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MX.FollowingOrbitCamera = function(opt){
var exports = {}, bound = false, portraitMode = false
exports.opt = opt = defaults(opt, {
el: window, // object to bind events on
camera: scene.camera, // camera object we'll be moving
radius: 100,
radiusRange: [ 10, 1000 ],
rotationX: Math.PI/2,
rotationY: 0,
rotationXRange: [ 0, 1 ],
rotationYRange: [ 0, 1 ],
center: { x: 0, y: 0, z: 0 },
sensitivity: 10, // moving 1 pixel is like moving N radians
wheelSensitivity: 10,
ease: 10,
})
var rx, ry, radius, px, py, epsilon = 1e-5, dragging = false
exports.init = function(){
ry = opt.rotationY
rx = opt.rotationX
radius = opt.radius
exports.wheel = new wheel({
el: opt.el,
update: function(e, delta){
opt.radius = clamp( opt.radius + delta * opt.wheelSensitivity, opt.radiusRange[0], opt.radiusRange[1] )
},
})
exports.bind()
}
exports.toggle = function(state){
if (state) exports.bind()
else exports.unbind()
}
exports.bind = function(){
if (bound) return;
bound = true
// opt.el.addEventListener("mousedown", down)
if (is_mobile) {
if ('DeviceOrientationEvent' in window) {
window.addEventListener("resize", resize)
window.addEventListener("deviceorientation", deviceorientation)
resize()
}
}
else {
window.addEventListener("mousemove", move)
}
// window.addEventListener("mouseup", up)
exports.wheel.unlock()
}
exports.unbind = function(){
if (! bound) return;
bound = false
// opt.el.removeEventListener("mousedown", down)
window.removeEventListener("mousemove", move)
// window.removeEventListener("mouseup", up)
exports.wheel.lock()
}
// function down (e) {
// px = e.pageX
// py = e.pageY
// dragging = true
// }
function move (e) {
// if (! dragging) return
// exports.delta(px - e.pageX, py - e.pageY)
exports.delta( e.pageX, e.pageY)
px = e.pageX
py = e.pageY
}
function resize (e) {
var aspect = window.innerHeight / window.innerWidth;
portraitMode = aspect >= 1;
}
function deviceorientation (e){
if (e && 'beta' in e && e.beta) {
var b, g
if (portraitMode) {
b = e.beta
g = e.gamma
} else {
b = e.gamma
g = e.beta
}
// console.log(b, g)
}
}
// function up (e) {
// dragging = false
// }
exports.delta = function(x,y){
// opt.rotationY += x/window.innerWidth * opt.sensitivity
// opt.rotationX = clamp( opt.rotationX + y/window.innerHeight * opt.sensitivity, 0, Math.PI)
opt.rotationY = lerp( x / window.innerWidth, opt.rotationYRange[0], opt.rotationYRange[1] )
opt.rotationX = lerp( y / window.innerHeight, opt.rotationXRange[0], opt.rotationXRange[1] )
}
exports.zoom = function(r){
opt.radius = r
}
exports.zoomDelta = function(r){
opt.radius += r
}
exports.move = function(y, x){
opt.rotationY = y
if (typeof x == "number") { opt.rotationX = x }
}
exports.update = function(){
if (Math.abs(ry - opt.rotationY) > epsilon) {
ry = avg(ry, opt.rotationY, opt.ease)
}
else {
ry = opt.rotationY
}
if (Math.abs(rx - opt.rotationX) > epsilon) {
rx = avg(rx, opt.rotationX, opt.ease)
}
else {
rx = opt.rotationX
}
if (Math.abs(radius - opt.radius) > epsilon) {
radius = avg(radius, opt.radius, opt.ease)
}
else {
radius = opt.radius
}
opt.camera.x = opt.center.x + radius * Math.sin(rx) * Math.cos(ry)
opt.camera.z = opt.center.y + radius * Math.sin(rx) * Math.sin(ry)
opt.camera.y = opt.center.z + radius * Math.cos(rx)
opt.camera.rotationX = Math.PI/2 - rx
opt.camera.rotationY = ry + Math.PI/2
}
return exports
}
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