Game Development Reference
In-Depth Information
14. The line the player just drew between
_rocket
and pivot point, which we get by
subtracting (
Point.subtract
) those two points, has two perpendicular vec-
tors: one to the right (clockwise) that you get through
Point.getRPerp
and
one to the left (counterclockwise) that you get through
Point.getPerp
. We
use the angle of one of these vectors as the
_rocket
target rotation so the rocket
will rotate to be at 90 degrees with the line drawn in
LineContainer
. And we
find the correct perpendicular through the dot product of the
_rocket
current
vector and one of the perpendiculars (
Point.dot
).
