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;
  }
 }
}