Debug_demo/Collisions.cpp

#include "Collisions.h"

CollisionType getCollisionWithWalls(const Ball& b, const QRectF& bounding) {
    auto ballBB = b.aabb();
    if (ballBB.right() > bounding.right()) return Right;
    if (ballBB.left() < bounding.left()) return Left;
    if (ballBB.top() < bounding.top()) return Top;
    return None;
}

CollisionType getCollisionWithBrick(const Ball& b, const QRectF& brick) {
    auto ballBB = b.aabb();
    auto inters = ballBB.intersected(brick);
    if (inters.isEmpty()) {
        return None;
    }
    else {
        if (inters.width() > inters.height()){
            if(inters.center().y()<ballBB.center().y()) {
                return Top;
            }
            else
            {
                return Bottom;
            }
        } else if(ballBB.center().x()>inters.center().x()) {
            return Left;
        } else return Right;
    }
}

bool applyCollision(Ball& b,
                    CollisionType type) {
    int mulX = 1, mulY = 1;

    switch (type) {
        case Left:
            if (b.getSpeed().x() < 0) mulX = -1;
            break;
        case Right:
            if (b.getSpeed().x() > 0) mulX = -1;
            break;
        case Top:
            if (b.getSpeed().y() < 0) mulY = -1;
            break;
        case Bottom:
            if (b.getSpeed().y() > 0) mulY = -1;
            break;
        case None:break;
    }

    if (mulX == -1 || mulY == -1) {
        b.setSpeed(QPointF(b.getSpeed().x() * mulX, b.getSpeed().y() * mulY));
        return true;
    }
    else {
        return false;
    }
}