O'Reilly logo

Game Programming Using Qt by Lorenz Haas, Witold Wysota

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Time for action – making the item's size definable

Let's push the example of the black rectangle a step further. So far, BlackRectangle draws a fixed rectangle of size 75 x 25 pixels. It would be nice if one could define this size, so let us add the ability to define the size of the rectangle. Remember, only painting the rectangle larger does not help here because then you would break the promise regarding the bounding rectangle. So we need also to change the bounding rectangle as follows:

class BlackRectangle : public QGraphicsItem { public: BlackRectangle(QGraphicsItem *parent = 0) : QGraphicsItem(parent), m_rect(0, 0, 75, 25) {} //... QRectF boundingRect() const { return m_rect; } //... QRectF rect() const { return m_rect; } void setRect(const ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required