Fixed performance bug in map zoom, along with big error in the way the draw method was getting called from an event handler.
Fixed performance bug in map zoom, along with big error in the way the draw method was getting called from an event handler.

aashish24/tangelo,ecohealthalliance/tangelo,Kitware/tangelo,aashish24/tangelo,mathstuf/tangelo,ecohealthalliance/tangelo,mathstuf/tangelo,Kitware/tangelo,aashish24/tangelo,ecohealthalliance/tangelo,Kitware/tangelo,mathstuf/tangelo