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#include <cmath>
#include "../api/Config.h"
#include "../api/Rigidbody.h"
#include "../api/Transform.h"
#include "../api/Vector2.h"
#include "../manager/ComponentManager.h"
#include "../manager/LoopTimerManager.h"
#include "../manager/Mediator.h"
#include "PhysicsSystem.h"
using namespace crepe;
using namespace std::chrono;
void PhysicsSystem::update() {
const Mediator & mediator = this->mediator;
ComponentManager & mgr = mediator.component_manager;
LoopTimerManager & loop_timer = mediator.loop_timer;
RefVector<Rigidbody> rigidbodies = mgr.get_components_by_type<Rigidbody>();
float dt = std::chrono::duration<float>(loop_timer.get_scaled_fixed_delta_time()).count();
float gravity = Config::get_instance().physics.gravity;
for (Rigidbody & rigidbody : rigidbodies) {
if (!rigidbody.active) continue;
Transform & transform
= mgr.get_components_by_id<Transform>(rigidbody.game_object_id).front().get();
switch (rigidbody.data.body_type) {
case Rigidbody::BodyType::DYNAMIC:
if (transform.game_object_id == rigidbody.game_object_id) {
// Add gravity
if (rigidbody.data.mass <= 0) {
throw std::runtime_error("Mass must be greater than 0");
}
if (gravity <= 0) {
throw std::runtime_error("Config Gravity must be greater than 0");
}
if (rigidbody.data.gravity_scale > 0 && !rigidbody.data.constraints.y) {
rigidbody.data.linear_velocity.y
+= (rigidbody.data.mass * rigidbody.data.gravity_scale * gravity
* dt);
}
// Add coefficient rotation
if (rigidbody.data.angular_velocity_coefficient > 0) {
rigidbody.data.angular_velocity
*= std::pow(rigidbody.data.angular_velocity_coefficient, dt);
}
// Add coefficient movement horizontal
if (rigidbody.data.linear_velocity_coefficient.x > 0
&& !rigidbody.data.constraints.x) {
rigidbody.data.linear_velocity.x
*= std::pow(rigidbody.data.linear_velocity_coefficient.x, dt);
}
// Add coefficient movement horizontal
if (rigidbody.data.linear_velocity_coefficient.y > 0
&& !rigidbody.data.constraints.y) {
rigidbody.data.linear_velocity.y
*= std::pow(rigidbody.data.linear_velocity_coefficient.y, dt);
}
// Max velocity check
if (rigidbody.data.angular_velocity
> rigidbody.data.max_angular_velocity) {
rigidbody.data.angular_velocity = rigidbody.data.max_angular_velocity;
} else if (rigidbody.data.angular_velocity
< -rigidbody.data.max_angular_velocity) {
rigidbody.data.angular_velocity = -rigidbody.data.max_angular_velocity;
}
// Set max velocity to maximum length
if (rigidbody.data.linear_velocity.length()
> rigidbody.data.max_linear_velocity) {
rigidbody.data.linear_velocity.normalize();
rigidbody.data.linear_velocity *= rigidbody.data.max_linear_velocity;
}
// Move object
if (!rigidbody.data.constraints.rotation) {
transform.rotation += rigidbody.data.angular_velocity * dt;
transform.rotation = std::fmod(transform.rotation, 360.0);
if (transform.rotation < 0) {
transform.rotation += 360.0;
}
}
if (!rigidbody.data.constraints.x) {
transform.position.x += rigidbody.data.linear_velocity.x * dt;
}
if (!rigidbody.data.constraints.y) {
transform.position.y += rigidbody.data.linear_velocity.y * dt;
}
}
break;
case Rigidbody::BodyType::KINEMATIC:
break; //(scripts)
case Rigidbody::BodyType::STATIC:
break; //(unmoveable objects)
default:
break;
}
}
}
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