Game Development Reference
In-Depth Information
class
TankPhysics
<
Component
# ...
def
change_direction
(new_direction)
change
=
(new_direction
-
object
.
direction
+ 360
)
% 360
change
= 360 -
change
if
change
> 180
if
change
> 90
@speed
= 0
elsif
change
> 45
@speed
*= 0.33
elsif
change
> 0
@speed
*= 0.66
end
object
.
direction
=
new_direction
end
# ...
end
Implementing Terrain Speed Penalties
Now, let's see how can we make terrain influence our movement. It sounds reasonable for
TankPhysics
to consult with
Map
about speed penalty of current tile:
# 06-physics/entities/map.rb
class
Map
# ...
def
movement_penalty
(x, y)
tile
=
tile_at(x, y)
case
tile
when
@sand
0.33
else
0
end
end
# ...
end
# 06-physics/entities/components/tank_physics.rb
class
TankPhysics
<
Component
# ...
def
update
# ...
speed
=
apply_movement_penalty(
@speed
)
shift
=
Utils
.
adjust_speed(speed)
# ...
end
