Chipmunk query of single body near a point

[Zhiyu_Zhou]

Hi,

I am trying to query a shape within a distance from a point. The closest API I can find is NearestPointQueryNearest() inside cpSpaceQuery.h/.c, which returns the nearest shape. However, I don't need to get the nearest shape, just the first shape for performance reasons. I think NearestPointQueryNearest() is going through all shapes found within the radius and returning the shape with minimal distance, but I cannot see the implementation of query() inside the cpSpatialIndex.h

Is it possible to do an early return after at least one match was found during the query?

[slembcke]

Not sure if I understand your use case. If your query radius is very small, it should return very quickly. If it's very large, then the first shape found might be very far from the query point.

You can do what you want with cpSpacePointQuery() and a private API function. There is no built in way to break the iteration, but it's safe to use setjmp/longjmp. The only catch is that you need to call cpSpaceUnlock(space, cpTrue) from the private header afterwards.

[Zhiyu_Zhou]

Thansk for the help. I will give it a try tonight.