             }
207         }
208 
209         /// <summary>
210         /// the title size
211         /// </summary>
212         private sizef titlesize = sizef.empty;
213         /// <summary>
214         /// resets the height of the title.
215         /// </summary>
216         private void resettitleheight()
217         {
218             if (string.isnullorempty(title))
219                 titlesize = sizef.empty;
220             else
221             {
222                 using (var g = this.creategraphics())
223                 {
224                     titlesize = g.measurestring(title, titlefont);
225                 }
226             }
227         }
228 
229         /// <summary>
230         /// gets or sets the data source.
231         /// </summary>
232         /// <value>the data source.</value>
233         [browsable(true)]
234         [category("自定义")]
235         [description("获取或设置标题颜色")]
236         [localizable(true)]
237         public pieitem[] datasource
238         {
239             get { return pieitems; }
240             set
241             {
242                 pieitems = value;
243                 invalidate();
244             }
245         }

重绘

  1  protected override void onpaint(painteventargs e)
  2         {
  3             e.graphics.setgdihigh();
  4 
  5             int width;
  6             point centerpoint = getcenterpoint(out width);
  7             rectangle rectangle = new rectangle(centerpoint.x - width, centerpoint.y - width, width * 2, width * 2);
  8             if (width > 0 && pieitems.length != 0)
  9             {
 10                 if (!string.isnullorempty(title))
 11                     e.graphics.drawstring(title, titlefont, new solidbrush(titlefroecolor), new pointf((this.width - titlesize.width) / 2, 5));               
 12                 rectangle rect = new rectangle(rectangle.x - centerpoint.x, rectangle.y - centerpoint.y, rectangle.width, rectangle.height);
 13                 e.graphics.translatetransform(centerpoint.x, centerpoint.y);
 14                 e.graphics.rotatetransform(90f);
 15                 int num = pieitems.sum((pieitem item) => item.value);
 16                 float num2 = 0f;
 17                 float num3 = -90f;
 18                 for (int i = 0; i < pieitems.length; i++)
 19                 {
 20                     color citem = pieitems[i].piecolor ?? controlhelper.colors[i];
 21                     pen pen = new pen(citem, 1f);
 22                     solidbrush solidbrush = new solidbrush(citem);
 23                     solidbrush solidbrush2 = new solidbrush(citem);
 24                     brush percentbrush = new solidbrush(citem);
 25                     float num4 = e.graphics.measurestring(pieitems[i].name, font).width + 3f;
 26                     float num5 = (num != 0) ? convert.tosingle((double)pieitems[i].value * 1.0 / (double)num * 360.0) : ((float)(360 / pieitems.length));
 27                     e.graphics.fillpie(solidbrush, rect, 0f, 0f - num5);
 28                     e.graphics.drawpie(new pen(solidbrush), rect, 0f, 0f - num5);
 29                     e.graphics.rotatetransform(0f - num5 / 2f);
 30                     if (num5 < 2f)
 31                     {
 32                         num2 += num5;
 33                     }
 34                     else
 35                     {
 36                         num2 += num5 / 2f;
 37                         int num6 = 15;
 38                         if (num2 < 45f || num2 > 315f)
 39                         {
 40                             num6 = 20;
 41                         }
 42                         if (num2 > 135f && num2 < 225f)
 43                         {
 44                             num6 = 20;
 45                         }
 46                         e.graphics.drawline(pen, width * 2 / 3, 0, width + num6, 0);
 47                         e.graphics.translatetransform(width + num6, 0f);
 48                         if (num2 - num3 < 5f)
 49                         {
 50                         }
 51                         num3 = num2;
 52                         if (num2 < 180f)
 53                         {
 54                             e.graphics.rotatetransform(num2 - 90f);
 55                             e.graphics.drawline(pen, 0f, 0f, num4, 0f);
 56                             e.graphics.drawstring(pieitems[i].name, font, solidbrush2, new point(0, -font.height));
 57                             if (isrenderpercent)
 58                             {
 59                                 e.graphics.drawstring(string.format(percenformat, num5 * 100f / 360f), font, percentbrush, new point(0, 1));
