ValueHistory.h

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#ifndef VALUEHISTORY_H
#define VALUEHISTORY_H
 
class ValueHistory
{
    static const int MAX_HISTORY = 256;
    float m_samples[MAX_HISTORY];
    int m_hsamples;
public:
    ValueHistory();
 
    inline void addSample(const float val)
    {
        m_hsamples = (m_hsamples+MAX_HISTORY-1) % MAX_HISTORY;
        m_samples[m_hsamples] = val;
    }
    
    inline int getSampleCount() const
    {
        return MAX_HISTORY;
    }
    
    inline float getSample(const int i) const
    {
        return m_samples[(m_hsamples+i) % MAX_HISTORY];
    }
    
    float getSampleMin() const;
    float getSampleMax() const;
    float getAverage() const;
};
 
struct GraphParams
{
    void setRect(int ix, int iy, int iw, int ih, int ipad);
    void setValueRange(float ivmin, float ivmax, int indiv, const char* iunits);
    
    int x, y, w, h, pad;
    float vmin, vmax;
    int ndiv;
    char units[16];
};
 
void drawGraphBackground(const GraphParams* p);
 
void drawGraph(const GraphParams* p, const ValueHistory* graph,
               int idx, const char* label, const unsigned int col);
 
 
#endif // VALUEHISTORY_H