zoom.h

/* Copyright (c) 2009-2017, Stefan Eilemann <eile@equalizergraphics.com>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *
 * This library 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef EQFABRIC_ZOOM_H
#define EQFABRIC_ZOOM_H

#include <eq/fabric/api.h>
#include <eq/fabric/types.h>
#include <eq/fabric/vmmlib.h>

namespace eq
{
namespace fabric
{
class Zoom : public Vector2f
{
public:
    Zoom()
        : Vector2f(1.f, 1.f)
    {
    }

    Zoom(const float x_, const float y_)
        : Vector2f(x_, y_)
    {
    }

    bool isValid() const { return (x() != 0.f && y() != 0.f); }
    void validate()
    {
        if (x() == 0.f)
            x() = 1.f;
        if (y() == 0.f)
            y() = 1.f;
    }

    void invalidate() { x() = y() = 0.f; }
    void apply(const Zoom& rhs)
    {
        x() *= rhs.x();
        y() *= rhs.y();
    }

    EQFABRIC_API static const Zoom NONE;
};

inline std::ostream& operator<<(std::ostream& os, const Zoom& zoom)
{
    if (zoom.isValid())
        os << "zoom     [ " << zoom.x() << ' ' << zoom.y() << " ]";
    return os;
}
}
}

#endif // EQFABRIC_ZOOM_H