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// Usage:
//
// var control = new MX.RotationControl()
// control.init( object{MX.Object3D} [, listener{HTMLElement}] )
//
// In animation loop:
//
// control.update()
//
// The above code will register handler functions on `listener`
// and will be updating `object`s rotationX and rotationY
// If no `listener` is provided, will default to `object`s el.
MX.RotationControl = function () {
var object,
locked = false
var down = false,
active = false,
lastX,
lastY
var pointerLockPrefix =
'pointerLockElement' in document ? '' :
'mozPointerLockElement' in document ? 'moz' :
'webkitPointerLockElement' in document ? 'webkit' : null,
hasPointerLock = !(pointerLockPrefix === null)
pointerLockEnabled = false
var pub = {
sensitivity : .5,
ease : 10,
drag : true,
inverseX : false,
inverseY : false,
disableX : false,
disableY : false,
rotationX : 0,
rotationY : 0,
upperBoundX : undefined,
lowerBoundX : undefined,
upperBoundY : undefined,
lowerBoundY : undefined,
usePreset: function (name) {
var ops = presets[name]
if (ops) {
if (currentPreset && presets[currentPreset].teardown) {
presets[currentPreset].teardown()
}
for (var op in ops) {
if (op !== 'setup' && op !== 'teardown') {
pub[op] = ops[op]
}
}
if (op.setup) ops.setup()
}
}
}
var currentPreset
var presets = {
firstPerson: {
drag: false,
ease: 2,
sensitivity: .18,
inverseX: true,
inverseY: true,
upperBoundX: MX.rotationUnit === 'deg' ? 90 : Math.PI / 2,
lowerBoundX: MX.rotationUnit === 'deg' ? -90 : -Math.PI / 2
},
skybox: {
sensitivity: .18,
inverseX: true,
inverseY: true,
upperBoundX: MX.rotationUnit === 'deg' ? 90 : Math.PI / 2,
lowerBoundX: MX.rotationUnit === 'deg' ? -90 : -Math.PI / 2
}
}
function init (obj, lis) {
if (active) return
object = obj
pub.rotationX = object.rotationX
pub.rotationY = object.rotationY
if (lis instanceof HTMLElement) {
listener = lis
} else if (lis instanceof MX.Object3D) {
listener = lis.el
} else {
listener = window.document
}
listener.addEventListener('mousedown', onDown)
listener.addEventListener('mousemove', onMove)
listener.addEventListener('mouseup', onUp)
listener.addEventListener('touchstart', onDown)
listener.addEventListener('touchmove', onMove)
listener.addEventListener('touchend', onUp)
active = true
}
function changeObject (obj) {
object = obj
pub.rotationX = object.rotationX
pub.rotationY = object.rotationY
}
function changeListener (lis) {
remove()
active = false
init(object, lis)
if (pointerLockEnabled) {
initPointerLock()
}
}
function remove () {
if (!active) return
listener.removeEventListener('mousedown', onDown)
listener.removeEventListener('mousemove', onMove)
listener.removeEventListener('mouseup', onUp)
listener.removeEventListener('touchstart', onDown)
listener.removeEventListener('touchmove', onMove)
listener.removeEventListener('touchend', onUp)
if (hasPointerLock) {
document.removeEventListener(pointerLockPrefix + 'pointerlockchange', onPointerLockChange)
document.removeEventListener('mousemove', onPointerLockMove)
document.body[pointerLockPrefix + (pointerLockPrefix ? 'E' : 'e') + 'xitPointerLock']()
}
active = false
}
function onDown (e) {
e = normalizeEvent(e)
if (!e) return
down = true
lastX = e.pageX
lastY = e.pageY
}
function onMove (e) {
if (e.type = 'touchmove') {
e.preventDefault()
}
if (pub.drag && !down) return
e = normalizeEvent(e)
if (!e) return
lastX = lastX || e.pageX
lastY = lastY || e.pageY
var dx = e.pageX - lastX,
dy = e.pageY - lastY
lastX = e.pageX
lastY = e.pageY
updateTarget(dx, dy)
}
function onUp () {
down = false
}
function initPointerLock () {
if (pointerLockEnabled) return
document.addEventListener(pointerLockPrefix + 'pointerlockchange', onPointerLockChange)
document.addEventListener('mousemove', onPointerLockMove)
document.body[pointerLockPrefix + (pointerLockPrefix ? 'R' : 'r') + 'equestPointerLock']()
}
function onPointerLockChange () {
var el = document.body
if (document[pointerLockPrefix + (pointerLockPrefix ? 'P' : 'p') + 'ointerLockElement'] === el) {
pointerLockEnabled = true
} else {
pointerLockEnabled = false
}
}
function onPointerLockMove (e) {
if (!pointerLockEnabled) return
var dx = e[pointerLockPrefix + (pointerLockPrefix ? 'M' : 'm') + 'ovementX'],
dy = e[pointerLockPrefix + (pointerLockPrefix ? 'M' : 'm') + 'ovementY']
updateTarget(dx, dy)
}
function normalizeEvent (e) {
if (e.touches) {
return e.touches.length > 1 ? false : e.touches[0]
} else {
return e
}
}
function updateTarget (dx, dy) {
if (pub.inverseX) dx = -dx
if (pub.inverseY) dy = -dy
if (MX.rotationUnit !== 'deg') {
dx = MX.toRad(dx)
dy = MX.toRad(dy)
}
if (!pub.disableX) {
pub.rotationX -= dy * pub.sensitivity
if (pub.upperBoundX) pub.rotationX = Math.min(pub.rotationX, pub.upperBoundX)
if (pub.lowerBoundX) pub.rotationX = Math.max(pub.rotationX, pub.lowerBoundX)
}
if (!pub.disableY) {
pub.rotationY += dx * pub.sensitivity
if (pub.upperBoundY) pub.rotationY = Math.min(pub.rotationY, pub.upperBoundY)
if (pub.lowerBoundY) pub.rotationY = Math.max(pub.rotationY, pub.lowerBoundY)
}
}
function update () {
if (!object || locked) return
var dx = pub.rotationX - object.rotationX,
dy = pub.rotationY - object.rotationY
if (Math.abs(dx) < 0.0001) {
object.rotationX = pub.rotationX
} else {
object.rotationX += dx / pub.ease
}
if (Math.abs(dy) < 0.0001) {
object.rotationY = pub.rotationY
} else {
object.rotationY += dy / pub.ease
}
}
function lock () {
locked = true
}
function unlock () {
pub.rotationX = object.rotationX
pub.rotationY = object.rotationY
locked = false
}
pub.init = init
pub.remove = remove
pub.update = update
pub.lock = lock
pub.unlock = unlock
pub.initPointerLock = initPointerLock
pub.changeObject = changeObject
pub.changeListener = changeListener
return pub
}
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