实例介绍
【实例简介】读取shapfile文件
【实例截图】
【核心代码】
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace EsriShpReader
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
ArrayList polygons = new ArrayList();//面集合
ArrayList polylines = new ArrayList();//线集合
ArrayList points = new ArrayList();//点集合
Pen pen = new Pen(Color.Black, 1);//定义画笔
int ShapeType;//shp文件类型
int count;//计数
double xmin, ymin, xmax, ymax;
double n1, n2;//x，y轴放大倍数
private void Form1_Load(object sender, EventArgs e)
{
}
private void button_open_Click(object sender, EventArgs e)
{
string shpfilepath = "";
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "shapefiles(*.shp)|*.shp|All files(*.*)|*.*";//打开文件路径
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
shpfilepath = openFileDialog1.FileName;
BinaryReader br = new BinaryReader(openFileDialog1.OpenFile());
//读取文件过程
br.ReadBytes(24);
int FileLength = br.ReadInt32();//<0代表数据长度未知
int FileBanben = br.ReadInt32();
ShapeType = br.ReadInt32();
xmin = br.ReadDouble();
ymax = -1 * br.ReadDouble();
xmax = br.ReadDouble();
ymin = -1 * br.ReadDouble();
double width = xmax - xmin;
double height = ymax - ymin;
n1 = (float)(this.panel1.Width * 0.9 / width);//x轴放大倍数
n2 = (float)(this.panel1.Height * 0.9 / height);//y轴放大倍数
br.ReadBytes(32);
switch (ShapeType)
{
case 1:
points.Clear();
while (br.PeekChar() != -1)
{
Point point = new Point();
uint RecordNum = br.ReadUInt32();
int DataLength = br.ReadInt32();
//读取第i个记录
br.ReadInt32();
point.X = br.ReadDouble();
point.Y = -1 * br.ReadDouble();
points.Add(point);
}
StreamWriter sw = new StreamWriter("point.txt");
foreach (Point p in points)
{
sw.WriteLine("{0},{1},{2} ", p.X, -1 * p.Y, 0);
}
sw.Close();
break;
case 3:
polylines.Clear();
while (br.PeekChar() != -1)
{
Polyline polyline = new Polyline();
polyline.Box = new double[4];
polyline.Parts = new ArrayList();
polyline.Points = new ArrayList();
uint RecordNum = br.ReadUInt32();
int DataLength = br.ReadInt32();
//读取第i个记录
br.ReadInt32();
polyline.Box[0] = br.ReadDouble();
polyline.Box[1] = br.ReadDouble();
polyline.Box[2] = br.ReadDouble();
polyline.Box[3] = br.ReadDouble();
polyline.NumParts = br.ReadInt32();
polyline.NumPoints = br.ReadInt32();
for (int i = 0; i < polyline.NumParts; i )
{
int parts = new int();
parts = br.ReadInt32();
polyline.Parts.Add(parts);
}
for (int j = 0; j < polyline.NumPoints; j )
{
Point pointtemp = new Point();
pointtemp.X = br.ReadDouble();
pointtemp.Y = -1 * br.ReadDouble();
polyline.Points.Add(pointtemp);
}
polylines.Add(polyline);
}
StreamWriter sw2 = new StreamWriter("line.txt");
count = 1;
foreach (Polyline p in polylines)
{
for (int i = 0; i < p.NumParts; i )
{
int startpoint;
int endpoint;
if (i == p.NumParts - 1)
{
startpoint = (int)p.Parts[i];
endpoint = p.NumPoints;
}
else
{
startpoint = (int)p.Parts[i];
endpoint = (int)p.Parts[i 1];
}
sw2.WriteLine("线" count.ToString() ":");
for (int k = 0, j = startpoint; j < endpoint; j , k )
{
Point ps = (Point)p.Points[j];
sw2.WriteLine(" {0},{1},{2} ", ps.X, -1 * ps.Y, 0);
}
count ;
}
}
sw2.Close();
break;
case 5:
polygons.Clear();
while (br.PeekChar() != -1)
{
Polygon polygon = new Polygon();
polygon.Parts = new ArrayList();
polygon.Points = new ArrayList();
uint RecordNum = br.ReadUInt32();
int DataLength = br.ReadInt32();
//读取第i个记录
int m = br.ReadInt32();
for (int i = 0; i < 4; i )
{
polygon.Box[i] = br.ReadDouble();
}
polygon.NumParts = br.ReadInt32();
polygon.NumPoints = br.ReadInt32();
for (int j = 0; j < polygon.NumParts; j )
{
int parts = new int();
parts = br.ReadInt32();
polygon.Parts.Add(parts);
}
for (int j = 0; j < polygon.NumPoints; j )
{
Point pointtemp = new Point();
pointtemp.X = br.ReadDouble();
pointtemp.Y = -1 * br.ReadDouble();
