绘图(包括绘坐标,图片)
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.IO;
using System.Data.SqlClient;
public partial class Image : System.Web.UI.Page //制作人:陆永群
{
protected void Page_Load(object sender, EventArgs e)
{
//获取上个页面传来的值
ArrayList p = (ArrayList)Cache[Request.QueryString["param"]];
int intMapID = int.Parse(p[0].ToString());
string strCoor = p[1].ToString();
string[] str = strCoor.Split(',');
//图片参数
int iImageWidth = 0, iImageHeight = 0;
int iPosX, iPosY;
//从数据库获取数据流
string strConn;
string strSQL;
strConn = System.Configuration.ConfigurationManager.AppSettings["MapConnectionString"];
SqlConnection sqlConn = new SqlConnection(strConn);
sqlConn.Open();
strSQL = "SELECT * FROM tMap WHERE MMapID=@PMapID";
SqlCommand sqlComm = new SqlCommand(strSQL, sqlConn);
sqlComm.Parameters.Add(new SqlParameter("@PMapID", SqlDbType.NVarChar));
sqlComm.Parameters["@PMapID"].Value = intMapID;
SqlDataReader sqlDR = sqlComm.ExecuteReader();
MemoryStream ms1=new MemoryStream();
if (sqlDR.Read())
{
ms1 = new MemoryStream((byte[])sqlDR["MMapData"]);
}
if (sqlDR != null) sqlDR.Close();
if (sqlConn != null) sqlConn.Close();
Bitmap bmTemp = new Bitmap(ms1); // 用数据流填充图片 并画出来
iImageWidth = bmTemp.Width;
iImageHeight = bmTemp.Height;
Bitmap bmMain = new Bitmap(iImageWidth + 16, iImageHeight + 16);
Graphics g = Graphics.FromImage(bmMain);
g.Clear(Color.White);
iPosX = 15;
iPosY = 15;
g.DrawImage(bmTemp, iPosX, iPosY, iImageWidth, iImageHeight);
bmTemp.Dispose();
Point p1 = new Point(); //画坐标轴！
Point p2 = new Point();
Pen pen1 = new Pen(new SolidBrush(Color.FromArgb(0, 0, 0)));
pen1.Color = Color.Black;
p1.X = 0;
p1.Y = 0;
p2.X = iImageWidth + 15;
p2.Y = 0;
g.DrawLine(pen1, p1, p2); //画外 上线
p1.X = iImageWidth + 15;
p1.Y = iImageHeight + 15;
g.DrawLine(pen1, p2, p1); //画外 右线
p2.X = 0;
p2.Y = iImageHeight + 15;
g.DrawLine(pen1, p1, p2); //画外 下线
p1.X = 0;
p1.Y = 0;
g.DrawLine(pen1, p2, p1); //画外 左线
p1.X = 15;
p1.Y = 15;
p2.X = iImageWidth + 15;
p2.Y = 15;
g.DrawLine(pen1, p1, p2); //画内
p2.X = 15;
p2.Y = iImageHeight + 15;
g.DrawLine(pen1, p1, p2); //画内线
//横标尺
int intX = 15;
while (intX <= iImageWidth + 15)
{
p1.X = intX;
p1.Y = 10;
p2.X = intX;
p2.Y = 15;
if ((intX - 15) % 100 == 0)
{
p1.Y = 5;
p2.Y = iImageHeight + 15;
}
g.DrawLine(pen1, p1, p2);
intX = intX + 10;
}
//竖标尺
int intY = 15;
while (intY <= iImageHeight + 15)
{
p1.X = 10;
p1.Y = intY;
p2.X = 15;
p2.Y = intY;
if ((intY - 15) % 100 == 0)
{
p1.X = 5;
p2.X = iImageWidth + 15;
}
g.DrawLine(pen1, p1, p2);
intY = intY + 10;
}
//为横坐标增加数字标示
intX = 15;
int drawInt = 0;
while (intX <= iImageWidth + 15)
{
if ((intX - 15) % 100 == 0)
{
drawInt = intX - 15;
String drawString = drawInt.ToString();
