C#的WinForm中制作饼状图和柱状图

using System;

using System.IO;//用于文件存取

using System.Data;//用于数据访问

using System.Drawing;//提供画GDI+图形的基本功能

using System.Drawing.Text;//提供画GDI+图形的高级功能

using System.Drawing.Drawing2D;//提供画高级二维，矢量图形功能

using System.Drawing.Imaging;//提供画GDI+图形的高级功能

namespace BaseLayer

{

 public class PieChart

 {

  public PieChart()

  {

  }

//Render是图形大标题，图开小标题，图形宽度，图形长度，饼图的数据集和饼图的数据集要表示出来的数据

  public Image Render(string title, string subTitle, int width, int height, DataSet chartData,int DataLine)

  {

   const int SIDE_LENGTH = ;

   const int PIE_DIAMETER = ;

   DataTable dt = chartData.Tables[];

   //通过输入参数，取得饼图中的总基数

   float sumData = ;

   foreach(DataRow dr in dt.Rows)

   {

    sumData += Convert.ToSingle(dr[DataLine]);

   }

   //产生一个image对象，并由此产生一个Graphics对象

   Bitmap bm = new Bitmap(width,height);

   Graphics g = Graphics.FromImage(bm);

   //设置对象g的属性

   g.ScaleTransform((Convert.ToSingle(width))/SIDE_LENGTH,(Convert.ToSingle(height))/SIDE_LENGTH);

   g.SmoothingMode = SmoothingMode.Default;

   g.TextRenderingHint = TextRenderingHint.AntiAlias;

   //画布和边的设定

   g.Clear(Color.White);

   g.DrawRectangle(Pens.Black,,,SIDE_LENGTH-,SIDE_LENGTH-);

   //画饼图标题

   g.DrawString(title,new Font("Tahoma",),Brushes.Black,new PointF(,));

   //画饼图的图例

   g.DrawString(subTitle,new Font("Tahoma",),Brushes.Black,new PointF(,));

   //画饼图

   float curAngle = ;

   float totalAngle = ;

   for(int i=;i<dt.Rows.Count;i++)

   {

    curAngle = Convert.ToSingle(dt.Rows[i][DataLine]) / sumData * ;

    g.FillPie(new SolidBrush(ChartUtil.GetChartItemColor(i)),,,PIE_DIAMETER,PIE_DIAMETER,totalAngle,curAngle);

    g.DrawPie(Pens.Black,,,PIE_DIAMETER,PIE_DIAMETER,totalAngle,curAngle);

    totalAngle += curAngle;

   }

   //画图例框及其文字

   g.DrawRectangle(Pens.Black,,,,);

   g.DrawString("图表说明",new Font("Tahoma",,FontStyle.Bold),Brushes.Black,new PointF(,));

   //画图例各项

   PointF boxOrigin = new PointF(,);

   PointF textOrigin = new PointF(,);

   float percent = ;

   for(int i=;i<dt.Rows.Count;i++)

   {

    g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)),boxOrigin.X,boxOrigin.Y,,);

    g.DrawRectangle(Pens.Black,boxOrigin.X,boxOrigin.Y,,);

    percent = Convert.ToSingle(dt.Rows[i][DataLine]) / sumData * ;

    g.DrawString(dt.Rows[i][].ToString() + " - " + dt.Rows[i][].ToString() + " (" + percent.ToString("") + "%)",new Font("Tahoma",),Brushes.Black,textOrigin);

    boxOrigin.Y += ;

    textOrigin.Y += ;

   }

   //回收资源

   g.Dispose();

   return (Image) bm;

  }

 }

 //画条形图

 public class BarChart

 {

  public BarChart()

  {

  }

//Render是图形大标题，图开小标题，图形宽度，图形长度，饼图的数据集和饼图的数据集

  public Image Render(string title, string subTitle, int width, int height, DataSet chartData)

