Physics object orientation left/right

Sprite[Physics].VelocityX[/code:1n72dx8u]
this is an expression under the 'physics' tab when you double click your sprite
and will return the left and or right speed of your object
if Sprite[Physics].VelocityX is less than 0 it's going left, and if it's greater than 0 it's going to the right

if you only want a simple left or right value:
direction will be either -1 for left, 0 for not moving, or 1 for right if you :
[code:1n72dx8u]
direction = Sprite[Physics].VelocityX/abs(Sprite[Physics].VelocityX)[/code:1n72dx8u]
abs is found under the system object and is the absolute value function 

if you want more than just left or right and you want the actual angle it's moving at, that is also possible:
[code:1n72dx8u]angle(0, 0, Sprite[Physics].VelocityX, Sprite[Physics].VelocityY)[/code:1n72dx8u]

with bullet it would be the same thing, but with Sprite[Bullet].VectorX, etc instead of Sprite[Physics].VelocityX

if you need the family to be both bullets and physics, there is a messier way to do it:

make each object have a private variable LastX that gets set to the current x value at the end of each tick

for left and right
[code:1n72dx8u]LeftorRightness=sprite('LastX')-Sprite.x[/code:1n72dx8u]
single left right value:
[code:1n72dx8u]Xdirection=abs(sprite('LastX')-Sprite.x)/(sprite('LastX')-Sprite.x)[/code:1n72dx8u]
for exact angle 
[code:1n72dx8u]anglemovingat = angle(sprite('LastX'), sprite('LastY'), Sprite.X, Sprite.Y)[/code:1n72dx8u]
the last action after getting this info should be:
[code:1n72dx8u]sprite('LastX')=Sprite.X
sprite('LastY')=Sprite.Y[/code:1n72dx8u]
so that next tick, lastx and lasty will always equal the previous ticks x and y values