 60                             }
 61                             e.graphics.rotatetransform(90f - num2);
 62                         }
 63                         else
 64                         {
 65                             e.graphics.rotatetransform(num2 - 270f);
 66                             e.graphics.drawline(pen, 0f, 0f, num4, 0f);
 67                             e.graphics.translatetransform(num4 - 3f, 0f);
 68                             e.graphics.rotatetransform(180f);
 69                             e.graphics.drawstring(pieitems[i].name, font, solidbrush2, new point(0, -font.height));
 70                             if (isrenderpercent)
 71                             {
 72                                 e.graphics.drawstring(string.format(percenformat, num5 * 100f / 360f), font, percentbrush, new point(0, 1));
 73                             }
 74                             e.graphics.rotatetransform(-180f);
 75                             e.graphics.translatetransform(0f - num4 + 3f, 0f);
 76                             e.graphics.rotatetransform(270f - num2);
 77                         }
 78                         e.graphics.translatetransform(-width - num6, 0f);
 79                         e.graphics.rotatetransform(0f - num5 / 2f);
 80                         num2 += num5 / 2f;
 81                     }
 82                     solidbrush.dispose();
 83                     pen.dispose();
 84                     solidbrush2.dispose();
 85                     percentbrush.dispose();
 86                 }
 87                 e.graphics.resettransform();
 88 
 89                 if (centerofcirclewidth > 0)
 90                 {
 91                     rectangle rectcenter = new rectangle(rect.left + rect.width / 2 - centerofcirclewidth / 2, rect.top + rect.height / 2 - centerofcirclewidth / 2, centerofcirclewidth, centerofcirclewidth);
 92                     e.graphics.fillellipse(new solidbrush(centerofcirclecolor), rectcenter);
 93                 }
 94             }
 95             else
 96             {
 97                 e.graphics.fillellipse(brushes.aliceblue, rectangle);
 98                 e.graphics.drawellipse(pens.dodgerblue, rectangle);
 99                 e.graphics.drawstring("无数据", font, brushes.dimgray, rectangle, formatcenter);
100             }
101             base.onpaint(e);
102         }

一些辅助函数

 1  /// <summary>
 2         /// sets the data source.
 3         /// </summary>
 4         /// <param name="source">the source.</param>
 5         public void setdatasource(pieitem[] source)
 6         {
 7             if (source != null)
 8             {
 9                 datasource = source;
10             }
11         }
12         /// <summary>
13         /// sets the data source.
14         /// </summary>
15         /// <param name="names">the names.</param>
16         /// <param name="values">the values.</param>
17         /// <exception cref="system.argumentnullexception">
18         /// names
19         /// or
20         /// values
21         /// </exception>
22         /// <exception cref="system.exception">两个数组的长度不一致!</exception>
23         public void setdatasource(string[] names, int[] values)
24         {
25             if (names == null)
26             {
27                 throw new argumentnullexception("names");
28             }
29             if (values == null)
30             {
31                 throw new argumentnullexception("values");
32             }
33             if (names.length != values.length)
34             {
35                 throw new exception("两个数组的长度不一致!");
36             }
37             pieitems = new pieitem[names.length];
38             for (int i = 0; i < names.length; i++)
39             {
40                 pieitems[i] = new pieitem
41                 {
42                     name = names[i],
43                     value = values[i]
44                 };
45             }
46             invalidate();
47         }

完整代码

  1 // ***********************************************************************
  2 // assembly         : hzh_controls
  3 // created          : 2019-09-23
  4 //
  5 // ***********************************************************************
  6 // <copyright file="ucpiechart.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.componentmodel;
 18 using system.componentmodel.design;
 19 using system.drawing;
 20 using system.drawing.drawing2d;
 21 using system.drawing.text;
 22 using system.linq;
 23 using system.windows.forms;
 24 
 25 namespace hzh_controls.controls
 26 {
 27     /// <summary>
 28     /// class ucpiechart.
