1 阐明

jsts 齐全就是依据其老妈 jts 的 java 包构造移植的,除了局部剖析性能须要额定留神外,基本上所有的子模块的根门路位于 jsts/org/locationtech/jts 模块下。

Geometry 类

Geometry 类合乎 OGC 简略因素标准的设计。它有若干个子类,例如点线面等。

Geometry 在 JTS 上有十分多实用的空间剖析函数:

buffer, buffer, buffer, compareTo, compareTo, contains, convexHull, copy, coveredBy, covers, crosses, difference, disjoint, distance, equals, equals, equalsExact, equalsNorm, equalsTopo, geometryChanged, getArea, getCentroid, getEnvelope, getEnvelopeInternal, getFactory, getGeometryN, getInteriorPoint, getLength, getNumGeometries, getPrecisionModel, getSRID, getUserData, hashCode, intersection, intersects, isRectangle, isValid, isWithinDistance, norm, overlaps, relate, relate, setSRID, setUserData, symDifference, toString, toText, touches, union, union, within

然而不见得所有的都在 JSTS 中有,见第 3 节的 buffer 举例。

turf 的剖析函数在特定条件下是计算失败的(已验证),所以我才不得不求助于 JSTS

2 装置

pnpm add jsts && pnpm add @types/jsts --save-dev# ornpm install jsts && npm install @types/jsts --save-dev# oryarn add jsts && yarn add @types/jsts --save-dev

@types/jsts 是类型提醒库

3 应用

以 buffer 为例

import JSTSWKTReader from 'jsts/org/locationtech/jts/io/WKTReader'import JSTSGeoJSONWriter from 'jsts/org/locationtech/jts/io/GeoJSONWriter'import JSTSBufferOp from 'jsts/org/locationtech/jts/operation/buffer/BufferOp'const wkt = `POINT (0 0)`const bufferCenter = new JSTSWKTReader().read(wkt)const bufferResult = JSTSBufferOp.bufferOp(  bufferCenter,  this.bufferRadius) // instanceof Geometryconst bufferResultGeoJSON = new JSTSGeoJSONWriter().write(bufferResult)

4 JTS 文档

http://locationtech.github.io...