tsp_cpp/snippets/pietMondrian.cpp

#include <SFML/Graphics.hpp>
#include <random>
#include <time.h>
#include <inttypes.h>

static constexpr int minSideLength = 15;
static constexpr float densityDecay = 0.6;

void drawRectangle(sf::RectangleShape& rectangle, sf::RenderWindow& window, const float colorMean = 0.8)
{
    static std::random_device randomDevice;
    static std::default_random_engine engine(randomDevice());
    static std::poisson_distribution<uint8_t> colorDistribution(colorMean);

    sf::Color rectangleColor;
    switch (colorDistribution(engine))
    {
        case 0:
            rectangleColor = sf::Color::White;
            break;
        case 1:
            rectangleColor = sf::Color::Blue;
            break;
        case 2:
            rectangleColor = sf::Color::Red;
            break;
        case 3:
            rectangleColor = sf::Color::Yellow;
            break;
        default:
            rectangleColor = sf::Color::White;
    }

    rectangle.setFillColor(rectangleColor);
    rectangle.setOutlineThickness(1);
    rectangle.setOutlineColor(sf::Color::Black);

    window.draw(rectangle);
}

void divide(sf::RenderWindow& window, sf::RectangleShape* area, const float density=1, const float colorMean=0.8)
{
    static std::random_device randomDevice;
    static std::default_random_engine engine(randomDevice());
    std::bernoulli_distribution divisionDistribution(density);

    if(area->getSize().x == 0 || area->getSize().y == 0)
    {
        delete(area);
    }
    else if(area->getSize().x <= 2*minSideLength && area->getSize().y <= 2*minSideLength)
    {
        drawRectangle(*area,window,colorMean);
        delete(area);
    }
    else if(divisionDistribution(engine))
    {
        const sf::Vector2f originalSize = area->getSize();
        const sf::Vector2f originalPosition = area->getPosition();

        delete(area);

        uint16_t maxX = originalSize.x - minSideLength + 1; // Add one to let the rectangle occupy all the space
        uint16_t maxY = originalSize.y - minSideLength + 1;

        uint16_t newLength = 0;
        if (maxX > minSideLength)
        {
            std::uniform_int_distribution<uint16_t> lengthDistribution(minSideLength,maxX);
            newLength = lengthDistribution(engine);
            if(newLength == originalSize.x - minSideLength + 1)
            {
                newLength = originalSize.x;
                maxY--;     // If the rectangle already occupies all x space, prevent it from occupying all y space
            }
        }
        else
        {
            newLength = originalSize.x;
        }

        uint16_t newWidth = 0;
        if (maxY > minSideLength)
        {
            std::uniform_int_distribution<uint16_t> widthDistribution(minSideLength,maxY);
            newWidth = widthDistribution(engine);
            if(newWidth == originalSize.y - minSideLength + 1)
            {
                newWidth = originalSize.y;
            }
        }
        else
        {
            newWidth = originalSize.y;
        }


        sf::RectangleShape* firstRectangle = new sf::RectangleShape(sf::Vector2f(newLength,newWidth));
        firstRectangle->setPosition(originalPosition.x,originalPosition.y);
        divide(window,firstRectangle,density*densityDecay,colorMean);

        sf::RectangleShape* secondRectangle = new sf::RectangleShape(sf::Vector2f(newLength,originalSize.y-newWidth));
        secondRectangle->setPosition(originalPosition.x,originalPosition.y+newWidth);
        divide(window,secondRectangle,density*densityDecay,colorMean);

        sf::RectangleShape* thirdRectangle = new sf::RectangleShape(sf::Vector2f(originalSize.x-newLength,newWidth));
        thirdRectangle->setPosition(originalPosition.x+newLength,originalPosition.y);
        divide(window,thirdRectangle,density*densityDecay,colorMean);

        sf::RectangleShape* fourthRectangle = new sf::RectangleShape(sf::Vector2f(originalSize.x-newLength,originalSize.y-newWidth));
        fourthRectangle->setPosition(originalPosition.x+newLength,originalPosition.y+newWidth);
        divide(window,fourthRectangle,density*densityDecay,colorMean);
    }
    else
    {
        drawRectangle(*area,window,colorMean);
        delete(area);
    }
}

int main()
{
    sf::RenderWindow window(sf::VideoMode(1067, 600), "Piet Mondrain style");

    sf::RectangleShape* originalRectangle;
    window.display();

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
            if (event.type == sf::Event::KeyPressed)
            {
                if (event.key.code == sf::Keyboard::Key::Space)
                {
                    window.clear();
                    originalRectangle = new sf::RectangleShape(sf::Vector2f(window.getSize().x,window.getSize().y));
                    divide(window,originalRectangle,1,0.6);
                    window.display();
                }
            }
        }
    }

    return 0;
}