diff options
Diffstat (limited to 'doc/src/graphicsview.qdoc')
| -rw-r--r-- | doc/src/graphicsview.qdoc | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/doc/src/graphicsview.qdoc b/doc/src/graphicsview.qdoc index 4c408cda8..89f9f3d71 100644 --- a/doc/src/graphicsview.qdoc +++ b/doc/src/graphicsview.qdoc @@ -141,7 +141,7 @@ to scene coordinates where appropriate), before sending the events to the visualized scene. - Using its transformation matrix, QGraphicsView::matrix(), the view can + Using its transformation matrix, QGraphicsView::transform(), the view can \e transform the scene's coordinate system. This allows advanced navigation features such as zooming and rotation. For convenience, QGraphicsView also provides functions for translating between view and @@ -174,7 +174,7 @@ also provides many functions for mapping coordinates between the item and the scene, and from item to item. Also, like QGraphicsView, it can transform its coordinate system using a matrix: - QGraphicsItem::matrix(). This is useful for rotating and scaling + QGraphicsItem::transform(). This is useful for rotating and scaling individual items. Items can contain other items (children). Parent items' @@ -201,6 +201,9 @@ using an untransformed view, one unit on the scene is represented by one pixel on the screen. + \note The inverted Y-axis coordinate system (where \c y grows upwards) + is unsupported as Graphics Views uses Qt's coordinate system. + There are three effective coordinate systems in play in Graphics View: Item coordinates, scene coordinates, and view coordinates. To simplify your implementation, Graphics View provides convenience functions that @@ -458,11 +461,7 @@ By making an item a child of another, you can achieve the most essential feature of item grouping: the items will move together, and - all transformations are propagated from parent to child. QGraphicsItem - can also handle all events for its children (see - QGraphicsItem::setHandlesChildEvents()). This allows the parent item - to act on behalf of its children, effectively treating all items as - one. + all transformations are propagated from parent to child. In addition, QGraphicsItemGroup is a special item that combines child event handling with a useful interface for adding and removing items |