 29     /// implements the <see cref="system.windows.forms.usercontrol" />
 30     /// </summary>
 31     /// <seealso cref="system.windows.forms.usercontrol" />
 32     public class ucpiechart : usercontrol
 33     {
 34         /// <summary>
 35         /// the pie items
 36         /// </summary>
 37         private pieitem[] pieitems = new pieitem[0];
 38 
 39         /// <summary>
 40         /// the random
 41         /// </summary>
 42         private random random = null;
 43 
 44         /// <summary>
 45         /// the format center
 46         /// </summary>
 47         private stringformat formatcenter = null;
 48 
 49         /// <summary>
 50         /// the margin
 51         /// </summary>
 52         private int margin = 50;
 53 
 54         /// <summary>
 55         /// the m is render percent
 56         /// </summary>
 57         private bool m_isrenderpercent = false;
 58 
 59         /// <summary>
 60         /// the percen format
 61         /// </summary>
 62         private string percenformat = "{0:f2}%";
 63 
 64         /// <summary>
 65         /// the components
 66         /// </summary>
 67         private icontainer components = null;
 68 
 69         /// <summary>
 70         /// gets or sets a value indicating whether this instance is render percent.
 71         /// </summary>
 72         /// <value><c>true</c> if this instance is render percent; otherwise, <c>false</c>.</value>
 73         [browsable(true)]
 74         [category("自定义")]
 75         [defaultvalue(false)]
 76         [description("获取或设置是否显示百分比占用")]
 77         public bool isrenderpercent
 78         {
 79             get
 80             {
 81                 return m_isrenderpercent;
 82             }
 83             set
 84             {
 85                 m_isrenderpercent = value;
 86                 invalidate();
 87             }
 88         }
 89 
 90 
 91         /// <summary>
 92         /// gets or sets the text margin.
 93         /// </summary>
 94         /// <value>the text margin.</value>
 95         [browsable(true)]
 96         [category("自定义")]
 97         [description("获取或设置文本距离,单位为像素,默认50")]
 98         [defaultvalue(50)]
 99         public int textmargin
100         {
101             get
102             {
103                 return margin;
104             }
105             set
106             {
107                 margin = value;
108                 invalidate();
109             }
110         }
111 
112 
113         /// <summary>
114         /// gets or sets the percent format.
115         /// </summary>
116         /// <value>the percent format.</value>
117         [browsable(true)]
118         [category("自定义")]
119         [description("获取或设置文百分比文字的格式化信息")]
120         [defaultvalue("{0:f2}%")]
121         public string percentformat
122         {
123             get
124             {
125                 return percenformat;
126             }
127             set
128             {
129                 percenformat = value;
130                 invalidate();
131             }
132         }
133 
134         /// <summary>
135         /// the center of circle color
136         /// </summary>
137         private color centerofcirclecolor = color.white;
138         /// <summary>
139         /// gets or sets the color of the center of circle.
140         /// </summary>
141         /// <value>the color of the center of circle.</value>
142         [browsable(true)]
143         [category("自定义")]
144         [description("获取或设置圆心颜色")]
145         public color centerofcirclecolor
146         {
147             get { return centerofcirclecolor; }
148             set
149             {
150                 centerofcirclecolor = value;
151                 invalidate();
152             }
153         }
154 
155         /// <summary>
156         /// the center of circle width
157         /// </summary>
158         private int centerofcirclewidth = 0;
159         /// <summary>
160         /// gets or sets the width of the center of circle.
