// Find the ball closest to the impulse and within a reasonable
// range, apply new velocity to the ball.
func (gn *Engine) applyImpulse(impulse *model.Ball) {
if gn.chatty {
log.Printf("Got impulse: %s", impulse.String())
}
closest, ball := gn.closestDsq(impulse.GetPos())
if ball == nil {
if gn.chatty {
log.Printf("No ball to punch.")
}
return
}
if gn.chatty {
log.Printf("DSQ to ball: %f.1\n", closest)
}
if closest <= gn.maxDistSqForImpulse {
if gn.chatty {
log.Printf("Punching ball.\n")
}
ball.SetVel(impulse.GetVel().X, impulse.GetVel().Y)
} else {
if gn.chatty {
log.Printf("Ball further than %f.1\n",
gn.maxDistSqForImpulse)
}
}
}
func (gn *Engine) throwOneBall(b *model.Ball, direction model.Direction) {
// Before throwing, normalize the Y coordinate to a dimensionless
// percentage. Recipient converts it based on their own dimensions,
// so that if the ball left one tenth of the way up the screen, it
// enters the next screen at the same relative position.
b.SetPos(b.GetPos().X, b.GetPos().Y/gn.scn.Height())
gn.chBallCommand <- model.BallCommand{b, direction}
}
func serializeBall(b *model.Ball) ifc.Ball {
wp := ifc.Player{int32(b.Owner().Id())}
return ifc.Ball{
wp, b.GetPos().X, b.GetPos().Y, b.GetVel().X, b.GetVel().Y}
}