生成折线图，源代码

最新推荐文章于 2025-07-22 10:41:02 发布

飞鸟flyboy

最新推荐文章于 2025-07-22 10:41:02 发布

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本文介绍了一种使用C#绘制动态折线图的方法，包括如何设置坐标轴、绘制线条和填充背景等步骤。适用于需要展示数据变化趋势的应用场景。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;

public partial class Statistics_test1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

//图片大小imgx,imgy

        int imgx = 800, imgy = 700;//整个图片的长宽
        String[] nw = { "第一天", "第二天", "第三天", "第四天", "第9天" };
        int[] ss = { 100, 200, 300,400, 10000};//暂时不支持负数

        int tempmax = 0, tempmix = 0,ping=0;
        for (int i = 0; i < ss.Length; i++)
        {
            if (tempmax < ss[i])
                tempmax = ss[i];


        }
        ping = (tempmax - tempmix) / 10;

        String[] mw = { "0人", " 100人", " 200人", "300人", " 400人", " 500人", " 600人", " 700人", "800人", " 900人",tempmax.ToString()};

        for (int i = 0; i < 10; i++)
        {
            mw[i] = (tempmix + (ping * i)).ToString();
        }

        CreateImage(imgx, imgy, nw, mw, ss, tempmax);//调用画图函数
    }
    private void CreateImage(int width, int height, string[] nw, string[] mw, int[] ss, int tempmax)
    {
        int xshu = nw.Length, yshu = mw.Length-1;//x上面点数量

        Bitmap image = new Bitmap(width, height);
        Graphics g = Graphics.FromImage(image);
        //定义一个26个颜色数组
        Brush[] yanse ={Brushes.SeaGreen,Brushes.DarkBlue,Brushes.LightSlateGray,Brushes.Tomato,Brushes.Maroon
                           ,Brushes.Blue,Brushes.Purple,Brushes.DarkKhaki,Brushes.Red,Brushes.RosyBrown
                           ,Brushes.Chocolate,Brushes.DarkOrchid,Brushes.CornflowerBlue,Brushes.Salmon,Brushes.SlateBlue,
                           Brushes.SteelBlue,Brushes.Black,Brushes.DarkGoldenrod,Brushes.DarkGreen,Brushes.DarkMagenta
                           ,Brushes.YellowGreen,Brushes.DeepPink,Brushes.DeepSkyBlue,Brushes.Teal,Brushes.Lime,
                           Brushes.Turquoise};
        try
        {
            //清空图片背景色
            g.Clear(Color.White);

            Font font = new System.Drawing.Font("Arial", 9, FontStyle.Regular);
            Font font1 = new System.Drawing.Font("宋体", 20, FontStyle.Regular);
            Font font2 = new System.Drawing.Font("Arial", 8, FontStyle.Regular);
            LinearGradientBrush brush = new LinearGradientBrush(
            new Rectangle(0, 0, image.Width, image.Height), Color.LightGray, Color.LightGray, 1.2f, true);

            g.FillRectangle(Brushes.AliceBlue, 0, 0, width, height);
            Brush brush1 = new SolidBrush(Color.Black);
            Brush brush2 = new SolidBrush(Color.SaddleBrown);

            g.DrawString(" 折线图", font1, brush1, new PointF(image.Width/2-80, 30));//文字的位置
            //画图片的边框线
           // g.DrawRectangle(new Pen(Color.Red), 0, 0, image.Width - 1, image.Height - 1);

            Pen mypen = new Pen(brush, 1);

            //绘制线条
            //绘制纵向线条
            int x = 60;
            for (int i = 0; i < xshu; i++)
            {
                if(i==0)
                    g.DrawLine(mypen, x + 2, 80, x + 2, image.Height - 160);//内部竖线，第一个数值是开始高度，第二个数值结束高度，
                else
                  g.DrawLine(mypen, x, 80, x, image.Height - 160);//内部竖线，第一个数值是开始高度，第二个数值结束高度，


                x = x + (width - 140) / xshu;
            }
            Pen mypen1 = new Pen(Color.Black, 3);
            x = 60;
            g.DrawLine(mypen1, x, 76, x, image.Height - 160);//图标的Y轴开始对应图原点的X,Y坐标

////绘制横向线条
int y = image.Height - 160;//第一条线横线，相对于顶点的高度

            for (int i = 0; i < yshu+1; i++)
            {
                g.DrawLine(mypen, 62, y, image.Width - 80, y);
                y = y - ((image.Height - 240) / yshu);
            }
            y = 106;
           //画出了内部的横线

            //for (int i = 0; i < yshu; i++)
            //{
            //    g.DrawLine(mypen, 60, y, 620, y);
            //    y = y + (260 / yshu);
            //}
            // y = 106;
            g.DrawLine(mypen1, 60, image.Height - 160, image.Width - 80, image.Height - 160);

