问JAVA :点在多边形中？如何检查用户的位置是否落在一个kml多边形内？

EN

import org.locationtech.jts.geom.*;

// parse KML using JAK or another library
// ...
GeometryFactory gf = new GeometryFactory();
// create polygon
int numPoints = ...
Coordinate[] points = new Coordinate[numPoints];
// set points
points[0] = new Coordinate(...);
//...
LinearRing jtsRing = gf.createLinearRing(points);
Polygon poly = gf.createPolygon(jtsRing, null);

// now create point to test if contained inside polygon
Coordinate coord = new Coordinate(lon, lat);
Point pt = gf.createPoint(coord);
if (poly.contains(pt)) {
  // point is contained within bounds of polygon
  // do something here
}