（七十）c#Winform自定义控件-饼状图
·
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。
官网：https://www.hzhcontrols.cn
GitHub：https://github.com/kwwwvagaa/NetWinformControl
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
c#Winform自定义控件-目录_c#winform自定义控件-有图标的按钮-CSDN博客
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
// ***********************************************************************
// Assembly : HZH_Controls
// Created : 2019-09-23
//
// ***********************************************************************
// <copyright file="UCPieChart.cs">
// Copyright by Huang Zhenghui(黄正辉) All, QQ group:568015492 QQ:623128629 Email:623128629@qq.com
// </copyright>
//
// Blog: https://www.cnblogs.com/bfyx
// GitHub：https://github.com/kwwwvagaa/NetWinformControl
// gitee：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
//
// If you use this code, please keep this note.
// ***********************************************************************
using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Linq;
using System.Windows.Forms;
namespace HZH_Controls.Controls
{
/// <summary>
/// Class UCPieChart.
/// Implements the <see cref="System.Windows.Forms.UserControl" />
/// </summary>
/// <seealso cref="System.Windows.Forms.UserControl" />
public class UCPieChart : UserControl
{
/// <summary>
/// The pie items
/// </summary>
private PieItem[] pieItems = new PieItem[0];
/// <summary>
/// The random
/// </summary>
private Random random = null;
/// <summary>
/// The format center
/// </summary>
private StringFormat formatCenter = null;
/// <summary>
/// The margin
/// </summary>
private int margin = 50;
/// <summary>
/// The m is render percent
/// </summary>
private bool m_IsRenderPercent = false;
/// <summary>
/// The percen format
/// </summary>
private string percenFormat = "{0:F2}%";
/// <summary>
/// The components
/// </summary>
private IContainer components = null;
/// <summary>
/// Gets or sets a value indicating whether this instance is render percent.
/// </summary>
/// <value><c>true</c> if this instance is render percent; otherwise, <c>false</c>.</value>
[Browsable(true)]
[Category("自定义")]
[DefaultValue(false)]
[Description("获取或设置是否显示百分比占用")]
public bool IsRenderPercent
{
get
{
return m_IsRenderPercent;
}
set
{
m_IsRenderPercent = value;
Invalidate();
}
}
/// <summary>
/// Gets or sets the text margin.
/// </summary>
/// <value>The text margin.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置文本距离，单位为像素，默认50")]
[DefaultValue(50)]
public int TextMargin
{
get
{
return margin;
}
set
{
margin = value;
Invalidate();
}
}
/// <summary>
/// Gets or sets the percent format.
/// </summary>
/// <value>The percent format.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置文百分比文字的格式化信息")]
[DefaultValue("{0:F2}%")]
public string PercentFormat
{
get
{
return percenFormat;
}
set
{
percenFormat = value;
Invalidate();
}
}
/// <summary>
/// The center of circle color
/// </summary>
private Color centerOfCircleColor = Color.White;
/// <summary>
/// Gets or sets the color of the center of circle.
/// </summary>
/// <value>The color of the center of circle.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置圆心颜色")]
public Color CenterOfCircleColor
{
get { return centerOfCircleColor; }
set
{
centerOfCircleColor = value;
Invalidate();
}
}
/// <summary>
/// The center of circle width
/// </summary>
private int centerOfCircleWidth = 0;
/// <summary>
/// Gets or sets the width of the center of circle.
/// </summary>
/// <value>The width of the center of circle.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置圆心宽度")]
public int CenterOfCircleWidth
{
get { return centerOfCircleWidth; }
set
{
if (value < 0)
return;
centerOfCircleWidth = value;
Invalidate();
}
}
/// <summary>
/// The title
/// </summary>
private string title;
/// <summary>
/// Gets or sets the ti tle.
/// </summary>
/// <value>The ti tle.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置标题")]
public string TiTle
{
get { return title; }
set
{
title = value;
ResetTitleHeight();
Invalidate();
}
}
/// <summary>
/// The title font
/// </summary>
private Font titleFont = new Font("微软雅黑", 12);
/// <summary>
/// Gets or sets the title font.
/// </summary>
/// <value>The title font.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置标题字体")]
public Font TitleFont
{
get { return titleFont; }
set
{
titleFont = value;
ResetTitleHeight();
Invalidate();
}
}
/// <summary>
/// The title froe color
/// </summary>
private Color titleFroeColor = Color.Black;
/// <summary>
/// Gets or sets the color of the title froe.
