Add a density auto-update.
Use an update countdown for density updates.
Reset the heatmap array each time it is set to refresh.
Need to remove old map before adding new refreshed map, and need to reset update count after an update.
Getting the update to refresh properly.
Changed the update to just add newly loaded strokes into the pointArray that contains the heatmap contents.
Added wrong variable name.
Remove strokeArray and just use pointArray.
Clear point array when a new density map is set.