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 = 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 = 0; 

   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,0,0,SIDE_LENGTH-1,SIDE_LENGTH-1); 

   //画饼图标题 

   g.DrawString(title,new Font("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; 

  } 

 } 

} 
复制代码

你可能感兴趣的:(WinForm)