170 lines
4.6 KiB
C++
170 lines
4.6 KiB
C++
// FGAIStorm - FGAIBase-derived class creates an AI thunderstorm or cloud
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//
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// Written by David Culp, started Feb 2004.
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//
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// Copyright (C) 2004 David P. Culp - davidculp2@comcast.net
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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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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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <Main/fg_props.hxx>
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#include <Main/globals.hxx>
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#include <Scenery/scenery.hxx>
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#include <string>
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#include <cmath>
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#include <cstdlib>
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#include <time.h>
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using std::string;
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#include "AIStorm.hxx"
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FGAIStorm::FGAIStorm() :
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FGAIBase(otStorm, false)
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{
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delay = 3.6;
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subflashes = 1;
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timer = 0.0;
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random_delay = 3.6;
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flash_node = fgGetNode("/environment/lightning/flash", true);
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flash_node->setBoolValue(false);
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flashed = 0;
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flashing = false;
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subflash_index = -1;
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subflash_array[0] = 1;
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subflash_array[1] = 2;
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subflash_array[2] = 1;
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subflash_array[3] = 3;
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subflash_array[4] = 2;
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subflash_array[5] = 1;
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subflash_array[6] = 1;
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subflash_array[7] = 2;
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turb_mag_node = fgGetNode("/environment/turbulence/magnitude-norm", true);
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turb_rate_node = fgGetNode("/environment/turbulence/rate-hz", true);
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}
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FGAIStorm::~FGAIStorm() {
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}
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void FGAIStorm::readFromScenario(SGPropertyNode* scFileNode) {
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if (!scFileNode)
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return;
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FGAIBase::readFromScenario(scFileNode);
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setDiameter(scFileNode->getDoubleValue("diameter-ft", 0.0)/6076.11549);
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setHeight(scFileNode->getDoubleValue("height-msl", 5000.0));
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setStrengthNorm(scFileNode->getDoubleValue("strength-norm", 1.0));
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}
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bool FGAIStorm::init(bool search_in_AI_path) {
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return FGAIBase::init(search_in_AI_path);
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}
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void FGAIStorm::bind() {
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FGAIBase::bind();
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}
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void FGAIStorm::unbind() {
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FGAIBase::unbind();
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}
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void FGAIStorm::update(double dt) {
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FGAIBase::update(dt);
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Run(dt);
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Transform();
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}
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void FGAIStorm::Run(double dt) {
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double speed_north_deg_sec;
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double speed_east_deg_sec;
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// convert speed to degrees per second
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speed_north_deg_sec = cos( hdg / SG_RADIANS_TO_DEGREES )
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* speed * 1.686 / ft_per_deg_lat;
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speed_east_deg_sec = sin( hdg / SG_RADIANS_TO_DEGREES )
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* speed * 1.686 / ft_per_deg_lon;
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// set new position
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pos.setLatitudeDeg( pos.getLatitudeDeg() + speed_north_deg_sec * dt);
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pos.setLongitudeDeg( pos.getLongitudeDeg() + speed_east_deg_sec * dt);
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// do calculations for weather radar display
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UpdateRadar(manager);
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// **************************************************
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// * do lightning *
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// **************************************************
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if (timer > random_delay) {
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srand((unsigned)time(0));
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random_delay = delay + (rand()%3) - 1.0;
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//cout << "random_delay = " << random_delay << endl;
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timer = 0.0;
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flashing = true;
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subflash_index++;
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if (subflash_index == 8) subflash_index = 0;
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subflashes = subflash_array[subflash_index];
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}
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if (flashing) {
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if (flashed < subflashes) {
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timer += dt;
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if (timer < 0.1) {
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flash_node->setBoolValue(true);
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} else {
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flash_node->setBoolValue(false);
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if (timer > 0.2) {
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timer = 0.0;
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flashed++;
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}
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}
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} else {
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flashing = false;
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timer = 0.0;
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flashed = 0;
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}
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}
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else {
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timer += dt;
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}
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// ***************************************************
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// * do turbulence *
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// ***************************************************
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// copy user's position from the AIManager
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double d = dist(SGVec3d::fromGeod(pos), globals->get_aircraft_position_cart());
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double rangeNm = d * SG_METER_TO_NM;
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double user_altitude = globals->get_aircraft_position().getElevationFt();
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if (rangeNm < (diameter * 0.5) &&
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user_altitude > (altitude_ft - 1000.0) &&
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user_altitude < height) {
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turb_mag_node->setDoubleValue(strength_norm);
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turb_rate_node->setDoubleValue(0.5);
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}
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}
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