codecombat/app/lib/surface/CoordinateDisplay.coffee

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2014-01-03 13:32:13 -05:00
module.exports = class CoordinateDisplay extends createjs.Container
layerPriority: -10
subscriptions:
'surface:mouse-moved': 'onMouseMove'
'surface:mouse-out': 'onMouseOut'
'surface:mouse-over': 'onMouseOver'
'camera:zoom-updated': 'onZoomUpdated'
constructor: (options) ->
super()
@initialize()
@camera = options.camera
console.error "CoordinateDisplay needs camera." unless @camera
@build()
@show = _.debounce @show, 250
Backbone.Mediator.subscribe(channel, @[func], @) for channel, func of @subscriptions
destroy: ->
Backbone.Mediator.unsubscribe(channel, @[func], @) for channel, func of @subscriptions
build: ->
@mouseEnabled = @mouseChildren = false
@addChild @label = new createjs.Text("", "20px Arial", "#003300")
@label.name = 'position text'
@label.shadow = new createjs.Shadow("#FFFFFF", 1, 1, 0)
onMouseOver: (e) -> @mouseInBounds = true
onMouseOut: (e) -> @mouseInBounds = false
onMouseMove: (e) ->
wop = @camera.canvasToWorld x: e.x, y: e.y
wop.x = Math.round(wop.x)
wop.y = Math.round(wop.y)
return if wop.x is @lastPos?.x and wop.y is @lastPos?.y
@lastPos = wop
@hide()
@show() # debounced
onZoomUpdated: (e) ->
@hide()
@show()
hide: ->
return unless @label.parent
@removeChild @label
@uncache()
show: =>
return unless @mouseInBounds and @lastPos
@label.text = "(#{@lastPos.x}, #{@lastPos.y})"
[width, height] = [@label.getMeasuredWidth(), @label.getMeasuredHeight()]
@label.regX = width / 2
@label.regY = height / 2
sup = @camera.worldToSurface @lastPos
@x = sup.x
@y = sup.y
@addChild @label
@cache -width / 2, -height / 2, width, height
Backbone.Mediator.publish 'surface:coordinates-shown', {}