polygon.Points.Add(pointtemp);
}
polygons.Add(polygon);
}
StreamWriter sw1 = new StreamWriter("polygon.txt");
count = 1;
foreach (Polygon p in polygons)
{
for (int i = 0; i < p.NumParts; i )
{
int startpoint;
int endpoint;
if (i == p.NumParts - 1)
{
startpoint = (int)p.Parts[i];
endpoint = p.NumPoints;
}
else
{
startpoint = (int)p.Parts[i];
endpoint = (int)p.Parts[i 1];
}
sw1.WriteLine("多边形" count.ToString() ":");
for (int k = 0, j = startpoint; j < endpoint; j , k )
{
Point ps = (Point)p.Points[j];
sw1.WriteLine(" {0},{1},{2} ", ps.X, -1 * ps.Y, 0);
}
count ;
}
}
sw1.Close();
break;
}
}
}
private void button_updata_Click(object sender, EventArgs e)
{
double width = xmax - xmin;//图像宽
double height = ymax - ymin;//图像高
n1 = (float)(this.panel1.Width * 0.9 / width);//x轴放大倍数
n2 = (float)(this.panel1.Height * 0.9 / height);//y轴放大倍数
this.panel1.Refresh();
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
PointF[] point;
switch (ShapeType)
{
case 1://点类型
foreach (Point p in points)
{
PointF pp = new PointF();
pp.X = (float)(10 (p.X - xmin) * n1);
pp.Y = (float)(10 (p.Y - ymin) * n2);
e.Graphics.DrawEllipse(pen, pp.X, pp.Y, 1.5f, 1.5f);
}
break;
case 3://线类型
foreach (Polyline p in polylines)
{
for (int i = 0; i < p.NumParts; i )
{
int startpoint;
int endpoint;
point = null;
if (i == p.NumParts - 1)
{
startpoint = (int)p.Parts[i];
endpoint = p.NumPoints;
}
else
{
startpoint = (int)p.Parts[i];
endpoint = (int)p.Parts[i 1];
}
point = new PointF[endpoint - startpoint];
for (int k = 0, j = startpoint; j < endpoint; j , k )
{
Point ps = (Point)p.Points[j];
point[k].X = (float)(10 (ps.X - xmin) * n1);
point[k].Y = (float)(10 (ps.Y - ymin) * n2);
}
e.Graphics.DrawLines(pen, point);
}
}
break;
case 5://面类型
foreach (Polygon p in polygons)
{
for (int i = 0; i < p.NumParts; i )
{
int startpoint;
int endpoint;
point = null;
if (i == p.NumParts - 1)
{
startpoint = (int)p.Parts[i];
endpoint = p.NumPoints;
}
else
{
startpoint = (int)p.Parts[i];
endpoint = (int)p.Parts[i 1];
}
point = new PointF[endpoint - startpoint];
for (int k = 0, j = startpoint; j < endpoint; j , k )
{
Point ps = (Point)p.Points[j];
point[k].X = (float)(10 (ps.X - xmin) * n1);
point[k].Y = (float)(10 (ps.Y - ymin) * n2);
}
e.Graphics.DrawPolygon(pen, point);
}
}
break;
}
// PointF[] point;
switch (ShapeType)
{
case 1://点类型
foreach (Point p in points)
{
PointF pp = new PointF();
pp.X = (float)(10 (p.X - xmin) * n1);
pp.Y = (float)(10 (p.Y - ymin) * n2);
e.Graphics.DrawEllipse(pen, pp.X, pp.Y, 1.5f, 1.5f);
}
break;
case 3://线类型
foreach (Polyline p in polylines)
{
for (int i = 0; i < p.NumParts; i )
{
int startpoint;
int endpoint;
point = null;
if (i == p.NumParts - 1)
{
startpoint = (int)p.Parts[i];
endpoint = p.NumPoints;
}
else
{
startpoint = (int)p.Parts[i];
endpoint = (int)p.Parts[i 1];
}
point = new PointF[endpoint - startpoint];
for (int k = 0, j = startpoint; j < endpoint; j , k )
{
Point ps = (Point)p.Points[j];
point[k].X = (float)(10 (ps.X - xmin) * n1);
point[k].Y = (float)(10 (ps.Y - ymin) * n2);
}
e.Graphics.DrawLines(pen, point);
}
}
break;
case 5://面类型
foreach (Polygon p in polygons)
{
for (int i = 0; i < p.NumParts; i )
{
int startpoint;
int endpoint;
point = null;
if (i == p.NumParts - 1)
{
startpoint = (int)p.Parts[i];
endpoint = p.NumPoints;
}
else
{
startpoint = (int)p.Parts[i];
endpoint = (int)p.Parts[i 1];
}
point = new PointF[endpoint - startpoint];
for (int k = 0, j = startpoint; j < endpoint; j , k )
{
Point ps = (Point)p.Points[j];
point[k].X = (float)(10 (ps.X - xmin) * n1);
point[k].Y = (float)(10 (ps.Y - ymin) * n2);
}
e.Graphics.DrawPolygon(pen, point);
}
}
break;
}
}
}
}
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