C++ SFML: How to successfully Iteratively render shapes? - c++

Question

I'm looking to iteratively create a set of rectangle shapes of different colours and display them on the screen in different positions. This should produce a maze made up of rectangles.
The positions of the shapes should reflect the array that stores a 9x9 maze.
I'm able to successfully create a single shape, change it's colour and position. However, when I try to do the same to a shape inside an array it does not work. Only a single blue rectangle is generated in the top right corner of the screen.
int main() {
sf::RenderWindow window(sf::VideoMode(1920, 1080), "Baphomet");
sf::RectangleShape tiles[81] = {sf::RectangleShape(sf::Vector2f(20, 20))};
char maze[81] = {0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 0, 1, 0, 1, 1, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 1, 1, 0, 1, 0, 1, 0,
0, 0, 0, 1, 0, 1, 0, 1, 0,
0, 1, 1, 1, 0, 1, 1, 1, 0,
0, 0, 1, 0, 0, 0, 1, 0, 0,
0, 0, 1, 1, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0};
int x;
int y;
for (int i = 0; i < 81; i++) {
if (maze[i] == 0) {
tiles[i].setFillColor(sf::Color::Blue);
} else if (maze[i] == 1) {
tiles[i].setFillColor(sf::Color::Red);
}
x = (i % 9) * 20;
y = (i / 9) * 20;
std::cout << x << " " << y << std::endl;
tiles[i].setPosition((float)x, (float)y);
}
while (window.isOpen())
{
sf::Event event;
while (window.pollEvent(event))
{
if (event.type == sf::Event::Closed)
window.close();
}
window.clear();
for (int i = 0; i < 81; i++) {
window.draw(tiles[i]);
}
window.display();
}
return 0;
}
How can I make the shapes change their positions to the x and y variables successfully?

Answer 1

I think the main problem is the definition
sf::RectangleShape tiles[81] = {sf::RectangleShape(sf::Vector2f(20, 20))};
Here you explicitly initialize only the first element (tiles[0]). All the rest of the elements will only have default-constructed shape objects.
To properly initialize all elements to the same values, either use a loop
for (auto& shape : tiles)
shape = sf::RectangleShape(sf::Vector2f(20, 20));
Or use a vector
std::vector<sf::RectangleShape> tiles(81, sf::RectangleShape(sf::Vector2f(20, 20)));