parallax.cpp

#include <iostream>
#include <vector>
#include <SFML/Graphics.hpp>

class Scroller
{
	sf::Texture texture;
	sf::IntRect rect;
	public:
	Scroller(sf::Texture& texture)
	{
		this->texture = texture;
		texture.setRepeated(true);
		this->texture.setRepeated(true);
		rect = sf::IntRect(0, 0, 800, 480);
	}

	void scrollLeft(float pixels)
	{
		rect.left -= pixels;
	}

	void scrollRight(float pixels)
	{
		rect.left += pixels;
	}

	sf::Sprite getSprite()
	{
		sf::Sprite sprite;
		sprite.setTexture(texture);
		sprite.setTextureRect(rect);
		return sprite;
	}
};

int main()
{
	sf::RenderWindow window(sf::VideoMode(800, 480), "Parallax");
	sf::Texture sky;
	sky.loadFromFile("layers\\Sky_back_layer.png");
	sf::Texture vegetation;
	vegetation.loadFromFile("layers\\Vegetation_middle_layer.png");
	sf::Texture ground;
	ground.setRepeated(true);
	ground.loadFromFile("layers\\Ground_front_layer.png");
	std::cout << ground.getSize().x << ':' << ground.getSize().y << std::endl;

	std::vector<Scroller> scrollers {
		Scroller(ground),
		Scroller(vegetation)
	};
	int speed = 2;
	while(window.isOpen())
	{
		sf::Event event;
		while(window.pollEvent(event))
		{
			if(event.type == sf::Event::Closed)
			{
				window.close();
				break;
			}
		}
		window.clear();
		for(size_t i = 0; i < scrollers.size(); i++)
		{
			if(sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
				scrollers[i].scrollRight(speed * (i + 1));
			else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
				scrollers[i].scrollLeft(speed * (i + 1));
			window.draw(scrollers[i].getSprite());
		}
		window.display();
	}
	return 0;
}