Function ShipAccelerate

src/ship_cmd.cpp:414–432

* Accelerates the ship towards its target speed. * @param v Ship to accelerate. * @return Number of steps to move the ship. */

 * @return Number of steps to move the ship.
 */
static uint ShipAccelerate(Vehicle *v)
{
	uint speed;
	speed = std::min<uint>(v->cur_speed + v->acceleration, v->vcache.cached_max_speed);
	speed = std::min<uint>(speed, v->current_order.GetMaxSpeed() * 2);

	/* updates statusbar only if speed have changed to save CPU time */
	if (speed != v->cur_speed) {
		v->cur_speed = speed;
		SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, WID_VV_START_STOP);
	}

	const uint advance_speed = v->GetAdvanceSpeed(speed);
	const uint number_of_steps = (advance_speed + v->progress) / v->GetAdvanceDistance();
	const uint remainder = (advance_speed + v->progress) % v->GetAdvanceDistance();
	assert(remainder <= std::numeric_limits<uint8_t>::max());
	v->progress = static_cast<uint8_t>(remainder);
	return number_of_steps;
}

/**
 * Ship arrives at a dock. If it is the first time, send out a news item.