Previously, the way in which the spaceship steered depended
on the rendered framerate.
This moves ship movement to the physics step to avoid this, and
enables physics interpolation for smooth motion.
* navigation_astar: replace deprecated TileMap with TileMapLayer
* navigation_astar: use get_used_cells() instead of iterating over region
This also removes the confusing use of Tile.OBSTACLE. The tile enum is
mostly used for atlas coordinates but in this case it is compared with
the source id which only happens to be zero as well.
* navigation_astar: use constants for atlas coordinates
This makes it more obvious how to set cells in larger tilesets where the
second position is not zero.
It also removes the constant OBSTACLE which is unused since the last
commit.
* navigation_astar: mention get_used_rect()
Using it in this example is more complex (as the border has no cells)
but it's good to know.
This leads to code that is easier to understand and runs
faster thanks to GDScript's typed instructions.
The untyped declaration warning is now enabled on all projects
where type hints were added. All projects currently run without
any untyped declration warnings.
Dodge the Creeps and Squash the Creeps demos intentionally don't
use type hints to match the documentation, where type hints haven't
been adopted yet (given its beginner focus).
Opened them, saved all scenes, ran the project. Did necessary fixes here and there,
fixed some warnings (but some remain in bigger demos).
Did not port JRPG demo yet (#306) nor the two platformer demos.
