115 lines
4.4 KiB
C++
115 lines
4.4 KiB
C++
/*****************************************************************************
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Header: BalloonSim.h
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Author: Christian Mayer
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Date started: 01.09.99
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-------- Copyright (C) 1999 Christian Mayer (fgfs@christianmayer.de) --------
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Further information about the GNU General Public License can also be found on
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the world wide web at http://www.gnu.org.
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FUNCTIONAL DESCRIPTION
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------------------------------------------------------------------------------
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Header for the hot air balloon simulator
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HISTORY
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------------------------------------------------------------------------------
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01.09.1999 Christian Mayer Created
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03.10.1999 Christian Mayer cleaned the code by moveing WeatherDatabase
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calls inside the update()
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*****************************************************************************/
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/****************************************************************************/
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/* SENTRY */
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/****************************************************************************/
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#ifndef BalloonSim_H
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#define BalloonSim_H
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/****************************************************************************/
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/* INCLUDES */
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/****************************************************************************/
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#include <simgear/math/SGMath.hxx>
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/****************************************************************************/
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/* DEFINES */
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/****************************************************************************/
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/****************************************************************************/
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/* CLASS DECLARATION */
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/****************************************************************************/
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class balloon
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{
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private:
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float dt; //in s
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SGVec3f gravity_vector; //in m/s*s
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SGVec3f hpr; //the balloon isn't allways exactly vertical (e.g. during gusts); normalized
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SGVec3f velocity; //current velocity; it gets iterated at each 'update'
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SGVec3f position; //current position in lat/lon/alt
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float balloon_envelope_area; //area of the envelope
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float balloon_envelope_volume; //volume of the envelope
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float wind_facing_area_of_balloon;
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float wind_facing_area_of_basket;
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float cw_envelope; //wind resistance of the envelope
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float cw_basket; //wind resistance of the bakset
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//all weights in kg
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float weight_of_total_fuel;
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float weight_of_envelope;
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float weight_of_basket; //weight of all the unmovable stuff such as the basket, the burner and the empty tanks
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float weight_of_cargo; //passengers and anything left (e.g. sand bags that are thrown away to give additional lift)
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float fuel_left; //as a percentage
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float max_flow_of_fuel_per_second; //in percent per second
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float current_burner_strength;
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float lambda; //waermeuebergangskoeffizient (heat transmission coefficent?!?) for the envelope
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float l_of_the_envelope; //the thickness of the envelope (in m)
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float T; //tempereature inside the balloon
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float ground_level;
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public:
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balloon(); //constructor for initializing the balloon
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void update(); //dt = time in seconds since last call
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void set_burner_strength(const float bs);
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void getVelocity(SGVec3f& v) const;
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void setVelocity(const SGVec3f& v);
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void getPosition(SGVec3f& v) const;
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void setPosition(const SGVec3f& v);
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void getHPR(SGVec3f& angles) const; //the balloon isn't allways exactly vertical
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void setHPR(const SGVec3f& angles); //the balloon isn't allways exactly vertical
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void setGroundLevel(const float altitude);
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float getTemperature(void) const;
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float getFuelLeft(void) const;
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void set_dt(const float new_dt) { dt = new_dt; }
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};
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/****************************************************************************/
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#endif /*BalloonSim_H*/
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