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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* Additional copyright for this file:
* Copyright (C) 1995-1997 Presto Studios, Inc.
*
* This program 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; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "pegasus/movie.h"
#include "pegasus/pegasus.h"
#include "pegasus/neighborhood/mars/constants.h"
#include "pegasus/neighborhood/mars/hermite.h"
#include "pegasus/neighborhood/mars/planetmover.h"
#include "pegasus/neighborhood/mars/shuttleenergymeter.h"
namespace Pegasus {
static const TimeScale kRovingScale = kTractorBeamScale;
static const TimeValue kRovingTime = kTenSeconds * kRovingScale;
static const TimeValue kRovingSlop = kTwoSeconds * kRovingScale;
static const CoordType kMaxVelocity = 20;
PlanetMover::PlanetMover() {
setScale(kRovingScale);
_dropping = false;
_planetMovie = 0;
}
void PlanetMover::startMoving(Movie *planetMovie) {
_planetMovie = planetMovie;
_p4 = kPlanetStartTop;
_r4 = ((PegasusEngine *)g_engine)->getRandomNumber(kMaxVelocity - 1);
if (_r4 + _p4 < kPlanetStopTop)
_r4 = kPlanetStopTop - _p4;
newDestination();
}
void PlanetMover::stopMoving() {
stop();
}
void PlanetMover::dropPlanetOutOfSight() {
stop();
CoordType currentLoc = hermite(_p1, _p4, _r1, _r4, _lastTime, _duration);
CoordType currentV = dHermite(_p1, _p4, _r1, _r4, _lastTime, _duration);
_p1 = currentLoc;
_r1 = currentV;
_p4 = kPlanetStartTop;
_r4 = 0;
_duration = kTractorBeamTime - kTractorBeamScale;
_dropping = true;
setSegment(0, _duration);
setTime(0);
start();
}
void PlanetMover::newDestination() {
_p1 = _p4;
_r1 = _r4;
_p4 = kPlanetStopTop + ((PegasusEngine *)g_engine)->getRandomNumber(kPlanetStartTop - kPlanetStopTop - 1);
_r4 = ((PegasusEngine *)g_engine)->getRandomNumber(kMaxVelocity - 1);
if (_r4 + _p4 < kPlanetStopTop)
_r4 = kPlanetStopTop - _p4;
stop();
_duration = kRovingTime + ((PegasusEngine *)g_engine)->getRandomNumber(kRovingSlop - 1);
setSegment(0, _duration);
setTime(0);
start();
}
void PlanetMover::timeChanged(const TimeValue) {
if (_planetMovie) {
_planetMovie->moveElementTo(kPlanetStartLeft, hermite(_p1, _p4, _r1, _r4, _lastTime, _duration));
if (_lastTime == _duration) {
if (_dropping)
stop();
else
newDestination();
}
}
}
} // End of namespace Pegasus
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