how do you do a throw that affect by gravity/platform?
With platform-behavior I would use Vector X and Vector Y they are depending on the parameters of the platform-behavior.
Something like:
+ Mouse: On any click
-> Sprite: Set Platform vector X to 750
-> Sprite: Set Platform vector Y to -500
With the parameters:
Max Speed = 750
Acceleration = 5000
Declaration = 500
Gravity = 1000
Max fall speed = 500
You can set the parameter on the fly or in the behavior settings. You have to teak them until you are satisfied.