using System;using System.Collections;using System.Configuration;using System.Data;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;//添加画图类 using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.Drawing;using System.IO;using System.Data.SqlClient; using Com.LingHu.Db;public partial class quxiantu : System.Web.UI.Page{    SqlHelper sqlhelper = new SqlHelper();    protected void Page_Load(object sender, EventArgs e)    {        string sql = "";        string sql1 = "";        string sql2 = "";        if (Request.QueryString["type"].ToString() == "体重")        {            sql = "select Weight as testValue,Date as testDate from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql1 = "select min(Weight) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql2 = "select max(Weight) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";        }        else if (Request.QueryString["type"].ToString() == "体重指数")        {            sql = "select BMI as testValue,Date as testDate from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql1 = "select min(BMI) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql2 = "select max(BMI) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";        }        else if (Request.QueryString["type"].ToString() == "收缩压")        {            sql = "select BPss as testValue,Date as testDate from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql1 = "select min(BPss) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql2 = "select max(BPss) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";        }        else if (Request.QueryString["type"].ToString() == "舒张压")        {            sql = "select BPsz as testValue,Date as testDate from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql1 = "select min(BPsz) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql2 = "select max(BPsz) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";        }        else if (Request.QueryString["type"].ToString() == "体温")        {            sql = "select Temperature as testValue,Date as testDate from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql1 = "select min(Temperature) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql2 = "select max(Temperature) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";        }        else if (Request.QueryString["type"].ToString() == "空腹血糖")        {            sql = "select FPG as testValue,Date as testDate from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql1 = "select min(FPG) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";            sql2 = "select max(FPG) as testValue from PhysicalExam where userid = '" + Session["userid"].ToString() + "'";        }        string min = sqlhelper.GetDataSet(sql1).Tables[0].Rows[0]["testValue"].ToString().Trim();        string max = sqlhelper.GetDataSet(sql2).Tables[0].Rows[0]["testValue"].ToString().Trim();        Get_CurveData(sqlhelper.GetDataSet(sql).Tables[0], min, max);    }    //获取数据     public void Get_CurveData(DataTable dt,string minvalue,string maxvalue)    {        draw(dt,minvalue,maxvalue);    }    public void draw(DataTable dt, string minvalue, string maxvalue)    {        //取得记录数量         int count = dt.Rows.Count;        //记算图表宽度         int wd = 80 + 20 * (count - 1);        //设置最小宽度为800         if (wd < 600) wd = 600;        //生成Bitmap对像         Bitmap img = new Bitmap(wd, 400);        //生成绘图对像         Graphics g = Graphics.FromImage(img);        //定义黑色画笔         Pen Bp = new Pen(Color.Black);        //定义红色画笔         Pen Rp = new Pen(Color.Red);        //定义银灰色画笔         Pen Sp = new Pen(Color.Silver);        //定义大标题字体         Font Bfont = new Font("Arial", 12, FontStyle.Bold);        //定义一般字体         Font font = new Font("Arial", 6);        //定义大点的字体         Font Tfont = new Font("Arial", 9);        //定义横坐标间隔，(最佳值是总宽度-留空宽度[左右侧都需要])/(记录数量-1)         int xSpace = (wd - 100) / (count - 1);        //定义纵坐标间隔,不能随便修改，跟高度和横坐标线的条数有关，最佳值=(绘图的高度-上面留空-下面留空)         int ySpace = 30;        //纵坐标最大值和间隔值         int yMaxValue = Convert.ToInt32(maxvalue);        //绘制底色         g.DrawRectangle(new Pen(Color.White, 400), 0, 0, img.Width, img.Height);        //定义黑色过渡型笔刷         LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Black, Color.Black, 1.2F, true);        //定义蓝色过渡型笔刷         LinearGradientBrush Bluebrush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Blue, Color.Blue, 1.2F, true);        //绘制大标题         g.DrawString(Request.QueryString["type"].ToString()+"曲线图", Bfont, brush, 40, 5);        //绘制信息简报         string info = " 曲线图生成时间：" + DateTime.Now.ToString();        g.DrawString(info, Tfont, Bluebrush, 40, 25);        //绘制图片边框         g.DrawRectangle(Bp, 0, 0, img.Width - 1, img.Height - 1);        //绘制竖坐标轴         g.DrawLine(Bp, 40, 55, 40, 360);        //绘制横坐标轴 x2的60是右侧空出部分         g.DrawLine(Bp, 40, 360, 60 + xSpace * (count - 1), 360);        //绘制竖坐标标题         g.DrawString(Request.QueryString["type"].ToString(), Tfont, brush, 5, 40);        //绘制横坐标标题         g.DrawString("体检时间", Tfont, brush, 40, 385);        //绘制竖坐标线         for (int i = 0; i < count; i++)        {            g.DrawLine(Sp, 40 + xSpace * i, 60, 40 + xSpace * i, 360);        }        //绘制时间轴坐标标签         for (int i = 0; i < count; i++)        {            string st = dt.Rows[i]["testdate"].ToString().Substring(0,10);            g.DrawString(st, font, brush, 30 + xSpace * i, 370);        }        //绘制横坐标线         for (int i = 0; i < 10; i++)        {            g.DrawLine(Sp, 40, 60 + ySpace * i, 40 + xSpace * (count - 1), 60 + ySpace * i);            if (yMaxValue % 10 == 0)            {                //横坐标轴的值间隔是最大值除以间隔数                 int s = yMaxValue - i * (yMaxValue / 10);                //绘制发送量轴坐标标签                 g.DrawString(s.ToString(), font, brush, 10, 60 + ySpace * i);            }            else            {                //横坐标轴的值间隔是最大值除以间隔数                 double s = Convert.ToDouble(yMaxValue) - Convert.ToDouble(i) * (Convert.ToDouble(yMaxValue) / Convert.ToDouble(10));                //绘制发送量轴坐标标签                 g.DrawString(s.ToString(), font, brush, 10, 60 + ySpace * i);            }        }        //定义纵坐标单位数值=纵坐标最大值/标量最大值（360/yMaxValue*1.2）         double yAveValue = Convert.ToDouble(360) / Convert.ToDouble(yMaxValue*1.2);        //定义曲线转折点         Point[] p = new Point[count];        for (int i = 0; i < count; i++)        {            p[i].X = 40 + xSpace * i;            p[i].Y = Convert.ToInt32(Convert.ToDouble(360) - Convert.ToDouble(dt.Rows[i]["testvalue"]) * Convert.ToDouble(yAveValue));        }        //绘制折线图         //g.DrawLines(Rp, p);         //绘制曲线图         //g.DrawCurve(Rp, p);         //绘制自定义张力的曲线图（0.5F是张力值，默认就是这个值）         g.DrawCurve(Rp, p, 0.5F);        //当需要在一个图里绘制多条曲线的时候，就多定义个point数组，然后画出来就可以了。         for (int i = 0; i < count; i++)        {            //绘制发送记录点的发送量             g.DrawString(dt.Rows[i]["testvalue"].ToString(), font, Bluebrush, p[i].X, p[i].Y - 10);            //绘制发送记录点             g.DrawRectangle(Rp, p[i].X - 1, p[i].Y - 1, 2, 2);        }        //保存绘制的图片         MemoryStream stream = new MemoryStream();        img.Save(stream, ImageFormat.Jpeg);        //图片输出         System.Web.HttpContext.Current.Response.Clear();        System.Web.HttpContext.Current.Response.ContentType = "image/jpeg";        System.Web.HttpContext.Current.Response.BinaryWrite(stream.ToArray());    }}