ArcGIS Runtime SDK for iOS(五) --- 空间几何分析与操作（上）

2016.4.16 武汉 大雨
by SevenJohs.

• 概述

   空间几何分析功能做为GIS重要的功能，在应用研发上需要十分熟悉这类功能，通过使用AGSGeometryEngine可以实现对几何拓扑、距离以及关联运算。

• 主要内容

  • 空间分析基础知识与对应AGSGeometryEngine方法
  • 自己写的简单Demo

• 空间分析基础知识

  • TopoLogicalAnalysis(只介绍GIS应用开发中最常用的)

    • Boundary
      -Geometry对象的边界：
      polygon由polyline组成；polyline 由point组成。
    • Clip
      - 几何裁剪
      -(AGSGeometry*)clipGeometry:(AGSGeometry*)geometry withEnvelope:(AGSEnvelope*)envelope;
    • Cut
      - 从中心分开几何
      变为左右两个geometry。
      -(NSArray*)cutGeometry:(AGSGeometry*)geometry withCutter:(AGSPolyline*)cutter;

    • Buffer
      - 缓冲区
      在几何对象的基础上向四周等距离填充。
      -(AGSMutablePolygon*)bufferGeometries:(NSArray*)geometries byDistance:(double)distance;
-(AGSMutablePolygon*)bufferGeometry:(AGSGeometry*)geometry byDistance:(double)distance;

    • Union
      - 并集
      -(AGSGeometry*)unionGeometries:(NSArray*)geometries;

    • Intersect
      - 交集
      -(AGSGeometry*)intersectionOfGeometry:(AGSGeometry*)geometry1 andGeometry:(AGSGeometry*)geometry2;

    • Different
      - 减法
      -(AGSGeometry*)differenceOfGeometry:(AGSGeometry*)geometry1 andGeometry:(AGSGeometry*)geometry2;

  • RelationLogicalAnalysis(只介绍常用的)，返回BOOL

    • Contains
      -A包含B关系判断
      -(BOOL)geometry:(AGSGeometry*)geometry1 containsGeometry:(AGSGeometry*)geometry2;
    • Within
      -A包含于B关系判断
      -(BOOL)geometry:(AGSGeometry*)geometry1 withinGeometry:(AGSGeometry*)geometry2;
    • Crosses
      - 相交关系判断
      -(BOOL)geometry:(AGSGeometry*)geometry1 crossesGeometry:(AGSGeometry*)geometry2;
    • Touches
      - 相连关系判断
      -(BOOL)geometry:(AGSGeometry*)geometry1 touchesGeometry:(AGSGeometry*)geometry2;
    • Disjoint
      - 不相交关系判断
      -(BOOL)geometry:(AGSGeometry*)geometry1 disjointToGeometry:(AGSGeometry*)geometry2;
    • Overlaps
      - 重叠关系判断
      -(BOOL)geometry:(AGSGeometry*)geometry1 overlapsGeometry:(AGSGeometry*)geometry2;

  • ProximityLogicalAnalysis(只介绍常用的)，返回最近的距离的点（坐标），或距离

    • Vertex
      -只包含顶点的最近的点判断
      -(AGSProximityResult*)nearestVertexInGeometry:(AGSGeometry*)geometry toPoint:(AGSPoint*)point;
    • Coordinate
      -包含整个Geometry的最近的点判断
      -(AGSProximityResult*)nearestCoordinateInGeometry:(AGSGeometry*)geometry toPoint:(AGSPoint*)point;

  -空间分析，简单Demo
  待续