GUI: Added animation classes

gui/animation/Animation.cpp

@@ -0,0 +1,98 @@
+/* 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.
+ *
+ * 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.
+ *
+ */
+
+// Based on code by omergilad.
+
+#include "gui/animation/Animation.h"
+
+namespace GUI {
+
+Animation::Animation()
+		: _startTime(0), _duration(0), _finished(false), _finishOnEnd(true) {
+}
+
+Animation::~Animation() {
+}
+
+void Animation::start(long currentTime) {
+	_finished = false;
+	_startTime = currentTime;
+}
+
+void Animation::setDuration(long duration) {
+	_duration = duration;
+}
+
+void Animation::update(Drawable *drawable, long currentTime) {
+	float interpolation;
+
+	if (currentTime < _startTime) {
+		// If the start time is in the future, nothing changes - the interpolated value is 0
+		interpolation = 0;
+	} else if (currentTime > _startTime + _duration) {
+		// If the animation is finished, the interpolated value is 1 and the animation is marked as finished
+		interpolation = 1;
+		finishAnimation();
+	} else {
+		// Calculate the interpolated value
+		interpolation = (currentTime - _startTime) / (float) (_duration);
+	}
+
+	// Activate the interpolator if present
+	if (_interpolator.get() != NULL) {
+		interpolation = _interpolator->interpolate(interpolation);
+	}
+
+	updateInternal(drawable, interpolation);
+}
+
+void Animation::finishAnimation() {
+	if (_finishOnEnd) {
+		_finished = true;
+	}
+}
+
+void Animation::updateInternal(Drawable *drawable, float interpolation) {
+	// Default implementation
+}
+
+bool Animation::isFinished() const {
+	return _finished;
+}
+
+bool Animation::isFinishOnEnd() const {
+	return _finishOnEnd;
+}
+
+void Animation::setFinishOnEnd(bool finishOnEnd) {
+	_finishOnEnd = finishOnEnd;
+}
+
+InterpolatorPtr Animation::getInterpolator() const {
+	return _interpolator;
+}
+
+void Animation::setInterpolator(InterpolatorPtr interpolator) {
+	_interpolator = interpolator;
+}
+
+} // End of namespace GUI