The ID number of the current pixel. Reccommended if performance profiling shows string comparision is a bottleneck.
The ID of the element for which this is being called. (in a ElementDataUnknown.liveCell that's the same as Rel.oldId, but in a ElementDataUnknown.deadCell it's the id that the deadCell belongs to.
The X location of this pixel.
The Y location of this pixel.
The argument to ElementDataUnknown.liveCell and ElementDataUnknown.deadCell