(svn r19339) -Codechange: Move acceleration functions to GroundVehicle.
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/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file ground_vehicle.cpp Implementation of GroundVehicle. */
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#include "stdafx.h"
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#include "train.h"
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#include "ground_vehicle.hpp"
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#include "window_type.h"
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#include "vehicle_gui.h"
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#include "window_func.h"
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/**
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* Recalculates the cached total power of a vehicle. Should be called when the consist is changed.
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*/
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template <class T, VehicleType Type>
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void GroundVehicle<T, Type>::PowerChanged()
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{
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assert(this->First() == this);
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const T *v = T::From(this);
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uint32 total_power = 0;
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uint32 max_te = 0;
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uint32 number_of_parts = 0;
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uint16 max_track_speed = v->GetInitialMaxSpeed();
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for (const T *u = v; u != NULL; u = u->Next()) {
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uint32 current_power = u->GetPower();
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total_power += current_power;
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/* Only powered parts add tractive effort. */
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if (current_power > 0) max_te += u->GetWeight() * u->GetTractiveEffort();
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total_power += u->GetPoweredPartPower(v);
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number_of_parts++;
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/* Get minimum max speed for this track. */
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uint16 track_speed = u->GetMaxTrackSpeed();
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if (track_speed > 0) max_track_speed = min(max_track_speed, track_speed);
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}
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this->acc_cache.cached_axle_resistance = 60 * number_of_parts;
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this->acc_cache.cached_air_drag = 20 + 3 * number_of_parts;
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max_te *= 10000; // Tractive effort in (tonnes * 1000 * 10 =) N.
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max_te /= 256; // Tractive effort is a [0-255] coefficient.
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if (this->acc_cache.cached_power != total_power || this->acc_cache.cached_max_te != max_te) {
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/* Stop the vehicle if it has no power. */
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if (total_power == 0) this->vehstatus |= VS_STOPPED;
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this->acc_cache.cached_power = total_power;
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this->acc_cache.cached_max_te = max_te;
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SetWindowDirty(WC_VEHICLE_DETAILS, this->index);
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SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, VVW_WIDGET_START_STOP_VEH);
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}
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this->acc_cache.cached_max_track_speed = max_track_speed;
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}
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/**
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* Recalculates the cached weight of a vehicle and its parts. Should be called each time the cargo on
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* the consist changes.
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*/
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template <class T, VehicleType Type>
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void GroundVehicle<T, Type>::CargoChanged()
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{
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assert(this->First() == this);
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uint32 weight = 0;
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for (T *u = T::From(this); u != NULL; u = u->Next()) {
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uint32 current_weight = u->GetWeight();
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weight += current_weight;
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u->acc_cache.cached_slope_resistance = current_weight * u->GetSlopeSteepness();
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}
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/* Store consist weight in cache. */
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this->acc_cache.cached_weight = weight;
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/* Now update vehicle power (tractive effort is dependent on weight). */
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this->PowerChanged();
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}
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/**
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* Calculates the acceleration of the vehicle under its current conditions.
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* @return Current acceleration of the vehicle.
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*/
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template <class T, VehicleType Type>
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int GroundVehicle<T, Type>::GetAcceleration() const
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{
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/* Templated class used for function calls for performance reasons. */
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const T *v = T::From(this);
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int32 speed = v->GetCurrentSpeed();
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/* Weight is stored in tonnes. */
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int32 mass = this->acc_cache.cached_weight;
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/* Power is stored in HP, we need it in watts. */
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int32 power = this->acc_cache.cached_power * 746;
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int32 resistance = 0;
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bool maglev = v->GetAccelerationType() == 2;
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const int area = 120;
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if (!maglev) {
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resistance = (13 * mass) / 10;
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resistance += this->acc_cache.cached_axle_resistance;
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resistance += (v->GetRollingFriction() * mass * speed) / 1000;
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resistance += (area * this->acc_cache.cached_air_drag * speed * speed) / 10000;
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} else {
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resistance += (area * this->acc_cache.cached_air_drag * speed * speed) / 20000;
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}
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resistance += v->GetSlopeResistance();
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resistance *= 4; //[N]
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/* This value allows to know if the vehicle is accelerating or braking. */
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AccelStatus mode = v->GetAccelerationStatus();
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const int max_te = this->acc_cache.cached_max_te; // [N]
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int force;
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if (speed > 0) {
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if (!maglev) {
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force = power / speed; //[N]
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force *= 22;
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force /= 10;
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if (mode == AS_ACCEL && force > max_te) force = max_te;
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} else {
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force = power / 25;
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}
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} else {
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/* "Kickoff" acceleration. */
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force = (mode == AS_ACCEL && !maglev) ? min(max_te, power) : power;
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force = max(force, (mass * 8) + resistance);
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}
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if (mode == AS_ACCEL) {
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return (force - resistance) / (mass * 2);
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} else {
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return min(-force - resistance, -10000) / mass;
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}
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}
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/* Instantiation for Train */
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template struct GroundVehicle<Train, VEH_TRAIN>;
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