Grid2D.h

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#pragma once
 
#include <iostream>
#include <string>
#include <vector>
 
#include "Vec2.h"
#include "Vec3.h"
#include "Image.h"
#include "GLTexture2D.h"

class Grid2D {
public:
  Grid2D(size_t width, size_t height);

  Grid2D(size_t width, size_t height, const std::vector<float> data);

  Grid2D(const Grid2D& other);

  Grid2D(const Image& image);

  Grid2D(std::istream &is);

  void save(std::ostream &os) const;


  size_t getWidth() const;
  size_t getHeight() const;

  std::string toString() const;

  std::vector<uint8_t> toByteArray() const;

  Grid2D toSignedDistance(float threshold) const;

  GLTexture2D toTexture() const;

  void setValue(size_t x, size_t y, float value);

  float getValueNormalized(float x, float y) const;

  float getValue(size_t x, size_t y) const;

  float sample(float x, float y) const ;

  float sample(const Vec2& pos) const ;

  Vec3 normal(float x, float y) const;

  Vec3 normal(const Vec2& pos) const;

  static Grid2D genRandom(size_t x, size_t y, uint32_t seed);

  static Grid2D genRandom(size_t x, size_t y);
 
  // ===== Scalar arithmetic =====
  Grid2D operator*(const float& value) const;
  Grid2D operator/(const float& value) const;
  Grid2D operator+(const float& value) const;
  Grid2D operator-(const float& value) const;
 
  // ===== Grid‑wise arithmetic (size reconciliation by resampling) =====
  Grid2D operator+(const Grid2D& other) const;
  Grid2D operator/(const Grid2D& other) const;
  Grid2D operator*(const Grid2D& other) const;
  Grid2D operator-(const Grid2D& other) const;

  void normalize(const float maxVal = 1);

  Vec2t<size_t> maxValue() const;

  Vec2t<size_t> minValue() const;

  void fill(float value);

  friend std::ostream& operator<<(std::ostream &os, const Grid2D& v);

  static Grid2D fromBMP(const std::string& filename);
 
private:
  size_t width;               
  size_t height;              
  std::vector<float> data{};  

  size_t index(size_t x, size_t y) const;

  std::pair<size_t,size_t> findMaxSize(const Grid2D& other) const;
};