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