particles.hpp

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/* Copyright (c) 2023 Otto Link. Distributed under the terms of the GNU General
   Public License. The full license is in the file LICENSE, distributed with
   this software. */
 
#pragma once
 
#include "highmap/algebra.hpp"
#include "highmap/array.hpp"
 
#define HMAP_PARTICLES_GRADIENT_MIN 0.0001f
#define HMAP_PARTICLES_VELOCITY_MIN 0.001f
 
namespace hmap
{
 
struct Pos
{
  float x;
  float y;
  int   i;
  int   j;
  float u;
  float v;
};
 
struct Particle
{
  // parameters
  float c_capacity;
  float c_erosion;
  float c_deposition;
  float c_inertia;
  float drag_rate;
 
  // features
  float sediment = 0.f;
  float volume = 0.f; // water
 
  // dynamic
  Pos         pos;
  Vec2<float> vel;
  float       vnorm;
  bool        vlim = 1.f;
  bool        is_active = true;
 
  // constructor
  Particle(float c_capacity,
           float c_erosion,
           float c_deposition,
           float c_inertia,
           float drag_rate);
 
  // methods
  void move(const Array &h, float dt);
 
  void set_xy(float x, float y);
};
 
} // namespace hmap