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 = 400;    const int PIE_DIAMETER = 200;    DataTable dt = chartData.Tables[0];       //通过输入参数，取得饼图中的总基数    float sumData = http://www.mamicode.com/0; "Tahoma",14),Brushes.Black,new PointF(5,5));    //画饼图的图例    g.DrawString(subTitle,new Font("Tahoma",12),Brushes.Black,new PointF(7,35));    //画饼图    float curAngle = 0;    float totalAngle = 0;    for(int i=0;i<dt.Rows.Count;i++)    {     curAngle = Convert.ToSingle(dt.Rows[i][DataLine]) / sumData * 360;        g.FillPie(new SolidBrush(ChartUtil.GetChartItemColor(i)),100,65,PIE_DIAMETER,PIE_DIAMETER,totalAngle,curAngle);     g.DrawPie(Pens.Black,100,65,PIE_DIAMETER,PIE_DIAMETER,totalAngle,curAngle);     totalAngle += curAngle;    }    //画图例框及其文字    g.DrawRectangle(Pens.Black,200,300,199,99);    g.DrawString("图表说明",new Font("Tahoma",12,FontStyle.Bold),Brushes.Black,new PointF(200,300));       //画图例各项    PointF boxOrigin = new PointF(210,330);    PointF textOrigin = new PointF(235,326);    float percent = 0;    for(int i=0;i<dt.Rows.Count;i++)    {     g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)),boxOrigin.X,boxOrigin.Y,20,10);     g.DrawRectangle(Pens.Black,boxOrigin.X,boxOrigin.Y,20,10);     percent = Convert.ToSingle(dt.Rows[i][DataLine]) / sumData * 100;     g.DrawString(dt.Rows[i][1].ToString() + " - " + dt.Rows[i][0].ToString() + " (" + percent.ToString("0") + "%)",new Font("Tahoma",10),Brushes.Black,textOrigin);     boxOrigin.Y += 15;     textOrigin.Y += 15;    }    //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 = 400;    const int CHART_TOP = 75;    const int CHART_HEIGHT = 200;    const int CHART_LEFT = 50;    const int CHART_WIDTH = 300;    DataTable dt = chartData.Tables[0];       //计算最高的点    float highPoint = 0;    foreach(DataRow dr in dt.Rows)    {     if(highPoint<Convert.ToSingle(dr[0]))     {      highPoint = Convert.ToSingle(dr[0]);  }    }    //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,0,0,SIDE_LENGTH-1,SIDE_LENGTH-1);     //画大标题     g.DrawString(title,new Font("Tahoma",14),Brushes.Black,new PointF(5,5));     //画小标题     g.DrawString(subTitle,new Font("Tahoma",12),Brushes.Black,new PointF(7,35));     //画条形图     float barWidth = CHART_WIDTH / (dt.Rows.Count * 2);     PointF barOrigin = new PointF(CHART_LEFT + (barWidth / 2),0);     float barHeight = dt.Rows.Count;     for(int i=0;i<dt.Rows.Count;i++)     {      barHeight = Convert.ToSingle(dt.Rows[i][0]) * 200 / highPoint * 1;      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 * 2);     }     //设置边     g.DrawLine(new Pen(Color.Black,2),new Point(CHART_LEFT,CHART_TOP),new Point(CHART_LEFT,CHART_TOP + CHART_HEIGHT));     g.DrawLine(new Pen(Color.Black,2),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,1),200,300,199,99);     g.DrawString("图表说明",new Font("Tahoma",12,FontStyle.Bold),Brushes.Black,new PointF(200,300));        //画图例     PointF boxOrigin = new PointF(210,330);     PointF textOrigin = new PointF(235,326);     for(int i=0;i<dt.Rows.Count;i++)     {      g.FillRectangle(new SolidBrush(ChartUtil.GetChartItemColor(i)),boxOrigin.X,boxOrigin.Y,20,10);      g.DrawRectangle(Pens.Black,boxOrigin.X,boxOrigin.Y,20,10);      g.DrawString(dt.Rows[i][1].ToString() + " - " + dt.Rows[i][0].ToString(),new Font("Tahoma",10),Brushes.Black,textOrigin);      boxOrigin.Y += 15;      textOrigin.Y += 15;     }     //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 0:      selectedColor = Color.Blue;      break;     case 1:      selectedColor = Color.Red;      break;     case 2:      selectedColor = Color.Yellow;      break;     case 3:      selectedColor = Color.Purple;      break;     default:      selectedColor = Color.Green;      break;    }    return selectedColor;   }  } }