1 files changed, 72 insertions, 0 deletions
diff --git a/src/graphyx/actors/PhysicsActor.scala b/src/graphyx/actors/PhysicsActor.scala
new file mode 100644
index 0000000..b93541f
--- /dev/null
+++ b/src/graphyx/actors/PhysicsActor.scala
@@ -0,0 +1,72 @@
+/*
+ * Graphyx
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package graphyx.actors
+
+import graphyx.graphics._
+import sims.dynamics._
+import scala.actors._
+class PhysicsActor extends Actor{
+  var world = new World
+  
+  var continue = true
+  var simulate = false
+  
+  private var _fps = 0
+  def fps = _fps
+  
+  def act{
+    println("Physics actor started.")
+    while (continue) {
+      
+      var t0 = System.nanoTime
+      
+      if (simulate) {
+        world.step()
+      }
+      
+      Graphyx.guiActor ! new Scene(world) {override val fps = _fps}
+      
+      while (mailboxSize > 0) {
+        receive {
+          case Stop => {
+            simulate = false
+            println("Simulation stopped.")
+          }
+          case Start => {
+            simulate = true
+            println("Simulation started.")
+          }
+          case Exit => {
+            continue = false
+          }
+          case sw @ SetWorld(w: World) => world = w
+          
+          case FireEvent => Graphyx.test.fireEvent()
+          
+          case other => println("Engine received unknown command: '" + other + "'")
+     	}
+      }
+      
+      val h = (System.nanoTime - t0) / 1000000
+      val f = 60
+      val T = (1.0/f) * 1000
+      if (T-h > 0)
+        Thread.sleep((T-h).toLong)
+      _fps = (1.0/((System.nanoTime - t0) / 1000000000.0)).toInt
+     //println((1.0/((System.nanoTime - t0) / 1000000000.0)).toInt)
+    }
+    println("Physics actor exited.")
+  }
+}
+
+case object Start
+case object Stop
+case object Exit
+case class SetWorld(world: World)
+case object FireEvent
+
+