Topics

1

Graphics / Move the view if the entity's out view.

« on: June 11, 2018, 09:48:45 am »

How can I make the view follow the player entity when it's nearly out of the drone's (the view) view.
I have here my code for the drone's movement.

void World::update(const sf::Time& deltaTime)
{
        mSceneGraph.update(deltaTime);
        mDrone.setCenter(mPlayer->getPosition());
}
 

What I want to achieve is to make the drone follow the player, but not really following the player's new position as it moves real-time. Instead, the drone will SMOOTHLY MOVE if the player is NEARLY OUT OF VIEW (not hitting the view's boundary).

2

Graphics / Rectangle collision detection is not accurate

« on: June 04, 2018, 04:10:30 pm »

The problem is the rect is not actually entirely hitting the wall. As you can see in the image, there's a little gap between them, and the gap's size is random.

int main()
{
        sf::RenderWindow window(sf::VideoMode(1920, 1080), "SFML Test");

        float rectVel = 200.f;
        sf::RectangleShape rect({ 50, 50 });
        sf::Vector2f rectOffset;
        rect.setFillColor(sf::Color::Red);
        rect.setPosition(static_cast<sf::Vector2f>(window.getSize()) / 2.f);

        sf::RectangleShape wall({ 20, 70 });
        wall.setFillColor(sf::Color::Blue);
        wall.setPosition(300.f, 200.f);

        sf::Clock timer;

        while (window.isOpen())
        {
                sf::Time deltaTime = timer.restart();

                sf::Event ev;
                while (window.pollEvent(ev))
                {
                        switch (ev.type)
                        {
                                case sf::Event::Closed:
                                        window.close();
                                        break;
                        }
                }

                if (sf::Keyboard::isKeyPressed(sf::Keyboard::W))
                {
                        rect.move(0.f, -rectVel * deltaTime.asSeconds());
                        if (wall.getGlobalBounds().intersects(rect.getGlobalBounds()))
                                rect.move(0.f, rectVel * deltaTime.asSeconds());
                }
                else if (sf::Keyboard::isKeyPressed(sf::Keyboard::S))
                {
                        rect.move(0.f, rectVel * deltaTime.asSeconds());
                        if (wall.getGlobalBounds().intersects(rect.getGlobalBounds()))
                                rect.move(0.f, -rectVel * deltaTime.asSeconds());
                }

                if (sf::Keyboard::isKeyPressed(sf::Keyboard::A))
                {
                        rect.move(-rectVel * deltaTime.asSeconds(), 0.f);
                        if (wall.getGlobalBounds().intersects(rect.getGlobalBounds()))
                                rect.move(rectVel * deltaTime.asSeconds(), 0.f);
                }
                else if (sf::Keyboard::isKeyPressed(sf::Keyboard::D))
                {
                        rect.move(rectVel * deltaTime.asSeconds(), 0.f);
                        if (wall.getGlobalBounds().intersects(rect.getGlobalBounds()))
                                rect.move(-rectVel * deltaTime.asSeconds(), 0.f);
                }

                window.clear(sf::Color::White);
                window.draw(wall);
                window.draw(rect);

                window.display();
        }

        return 0;
}

3

Window / Use setFrameLimit and setVerticalSyncEnabled together

« on: May 22, 2018, 06:01:06 am »

Can I use setFrameLimit and setVerticalSyncEnabled together after I'd created a window because I will be adding a vertical sync setting into my game, and I'm not pretty sure if setVerticalSyncEnabled will override the FPS that I've passed into the setFrameLimit.