geotools判断一个点是否在多边形上

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判断一个点是否在多边形上,GIS里经常要用的功能,但在平面几何上也是可用的。

这里借助大名鼎鼎的geotools实现

jar包依赖,pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.wisely</groupId>
<artifactId>point</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<geotools.version>13.1</geotools.version>
</properties>

<dependencies>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-geojson</artifactId>
<version>${geotools.version}</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-geometry</artifactId>
<version>${geotools.version}</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-epsg-hsql</artifactId>
<version>${geotools.version}</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-jts-wrapper</artifactId>
<version>${geotools.version}</version>
</dependency>
</dependencies>

<repositories>
<repository>
<id>maven2-repository.dev.java.net</id>
<name>Java.net repository</name>
<url>http://download.java.net/maven/2</url>
</repository>
<repository>
<id>osgeo</id>
<name>Open Source Geospatial Foundation Repository</name>
<url>http://download.osgeo.org/webdav/geotools/</url>
</repository>
</repositories>

</project>

代码：

String wktPoly = "POLYGON ((30 10, 40 40, 20 40, 10 20, 30 10))"; //请自行搜素了解wkt格式
String wktPoint = "POINT (30 30)";
WKTReader reader = new WKTReader(JTSFactoryFinder.getGeometryFactory());
GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null);
Geometry point = reader.read(wktPoint);
Geometry poly = reader.read(wktPoly);
poly.contains(point); //返回true或false

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