（七十）c#Winform自定义控件-饼状图
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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
/// <summary>
/// The pie items
/// </summary>
private PieItem[] pieItems = new PieItem[]; /// <summary>
/// The random
/// </summary>
private Random random = null; /// <summary>
/// The format center
/// </summary>
private StringFormat formatCenter = null; /// <summary>
/// The margin
/// </summary>
private int margin = ; /// <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()]
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 = ;
/// <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 < )
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", );
/// <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();
}
}
重绘
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 * , width * );
if (width > && pieItems.Length != )
{
if (!string.IsNullOrEmpty(title))
e.Graphics.DrawString(title, titleFont, new SolidBrush(titleFroeColor), new PointF((this.Width - titleSize.Width) / , ));
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 = ; 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 != ) ? Convert.ToSingle((double)pieItems[i].Value * 1.0 / (double)num * 360.0) : ((float)( / 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 = ;
if (num2 < 45f || num2 > 315f)
{
num6 = ;
}
if (num2 > 135f && num2 < 225f)
{
num6 = ;
}
e.Graphics.DrawLine(pen, width * / , , width + num6, );
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(, -Font.Height));
if (IsRenderPercent)
{
e.Graphics.DrawString(string.Format(percenFormat, num5 * 100f / 360f), Font, percentBrush, new Point(, ));
}
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(, -Font.Height));
if (IsRenderPercent)
{
e.Graphics.DrawString(string.Format(percenFormat, num5 * 100f / 360f), Font, percentBrush, new Point(, ));
}
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 > )
{
Rectangle rectCenter = new Rectangle(rect.Left + rect.Width / - centerOfCircleWidth / , rect.Top + rect.Height / - centerOfCircleWidth / , 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);
}
一些辅助函数
/// <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 = ; i < names.Length; i++)
{
pieItems[i] = new PieItem
{
Name = names[i],
Value = values[i]
};
}
Invalidate();
}
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[]; /// <summary>
/// The random
/// </summary>
private Random random = null; /// <summary>
/// The format center
/// </summary>
private StringFormat formatCenter = null; /// <summary>
/// The margin
/// </summary>
private int margin = ; /// <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()]
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 = ;
/// <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 < )
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", );
/// <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[];
if (GetService(typeof(IDesignerHost)) != null || LicenseManager.UsageMode == LicenseUsageMode.Designtime)
{
pieItems = new PieItem[]; for (int i = ; i < ; i++)
{
pieItems[i] = new PieItem
{
Name = "Source" + (i + ),
Value = random.Next(, )
};
}
}
} /// <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) : )) / - margin - ;
return new Point(base.Width / - , base.Height / + (titleSize != SizeF.Empty ? ((int)titleSize.Height) : ) - );
} /// <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 * , width * );
if (width > && pieItems.Length != )
{
if (!string.IsNullOrEmpty(title))
e.Graphics.DrawString(title, titleFont, new SolidBrush(titleFroeColor), new PointF((this.Width - titleSize.Width) / , ));
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 = ; 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 != ) ? Convert.ToSingle((double)pieItems[i].Value * 1.0 / (double)num * 360.0) : ((float)( / 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 = ;
if (num2 < 45f || num2 > 315f)
{
num6 = ;
}
if (num2 > 135f && num2 < 225f)
{
num6 = ;
}
e.Graphics.DrawLine(pen, width * / , , width + num6, );
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(, -Font.Height));
if (IsRenderPercent)
{
e.Graphics.DrawString(string.Format(percenFormat, num5 * 100f / 360f), Font, percentBrush, new Point(, ));
}
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(, -Font.Height));
if (IsRenderPercent)
{
e.Graphics.DrawString(string.Format(percenFormat, num5 * 100f / 360f), Font, percentBrush, new Point(, ));
}
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 > )
{
Rectangle rectCenter = new Rectangle(rect.Left + rect.Width / - centerOfCircleWidth / , rect.Top + rect.Height / - centerOfCircleWidth / , 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 = ; 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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