void draw() {
// update the mouse position and add it to the broadphase
auto mousePosition = static_cast<sf::Vector2f>(sf::Mouse::getPosition(window));
const auto mouseSize = mouseObject.getSize();
mouseObject.setPosition(mousePosition);
mousePosition -= mouseObject.getOrigin();
broadphase.addRectangle(
mousePosition.x,
mousePosition.y,
mouseSize.x,
mouseSize.y,
&mouseObject);
// move the rectangles around and add them to the broadphase
for (const auto& object : objects) {
object->setPosition(randb(0, window.getSize().x), randb(0, window.getSize().y));
const auto objectPosition = object->getPosition() - object->getOrigin();
const auto objectSize = object->getSize();
broadphase.addRectangle(
objectPosition.x,
objectPosition.y,
objectSize.x,
objectSize.y,
object);
object->setFillColor(sf::Color(0x00, 0x8B, 0x8B));
object->setOutlineColor(sf::Color::White);
}
// now query the collision pairs and change the color of objects that hit the mouse object to red
const auto &collisionPairs = broadphase.getCollisionPairs();
for (const auto &pair : collisionPairs) {
sf::RectangleShape *other = nullptr;
if (pair.first == &mouseObject)
other = (sf::RectangleShape*)pair.second;
else if (pair.second == &mouseObject)
other = (sf::RectangleShape*)pair.first;
else {
((sf::RectangleShape*)pair.first)->setOutlineColor(sf::Color::Cyan);
((sf::RectangleShape*)pair.second)->setOutlineColor(sf::Color::Cyan);
}
if (other != nullptr)
other->setFillColor(sf::Color(200, 0, 0));
}
// clear out the broadphase for the next run
broadphase.clear();
// clear the window with black color
window.clear(sf::Color::Black);
for (const auto& object : objects)
window.draw(*object);
window.draw(mouseObject);
// draw a grid to outline the buckets
const float lineThickness = 5;
const sf::Color lineColor(150, 150, 150);
sf::RectangleShape verticalLine(sf::Vector2f(lineThickness, window.getSize().y));
verticalLine.setFillColor(lineColor);
for (size_t i = 1; i < (window.getSize().x / broadphase.getCellWidth()); ++i) {
verticalLine.setPosition(i * broadphase.getCellWidth(), 0);
window.draw(verticalLine);
}
sf::RectangleShape horizontalLine(sf::Vector2f(window.getSize().x, lineThickness));
horizontalLine.setFillColor(lineColor);
for (size_t i = 1; i < (window.getSize().y / broadphase.getCellHeight()); ++i) {
horizontalLine.setPosition(0, i * broadphase.getCellHeight());
window.draw(horizontalLine);
}
}
