diff options
Diffstat (limited to 'src/gui/graphicsview')
| -rw-r--r-- | src/gui/graphicsview/qgraphicsitem.cpp | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp index 11ec24b..93cd7d9 100644 --- a/src/gui/graphicsview/qgraphicsitem.cpp +++ b/src/gui/graphicsview/qgraphicsitem.cpp @@ -3235,10 +3235,16 @@ bool QGraphicsItem::contains(const QPointF &point) const } /*! - Returns true if this item collides with \a other; otherwise returns false. - The ways items collide is determined by \a mode. The default value for \a - mode is Qt::IntersectsItemShape; \a other collides with this item if it - either intersects, contains, or is contained by this item's shape. + + Returns true if this item collides with \a other; otherwise + returns false. + + The \a mode is applied to \a other, and the resulting shape or + bounding rectangle is then compared to this item's shape. The + default value for \a mode is Qt::IntersectsItemShape; \a other + collides with this item if it either intersects, contains, or is + contained by this item's shape (see Qt::ItemSelectionMode for + details). The default implementation is based on shape intersection, and it calls shape() on both items. Because the complexity of arbitrary shape-shape @@ -3293,6 +3299,11 @@ bool QGraphicsItem::collidesWithItem(const QGraphicsItem *other, Qt::ItemSelecti Qt::IntersectsItemShape; \a path collides with this item if it either intersects, contains, or is contained by this item's shape. + Note that this function checks whether the item's shape or + bounding rectangle (depending on \a mode) is contained within \a + path, and not whether \a path is contained within the items shape + or bounding rectangle. + \sa collidesWithItem(), contains(), shape() */ bool QGraphicsItem::collidesWithPath(const QPainterPath &path, Qt::ItemSelectionMode mode) const @@ -3333,11 +3344,12 @@ bool QGraphicsItem::collidesWithPath(const QPainterPath &path, Qt::ItemSelection /*! Returns a list of all items that collide with this item. - The way collisions are detected is determined by \a mode. The default - value for \a mode is Qt::IntersectsItemShape; All items whose shape - intersects or is contained by this item's shape are returned. + The way collisions are detected is determined by applying \a mode + to items that are compared to this item, i.e., each item's shape + or bounding rectangle is checked against this item's shape. The + default value for \a mode is Qt::IntersectsItemShape. - \sa QGraphicsScene::collidingItems(), collidesWithItem() + \sa collidesWithItem() */ QList<QGraphicsItem *> QGraphicsItem::collidingItems(Qt::ItemSelectionMode mode) const { |