161         /// </summary>
162         /// <value>the width of the center of circle.</value>
163         [browsable(true)]
164         [category("自定义")]
165         [description("获取或设置圆心宽度")]
166         public int centerofcirclewidth
167         {
168             get { return centerofcirclewidth; }
169             set
170             {
171                 if (value < 0)
172                     return;
173                 centerofcirclewidth = value;
174                 invalidate();
175             }
176         }
177 
178         /// <summary>
179         /// the title
180         /// </summary>
181         private string title;
182         /// <summary>
183         /// gets or sets the ti tle.
184         /// </summary>
185         /// <value>the ti tle.</value>
186         [browsable(true)]
187         [category("自定义")]
188         [description("获取或设置标题")]
189         public string title
190         {
191             get { return title; }
192             set
193             {
194                 title = value;
195                 resettitleheight();
196                 invalidate();
197             }
198         }
199         /// <summary>
200         /// the title font
201         /// </summary>
202         private font titlefont = new font("微软雅黑", 12);
203         /// <summary>
204         /// gets or sets the title font.
205         /// </summary>
206         /// <value>the title font.</value>
207         [browsable(true)]
208         [category("自定义")]
209         [description("获取或设置标题字体")]
210         public font titlefont
211         {
212             get { return titlefont; }
213             set
214             {
215                 titlefont = value;
216                 resettitleheight();
217                 invalidate();
218             }
219         }
220 
221         /// <summary>
222         /// the title froe color
223         /// </summary>
224         private color titlefroecolor = color.black;
225         /// <summary>
226         /// gets or sets the color of the title froe.
227         /// </summary>
228         /// <value>the color of the title froe.</value>
229         [browsable(true)]
230         [category("自定义")]
231         [description("获取或设置标题颜色")]
232         public color titlefroecolor
233         {
234             get { return titlefroecolor; }
235             set
236             {
237                 titlefroecolor = value;
238                 invalidate();
239             }
240         }
241 
242         /// <summary>
243         /// the title size
244         /// </summary>
245         private sizef titlesize = sizef.empty;
246         /// <summary>
247         /// resets the height of the title.
248         /// </summary>
249         private void resettitleheight()
250         {
251             if (string.isnullorempty(title))
252                 titlesize = sizef.empty;
253             else
254             {
255                 using (var g = this.creategraphics())
256                 {
257                     titlesize = g.measurestring(title, titlefont);
258                 }
259             }
260         }
261 
262         /// <summary>
263         /// gets or sets the data source.
264         /// </summary>
265         /// <value>the data source.</value>
266         [browsable(true)]
267         [category("自定义")]
268         [description("获取或设置标题颜色")]
269         [localizable(true)]
270         public pieitem[] datasource
271         {
272             get { return pieitems; }
273             set
274             {
275                 pieitems = value;
276                 invalidate();
277             }
278         }
279 
280         /// <summary>
281         /// initializes a new instance of the <see cref="ucpiechart"/> class.
282         /// </summary>
283         public ucpiechart()
284         {
285             initializecomponent();
286             random = new random();
287             formatcenter = new stringformat();
288             formatcenter.alignment = stringalignment.center;
289             formatcenter.linealignment = stringalignment.center;
290             setstyle(controlstyles.userpaint | controlstyles.supportstransparentbackcolor, true);
291             setstyle(controlstyles.resizeredraw, true);
292             setstyle(controlstyles.optimizeddoublebuffer, true);
293             setstyle(controlstyles.allpaintinginwmpaint, true);
294             pieitems = new pieitem[0];
295             if (getservice(typeof(idesignerhost)) != null || licensemanager.usagemode == licenseusagemode.designtime)
296             {
297                 pieitems = new pieitem[5];
298 
299                 for (int i = 0; i < 5; i++)
300                 {
301                     pieitems[i] = new pieitem
302                     {
303                         name = "source" + (i + 1),
304                         value = random.next(10, 100)
305                     };
306                 }
307             }
308         }
309 
310    
311 
312         /// <summary>
313         /// gets the center point.
