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gui/animation/ScaleAnimation.h

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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.
+ *
+ * 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/>.
+ *
+ */
+
+// Based on code by omergilad.
+
+#ifndef GUI_ANIMATION_SCALEANIMATION_H
+#define GUI_ANIMATION_SCALEANIMATION_H
+
+#include "gui/animation/Animation.h"
+
+namespace GUI {
+
+class ScaleAnimation: public Animation {
+public:
+	ScaleAnimation() : _endWidth(0), _endWidthFactor(0) {}
+
+	virtual ~ScaleAnimation() {}
+
+	float getEndWidth() const { return _endWidth; }
+	void setEndWidth(float endWidth) { _endWidth = endWidth; }
+	float getEndWidthFactor() const { return _endWidthFactor; }
+	void setEndWidthFactor(float endWidthFactor) { _endWidthFactor = endWidthFactor; }
+	float getStartWidth() const { return _startWidth; }
+	void setStartWidth(float startWidth) { _startWidth = startWidth; }
+
+	void updateInternal(Drawable *drawable, float interpolation) {
+		// If start width was set as 0 -> use the current width as the start dimension
+		if (_startWidth == 0)
+			_startWidth = drawable->getWidth();
+
+		// If end width was set as 0 - multiply the start width by the given factor
+		if (_endWidth == 0)
+			_endWidth = _startWidth * _endWidthFactor;
+
+		// Calculate width based on interpolation
+		float width = _startWidth * (1 - interpolation) + _endWidth * interpolation;
+		drawable->setWidth(width);
+	}
+
+private:
+	virtual void updateInternal(Drawable *drawable, float interpolation);
+	float _startWidth;
+	float _endWidth;
+	float _endWidthFactor;
+};
+
+} // End of namespace GUI
+
+
+#endif /* GUI_ANIMATION_SCALEANIMATION_H */