引用库：
代码如下：
cs
//using GeoAPI.Geometries;
using NetTopologySuite.Features;
using NetTopologySuite.Geometries;
using NetTopologySuite;
using NetTopologySuite.IO;
using Coordinate = NetTopologySuite.Geometries.Coordinate;
//using GeoAPI;
using NetTopologySuite.Operation.Polygonize;
using System.Threading;
using Point = NetTopologySuite.Geometries.Point;
using Polygon = NetTopologySuite.Geometries.Polygon;
using NetTopologySuite.Index.Quadtree;
using NetTopologySuite.Index.Strtree;
using NetTopologySuite.Triangulate;
using NetTopologySuite.Operation.Linemerge;
using System.Windows.Media;
using GeometryCollection = NetTopologySuite.Geometries.GeometryCollection;
using NetTopologySuite.Operation.Distance;
using NetTopologySuite.Algorithm;
using NetTopologySuite.Index.Bintree;
using System.Net.NetworkInformation;
using GeoAPI.Geometries;
using NetTopologySuite.IO.Esri.Shapefiles;
using NetTopologySuite.IO.Esri.Dbf;
using System.Collections;
[assembly: CommandClass(typeof(IfoxDemo.NTS自己))]//只允许此类快捷键命令
namespace IfoxDemo
{
public class NTS自己
{
[CommandMethod("xx")]
public static void shp()
{
var ed = Env.Editor;
"ad".Print();
// 创建一个点对象
var point = new Point(10, 20);
ed.WriteMessage("// 创建一个点对象 point :" + point + "\n");
// 创建一条线段对象
var line = new LineString(new[] { new Coordinate(0, 0),
new Coordinate(10, 10),
new Coordinate(20, 0)
});
ed.WriteMessage("// 创建一条线段对象 line :" + line + "\n");
// 创建一个多边形对象
var polygon = new Polygon(new LinearRing(new[] {
new Coordinate(0, 0),
new Coordinate(0, 10),
new Coordinate(10, 10),
new Coordinate(10, 0),
new Coordinate(0, 0)
}));
ed.WriteMessage("// 创建一个多边形对象 polygon : " + polygon + "\n");
// 计算两个几何对象之间的距离
var distance = point.Distance(line);
ed.WriteMessage("// 计算两个几何对象之间的距离 distance: " + distance + "\n");
// 计算一个几何对象的缓冲区
var buffer = polygon.Buffer(0.5);
Env.Editor.WriteMessage("//计算一个几何对象的缓冲区 buffer: " + buffer + "\n");
// 判断两个几何对象是否相交
var isIntersect = line.Intersects(polygon);
ed.WriteMessage("//判断两个几何对象是否相交 isIntersect: " + isIntersect + "\n");
// 创建一个包含所有几何对象的边界框
//var envelope = line.Envelope.Union(polygon.Envelope);
// public void Insert(Envelope itemEnv, T item)
//{
// CollectStats(itemEnv);
// var insertEnv = EnsureExtent(itemEnv, _minExtent);
// _root.Insert(insertEnv, item);
//}
// 创建一个 Quadtree 索引
//var index = new Quadtree<NetTopologySuite.Geometries.Geometry>();
// index.Insert(envelope,line);//有bug
//index.Insert(polygon);
// 在索引中查找与一个几何对象相交的对象
// var results = index.Query(line.EnvelopeInternal);
// Env.Editor.WriteMessage("查找与一个几何对象相交的对象 results : " + results);
GeometryFactory geometryFactory = new GeometryFactory();
// 创建点
Point point1 = geometryFactory.CreatePoint(new Coordinate(1.0, 1.0));
Point point2 = geometryFactory.CreatePoint(new Coordinate(2.0, 12.0));
Point point3 = geometryFactory.CreatePoint(new Coordinate(21.0, 22.0));
Point point4 = geometryFactory.CreatePoint(new Coordinate(23.0, 32.0));
Point point5 = geometryFactory.CreatePoint(new Coordinate(25.0, 42.0));
Point point6 = geometryFactory.CreatePoint(new Coordinate(27.0, 52.0));
Point point7 = geometryFactory.CreatePoint(new Coordinate(29.0, 62.0));
// 使用 DistanceOp 计算两点之间的距离
DistanceOp distanceOp = new DistanceOp(point1, point2);
double dist = distanceOp.Distance();
Env.Editor.WriteMessage("//计算两点之间的距离 dist : " + dist + "\n");
// 创建线段
LineString lineString = geometryFactory.CreateLineString(new Coordinate[] {
new Coordinate(0, 0),
new Coordinate(1, 1),
new Coordinate(2, 2)
});
// 创建多边形
Polygon polygon2 = geometryFactory.CreatePolygon(new Coordinate[] {
new Coordinate(0, 0),
new Coordinate(0, 1),
new Coordinate(1, 1),
new Coordinate(1, 0),
new Coordinate(0, 0)
});
//计算两条线段的夹角（不区分方向）逆时针为正
var 夹角不区分方向 = AngleUtility.AngleBetween(point1.Coordinate, point3.Coordinate, point2.Coordinate);
ed.WriteMessage("//夹角不区分方向，逆时针为正" + 夹角不区分方向 + "\n");
//计算两条线段的夹角（区分方向）
var 夹角区分方向 = AngleUtility.AngleBetweenOriented(point1.Coordinate, point3.Coordinate, point2.Coordinate);
ed.WriteMessage("//夹角区分方向" + 夹角区分方向 + "\n");
// 生成 Delaunay 三角网
DelaunayTriangulationBuilder dtb = new DelaunayTriangulationBuilder();
