jiayuasu commented on code in PR #1712:
URL: https://github.com/apache/sedona/pull/1712#discussion_r1879147274
##########
common/src/main/java/org/apache/sedona/common/Functions.java:
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@@ -80,6 +80,123 @@ public static double area(Geometry geometry) {
return geometry.getArea();
}
+ public static Geometry anchor(Geometry geometry) {
+ return anchor(geometry, 2, 0.2);
+ }
+
+ public static Geometry anchor(Geometry geometry, double stepSize) {
+ return anchor(geometry, stepSize, 0.2);
+ }
+
+ public static Geometry anchor(Geometry geometry, double stepSize, double
goodnessThreshold) {
+ if (geometry.getArea() <= 0) {
+ throw new IllegalArgumentException("Geometry must have a positive area");
+ }
+
+ GeometryFactory geometryFactory = new GeometryFactory();
+
+ // If the geometry is a collection, find the largest polygon
+ if (geometry instanceof GeometryCollection) {
+ GeometryCollection gc = (GeometryCollection) geometry;
+ Geometry largestPolygon = null;
+ double maxArea = Double.MIN_VALUE;
+
+ for (int i = 0; i < gc.getNumGeometries(); i++) {
+ Geometry geom = gc.getGeometryN(i);
+ double area = geom.getArea();
+ if (area > maxArea) {
+ largestPolygon = geom;
+ maxArea = area;
+ }
+ }
+
+ // Recursively process the largest polygon
+ if (largestPolygon instanceof Polygon) {
Review Comment:
+1. This function needs to be recursive.
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