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AlphaAnimation.h

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 // Based on code by omergilad.
00024 
00025 #ifndef GUI_ANIMATION_ANIMATION_H
00026 #define GUI_ANIMATION_ANIMATION_H
00027 
00028 #include "gui/animation/Animation.h"
00029 
00030 namespace GUI {
00031 
00032 class AlphaAnimation: public Animation {
00033 public:
00034     AlphaAnimation() {}
00035     virtual ~AlphaAnimation() {}
00036     float getEndAlpha() const { return _endAlpha; }
00037     void setEndAlpha(float endAlpha) { _endAlpha = endAlpha; }
00038     float getStartAlpha() const { return _startAlpha; }
00039     void setStartAlpha(float startAlpha) { _startAlpha = startAlpha; }
00040 
00041 protected:
00042     virtual void updateInternal(Drawable* drawable, float interpolation) {
00043         // Calculate alpha value based on properties and interpolation
00044         drawable->setAlpha(_startAlpha * (1 - interpolation) + _endAlpha * interpolation);
00045     }
00046 
00047     float _startAlpha;
00048     float _endAlpha;
00049 };
00050 
00051 } // End of namespace GUI
00052 
00053 #endif /* GUI_ANIMATION_ANIMATION_H */


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