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/*
Use the scrollwheel to tween between different points and orientations
scrubber = new MX.Scrubber(cam, [
{
position: [0, viewHeight, -1000],
rotation: [0, 0]
},
{
position: [0, 1000, 1000],
rotation: [0, Math.PI]
},
{
position: [0, viewHeight, -1000],
rotation: [0, 2*Math.PI]
},
{
position: [0, viewHeight, -2000],
rotation: [0, 0]
}
])
// in your animate function:
scrubber.update()
*/
MX.Scrubber = function (obj, points) {
obj = obj || {}
points = points || {}
var reversible = true, loop = false;
var total = points.length * 100,
distance = 0
destination = 0,
last_index = -1,
last_name = null,
locked = false,
point_count = points.length + (loop+0)
var avg_speed = scroll_avg_speed = 5,
click_avg_speed = 20,
webkit_ratio = 0.02
if (points[0].position) {
points.forEach(function(p){
p.x = p.position[0]
p.y = p.position[1]
p.z = p.position[2]
p.rotationX = p.rotation[0]
p.rotationY = p.rotation[1]
})
}
document.addEventListener('touchstart', next, false);
document.addEventListener('mousedown', next, false);
document.addEventListener('mousewheel', onDocumentMouseWheel, false);
document.addEventListener('DOMMouseScroll', onDocumentMouseWheel, false);
function onDocumentMouseWheel (e) {
if (locked) return
var delta = 0;
// WebKit
if ( event.wheelDeltaY ) {
delta -= event.wheelDeltaY * webkit_ratio
}
// Opera / Explorer 9
else if ( event.wheelDelta ) {
delta -= event.wheelDelta * webkit_ratio
}
// Firefox
else if ( event.detail ) {
delta += event.detail * 2
}
if (! reversible && delta < 0) return;
if (destination < total-100 || delta < 0) {
e.preventDefault()
}
else {
return
}
destination += delta
avg_speed = scroll_avg_speed
}
function add_point(point){
if (point.type == "Camera") {
point = {
position: [ point.x, point.y, point.z ],
rotation: [ point.rotationX, point.rotationY ],
callback: noop
}
}
points.push(point)
total = points.length * 100
}
function reset(){
distance = destination = 0
last_index = -1
last_name = null
}
function next(){
destination = ~~(destination/100) * 100
destination += 100
avg_speed = click_avg_speed
}
function update(){
if (locked) return
if (destination > total-100) destination = total-100
distance = avg(distance, destination, avg_speed)
var ratio = distance / total
if (! loop) {
if (ratio < 0) {
destination = 0
ratio = 0
}
else if (ratio > 1) {
destination = total
ratio = 1
}
}
var diff = ratio * point_count
var step = (distance % 100) / 100
var src = ~~clamp(diff, 0, point_count-1)
var halfway = ~~clamp(diff + 0.5, 0, point_count-1)
var dest = ~~clamp(diff + 1, 0, point_count-1)
if (halfway != last_index) {
last_index = halfway
if (points[last_index].name != last_name) {
last_name = points[last_index].name
}
$("#info .active").removeClass("active")
$("#info div[data-name='" + last_name + "']").addClass("active")
points[halfway].callback && points[halfway].callback()
}
var ry0 = points[src].rotationY
var ry1 = points[dest].rotationY
if (abs(ry0 - ry1) == TWO_PI) {
ry0 = ry1
}
obj.x = lerp(step, points[src].x, points[dest].x)
obj.y = lerp(step, points[src].y, points[dest].y)
obj.z = lerp(step, points[src].z, points[dest].z)
obj.rotationX = lerp(step, points[src].rotationX, points[dest].rotationX)
obj.rotationY = lerp(step, ry0, ry1)
if (obj.rotationY > PI) { obj.rotationY -= TWO_PI }
}
var scrubber = {
init: function(){
app && app.movements && app.movements.lock()
},
lock: function(){
app && app.movements && app.movements.unlock()
locked = true
},
unlock: function(){
app && app.movements && app.movements.lock()
locked = false
},
step: function(n){
distance = destination = n * 100
},
add_point: add_point,
reset: reset,
next: next,
update: update,
obj: obj,
points: points
}
return scrubber;
}
|
