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