Game Programming Using Qt Beginner's Guide

Time for action – using animations to move items smoothly

In order to use it, we add a new private member called m_animation of type QPropertyAnimation and initialize it in the constructor of Player:

m_animation = new QPropertyAnimation(this);
m_animation->setTargetObject(this);
m_animation->setPropertyName("jumpFactor");
m_animation->setStartValue(0);
m_animation->setKeyValueAt(0.5, 1);
m_animation->setEndValue(0);
m_animation->setDuration(800);
m_animation->setEasingCurve(QEasingCurve::OutInQuad);

What just happened?

For the instance of QPropertyAnimation created here, we define the item as parent; thus, the animation will get deleted when the scene deletes the item and we don't have to worry about freeing the used memory. Then we define the ...