###
TouchController (stick + buttons) for touch devices
Based on the touch demo by Seb Lee-Delisle
@class bkcore.controllers.TouchController
@author Thibaut 'BKcore' Despoulain
###
class TouchController
@isCompatible: ->
return ('ontouchstart' of document.documentElement);
###
Creates a new TouchController
@param dom DOMElement The element that will listen to touch events
@param stickMargin int The left margin in px for stick detection
@param buttonCallback function Callback for non-stick touches
###
constructor: (@dom, @stickMargin=200, @buttonCallback=null) ->
@active = true
@touches = null
@stickID = -1
@stickPos = new Vec2(0, 0)
@stickStartPos = new Vec2(0, 0)
@stickVector = new Vec2(0, 0)
@dom.addEventListener('touchstart', ((e)=> @touchStart(e)), false)
@dom.addEventListener('touchmove', ((e)=> @touchMove(e)), false)
@dom.addEventListener('touchend', ((e)=> @touchEnd(e)), false)
###
@private
###
touchStart: (event) ->
return if not @active
for touch in event.changedTouches
if @stickID < 0 and touch.clientX < @stickMargin
@stickID = touch.identifier
@stickStartPos.set(touch.clientX, touch.clientY)
@stickPos.copy(@stickStartPos)
@stickVector.set(0, 0)
continue
else
@buttonCallback?(on, touch, event)
@touches = event.touches
false
###
@private
###
touchMove: (event) ->
event.preventDefault()
return if not @active
for touch in event.changedTouches
if @stickID is touch.identifier and touch.clientX < @stickMargin
@stickPos.set(touch.clientX, touch.clientY)
@stickVector.copy(@stickPos).substract(@stickStartPos)
break
@touches = event.touches
false
###
@private
###
touchEnd: (event) ->
return if not @active
@touches = event.touches
for touch in event.changedTouches
if @stickID is touch.identifier
@stickID = -1
@stickVector.set(0, 0)
break
else
@buttonCallback?(off, touch, event)
false
###
Internal class used for vector2
@class Vec2
@private
###
class Vec2
constructor: (@x = 0, @y = 0) ->
substract: (vec) ->
@x -= vec.x
@y -= vec.y
@
copy: (vec) ->
@x = vec.x
@y = vec.y
@
set: (x, y) ->
@x = x
@y = y
@
###
Exports
@package bkcore
###
exports = exports ? @
exports.bkcore ||= {}
exports.bkcore.controllers ||= {}
exports.bkcore.controllers.TouchController = TouchController