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This is a car driving tutorial using the three main features above

Directional_velocity works with angles

Goal: Use <- & -> arrow key to turn car clockwise or anticlockwise
use /\ & \/ arrow key to accelerate and decelerate respectively.

Create your car(s) actor then load 8 multiple animation files ("anim00*x*.imgfile") rotated with 45° difference
In an create actor script: Change Anim direction"stopped"

In a key down script : left (right): Change Anim Dir "forward"("backward")
//Based on the degree difference between sprites

in a key down script up ( down) -> Script Editor:

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 directional_velocity =5; //for the brackets...
directional_velocity =-5; // They works with the direction of the angle

key up left or right: Change anim directioj "stopped"

Key up Up or down :

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directional_velocity =0;

in a draw actor script:

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angle = animpos * 45 // if animpos is 1 angle is 45 etc.

If you still don't get it here is a eemo \/