graph_scale.hpp

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#pragma once

 
#include <cstddef>
#include <span>
#include <vector>
 
namespace pulp::view {

struct LogFrequencyScale {
    float min_hz = 20.0f;
    float max_hz = 20000.0f;
    float x = 0.0f;      
    float width = 0.0f;  

    float to_x(float hz) const;

    float to_frequency(float px) const;

    float frequency_at(std::size_t index, std::size_t count) const;

    std::vector<float> ticks() const;

    static bool is_major_tick(float hz);
};

struct DecibelScale {
    float min_db = -24.0f;
    float max_db = 24.0f;
    float y = 0.0f;       
    float height = 0.0f;  
 
    float to_y(float db) const;
    float to_decibels(float py) const;

    std::vector<float> ticks(float step_db) const;
};

void resample_spectrum_log(std::span<const float> bins_db,
                           float sample_rate,
                           const LogFrequencyScale& scale,
                           std::span<float> out);
 
} // namespace pulp::view