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engines/pegasus/neighborhood/mars/planetmover.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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 = nullptr;
+}
+
+void PlanetMover::startMoving(Movie *planetMovie) {
+	_planetMovie = planetMovie;
+	_p4 = kPlanetStartTop;
+	_r4 = g_vm->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 + g_vm->getRandomNumber(kPlanetStartTop - kPlanetStopTop - 1);
+	_r4 = g_vm->getRandomNumber(kMaxVelocity - 1);
+
+	if (_r4 + _p4 < kPlanetStopTop)
+		_r4 = kPlanetStopTop - _p4;
+
+	stop();
+	_duration = kRovingTime + g_vm->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