SolidBrush drawBrush = new SolidBrush(Color.Black);
Font drawFont = new Font("Arial", 7);
iPosX = intX;
iPosY = 0;
g.DrawString(drawString, drawFont, drawBrush, iPosX, iPosY);
intX = intX + 100;
}
}
//为纵坐标增加数字标示
intY = 15;
drawInt = 0;
while (intY <= iImageHeight + 15)
{
if ((intY - 15) % 100 == 0)
{
drawInt = intY - 15;
String drawString = drawInt.ToString();
SolidBrush drawBrush = new SolidBrush(Color.Black);
Font drawFont = new Font("Arial", 7);
iPosX = 0;
iPosY = intY;
g.DrawString(drawString, drawFont, drawBrush, iPosX, iPosY);
intY = intY + 100;
}
}
//为图片增加数字表示
intX = 315;
intY = 115;
drawInt = 0;
int drawInt1 = 0;
while (intY <= iImageHeight + 15)
{
while (intX <= iImageWidth + 15)
{
if ((intY - 15) % 100 == 0 && (intX - 15) % 300 == 0)
{
drawInt = intX - 15;
drawInt1 = intY - 15;
String drawString = "("+drawInt.ToString() + "," + drawInt1.ToString()+")";
SolidBrush drawBrush = new SolidBrush(Color.Black);
Font drawFont = new Font("Arial", 7);
iPosX = intX;
iPosY = intY;
g.DrawString(drawString, drawFont, drawBrush, iPosX, iPosY);
}
intX = intX + 300;
}
intY = intY + 100;
intX = 315;
}
//画数据库原有的热点区域
sqlConn.Open();
strSQL = "SELECT * FROM tArea WHERE MMapID=@PMapID";
SqlCommand sqlComm1 = new SqlCommand(strSQL, sqlConn);
sqlComm1.Parameters.Add(new SqlParameter("@PMapID", SqlDbType.NVarChar));
sqlComm1.Parameters["@PMapID"].Value = intMapID;
SqlDataReader sqlDR1 = sqlComm1.ExecuteReader();
while (sqlDR1.Read())
{
string strArea = sqlDR1["MCoords"].ToString();
string[] str1 = strArea.Split(',');
pen1.Color = Color.Coral;
p1.X = int.Parse(str1[0]) + 15; //取第一点
p1.Y = int.Parse(str1[1]) + 15;
int i = 2;
while (i < str1.Length) //循环取出其他的点并连接起来。
{
p2.X = int.Parse(str1[i]) + 15;
p2.Y = int.Parse(str1[i + 1]) + 15;
g.DrawLine(pen1, p1, p2);
p1.X = p2.X;
p1.Y = p2.Y;
i += 2;
}
p1.X = int.Parse(str1[0]) + 15; //把图形封闭起来
p1.Y = int.Parse(str1[1]) + 15;
p2.X = int.Parse(str1[str1.Length - 2]) + 15;
p2.Y = int.Parse(str1[str1.Length - 1]) + 15;
g.DrawLine(pen1, p1, p2);
}
if (sqlDR != null) sqlDR.Close();
if (sqlConn != null) sqlConn.Close();
if (strCoor != "") //画预览区域
{
pen1.Color = Color.Blue;
p1.X = int.Parse(str[0])+15; //取第一点
p1.Y = int.Parse(str[1])+15;
int i = 2;
while (i < str.Length) //循环取出其他的点并连接起来。
{
p2.X = int.Parse(str[i])+15;
p2.Y = int.Parse(str[i+1])+15;
g.DrawLine(pen1, p1, p2);
p1.X = p2.X;
p1.Y = p2.Y;
i+= 2;
}
p1.X = int.Parse(str[0]) + 15; //把图形封闭起来
p1.Y = int.Parse(str[1])+ 15;
p2.X = int.Parse(str[str.Length - 2]) + 15;
p2.Y = int.Parse(str[str.Length - 1]) + 15;
g.DrawLine(pen1, p1, p2);
}
bmMain.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
g.Dispose();
bmMain.Dispose(); //完成
}
}