From b2b57a8db9df9241acd4fc91cb940fea305ecd4b Mon Sep 17 00:00:00 2001
From: Chas Emerick <cemerick@snowtide.com>
Date: Wed, 4 May 2011 08:00:12 -0400
Subject: [PATCH] added isRunning function

---
 src/kernel.js         | 24 ++++++++++++++++++------
 src/physics/system.js |  3 +++
 src/physics/worker.js |  2 +-
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/kernel.js b/src/kernel.js
index 5455aaf..d848999 100644
--- a/src/kernel.js
+++ b/src/kernel.js
@@ -25,6 +25,7 @@
     var _tickInterval = null
     var _lastTick = null
     var _paused = false
+    var _running = false
     
     var that = {
       system:pSystem,
@@ -98,11 +99,15 @@
       },
       
       workerMsg:function(e){
-        var type = e.data.type
-        if (type=='geometry'){
-          that.workerUpdate(e.data)
-        }else{
-          trace('physics:',e.data)
+        switch (e.data.type) {
+          case 'geometry':
+            that.workerUpdate(e.data)
+            break
+          case 'stopping':
+            _running = false
+            break
+          default:
+            trace('physics:',e.data)
         }
       },
       _lastPositions:null,
@@ -184,6 +189,7 @@
             // trace('stopping')
             clearInterval(_tickInterval)
             _tickInterval = null
+            _running = false;
           }else{
             // trace('pausing')
           }
@@ -222,6 +228,8 @@
           _tickInterval = setInterval(that.physicsUpdate, 
                                       that.system.parameters().timeout)
         }
+        
+        _running = true
       },
       stop:function(){
         _paused = true
@@ -233,7 +241,11 @@
             _tickInterval = null
           }
         }
-      
+        
+        _running = false;
+      },
+      isRunning:function() {
+        return _running;
       }
     }
     
diff --git a/src/physics/system.js b/src/physics/system.js
index a1877fb..52bd3d3 100644
--- a/src/physics/system.js
+++ b/src/physics/system.js
@@ -75,6 +75,9 @@
       stop:function(){
         state.kernel.stop()
       },
+      isRunning:function(){
+        return state.kernel.isRunning()
+      },
 
       addNode:function(name, data){
         // return that.newNode(name,data)
diff --git a/src/physics/worker.js b/src/physics/worker.js
index 0a5a2c8..a4d0652 100644
--- a/src/physics/worker.js
+++ b/src/physics/worker.js
@@ -70,7 +70,7 @@ var PhysicsWorker = function(){
       if (_physicsInterval===null) return
       clearInterval(_physicsInterval);
       _physicsInterval = null;
-      // postMessage('stopping')
+      postMessage({type:'stopping'})
     },
     tick:function(){
       // iterate the system