ValueHistory.h

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#pragma once
 
#include <string>
#include <vector>
 
class ValueHistory
{
    static constexpr int MAX_HISTORY = 256;
    std::vector<float> samples{};
    int nextSampleIndex = 0;
 
public:
    ValueHistory() { samples.reserve(MAX_HISTORY); }
 
    void addSample(const float val)
    {
        if (samples.size() < MAX_HISTORY)
        {
            samples.push_back(val);
        }
        else
        {
            samples[nextSampleIndex] = val;
            nextSampleIndex = (nextSampleIndex + 1) % MAX_HISTORY;
        }
    }
 
    [[nodiscard]] int getSampleCount() const { return static_cast<int>(samples.size()); }
 
    [[nodiscard]] float getSample(const int i) const { return samples[(nextSampleIndex + i) % MAX_HISTORY]; }
 
    [[nodiscard]] float getSampleMin() const;
    [[nodiscard]] float getSampleMax() const;
    [[nodiscard]] float getAverage() const;
};
 
struct GraphParams
{
    void setRect(int ix, int iy, int iw, int ih, int ipad);
    void setValueRange(float minValue, float maxValue, int numDivisions, const std::string& units);
 
    int x;
    int y;
    int width;
    int height;
    int padding;
 
    float rangeMin;
    float rangeMax;
    int rangeDivisions;
 
    std::string units;
};
 
void drawGraphBackground(const GraphParams* p);
void drawGraph(const GraphParams* params, const ValueHistory* graph, int index, const char* label, const unsigned int color);