gistfile1.cpp

#include <SFML/Graphics.hpp>

int width = 200;
int height = 200;

sf::VertexArray varray(sf::Points);
sf::Vertex vertex;

void stripes()
{
  varray.clear();
	varray.resize(width * height);
	for (int y = 0; y < height; y++)
	{
		for (int x = 0; x < width; x++)
		{
			vertex.position = sf::Vector2f(x, y);
			vertex.color = sf::Color::White;
			if ((x % 10) == 0){vertex.color = sf::Color::Red;}
			varray.append(vertex);
		}
	}
}

int main()
{
    sf::Vector2u windowsize;
	sf::RenderWindow window(sf::VideoMode(width, height), "Resize Test");
	stripes();

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();

			if (event.type == sf::Event::Resized)
			{
				windowsize = window.getSize();
				width = windowsize.x;
				height = windowsize.y;
				stripes();
				window.create(sf::VideoMode(width, height), "Resize Test");
			}
        }
        window.clear();
        window.draw(varray);
        window.display();
    }
    return 0;
}