Returns the built-in S2ShapeIndex associated with every S2Polygon. This
can be used in conjunction with the various S2ShapeIndex query classes
(S2ClosestEdgeQuery, S2BooleanOperation, etc) to do things beyond what is
possible with S2Polygon built-in convenience methods.
For example, to measure the distance from one S2Polygon to another, you
can write:
S2ClosestEdgeQuery query(&polygon1.index());
S2ClosestEdgeQuery::ShapeIndexTarget target(&polygon2.index());
S1ChordAngle distance = query.GetDistance(&target);
The index contains a single S2Polygon::Shape object.
Returns the built-in S2ShapeIndex associated with every S2Polygon. This can be used in conjunction with the various S2ShapeIndex query classes (S2ClosestEdgeQuery, S2BooleanOperation, etc) to do things beyond what is possible with S2Polygon built-in convenience methods.
For example, to measure the distance from one S2Polygon to another, you can write: S2ClosestEdgeQuery query(&polygon1.index()); S2ClosestEdgeQuery::ShapeIndexTarget target(&polygon2.index()); S1ChordAngle distance = query.GetDistance(&target);
The index contains a single S2Polygon::Shape object.