/// </summary>
/// <value>The color of the title froe.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置标题颜色")]
public Color TitleFroeColor
{
get { return titleFroeColor; }
set
{
titleFroeColor = value;
Invalidate();
}
}
/// <summary>
/// The title size
/// </summary>
private SizeF titleSize = SizeF.Empty;
/// <summary>
/// Resets the height of the title.
/// </summary>
private void ResetTitleHeight()
{
if (string.IsNullOrEmpty(title))
titleSize = SizeF.Empty;
else
{
using (var g = this.CreateGraphics())
{
titleSize = g.MeasureString(title, titleFont);
}
}
}
/// <summary>
/// Gets or sets the data source.
/// </summary>
/// <value>The data source.</value>
[Browsable(true)]
[Category("自定义")]
[Description("获取或设置标题颜色")]
[Localizable(true)]
public PieItem[] DataSource
{
get { return pieItems; }
set
{
pieItems = value;
Invalidate();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="UCPieChart"/> class.
/// </summary>
public UCPieChart()
{
InitializeComponent();
random = new Random();
formatCenter = new StringFormat();
formatCenter.Alignment = StringAlignment.Center;
formatCenter.LineAlignment = StringAlignment.Center;
SetStyle(ControlStyles.UserPaint | ControlStyles.SupportsTransparentBackColor, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
pieItems = new PieItem[0];
if (GetService(typeof(IDesignerHost)) != null || LicenseManager.UsageMode == LicenseUsageMode.Designtime)
{
pieItems = new PieItem[5];
for (int i = 0; i < 5; i++)
{
pieItems[i] = new PieItem
{
Name = "Source" + (i + 1),
Value = random.Next(10, 100)
};
}
}
}
/// <summary>
/// Gets the center point.
/// </summary>
/// <param name="width">The width.</param>
/// <returns>Point.</returns>
private Point GetCenterPoint(out int width)
{
width = Math.Min(base.Width, base.Height - (titleSize != SizeF.Empty ? ((int)titleSize.Height) : 0)) / 2 - margin - 8;
return new Point(base.Width / 2 - 1, base.Height / 2 + (titleSize != SizeF.Empty ? ((int)titleSize.Height) : 0) - 1);
}
/// <summary>
/// 引发 <see cref="E:System.Windows.Forms.Control.Paint" /> 事件。
/// </summary>
/// <param name="e">包含事件数据的 <see cref="T:System.Windows.Forms.PaintEventArgs" />。</param>
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.SetGDIHigh();
int width;
Point centerPoint = GetCenterPoint(out width);
Rectangle rectangle = new Rectangle(centerPoint.X - width, centerPoint.Y - width, width * 2, width * 2);
if (width > 0 && pieItems.Length != 0)
{
if (!string.IsNullOrEmpty(title))
e.Graphics.DrawString(title, titleFont, new SolidBrush(titleFroeColor), new PointF((this.Width - titleSize.Width) / 2, 5));
Rectangle rect = new Rectangle(rectangle.X - centerPoint.X, rectangle.Y - centerPoint.Y, rectangle.Width, rectangle.Height);
e.Graphics.TranslateTransform(centerPoint.X, centerPoint.Y);
e.Graphics.RotateTransform(90f);
int num = pieItems.Sum((PieItem item) => item.Value);
float num2 = 0f;
float num3 = -90f;
for (int i = 0; i < pieItems.Length; i++)
{
Color cItem = pieItems[i].PieColor ?? ControlHelper.Colors[i];
Pen pen = new Pen(cItem, 1f);
SolidBrush solidBrush = new SolidBrush(cItem);
SolidBrush solidBrush2 = new SolidBrush(cItem);
Brush percentBrush = new SolidBrush(cItem);
float num4 = e.Graphics.MeasureString(pieItems[i].Name, Font).Width + 3f;
float num5 = (num != 0) ? Convert.ToSingle((double)pieItems[i].Value * 1.0 / (double)num * 360.0) : ((float)(360 / pieItems.Length));
e.Graphics.FillPie(solidBrush, rect, 0f, 0f - num5);
e.Graphics.DrawPie(new Pen(solidBrush), rect, 0f, 0f - num5);
