voxel-raycaster/src/Camera.cpp

#pragma once
#include "Camera.h"
#include "Pub_Sub.h"


Camera::Camera() {
}


Camera::Camera(sf::Vector3f position, sf::Vector2f direction) :
	position(position), direction(direction)
	{

}

Camera::~Camera() {
}

int Camera::set_position(sf::Vector3f position) {
	this->position = position;
	return 1;
}
	
int Camera::add_static_impulse(sf::Vector3f impulse) {
	movement += impulse;
	return 1;
}

int Camera::add_relative_impulse(DIRECTION impulse_direction, float speed) {
	
	// No sense in doing fancy dot products, adding Pi's will suffice
	// Always add PI/2 to X initially to avoid negative case
	sf::Vector2f dir;

	switch (impulse_direction) {
	
	case DIRECTION::FORWARD:
		dir = sf::Vector2f(direction.y, direction.x);
		break;
	case DIRECTION::REARWARD:
		dir = sf::Vector2f(direction.y, direction.x + PI_F);
		break;
	case DIRECTION::LEFT:
		dir = sf::Vector2f(direction.y + PI_F + PI_F / 2, PI_F / 2);
		break;
	case DIRECTION::RIGHT:
		dir = sf::Vector2f(direction.y + PI_F / 2, PI_F / 2);
		break;
	case DIRECTION::UP:
		dir = sf::Vector2f(direction.y, direction.x + PI_F / 2);
		break;
	case DIRECTION::DOWN:
		dir = sf::Vector2f(direction.y + PI_F, (direction.x * -1) + PI_F / 2 );
		break;

	}

	movement += SphereToCart(dir);
	movement *= speed;

	return 1;
}

int Camera::slew_camera(sf::Vector2f input) {
	direction -= input;
	return 1;
}

void Camera::set_camera(sf::Vector2f input) {
	direction = input;
}

void Camera::set_camera(sf::Vector3f input) {
	direction = CartToNormalizedSphere(input);
}

int Camera::update(double delta_time) {
	
	double multiplier = 40;

	position.x += static_cast<float>(movement.x * delta_time * multiplier);
	position.y += static_cast<float>(movement.y * delta_time * multiplier);
	position.z += static_cast<float>(movement.z * delta_time * multiplier);
	
	movement *= static_cast<float>(friction_coefficient * delta_time * multiplier);
	
	return 1;
}

void Camera::recieve_event(VrEventPublisher* publisher, std::unique_ptr<vr::Event> event) {

	if (event.get()->type == vr::Event::KeyHeld) {

		vr::KeyHeld *held_event = static_cast<vr::KeyHeld*>(event.get());

		float speed = 1.0f;

		if (held_event->code == sf::Keyboard::LShift) {
			speed = 0.2f;
		}
		else if (held_event->code == sf::Keyboard::C) {
			look_at_center();
		}
		else if (held_event->code == sf::Keyboard::Q) {
			add_relative_impulse(Camera::DIRECTION::DOWN, speed);
		}
		else if (held_event->code == sf::Keyboard::E) {
			add_relative_impulse(Camera::DIRECTION::UP, speed);
		}
		else if (held_event->code == sf::Keyboard::W) {
			add_relative_impulse(Camera::DIRECTION::FORWARD, speed);
		}
		else if (held_event->code == sf::Keyboard::S) {
			add_relative_impulse(Camera::DIRECTION::REARWARD, speed);
		}
		else if (held_event->code == sf::Keyboard::A) {
			add_relative_impulse(Camera::DIRECTION::LEFT, speed);
		}
		else if (held_event->code == sf::Keyboard::D) {
			add_relative_impulse(Camera::DIRECTION::RIGHT, speed);
		}
		else if (held_event->code == sf::Keyboard::T) {
			set_position(sf::Vector3f(50, 50, 50));
		}
	}


}

void Camera::look_at_center() {

	direction = CartToNormalizedSphere(sf::Vector3f(75, 75, 75) - position);
}

sf::Vector2f* Camera::get_direction_pointer() {
	return &direction;
}

sf::Vector3f* Camera::get_movement_pointer() {
	return &movement;
}

sf::Vector3f* Camera::get_position_pointer() {
	return &position;
}

sf::Vector3f Camera::get_movement() {
	return movement;
}

sf::Vector3f Camera::get_position() {
	return position;
}

sf::Vector2f Camera::get_direction() {
	return direction;
}