C#的WinForm中制作饼状图和柱状图

2020-12-13 03:07

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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