Obsolete Members for QStyleOptionGraphicsItem

以下成員源於類 QStyleOptionGraphicsItem 已過時。 提供它們是為使舊源代碼能繼續工作。強烈建議不要在新代碼中使用它們。

公共變量

(obsolete) qreal	levelOfDetail
(obsolete) QMatrix	matrix

成員變量文檔編製

qreal QStyleOptionGraphicsItem:: levelOfDetail

使用 QStyleOptionGraphicsItem::levelOfDetailFromTransform () together with QPainter::worldTransform () 代替。

QMatrix QStyleOptionGraphicsItem:: matrix

This variable holds the complete transformation matrix for the item

The QMatrix provided through this member does include information about any perspective transformations applied to the view or item. To get the correct transformation matrix, use QPainter::transform () on the painter passed into the QGraphicsItem::paint () 實現。

This matrix is the combination of the item's scene matrix and the matrix of the painter used for drawing the item. It is provided for convenience, allowing anvanced level-of-detail metrics that can be used to speed up item drawing.

To find the dimensions of an item in screen coordinates (i.e., pixels), you can use the mapping functions of QMatrix ，譬如 QMatrix::map ().

This member is only initialized for items that have the QGraphicsItem::ItemUsesExtendedStyleOption 設置標誌。

另請參閱 QStyleOptionGraphicsItem::levelOfDetailFromTransform ().