snd_MoveValue.h

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#ifndef NW_SND_MOVE_VALUE_H_
#define NW_SND_MOVE_VALUE_H_
 
namespace nw { namespace snd { namespace internal {
 
template <typename ValueType, typename CountType>
class MoveValue
{
public:
    MoveValue()
        : m_Origin(0)
        , m_Target(0)
        , m_Frame(0)
        , m_Counter(0)
    {
    }
 
    void InitValue(ValueType value)
    {
        m_Origin  = value;
        m_Target  = value;
        m_Frame   = 0;
        m_Counter = 0;
    }
 
    void SetTarget(ValueType targetValue, CountType frames)
    {
        m_Origin  = GetValue();
        m_Target  = targetValue;
        m_Frame   = frames;
        m_Counter = 0;
    }
 
    ValueType GetTarget() const
    {
        return m_Target;
    }
 
    ValueType GetValue() const
    {
        if (IsFinished())
            return m_Target;
 
        return static_cast<ValueType>(
            m_Origin + (m_Target - m_Origin) * ValueType(m_Counter) / ValueType(m_Frame)
        );
    }
 
    void Update()
    {
        if (m_Counter < m_Frame)
            ++m_Counter;
    }
 
    bool IsFinished() const
    {
        return m_Counter >= m_Frame;
    }
 
    CountType GetRemainingCount() const
    {
        if (IsFinished())
            return static_cast<CountType>(0);
 
        return m_Frame - m_Counter;
    }
 
private:
    ValueType m_Origin;
    ValueType m_Target;
    CountType m_Frame;
    CountType m_Counter;
};
 
} } } // namespace nw::snd::internal
 
#endif // NW_SND_MOVE_VALUE_H_