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package sims.test.gui
package scenes
import sims.dynamics._
import sims.math._
import sims.dynamics._
object LongCollisionScene extends Scene {
override def description = "A test to verify conservation in a collision."
def makeBodies() = (for (i <- 0 until 10) yield {
new Circle(0.2) {
position = Vector2D(0 + 2.01 * radius * i, 0)
restitution = 0.8
}
}.asBody) ++ (for (i <- 0 until 10) yield {
new Circle(0.2) {
position = Vector2D(6 + 2.01 * radius * i, 0)
restitution = 0.8
}
}.asBody)
override def init() = {
val bodies = makeBodies()
bodies(0).fixed = true
bodies(19).fixed = true
for (b <- bodies) world += b
world.gravity = Vector2D.Null
val bullet = new Body(new Circle(0.2) {
position = Vector2D(5, 0)
restitution = 0.8}) {
linearVelocity = Vector2D(3, 0)
}
world += bullet
world.iterations = 10
registerListeners()
}
def registerListeners() = {
reactions += {
case Stepped(`world`) => println(
"P: " + world.bodies.map(P(_)).sum.toFloat +
"\tE: " + world.bodies.map(E(_)).sum.toFloat
)
}
}
def P(b: Body) = if (b.fixed) 0 else b.linearMomentum.length
def E(b: Body) = if (b.fixed) 0 else (b.linearVelocity dot b.linearVelocity) * b.mass * 0.5
}
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