func (nm *networkManager) Give(ctx *context.T, call rpc.ServerCall, t spec.Triangle) error {
if ctx.V(3) {
blessings, rejected := security.RemoteBlessingNames(ctx, call.Security())
ctx.Infof("Took a triangle from %v@%v (rejected blessings: %v)", blessings, call.RemoteEndpoint().Name(), rejected)
}
// Transform from sender's coordinates to our coordinates.
// The assumption is that if the triangle was to the left of the
// sender's coordinate system, then it will appear on our right and
// vice-versa.
switch {
case t.X < -1:
t.X += 2
case t.X > 1:
t.X -= 2
}
nm.myScreen <- &t
return nil
}
func moveTriangle(t *spec.Triangle) {
t.Dy = t.Dy - gravity
t.X = t.X + t.Dx*timeBetweenPaints
t.Y = t.Y + t.Dy*timeBetweenPaints
if t.Y <= -1 {
t.Dy = -1 * t.Dy
t.Y = -1
} else if maxY := 1 - triangleCenterHeight; t.Y >= maxY {
t.Dy = -1 * t.Dy
t.Y = maxY
}
}
func returnTriangle(t *spec.Triangle, myScreen chan<- *spec.Triangle) {
t.Dx = -1 * t.Dx
moveTriangle(t)
myScreen <- t
}