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53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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, see <http://www.gnu.org/licenses/>.
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*
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*/
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// Based on code by omergilad.
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#ifndef GUI_ANIMATION_ALPHA_ANIMATION_H
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#define GUI_ANIMATION_ALPHA_ANIMATION_H
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#include "gui/animation/Animation.h"
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namespace GUI {
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class AlphaAnimation: public Animation {
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public:
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AlphaAnimation() {}
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virtual ~AlphaAnimation() {}
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float getEndAlpha() const { return _endAlpha; }
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void setEndAlpha(float endAlpha) { _endAlpha = endAlpha; }
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float getStartAlpha() const { return _startAlpha; }
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void setStartAlpha(float startAlpha) { _startAlpha = startAlpha; }
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protected:
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virtual void updateInternal(Drawable* drawable, float interpolation) {
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// Calculate alpha value based on properties and interpolation
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drawable->setAlpha(_startAlpha * (1 - interpolation) + _endAlpha * interpolation);
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}
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float _startAlpha;
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float _endAlpha;
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};
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} // End of namespace GUI
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#endif /* GUI_ANIMATION_ALPHA_ANIMATION_H */
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