（七十）c#Winform自定义控件-饼状图
Posted bfyx
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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://www.cnblogs.com/bfyx/p/11364884.html
用处及效果
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
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