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/*
* 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
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