mover

class Mover
    constructor: (@shape,@speed)->
        @up=false
        @down=false
        @right=false
        @left=false
        document.onkeyup=@onKeyUp
        document.onkeydown=@onKeyDown

    onKeyDown: (e)=>
        if e?
            switch e.keyCode
                when 37 #left
                    @left=true
                    @right=false
                when 38 #up
                    @up=true
                    @down=false
                when 39 #right
                    @right=true
                    @left=false
                when 40 #down
                    @down=true
                    @up=false
    onKeyUp: (e)=>
        alert "up"
        if e?
            switch e.keyCode
                when 37
                    @left=false
                when 38
                    @up=false
                when 39
                    @right=false
                when 40
                    @down=false
    tick: (elapsedTime)=>
        if @up then @shape.y=@shape.y - @speed
        if @down then @shape.y=@shape.y + @speed
        if @right then @shape.x=@shape.x + @speed
        if @left then @shape.x=@shape.x - @speed