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  • C#.NET 画曲线图

    C#.NET 用程序画图,曲线图

     

    using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using System.Drawing.Imaging;
    using System.Drawing;

    /// <summary>
    /// DrawingCurve 的摘要说明
    /// </summary>
    public class DrawingCurve
    {
        
        public int intXLong = 800;   //图片大小 长
        public int intYLong = 600;   //图片大小 高
        public int intXMultiple = 1;    //零刻度的值 X
        public int intYMultiple = 0;    //零刻度的值 Y
        public int intXMax = 12;    //最大刻度(点数) X
        public int intYMax = 30;    //最大刻度(点数) Y

        public int intLeft = 50;   //左边距
        public int intRight = 120; //右边距
        public int intTop = 30;    //上边距
        public int intEnd = 50;    //下边距

        public string strXText = "时间(单位:月)";    //单位 X
        public string strYText = "数量(单位:个)";    //单位 Y
        public string strTitle = "趋势线图";    //标题
        public DataTable tbData;    //要统计的数据


        private int intXScale = 30;    //一刻度长度 X
        private int intYScale = 30;    //一刻度高度 Y
        //private int intX = 0;   //0点 X坐标
        //private int intY = 0;   //0点 Y坐标
        public int intData = 0;    //记录数

        public DrawingCurve()
        {

            intXScale = (intXLong - intLeft - intRight) / (intXMax + 1);//一刻度长度 X
            intYScale = (intYLong - intTop - intEnd) / (intYMax + 1);//一刻度高度 Y

            //intX = intXLong - intLeft;   //0点 X坐标
            //intY = intYLong - intEnd;   //0点 Y坐标
        }

        public Bitmap DrawingImg()
        {

            Bitmap img = new Bitmap(intXLong, intYLong); //图片大小
            Graphics g = Graphics.FromImage(img);
            g.Clear(Color.Snow);
            g.DrawString(strTitle, new Font("宋体", 14), Brushes.Black, new Point(5, 5));
            g.DrawLine(new Pen(Color.Black, 2), intLeft, intYLong - intEnd, intXLong - intRight, intYLong - intEnd); //绘制横向
            g.DrawLine(new Pen(Color.Black, 2), intLeft, intTop, intLeft, intYLong - intEnd);   //绘制纵向

            //绘制纵坐标
            g.DrawString(strYText, new Font("宋体", 12), Brushes.Black, new Point(intLeft, intTop));//Y 单位
            Point p1 = new Point(intLeft - 10, intYLong - intEnd);
            for (int j = 0; j <= intYMax; j++)
            {
                p1.Y = intYLong - intEnd - j * intYScale;
                Point pt = new Point(p1.X + 10, p1.Y);
                //绘制纵坐标的刻度和直线
                g.DrawLine(Pens.Black, pt, new Point(p1.X + 15, p1.Y));
                //绘制纵坐标的文字说明
                g.DrawString(Convert.ToString(j + intYMultiple), new Font("宋体", 12), Brushes.Black, new Point(p1.X - 25, p1.Y - 8));
            }

            //绘制横坐标
            g.DrawString(strXText, new Font("宋体", 12), Brushes.Black, new Point(intXLong - intRight, intYLong - intEnd));//X 单位
            Point p = new Point(intLeft, intYLong - intEnd);
            for (int i = 0; i < intXMax; i++)
            {
                p.X = intLeft + i * intXScale;
                //绘制横坐标刻度和直线
                g.DrawLine(Pens.Black, p, new Point(p.X, p.Y - 5));
                //绘制横坐标的文字说明
                g.DrawString(Convert.ToString(i + intXMultiple), new Font("宋体", 12), Brushes.Black, p);
            }


            intData = tbData.Rows.Count;
            if (intData > 0)
            {
                //趋势线图
                for (int i = 0; i < intData - 1; i++)
                {
                    DataRow Row1 = tbData.Rows[i];
                    DataRow Row2 = tbData.Rows[i + 1];
                    //定义起点
                    Point rec = new Point(Convert.ToInt32(intLeft + ((TurnNumber(Row1[0].ToString()) - intXMultiple) * intXScale)), Convert.ToInt32(intYLong - intEnd - (TurnNumber(Row1[1].ToString()) - intYMultiple) * intYScale));
                    //定义终点
                    Point dec = new Point(Convert.ToInt32(intLeft + ((TurnNumber(Row2[0].ToString()) - intXMultiple) * intXScale)), Convert.ToInt32(intYLong - intEnd - (TurnNumber(Row2[1].ToString()) - intYMultiple) * intYScale));
                    //绘制趋势折线
                    g.DrawLine(new Pen(Color.Red), rec, dec);
                }
            }

            return img;
        }

        //转换数字
        private double TurnNumber(string str)
        {
            double dubReturn;
            try
            {
                dubReturn = Convert.ToDouble(str);
            }
            catch
            {
                dubReturn = 0;
            }
            return dubReturn;

        }

    }

    ----------------------------------调用------------------------------------------------

    protected void Page_Load(object sender, EventArgs e)
        {
            DataTable MyTable = new DataTable();
           

            string constr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("App_Data/db.mdb");
            string cmdstr = "SELECT 月份,销量 FROM Result";
            OleDbConnection con = new OleDbConnection(constr);
            con.Open();
            //OleDbCommand cmd = new OleDbCommand(cmdstr, con);
            OleDbDataAdapter da = new OleDbDataAdapter(cmdstr, con);
            da.Fill(MyTable);


            DrawingCurve MyDc = new DrawingCurve();
            MyDc.tbData = MyTable;

            Bitmap img = new Bitmap(100, 100);
            img = MyDc.DrawingImg();
            Graphics g = Graphics.FromImage(MyDc.DrawingImg());

            //显示图形
            img.Save(Response.OutputStream, ImageFormat.Jpeg);;
            g.Dispose();
            Response.Write("<br>" + MyDc.intData.ToString());
        }
     

     

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  • 原文地址:https://www.cnblogs.com/kingangWang/p/2482209.html
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