dtb.SetSites(new MultiPoint(new Point[] { point1, point2, point3, point4, point5, point6, point7 }));
GeometryCollection triangles = (GeometryCollection)dtb.GetTriangles(geometryFactory);
Env.Editor.WriteMessage("//Delaunay 三角网 triangles: " + triangles + "\n");
// 合并线段
LineMerger lineMerger = new LineMerger();
lineMerger.Add(lineString);
System.Collections.ICollection mergedLines = (System.Collections.ICollection)lineMerger.GetMergedLineStrings();
Env.Editor.WriteMessage("//合并线段 mergedLines : " + mergedLines + "\n");
//创建集合图形
// 几何创建工厂（也可不使用工厂模式直接创建几何图形）
var gf = new GeometryFactory();
var pg3 = gf.CreatePolygon(new[]
{
new Coordinate(612, 612),
new Coordinate(144, 355),
new Coordinate(165, 188),
new Coordinate(277, 328),
new Coordinate(612, 612)
});
Env.Editor.WriteMessage(" //创建几何图形Polygon pg3 : " + pg3 + "\n");
var pg4 = gf.CreatePolygon(new[]
{
new Coordinate(412, 612),
new Coordinate(555, 455),
new Coordinate(655, 188),
new Coordinate(577, 328),
new Coordinate(412, 612)
});
//求并集方法
var union = pg3.Union(pg4);
Env.Editor.WriteMessage("//求并集:union " + union + "\n");
//求差集方法
var difference = pg3.Difference(pg4);
Env.Editor.WriteMessage("//求差集:difference " + difference + "\n");
// 创建一个包含多个点的集合
Coordinate[] coordinates = new Coordinate[]
{
new Coordinate(0, 0),
new Coordinate(5, 0),
new Coordinate(3, 3),
new Coordinate(0, 5),
new Coordinate(2, 2),
new Coordinate(1, 4)
};
GeometryFactory geometryFactory2 = new GeometryFactory();
MultiPoint points = geometryFactory2.CreateMultiPointFromCoords(coordinates);
Env.Editor.WriteMessage("//包含多个点的集合MultiPoint: " + points + "\n");
// 使用 NetTopologySuite 计算二维凸包
ConvexHull convexHull = new ConvexHull(points);
var geo = new ConvexHull(points.Coordinates, GeometryFactory.Default).GetConvexHull();
var 二维凸包 = convexHull.GetConvexHull();
Env.Editor.WriteMessage("//计算二维凸包geo: " + geo + "\n");
Env.Editor.WriteMessage("//计算二维凸包Convex hull geometry: " + 二维凸包 + "\n");
//检测一个环是否是简单的(IsSimple)复杂的示例（IsSimple=false，自相交）：
var points2 = new Coordinate[] {
new Coordinate(2,1), new Coordinate(3, 1),new Coordinate(1,4), new Coordinate(4, 4),
new Coordinate(2, 1),};
var ring = new LinearRing(points2);
ed.WriteMessage("//检测一个环是否是简单的(true)、(自相交false) " + ring.IsSimple + "\n");
var ring2 = new LinearRing(points2);
ed.WriteMessage("//检测多边形的顺逆时针 rings2是： " + (ring2.IsCCW ? "逆时针" : "顺时针") + "\n");
多边形的凹凸(convex / concave) 和 顺(Clockwise)/ 逆(CounterClockwise)时针
3.1 多边形的凹凸定义：
凸多边形（convex）： 所有的内角都小于180°；
凹多边形（concave）： 至少有一个内角大于180°；
///
//在C#环境中，使用NetTopologySuite.IO.ShapeFile通常涉及以下步骤：
//1.引入必要的NuGet包，如NetTopologySuite和NetTopologySuite.IO。
//2.创建`ShapefileReader`或`ShapefileWriter`对象来读取或写入Shapefile。
//3.使用`ReadShape()`或`ReadFeature()`方法获取Shapefile中的几何对象和属性。
//4.对数据进行操作，如计算几何、筛选属性等。
//5.使用`WriteShape()`或`WriteFeature()`方法将修改后的数据写回Shapefile。
string path = @"C:\Users\Administrator\Desktop\黄岗寺\黄岗寺.shp";
// 检查文件是否存在
if (!File.Exists(path))
{
ed.WriteMessage("Shapefile not found.\n");
return;
}
ShapefileReader reader = new ShapefileReader(path);
/***** 读取dbf文件 ******/
string dbfPath = @"C:\Users\Administrator\Desktop\黄岗寺\黄岗寺.dbf";
if (!File.Exists(dbfPath))
{
ed.WriteMessage("dbf not found.\n");
return;
}
using var dbf = new DbfReader(dbfPath);
foreach (var record in dbf)
{
foreach (var fieldName in record.GetNames())
{
ed.WriteMessage($"{fieldName,10} {record[fieldName]}\n");
}
}
/************ 读取shp文件 *************/
string shpPath = @"C:\Users\Administrator\Desktop\黄岗寺\黄岗寺.shp";
if (!File.Exists(shpPath))
{
ed.WriteMessage("dbf not found.\n");
return;
}
//foreach (var geometry in Shapefile.ReadAllGeometries(shpPath))
//{
// Console.WriteLine(geometry);
//}
var features = NetTopologySuite.IO.Esri.Shapefile.ReadAllFeatures(shpPath);
int i = 0;
foreach (var feature in features)
{
i++;
//此时通过NTS库读取的Geometry SRID为0，没有坐标系
var geometry = feature.Geometry;
ed.WriteMessage(@$"geometry{i}:" + geometry + "\n");
//这一步为Geometry添加4326坐标系
var geometryForWGS84 = GeometryFactory.Default.WithSRID(4326).CreateGeometry(geometry);
ed.WriteMessage("wkbForWGS84："+ geometryForWGS84 + "\n");
}
}
}
}