API Reference


getMouseWheel() → {number}

Returns the change in the mouse wheel that happened this frame. This is a delta, that is, it's how much the mouse wheel moved on this frame.

A positive number means the user is scrolling up, a negative number means down. For an idea of the magnitude of this number: using a typical PC mouse with a discrete-step mousewheel, turning the wheel by one step will give a reading of 0.1 on the frame when the movement happens.

On Mac OS with a touchpad, the "mousewheel" corresponds to sliding up/down with two fingers on the touchpad and happens continuously (not by discrete steps), so you will read different values every frame while the movement is happening.

Returns:
The movement delta in the mouse wheel that happened this frame. If the mouse wheel hasn't moved this frame, this returns 0.
Type
number

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