OpenSpace/include/openspace/scene/scale.h

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2018                                                               *
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#ifndef __OPENSPACE_CORE___SCALE___H__
#define __OPENSPACE_CORE___SCALE___H__

#include <openspace/properties/propertyowner.h>

#include <ghoul/glm.h>
#include <memory>

namespace ghoul { class Dictionary; }

namespace openspace {

struct UpdateData;

namespace documentation { struct Documentation; }

class Scale : public properties::PropertyOwner {
public:
    static std::unique_ptr<Scale> createFromDictionary(
        const ghoul::Dictionary& dictionary);

    Scale();
    virtual ~Scale() = default;

    virtual bool initialize();

    double scaleValue() const;
    virtual double scaleValue(const UpdateData& data) const = 0;
    virtual void update(const UpdateData& data);

    static documentation::Documentation Documentation();

protected:
    void requireUpdate();

private:
    bool _needsUpdate = true;
    double _cachedTime = -std::numeric_limits<double>::max();
    double _cachedScale = 1.0;
};

}  // namespace openspace

#endif // __OPENSPACE_CORE___SCALE___H__