func (m *Mob) moveTowardExit(elapsed time.Duration, level *Level) {
var (
dest mgl32.Vec2
ok bool
pct = float32(elapsed) / float32(time.Second)
gridDist mgl32.Vec2
goalDist int32
stepDist = pct * m.Speed
)
if dest, goalDist, ok = level.Grid.GetNextStepToSink(m.Pos); !ok {
return
}
gridDist = dest.Sub(m.Pos)
if goalDist == 1 && gridDist.Len() < stepDist+0.5 {
m.PendingDisable = true
}
if gridDist.X() > 0 {
m.swapState(Left, Right)
} else {
m.swapState(Right, Left)
}
m.Pos = m.Pos.Add(gridDist.Normalize().Mul(stepDist))
}
func Vec2AngleBetween(v1, v2 mgl32.Vec2) float32 {
return float32(math.Acos(float64(v1.Normalize().Dot(v2.Normalize()))))
}