SFML Wall Drawing Example

outline.cpp

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

struct wall {
	float x1, y1, x2, y2;
	
	wall(float x1, float y1, float x2, float y2) : x1(x1), y1(y1), x2(x2), y2(y2) {}
};


int main(int argc, char **argv) {
	sf::RenderWindow window(sf::VideoMode(320, 240), "Outlines Test");
	
	// Just defining some walls
	// You'd read this from a file
	std::vector<wall> walldata;
	// Let's just add four walls around our room
	walldata.push_back(wall(10, 10, 210, 10));
	walldata.push_back(wall(210, 10, 210, 110));
	walldata.push_back(wall(10, 110, 210, 110));
	walldata.push_back(wall(10, 10, 10, 110));
	
	// Some wall pointing inwards
	walldata.push_back(wall(60, 10, 60, 60));
	
	sf::Color outlinecolor(sf::Color::Black);
	sf::Color wallcolor(sf::Color::White);
	
	sf::VertexArray walls(sf::Quads);
	// Let's first add the outlines, since those have to be drawn first
	for (unsigned int i = 0; i < walldata.size(); ++i) {
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x1 - 4, walldata[i].y1 - 4), outlinecolor)); // top left corner
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x2 + 4, walldata[i].y1 - 4), outlinecolor)); // top right corner
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x2 + 4, walldata[i].y2 + 4), outlinecolor)); // bottom right corner
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x1 - 4, walldata[i].y2 + 4), outlinecolor)); // bottom left corner
	}
	// And now the walls again, this time with their actual color
	for (unsigned int i = 0; i < walldata.size(); ++i) {
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x1 - 2, walldata[i].y1 - 2), wallcolor)); // top left corner
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x2 + 2, walldata[i].y1 - 2), wallcolor)); // top right corner
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x2 + 2, walldata[i].y2 + 2), wallcolor)); // bottom right corner
		walls.append(sf::Vertex(sf::Vector2f(walldata[i].x1 - 2, walldata[i].y2 + 2), wallcolor)); // bottom left corner
	}
	
	while (window.isOpen()) {
		sf::Event event;
		while (window.pollEvent(event)) {
			if (event.type == sf::Event::Closed)
				window.close();
		}
		
		window.clear(sf::Color(0, 64, 128));
		window.draw(walls);
		window.display();
	}
	return 0;
}