饼形统计图

数据库同 柱状统计图

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.SqlClient;

using System.Configuration;

using System.Drawing;

using System.Data;

using System.Collections;

using System.IO;



public partial class CakeImage : System.Web.UI.Page

{

    public string connStr = ConfigurationManager.ConnectionStrings["VisitCountConnectionString"].ToString();

    protected void Page_Load(object sender, EventArgs e)

    {

        DrawLinearGradient();

    }

    //访问人数统计

    public int Total()

    {

        int result = -1;

        string sql = "select count(1) from VisiteCount";

        SqlConnection conn = new SqlConnection(connStr);

        conn.Open();

        SqlCommand cmd = new SqlCommand(sql, conn);

        result = Convert.ToInt32(cmd.ExecuteScalar());

        cmd.Dispose();

        conn.Close();

        return result;

    }

    //柱形图

    public void DrawLinearGradient()

    {

        int[] count = new int[12];

        string sql = "";

        SqlConnection conn = new SqlConnection(connStr);

        conn.Open();

        SqlDataAdapter da;

        DataSet ds = new DataSet();

        for (int i = 0; i < 12; i++)

        {

            sql = @"select count(1) as count,Month(loginTime) as month from VisiteCount where YEAR(loginTime)=2013 and MONTH(loginTime)=" + (i + 1) + " group by MONTH(loginTime)";

            da = new SqlDataAdapter(sql, conn);

            da.Fill(ds, i.ToString());

            if (ds.Tables[i].Rows.Count == 0)

            {

                count[i] = 0;

            }

            else

            {

                //count[i] = Convert.ToInt32(ds.Tables[i].Rows[0][0].ToString())*100/Total();

                count[i] = Convert.ToInt32(ds.Tables[i].Rows[0][0].ToString());

            }

        }

        //设置字体

        Font fontlegend = new Font("verdana",9);

        Font fonttitle = new Font("verdana", 10, FontStyle.Bold);

        //设置背景宽度

        int width = 230;

        int bufferspace = 15;

        int lengendheight = fontlegend.Height * 13 + bufferspace;//饼图下方分类表表高度

        int titleheight = fonttitle.Height+bufferspace;//标题栏高度

        int height = width+lengendheight+titleheight+bufferspace;//白色背景的高度

        int pieheight = width;//饼图的高度

        Rectangle pierect = new Rectangle(0, titleheight, width, pieheight);

        //加随机色

        ArrayList colors = new ArrayList();

        Random rnd = new Random();

        for (int i = 0; i < 12; i++)

        { 

            colors.Add(new SolidBrush(Color.FromArgb(rnd.Next(255),rnd.Next(255),rnd.Next(255))));

        }

        //创建一个bitmap

        Bitmap objimage = new Bitmap(width,height);

        Graphics objg = Graphics.FromImage(objimage);

        objg.FillRectangle(Brushes.White, 0, 0, width, height);

        

        //画一个亮色背景

        objg.FillRectangle(new SolidBrush(Color.Beige),pierect);

        //显示标题

        objg.DrawString("2013网站浏览每月比例调查", fonttitle, Brushes.Black, new PointF(32,12));

        //画饼图

        float currentnum = 0.0f;

        for (int i = 0; i < 12; i++)

        {

            objg.FillPie((SolidBrush)colors[i], pierect, currentnum, Convert.ToSingle(count[i]) / Total() * 360);

            currentnum+=Convert.ToSingle(count[i]) / Total() * 360;

        }

        objg.DrawRectangle(new Pen(Color.Blue, 2), 0, height - lengendheight, width, lengendheight);

        string[] n = {"一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};

        for (int i = 0; i < 12; i++)

        {

            objg.FillRectangle((SolidBrush)colors[i], 5, height - lengendheight+fontlegend.Height*i+5,10,10);

            string dble = (Convert.ToDouble(count[i]) / Total() * 100).ToString().Substring(0, 4)+"%";

            objg.DrawString(n[i] + "----" + dble, fontlegend, Brushes.Black,20, height - lengendheight+fontlegend.Height*i+1);

        }

        objg.DrawString("2013网络浏览总数:" + Total() + "次", fontlegend, Brushes.Black, 5, height - fontlegend.Height);

        Response.ContentType="image/Jpeg";

        objimage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

        objg.Dispose();

        objimage.Dispose();

    }

}

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