314         /// </summary>
315         /// <param name="width">the width.</param>
316         /// <returns>point.</returns>
317         private point getcenterpoint(out int width)
318         {
319             width = math.min(base.width, base.height - (titlesize != sizef.empty ? ((int)titlesize.height) : 0)) / 2 - margin - 8;
320             return new point(base.width / 2 - 1, base.height / 2 + (titlesize != sizef.empty ? ((int)titlesize.height) : 0) - 1);
321         }
322 
323 
324         /// <summary>
325         /// 引发 <see cref="e:system.windows.forms.control.paint" /> 事件。
326         /// </summary>
327         /// <param name="e">包含事件数据的 <see cref="t:system.windows.forms.painteventargs" />。</param>
328         protected override void onpaint(painteventargs e)
329         {
330             e.graphics.setgdihigh();
331 
332             int width;
333             point centerpoint = getcenterpoint(out width);
334             rectangle rectangle = new rectangle(centerpoint.x - width, centerpoint.y - width, width * 2, width * 2);
335             if (width > 0 && pieitems.length != 0)
336             {
337                 if (!string.isnullorempty(title))
338                     e.graphics.drawstring(title, titlefont, new solidbrush(titlefroecolor), new pointf((this.width - titlesize.width) / 2, 5));               
339                 rectangle rect = new rectangle(rectangle.x - centerpoint.x, rectangle.y - centerpoint.y, rectangle.width, rectangle.height);
340                 e.graphics.translatetransform(centerpoint.x, centerpoint.y);
341                 e.graphics.rotatetransform(90f);
342                 int num = pieitems.sum((pieitem item) => item.value);
343                 float num2 = 0f;
344                 float num3 = -90f;
345                 for (int i = 0; i < pieitems.length; i++)
346                 {
347                     color citem = pieitems[i].piecolor ?? controlhelper.colors[i];
348                     pen pen = new pen(citem, 1f);
349                     solidbrush solidbrush = new solidbrush(citem);
350                     solidbrush solidbrush2 = new solidbrush(citem);
351                     brush percentbrush = new solidbrush(citem);
352                     float num4 = e.graphics.measurestring(pieitems[i].name, font).width + 3f;
353                     float num5 = (num != 0) ? convert.tosingle((double)pieitems[i].value * 1.0 / (double)num * 360.0) : ((float)(360 / pieitems.length));
354                     e.graphics.fillpie(solidbrush, rect, 0f, 0f - num5);
355                     e.graphics.drawpie(new pen(solidbrush), rect, 0f, 0f - num5);
356                     e.graphics.rotatetransform(0f - num5 / 2f);
357                     if (num5 < 2f)
358                     {
359                         num2 += num5;
360                     }
361                     else
362                     {
363                         num2 += num5 / 2f;
364                         int num6 = 15;
365                         if (num2 < 45f || num2 > 315f)
366                         {
367                             num6 = 20;
368                         }
369                         if (num2 > 135f && num2 < 225f)
370                         {
371                             num6 = 20;
372                         }
373                         e.graphics.drawline(pen, width * 2 / 3, 0, width + num6, 0);
374                         e.graphics.translatetransform(width + num6, 0f);
375                         if (num2 - num3 < 5f)
376                         {
377                         }
378                         num3 = num2;
379                         if (num2 < 180f)
380                         {
381                             e.graphics.rotatetransform(num2 - 90f);
382                             e.graphics.drawline(pen, 0f, 0f, num4, 0f);
383                             e.graphics.drawstring(pieitems[i].name, font, solidbrush2, new point(0, -font.height));
384                             if (isrenderpercent)
385                             {
386                                 e.graphics.drawstring(string.format(percenformat, num5 * 100f / 360f), font, percentbrush, new point(0, 1));
387                             }
388                             e.graphics.rotatetransform(90f - num2);
389                         }
390                         else
391                         {
392                             e.graphics.rotatetransform(num2 - 270f);
393                             e.graphics.drawline(pen, 0f, 0f, num4, 0f);
394                             e.graphics.translatetransform(num4 - 3f, 0f);
