ScaleAnimation.h

/* 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 */