Unit selection

[FolkertVanVerseveld]

Proper unit selection, player or gaia units, as well as static (e.g. trees, berry bushes) and dynamic resources (e.g. gazelle, lions) is difficult.

As far as I can tell, the original game does bounds checking as follows:

• [x] Determine all objects that contain the mouse cursor
• [x] For each building:
  • [x] Select the building if the mouse cursor is in the diamond base shape
  • [x] Otherwise: select the building if the mouse is pixel perfect colliding.
• [x] For each unit:
  • [x] Select unit if rectangular object boundaries collide with cursor.

See screenshot for example: