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Graphics / Vertical line artifacts in simple image

« on: February 10, 2018, 06:14:59 pm »

Hello all, I apologize for the noob level question... In this basic SFML code I can't figure out where the
black vertical lines are coming from. Any help would be appreciated.

(BTW using Visual Studio 2017 on Windows 10 running on a partitioned iMac.)

int main()
{
        sf::RenderWindow window(sf::VideoMode(520, 480), "Vertical lines issue??");

        while (window.isOpen())
        {
                sf::Event event;

                window.clear();
                drawBasicFlat(window);
                window.display();

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

    return 0;
}

//-------------------------------------------------------------
void drawBasicFlat(sf::RenderWindow& theWindow)
{
        unsigned max_x = theWindow.getSize().x;
        unsigned max_y = theWindow.getSize().y;

        unsigned vertexCount;

        for (unsigned x = 0; x < max_x; ++x)
        {
                sf::VertexArray line(sf::Points, max_y);

                for (unsigned y = 0; y < max_y; ++y)
                {
                        line[y].position = sf::Vector2f(x + 1, y + 1);
                        line[y].color = sf::Color(150, 100, 75);
                }

                theWindow.draw(line);
        }
}