22 class DtCoordinateSystem;
37 virtual void tick(
double dt);
43 virtual bool haveValidUpperLeftCorner()
const;
44 virtual bool haveValidUpperRightCorner()
const;
45 virtual bool haveValidLowerRightCorner()
const;
46 virtual bool haveValidLowerLeftCorner()
const;
51 virtual DtVector upperLeftCorner()
const;
52 virtual DtVector upperRightCorner()
const;
53 virtual DtVector lowerRightCorner()
const;
54 virtual DtVector lowerLeftCorner()
const;
59 virtual void updateTargetCorners();
63 virtual void slot_coordinateSystemChanged();