            //x轴
             String[] n = nw;//使用外部数组
            x = 45;
            for (int i = 0; i < n.Length; i++)
            {
                g.DrawString(n[i].ToString(), font, Brushes.Black, x, image.Height - 160+10); //设置文字内容及输出位置
                x = x + (width - 140) / xshu;
            }

            //y轴
            String[] m = mw;
            y = image.Height - 160;
            for (int i = 0; i <m.Length; i++)
            {
                g.DrawString(m[i].ToString(), font, Brushes.Black, 20, y); //设置文字内容及输出位置
                y = y - ((image.Height - 240) / yshu);
            }

//int[] Count1 = new int[7];
//int[] Count2 = new int[7];

            //SqlConnection Con = new SqlConnection("Server=(Local);Database=committeeTraining;Uid=sa;Pwd=eesoft");
            //Con.Open();
            //string cmdtxt2 = "SELECT * FROM ##Count where Company='" + this.ddlTaget.SelectedItem.Text.Trim() + "'";
            //SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, Con);
            //DataSet ds = new DataSet();
            //da.Fill(ds);

            //报名人数
            //Count1[0] = Convert.ToInt32(ds.Tables[0].Rows[0]["count1"].ToString());
            //Count1[1] = Convert.ToInt32(ds.Tables[0].Rows[0]["count3"].ToString());
            //Count1[2] = Convert.ToInt32(ds.Tables[0].Rows[0]["count5"].ToString());
            //Count1[3] = Convert.ToInt32(ds.Tables[0].Rows[0]["count7"].ToString());

//Count1[6] = Convert.ToInt32(ds.Tables[0].Rows[0]["count9"].ToString()); //全年

//Count1[4] = Count1[0] + Count1[1];
//Count1[5] = Count1[2] + Count1[3];

            //Count2[0] = Convert.ToInt32(ds.Tables[0].Rows[0]["count2"].ToString());
            //Count2[1] = Convert.ToInt32(ds.Tables[0].Rows[0]["count4"].ToString());
            //Count2[2] = Convert.ToInt32(ds.Tables[0].Rows[0]["count6"].ToString());
            //Count2[3] = Convert.ToInt32(ds.Tables[0].Rows[0]["count8"].ToString());

//Count2[6] = Convert.ToInt32(ds.Tables[0].Rows[0]["count10"].ToString()); //全年

//Count2[4] = Count2[0] + Count2[1];
//Count2[5] = Count2[2] + Count2[3];

            //显示折线效果
            Font font3 = new System.Drawing.Font("Arial", 10);
            Pen mypen2 = null;
            Point[] points1 = null;

            mypen2 = new Pen(yanse[0], 2);
            points1 = new Point[xshu];
            for (int i = 0; i < xshu; i++)
            {
                //((image.Height - 240) / yshu//高度
                points1[i].X = 60 + ((image.Width - 140) / xshu * i); points1[i].Y = image.Height - 160 - (image.Height - 240 ) * ss[i] / tempmax; //从106纵坐标开始, 到(0, 0)坐标时
                g.DrawString(ss[i].ToString(), font3, yanse[0], 60 + ((image.Width - 140) / xshu * i) - 20, points1[i].Y - 20);
            }

g.DrawLines(mypen2, points1); //绘制折线

//绘制数字

            //这里要放置26个 (width - 140)
            //高度
            int tempgx = 40 , tempgy = image.Height - 120;
            int byl = tempgx;
            for (int i = 0; i < 26; i++)
            {

                if (240 + (byl * 150) > width - 60)
                {
                    byl = 0;
                    tempgx = 40;
                    tempgy = tempgy + 16;
                }
                else
                {
                    byl += 1;
                    tempgx = 40 + (byl * 150);

                }
                g.FillRectangle(yanse[i], tempgx, tempgy, 20, 10); //绘制小矩形
                g.DrawString("报名人数", font2, yanse[i], tempgx + 22, tempgy - 2);

}

//g.FillRectangle(Brushes.Green, 100, 322, 20, 10);
//g.DrawString("通过人数", font2, Brushes.Green, 122, 320);

            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            Response.ClearContent();
            Response.ContentType = "image/Jpeg";
           Response.BinaryWrite(ms.ToArray());
            //页面显示图片

            //把图片保存到本地
            //string uploadFilePath = null;
            //uploadFilePath = System.Web.HttpContext.Current.Server.MapPath("../") + "zxt.jpg";
            //image.Save(uploadFilePath, System.Drawing.Imaging.ImageFormat.Jpeg);
        }
        finally
        {
            g.Dispose();
            image.Dispose();
        }
    }

}

引用空间：http://www.cnblogs.com/ziyiFly/archive/2008/09/24/1297841.html