395                             e.graphics.rotatetransform(180f);
396                             e.graphics.drawstring(pieitems[i].name, font, solidbrush2, new point(0, -font.height));
397                             if (isrenderpercent)
398                             {
399                                 e.graphics.drawstring(string.format(percenformat, num5 * 100f / 360f), font, percentbrush, new point(0, 1));
400                             }
401                             e.graphics.rotatetransform(-180f);
402                             e.graphics.translatetransform(0f - num4 + 3f, 0f);
403                             e.graphics.rotatetransform(270f - num2);
404                         }
405                         e.graphics.translatetransform(-width - num6, 0f);
406                         e.graphics.rotatetransform(0f - num5 / 2f);
407                         num2 += num5 / 2f;
408                     }
409                     solidbrush.dispose();
410                     pen.dispose();
411                     solidbrush2.dispose();
412                     percentbrush.dispose();
413                 }
414                 e.graphics.resettransform();
415 
416                 if (centerofcirclewidth > 0)
417                 {
418                     rectangle rectcenter = new rectangle(rect.left + rect.width / 2 - centerofcirclewidth / 2, rect.top + rect.height / 2 - centerofcirclewidth / 2, centerofcirclewidth, centerofcirclewidth);
419                     e.graphics.fillellipse(new solidbrush(centerofcirclecolor), rectcenter);
420                 }
421             }
422             else
423             {
424                 e.graphics.fillellipse(brushes.aliceblue, rectangle);
425                 e.graphics.drawellipse(pens.dodgerblue, rectangle);
426                 e.graphics.drawstring("无数据", font, brushes.dimgray, rectangle, formatcenter);
427             }
428             base.onpaint(e);
429         }
430         /// <summary>
431         /// sets the data source.
432         /// </summary>
433         /// <param name="source">the source.</param>
434         public void setdatasource(pieitem[] source)
435         {
436             if (source != null)
437             {
438                 datasource = source;
439             }
440         }
441         /// <summary>
442         /// sets the data source.
443         /// </summary>
444         /// <param name="names">the names.</param>
445         /// <param name="values">the values.</param>
446         /// <exception cref="system.argumentnullexception">
447         /// names
448         /// or
449         /// values
450         /// </exception>
451         /// <exception cref="system.exception">两个数组的长度不一致!</exception>
452         public void setdatasource(string[] names, int[] values)
453         {
454             if (names == null)
455             {
456                 throw new argumentnullexception("names");
457             }
458             if (values == null)
459             {
460                 throw new argumentnullexception("values");
461             }
462             if (names.length != values.length)
463             {
464                 throw new exception("两个数组的长度不一致!");
465             }
466             pieitems = new pieitem[names.length];
467             for (int i = 0; i < names.length; i++)
468             {
469                 pieitems[i] = new pieitem
470                 {
471                     name = names[i],
472                     value = values[i]
473                 };
474             }
475             invalidate();
476         }
477 
478         /// <summary>
479         /// releases unmanaged and - optionally - managed resources.
480         /// </summary>
481         /// <param name="disposing">为 true 则释放托管资源和非托管资源;为 false 则仅释放非托管资源。</param>
482         protected override void dispose(bool disposing)
483         {
484             if (disposing && components != null)
485             {
486                 components.dispose();
487             }
488             base.dispose(disposing);
489         }
490 
491         /// <summary>
492         /// initializes the component.
493         /// </summary>
494         private void initializecomponent()
495         {
496             suspendlayout();
497             base.autoscalemode = system.windows.forms.autoscalemode.none;
498             backcolor = system.drawing.color.transparent;
499             base.name = "ucpiechart";
500             resumelayout(false);
501         }
502     }
503 }

 

最后的话

如果你喜欢的话,请到  点个星星吧