C#.NET 用程序画图(走势图/柱形图)

2008/01/07 15:12using 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());

}