Pooja444 commented on code in PR #621:
URL: https://github.com/apache/incubator-sedona/pull/621#discussion_r856843811
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core/src/main/java/org/apache/sedona/core/utils/GeomUtils.java:
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@@ -81,6 +84,38 @@ public static Geometry getInteriorPoint(Geometry geometry) {
return geometry.getInteriorPoint();
}
+ /**
+ * Return the nth point from the given geometry (which could be a
linestring or a circular linestring)
+ * If the value of n is negative, return a point backwards
+ * E.g. if n = 1, return 1st point, if n = -1, return last point
+ *
+ * @param lineString from which the nth point is to be returned
+ * @param n is the position of the point in the geometry
+ * @return a point
+ */
+ public static Geometry getNthPoint(LineString lineString, int n) {
+ if (lineString == null || n == 0) {
+ return null;
+ }
+
+ int p = lineString.getNumPoints();
+ if (Math.abs(n) > p) {
+ return null;
+ }
+
+ Coordinate[] nthCoordinate = new Coordinate[1];
+ if (n > 0) {
+ nthCoordinate[0] = lineString.getCoordinates()[n - 1];
+ } else {
+ nthCoordinate[0] = lineString.getCoordinates()[p + n];
+ }
+ return new Point(new CoordinateArraySequence(nthCoordinate),
lineString.getFactory());
+ }
+
+ public static Geometry getExteriorRing(Geometry geometry) {
+ return
geometry.getFactory().createLinearRing(geometry.getCoordinates());
Review Comment:
Sure, I updated this
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