From 07c373d60a9f2d262617dbfdf719499687aeea73 Mon Sep 17 00:00:00 2001 From: terkhen Date: Sat, 6 Mar 2010 12:44:30 +0000 Subject: (svn r19339) -Codechange: Move acceleration functions to GroundVehicle. --- src/ground_vehicle.cpp | 150 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 150 insertions(+) create mode 100644 src/ground_vehicle.cpp (limited to 'src/ground_vehicle.cpp') diff --git a/src/ground_vehicle.cpp b/src/ground_vehicle.cpp new file mode 100644 index 000000000..1ab6da9da --- /dev/null +++ b/src/ground_vehicle.cpp @@ -0,0 +1,150 @@ +/* $Id$ */ + +/* + * This file is part of OpenTTD. + * 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. + * 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. + * 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 . + */ + +/** @file ground_vehicle.cpp Implementation of GroundVehicle. */ + +#include "stdafx.h" +#include "train.h" +#include "ground_vehicle.hpp" +#include "window_type.h" +#include "vehicle_gui.h" +#include "window_func.h" + +/** + * Recalculates the cached total power of a vehicle. Should be called when the consist is changed. + */ +template +void GroundVehicle::PowerChanged() +{ + assert(this->First() == this); + const T *v = T::From(this); + + uint32 total_power = 0; + uint32 max_te = 0; + uint32 number_of_parts = 0; + uint16 max_track_speed = v->GetInitialMaxSpeed(); + + for (const T *u = v; u != NULL; u = u->Next()) { + uint32 current_power = u->GetPower(); + total_power += current_power; + + /* Only powered parts add tractive effort. */ + if (current_power > 0) max_te += u->GetWeight() * u->GetTractiveEffort(); + total_power += u->GetPoweredPartPower(v); + number_of_parts++; + + /* Get minimum max speed for this track. */ + uint16 track_speed = u->GetMaxTrackSpeed(); + if (track_speed > 0) max_track_speed = min(max_track_speed, track_speed); + } + + this->acc_cache.cached_axle_resistance = 60 * number_of_parts; + this->acc_cache.cached_air_drag = 20 + 3 * number_of_parts; + + max_te *= 10000; // Tractive effort in (tonnes * 1000 * 10 =) N. + max_te /= 256; // Tractive effort is a [0-255] coefficient. + if (this->acc_cache.cached_power != total_power || this->acc_cache.cached_max_te != max_te) { + /* Stop the vehicle if it has no power. */ + if (total_power == 0) this->vehstatus |= VS_STOPPED; + + this->acc_cache.cached_power = total_power; + this->acc_cache.cached_max_te = max_te; + SetWindowDirty(WC_VEHICLE_DETAILS, this->index); + SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, VVW_WIDGET_START_STOP_VEH); + } + + this->acc_cache.cached_max_track_speed = max_track_speed; +} + +/** + * Recalculates the cached weight of a vehicle and its parts. Should be called each time the cargo on + * the consist changes. + */ +template +void GroundVehicle::CargoChanged() +{ + assert(this->First() == this); + uint32 weight = 0; + + for (T *u = T::From(this); u != NULL; u = u->Next()) { + uint32 current_weight = u->GetWeight(); + weight += current_weight; + u->acc_cache.cached_slope_resistance = current_weight * u->GetSlopeSteepness(); + } + + /* Store consist weight in cache. */ + this->acc_cache.cached_weight = weight; + + /* Now update vehicle power (tractive effort is dependent on weight). */ + this->PowerChanged(); +} + +/** + * Calculates the acceleration of the vehicle under its current conditions. + * @return Current acceleration of the vehicle. + */ +template +int GroundVehicle::GetAcceleration() const +{ + /* Templated class used for function calls for performance reasons. */ + const T *v = T::From(this); + int32 speed = v->GetCurrentSpeed(); + + /* Weight is stored in tonnes. */ + int32 mass = this->acc_cache.cached_weight; + + /* Power is stored in HP, we need it in watts. */ + int32 power = this->acc_cache.cached_power * 746; + + int32 resistance = 0; + + bool maglev = v->GetAccelerationType() == 2; + + const int area = 120; + if (!maglev) { + resistance = (13 * mass) / 10; + resistance += this->acc_cache.cached_axle_resistance; + resistance += (v->GetRollingFriction() * mass * speed) / 1000; + resistance += (area * this->acc_cache.cached_air_drag * speed * speed) / 10000; + } else { + resistance += (area * this->acc_cache.cached_air_drag * speed * speed) / 20000; + } + + resistance += v->GetSlopeResistance(); + resistance *= 4; //[N] + + /* This value allows to know if the vehicle is accelerating or braking. */ + AccelStatus mode = v->GetAccelerationStatus(); + + const int max_te = this->acc_cache.cached_max_te; // [N] + int force; + if (speed > 0) { + if (!maglev) { + force = power / speed; //[N] + force *= 22; + force /= 10; + if (mode == AS_ACCEL && force > max_te) force = max_te; + } else { + force = power / 25; + } + } else { + /* "Kickoff" acceleration. */ + force = (mode == AS_ACCEL && !maglev) ? min(max_te, power) : power; + force = max(force, (mass * 8) + resistance); + } + + if (mode == AS_ACCEL) { + return (force - resistance) / (mass * 2); + } else { + return min(-force - resistance, -10000) / mass; + } +} + +/* Instantiation for Train */ +template struct GroundVehicle; -- cgit v1.2.3-54-g00ecf