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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;//ÓÃÓÚÊý¾Ý·ÃÎÊ
using System.Drawing;//Ìṩ»­GDI+ͼÐεĻù±¾¹¦ÄÜ
using System.Drawing.Text;//Ìṩ»­GDI+ͼÐεĸ߼¶¹¦ÄÜ
using System.Drawing.Drawing2D;//Ìṩ»­¸ß¼¶¶þά£¬Ê¸Á¿Í¼Ðι¦ÄÜ
using System.Drawing.Imaging;
using System.IO;//Ìṩ»­GDI+ͼÐεĸ߼¶¹¦ÄÜ
namespace Insight_cs.WebCharts
{
    public class BarChart
    {
        public BarChart()
        {
        }
        public void Render(string title, string subTitle, int width, int height, DataSet chartData, Stream target)
        {
            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];
            //¼ÆËã×î¸ßµÄµã
            float highPoint = 0; //yÖá×î¸ßµã
            foreach (DataRow dr in dt.Rows)
            {
    


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