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#include <math.h>
#include "physics.hpp"
#include "raylib.h"
#include "raymath.h"
namespace Physics {
// using 1 as the const
//const float gravitational_constant = 6.67;//e-11;
//grav = grav_const × (r_mass / distance^2)
//force = s_mass * grav
//force = s_mass * (grav_const * (r_mass / distance^2))
Body::Body(Vector2 position, Vector2 velocity, float mass):position(position), velocity(velocity), mass(mass) {
}
Body ship = Body((Vector2){200,400}, (Vector2){0,0.5}, 1);
Body rock = Body((Vector2){400,400}, (Vector2){0,0}, 50);
//0.01667
void step(float deltaTime) {
// calculate velocity change
//pow((rock.position.x - ship.position.x),2) + pow((rock.position.y - ship.position.y),2);
float distance = Vector2DistanceSqr(ship.position, rock.position);
Vector2 force = Vector2Normalize(Vector2Subtract(rock.position, ship.position));
ship.velocity = Vector2Add(ship.velocity, Vector2Scale(force, ship.mass * (rock.mass / (distance/*this is pre squared*/)) * deltaTime));
// calculate position change
ship.position = Vector2Add(ship.position, Vector2Scale(ship.velocity, deltaTime));
}
}
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