overviewer/Minecraft-Overviewer — pull request #1043 by ion1 (2013-12-25 04:18:17+00:00)
Title: Render tiles in an expanding order from the center

To do: render the four top-level quadrants simultaneously. Currently the quadrant 0 is finished (beginning from the corner closest to the middle of the world) before moving to quadrant 1 etc.