ball.h

#ifndef BALL_H
#define BALL_H

class Ball
{
public:
    explicit Ball(int x, int y, int r) :
        m_x(x), m_y(y), m_r(r), m_xSpeed(0), m_ySpeed(0), m_isLocked(false)
    {
    }

    void addXAcceleration(double xAcceleration) { m_xSpeed += xAcceleration; }

    void addYAcceleration(double yAcceleration) { m_ySpeed += yAcceleration; }

    void move();

    void lock();
    void unlock();
    bool isLocked() const { return m_isLocked; }

    void setCenter(int newX, int newY)
    {
        m_x = newX;
        m_y = newY;
    }

    int getX() const
    {
        return m_x;
    }

    void setX(int x)
    {
        m_x = x;
    }

    int getY() const
    {
        return m_y;
    }

    void setY(int y)
    {
        m_y = y;
    }

    int getRadius() const
    {
        return m_r;
    }

    int getMass() const
    {
        return m_r;
    }

private:
    int m_x;
    int m_y;
    int m_r;
    double m_xSpeed;
    double m_ySpeed;
    bool m_isLocked;
};

#endif // BALL_H