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//
// worker.js - version 0.91
// a graph vizualization toolkit
//
// Copyright (c) 2011 Samizdat Drafting Co.
// Physics code derived from springy.js, copyright (c) 2010 Dennis Hotson
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
//
// worker.js
//
// wraps physics.js in an onMessage/postMessage protocol that the
// Kernel object can deal with
//
importScripts('atoms.js');
importScripts('barnes-hut.js');
importScripts('physics.js');
// alias over the missing jquery utils so we can run in a worker
$ = {
each:function(obj, callback){
if ($.isArray(obj)){
for (var i=0, j=obj.length; i<j; i++) callback(i, obj[i])
}else{
for (var k in obj) callback(k, obj[k])
}
},
map:function(arr, fn){
var out = []
$.each(arr, function(i, elt){
var result = fn(elt, i)
if (result!==undefined) out.push(result)
})
return out
},
isArray:function(obj){
return (obj.constructor.toString().indexOf("Array") != -1)
},
inArray:function(elt, arr){
for (var i=0, j=arr.length; i<j; i++) if (arr[i]===elt) return i;
return -1
}
}
// endalias
var PhysicsWorker = function(){
var _timeout = 20
var _physics = null
var _physicsInterval = null
var _lastTick = null
var times = []
var last = new Date().valueOf()
var that = {
init:function(param){
that.timeout(param.timeout)
_physics = Physics(param.dt, param.stiffness, param.repulsion, param.friction, that.tock)
return that
},
timeout:function(newTimeout){
if (newTimeout!=_timeout){
_timeout = newTimeout
if (_physicsInterval!==null){
that.stop()
that.go()
}
}
},
go:function(){
if (_physicsInterval!==null) return
// postMessage('starting')
_lastTick=null
_physicsInterval = setInterval(that.tick, _timeout)
},
stop:function(){
if (_physicsInterval===null) return
clearInterval(_physicsInterval);
_physicsInterval = null;
// postMessage('stopping')
},
tick:function(){
// iterate the system
_physics.tick()
// but stop the simulation when energy of the system goes below a threshold
var sysEnergy = _physics.systemEnergy()
if ((sysEnergy.mean + sysEnergy.max)/2 < 0.05){
if (_lastTick===null) _lastTick=new Date().valueOf()
if (new Date().valueOf()-_lastTick>1000){
that.stop()
}else{
// postMessage('pausing')
}
}else{
_lastTick = null
}
},
tock:function(sysData){
sysData.type = "geometry"
postMessage(sysData)
},
modifyNode:function(id, mods){
_physics.modifyNode(id, mods)
that.go()
},
modifyPhysics:function(param){
_physics.modifyPhysics(param)
},
update:function(changes){
var epoch = _physics._update(changes)
}
}
return that
}
var physics = PhysicsWorker()
onmessage = function(e){
if (!e.data.type){
postMessage("¿kérnèl?")
return
}
if (e.data.type=='physics'){
var param = e.data.physics
physics.init(e.data.physics)
return
}
switch(e.data.type){
case "modify":
physics.modifyNode(e.data.id, e.data.mods)
break
case "changes":
physics.update(e.data.changes)
physics.go()
break
case "start":
physics.go()
break
case "stop":
physics.stop()
break
case "sys":
var param = e.data.param || {}
if (!isNaN(param.timeout)) physics.timeout(param.timeout)
physics.modifyPhysics(param)
physics.go()
break
}
}
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