e.Graphics.RotateTransform(0f - num5 / 2f);
if (num5 < 2f)
{
num2 += num5;
}
else
{
num2 += num5 / 2f;
int num6 = 15;
if (num2 < 45f || num2 > 315f)
{
num6 = 20;
}
if (num2 > 135f && num2 < 225f)
{
num6 = 20;
}
e.Graphics.DrawLine(pen, width * 2 / 3, 0, width + num6, 0);
e.Graphics.TranslateTransform(width + num6, 0f);
if (num2 - num3 < 5f)
{
}
num3 = num2;
if (num2 < 180f)
{
e.Graphics.RotateTransform(num2 - 90f);
e.Graphics.DrawLine(pen, 0f, 0f, num4, 0f);
e.Graphics.DrawString(pieItems[i].Name, Font, solidBrush2, new Point(0, -Font.Height));
if (IsRenderPercent)
{
e.Graphics.DrawString(string.Format(percenFormat, num5 * 100f / 360f), Font, percentBrush, new Point(0, 1));
}
e.Graphics.RotateTransform(90f - num2);
}
else
{
e.Graphics.RotateTransform(num2 - 270f);
e.Graphics.DrawLine(pen, 0f, 0f, num4, 0f);
e.Graphics.TranslateTransform(num4 - 3f, 0f);
e.Graphics.RotateTransform(180f);
e.Graphics.DrawString(pieItems[i].Name, Font, solidBrush2, new Point(0, -Font.Height));
if (IsRenderPercent)
{
e.Graphics.DrawString(string.Format(percenFormat, num5 * 100f / 360f), Font, percentBrush, new Point(0, 1));
}
e.Graphics.RotateTransform(-180f);
e.Graphics.TranslateTransform(0f - num4 + 3f, 0f);
e.Graphics.RotateTransform(270f - num2);
}
e.Graphics.TranslateTransform(-width - num6, 0f);
e.Graphics.RotateTransform(0f - num5 / 2f);
num2 += num5 / 2f;
}
solidBrush.Dispose();
pen.Dispose();
solidBrush2.Dispose();
percentBrush.Dispose();
}
e.Graphics.ResetTransform();
if (centerOfCircleWidth > 0)
{
Rectangle rectCenter = new Rectangle(rect.Left + rect.Width / 2 - centerOfCircleWidth / 2, rect.Top + rect.Height / 2 - centerOfCircleWidth / 2, centerOfCircleWidth, centerOfCircleWidth);
e.Graphics.FillEllipse(new SolidBrush(centerOfCircleColor), rectCenter);
}
}
else
{
e.Graphics.FillEllipse(Brushes.AliceBlue, rectangle);
e.Graphics.DrawEllipse(Pens.DodgerBlue, rectangle);
e.Graphics.DrawString("无数据", Font, Brushes.DimGray, rectangle, formatCenter);
}
base.OnPaint(e);
}
/// <summary>
/// Sets the data source.
/// </summary>
/// <param name="source">The source.</param>
public void SetDataSource(PieItem[] source)
{
if (source != null)
{
DataSource = source;
}
}
/// <summary>
/// Sets the data source.
/// </summary>
/// <param name="names">The names.</param>
/// <param name="values">The values.</param>
/// <exception cref="System.ArgumentNullException">
/// names
/// or
/// values
/// </exception>
/// <exception cref="System.Exception">两个数组的长度不一致！</exception>
public void SetDataSource(string[] names, int[] values)
{
if (names == null)
{
throw new ArgumentNullException("names");
}
if (values == null)
{
throw new ArgumentNullException("values");
}
if (names.Length != values.Length)
{
throw new Exception("两个数组的长度不一致！");
}
pieItems = new PieItem[names.Length];
for (int i = 0; i < names.Length; i++)
{
pieItems[i] = new PieItem
{
Name = names[i],
Value = values[i]
};
}
Invalidate();
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <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>
protected override void Dispose(bool disposing)
{
if (disposing && components != null)
{
components.Dispose();
}
base.Dispose(disposing);
}
/// <summary>
/// Initializes the component.
/// </summary>
private void InitializeComponent()
{
SuspendLayout();
base.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
BackColor = System.Drawing.Color.Transparent;
base.Name = "UCPieChart";
ResumeLayout(false);
}
}
}最后的话
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