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
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Install-Package HZH_Controls
https://www.cnblogs.com/bfyx/p/11364884.html
使用GDI+画的控件，不了解可以先百度下
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 color103 /// </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 CenterOfCircleColor113 {114 get { return centerOfCircleColor; }115 set116 {117 centerOfCircleColor = value;118 Invalidate();119 }120 }121 122 /// <summary>123 /// The center of circle width124 /// </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 CenterOfCircleWidth134 {135 get { return centerOfCircleWidth; }136 set137 {138 if (value < 0)139 return;140 centerOfCircleWidth = value;141 Invalidate();142 }143 }144 145 /// <summary>146 /// The title147 /// </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 TiTle157 {158 get { return title; }159 set160 {161 title = value;162 ResetTitleHeight();163 Invalidate();164 }165 }166 /// <summary>167 /// The title font168 /// </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 TitleFont178 {179 get { return titleFont; }180 set181 {182 titleFont = value;183 ResetTitleHeight();184 Invalidate();185 }186 }187 188 /// <summary>189 /// The title froe color190 /// </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 TitleFroeColor200 {201 get { return titleFroeColor; }202 set203 {204 titleFroeColor = value;205 Invalidate();206 }207 }208 209 /// <summary>210 /// The title size211 /// </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 else221 {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[] DataSource238 {239 get { return pieItems; }240 set241 {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 /// names19 /// or20 /// values21 /// </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 PieItem41 {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 TextMargin100 {101 get102 {103 return margin;104 }105 set106 {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 PercentFormat122 {123 get124 {125 return percenFormat;126 }127 set128 {129 percenFormat = value;130 Invalidate();131 }132 }133 134 /// <summary>135 /// The center of circle color136 /// </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 CenterOfCircleColor146 {147 get { return centerOfCircleColor; }148 set149 {150 centerOfCircleColor = value;151 Invalidate();152 }153 }154 155 /// <summary>156 /// The center of circle width157 /// </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 CenterOfCircleWidth167 {168 get { return centerOfCircleWidth; }169 set170 {171 if (value < 0)172 return;173 centerOfCircleWidth = value;174 Invalidate();175 }176 }177 178 /// <summary>179 /// The title180 /// </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 TiTle190 {191 get { return title; }192 set193 {194 title = value;195 ResetTitleHeight();196 Invalidate();197 }198 }199 /// <summary>200 /// The title font201 /// </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 TitleFont211 {212 get { return titleFont; }213 set214 {215 titleFont = value;216 ResetTitleHeight();217 Invalidate();218 }219 }220 221 /// <summary>222 /// The title froe color223 /// </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 TitleFroeColor233 {234 get { return titleFroeColor; }235 set236 {237 titleFroeColor = value;238 Invalidate();239 }240 }241 242 /// <summary>243 /// The title size244 /// </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 else254 {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[] DataSource271 {272 get { return pieItems; }273 set274 {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 PieItem302 {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 else362 {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 else391 {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 else423 {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 /// names448 /// or449 /// values450 /// </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 PieItem470 {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 }
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