Create a new MouseReleased instance.
|pos:||an Array for the new position of the mouse cursor. The point [0,0] is the top-left corner of the window (or the screen if running full-screen). (Array, required)|
|rel:||an Array for the position change since the last MouseMoved event, in pixels. (Array, required)|
|buttons:||an Array of symbols for the mouse buttons that were being held down while the mouse was moving.  if no buttons were being held. (Array, optional)|
# File lib/rubygame/events/mouse_events.rb, line 140 def initialize( pos, rel, buttons= ) @pos = pos.to_ary.dup @pos.freeze @rel = rel.to_ary.dup @rel.freeze @buttons = buttons.to_ary.dup @buttons.freeze end