pocketmine\entity\Entity::updateMovement PHP Method

    protected function updateMovement()
    {
        $diffPosition = ($this->x - $this->lastX) ** 2 + ($this->y - $this->lastY) ** 2 + ($this->z - $this->lastZ) ** 2;
        $diffRotation = ($this->yaw - $this->lastYaw) ** 2 + ($this->pitch - $this->lastPitch) ** 2;
        $diffMotion = ($this->motionX - $this->lastMotionX) ** 2 + ($this->motionY - $this->lastMotionY) ** 2 + ($this->motionZ - $this->lastMotionZ) ** 2;
        if ($diffPosition > 0.04 or $diffRotation > 2.25 and ($diffMotion > 0.0001 and $this->getMotion()->lengthSquared() <= 1.0E-5)) {
            //0.2 ** 2, 1.5 ** 2
            $this->lastX = $this->x;
            $this->lastY = $this->y;
            $this->lastZ = $this->z;
            $this->lastYaw = $this->yaw;
            $this->lastPitch = $this->pitch;
            $this->addMovement($this->x, $this->y + $this->getEyeHeight(), $this->z, $this->yaw, $this->pitch, $this->yaw);
        }
        if ($diffMotion > 0.0025 or $diffMotion > 0.0001 and $this->getMotion()->lengthSquared() <= 0.0001) {
            //0.05 ** 2
            $this->lastMotionX = $this->motionX;
            $this->lastMotionY = $this->motionY;
            $this->lastMotionZ = $this->motionZ;
            $this->level->addEntityMotion($this->chunk->getX(), $this->chunk->getZ(), $this->id, $this->motionX, $this->motionY, $this->motionZ);
        }
    }