  {

   const int SIDE_LENGTH = ;

   const int CHART_TOP = ;

   const int CHART_HEIGHT = ;

   const int CHART_LEFT = ;

   const int CHART_WIDTH = ;

   DataTable dt = chartData.Tables[];

   //计算最高的点

   float highPoint = ;

   foreach(DataRow dr in dt.Rows)

   {

    if(highPoint<Convert.ToSingle(dr[]))

    {

     highPoint = Convert.ToSingle(dr[]);

 }

   }

   //建立一个Graphics对象实例

   Bitmap bm = new Bitmap(width,height);

   try

   {

    Graphics g = Graphics.FromImage(bm);

    //设置条图图形和文字属性

    g.ScaleTransform((Convert.ToSingle(width))/SIDE_LENGTH,(Convert.ToSingle(height))/SIDE_LENGTH);

    g.SmoothingMode = SmoothingMode.Default;

    g.TextRenderingHint = TextRenderingHint.AntiAlias;

    //设定画布和边

    g.Clear(Color.White);

    g.DrawRectangle(Pens.Black,,,SIDE_LENGTH-,SIDE_LENGTH-);

    //画大标题

    g.DrawString(title,new Font("Tahoma",),Brushes.Black,new PointF(,));

    //画小标题

    g.DrawString(subTitle,new Font("Tahoma",),Brushes.Black,new PointF(,));

    //画条形图

    float barWidth = CHART_WIDTH / (dt.Rows.Count * );

    PointF barOrigin = new PointF(CHART_LEFT + (barWidth / ),);

    float barHeight = dt.Rows.Count;

    for(int i=;i<dt.Rows.Count;i++)

    {

     barHeight = Convert.ToSingle(dt.Rows[i][]) *  / highPoint * ;

     barOrigin.Y = CHART_TOP + CHART_HEIGHT - barHeight;

     g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)),barOrigin.X,barOrigin.Y,barWidth,barHeight);

     barOrigin.X = barOrigin.X + (barWidth * );

    }

    //设置边

    g.DrawLine(new Pen(Color.Black,),new Point(CHART_LEFT,CHART_TOP),new Point(CHART_LEFT,CHART_TOP + CHART_HEIGHT));

    g.DrawLine(new Pen(Color.Black,),new Point(CHART_LEFT,CHART_TOP + CHART_HEIGHT),new Point(CHART_LEFT + CHART_WIDTH,CHART_TOP + CHART_HEIGHT));

    //画图例框和文字

    g.DrawRectangle(new Pen(Color.Black,),,,,);

    g.DrawString("图表说明",new Font("Tahoma",,FontStyle.Bold),Brushes.Black,new PointF(,));

    //画图例

    PointF boxOrigin = new PointF(,);

    PointF textOrigin = new PointF(,);

    for(int i=;i<dt.Rows.Count;i++)

    {

     g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)),boxOrigin.X,boxOrigin.Y,,);

     g.DrawRectangle(Pens.Black,boxOrigin.X,boxOrigin.Y,,);

     g.DrawString(dt.Rows[i][].ToString() + " - " + dt.Rows[i][].ToString(),new Font("Tahoma",),Brushes.Black,textOrigin);

     boxOrigin.Y += ;

     textOrigin.Y += ;

    }

    //输出图形

    g.Dispose();

    return bm;

   }

   catch

   {

    return bm;

   }

  }

 }

 public class ChartUtil

 {

  public ChartUtil()

  {

  }

  public static Color GetChartItemColor(int itemIndex)

  {

   Color selectedColor;

   switch(itemIndex)

   {

    case :

     selectedColor = Color.Blue;

     break;

    case :

     selectedColor = Color.Red;

     break;

    case :

     selectedColor = Color.Yellow;

     break;

    case :

     selectedColor = Color.Purple;

     break;

    default:

     selectedColor = Color.Green;

     break;

   }

   return selectedColor;

  }

 }

}