1 files changed, 88 insertions, 0 deletions
diff --git a/src/main/scala/graphyx/actors/PhysicsActor.scala b/src/main/scala/graphyx/actors/PhysicsActor.scala
new file mode 100644
index 0000000..7a7d2b9
--- /dev/null
+++ b/src/main/scala/graphyx/actors/PhysicsActor.scala
@@ -0,0 +1,88 @@
+/*
+ * Graphyx
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package graphyx.actors
+
+import akka.actor._
+import graphyx._
+import graphyx.graphics._
+import scala.concurrent.duration._
+import sims.dynamics._
+class PhysicsActor extends Actor{
+  import context._
+
+  var world = new World
+  
+  var simulate = false
+  
+  private var _fps = 0
+  def fps = _fps
+  var t0 = System.nanoTime
+
+  override def preStart() = {
+    println("Physics actor started.")
+    t0 = System.nanoTime
+  }
+
+  def receive = {
+    case Tick =>
+      t0 = System.nanoTime
+      if (simulate) {
+        world.step()
+      }
+      Graphyx.guiActor ! new Scene(world) {override val fps = _fps}
+      val h = (System.nanoTime - t0) / 1000000
+      val f = 60
+      val T = (1.0/f) * 1000
+      _fps = (1.0/((System.nanoTime - t0) / 1000000000.0)).toInt
+      //println((1.0/((System.nanoTime - t0) / 1000000000.0)).toInt)
+
+      val delay = if (T-h>0) (T-h).toLong else 0l
+
+      if (simulate) {
+        system.scheduler.scheduleOnce(delay.milliseconds, self, Tick)
+      }
+
+    case Step =>
+      world.step()
+      Graphyx.guiActor ! new Scene(world)
+
+    case Stop => {
+      simulate = false
+      println("Simulation stopped.")
+    }
+    case Start => {
+      simulate = true
+      self ! Tick
+      println("Simulation started.")
+    }
+  
+    case sw @ SetWorld(w: World) => world = w
+
+    case FireEvent => Graphyx.test.fireEvent()
+
+    case other => println("Engine received unknown command: '" + other + "'")
+  }
+
+  override def postStop() = {
+    println("Physics actor exited.")
+  }
+}
+
+object PhysicsActor {
+
+  def apply() = Props(classOf[PhysicsActor])
+
+}
+
+case object Tick
+case object Start
+case object Stop
+case object Step
+case class SetWorld(world: World)
+case object FireEvent
+
+