starfield_cpp_1

starfield_cpp_Star.cpp

struct Star
{
    float x, y, z, radius, brightness, viewX, viewY;

    Star() { newStar(); }

    void newStar()
    {
        x = viewX = std::experimental::randint(0, WIDTH) - H_WIDTH;
        y = viewY = std::experimental::randint(0, HEIGHT) - H_HEIGHT;
        z = 256;
        brightness = 0.0;
        radius = 1.0;
    }

    bool isOffScreen()
    {
        return z <= 0 || viewX <= -H_WIDTH || viewY <= -H_HEIGHT || viewX >= H_WIDTH || viewY >= H_HEIGHT;
    }

    void processStar()
    {
        viewX = std::round(x * 256 / z);
        viewY = std::round(y * 256 / z);
        z -= speed;
        radius += radius_delta;
        if (isOffScreen()) { newStar(); }
        if (brightness < 256) { brightness += 0.15; }
    }
};