# Move the mouse across the image # to change its value value = 0 def draw(): fill(value) rect(25, 25, 50, 50) def mouseMoved(): global value value = value + 5 if value > 255: value = 0
THIS EXAMPLE IS BROKEN
The mouseMoved() function is called every time the mouse moves and a mouse button is not pressed. (If a button is being pressed, mouseDragged() is called instead.)
Mouse and keyboard events only work when a program has draw(). Without draw(), the code is only run once and then stops listening for events.