vspeed

vspeed is one of the "built in" properties that all instances have and defines the vertical movement speed (along the y-axis) of the instance in pixels per step. So, a vspeed of 3 means 3 pixels of movement to the bottom (+y) every step, and a vspeed of -3 would mean 3 pixels of movement to the top (-y) every step.

Note that if you set the speed and/or direction variables then the vspeed value will be updated automatically to reflect these changes, and likewise, changing the vspeed value will also affect the speed and direction values. Also note that gravity, gravity_direction and friction can all modify the value of this variable when they are used in your games.

Syntax:

vspeed;

Returns:

Real (single precision floating point value)

Example:

if (keyboard_check(vk_up)) vspeed = -5;
if (keyboard_check(vk_down)) vspeed = 5;

The above code will change the vertical speed depending on which keys are pressed.