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-rw-r--r--src/gui/styles/qstyleoption.cpp52
1 files changed, 36 insertions, 16 deletions
diff --git a/src/gui/styles/qstyleoption.cpp b/src/gui/styles/qstyleoption.cpp
index ce053ae..e441101 100644
--- a/src/gui/styles/qstyleoption.cpp
+++ b/src/gui/styles/qstyleoption.cpp
@@ -48,6 +48,7 @@
#ifndef QT_NO_DEBUG
#include <qdebug.h>
#endif
+#include <QtCore/qmath.h>
QT_BEGIN_NAMESPACE
@@ -4998,6 +4999,34 @@ QStyleOptionGraphicsItem::QStyleOptionGraphicsItem(int version)
}
/*!
+ \since 4.6
+
+ Returns the level of detail from the \a worldTransform.
+
+ Its value represents the maximum value of the height and
+ width of a unity rectangle, mapped using the \a worldTransform
+ of the painter used to draw the item. By default, if no
+ transformations are applied, its value is 1. If zoomed out 1:2, the level
+ of detail will be 0.5, and if zoomed in 2:1, its value is 2.
+
+ For more advanced level-of-detail metrics, use
+ QStyleOptionGraphicsItem::matrix directly.
+
+ \sa QStyleOptionGraphicsItem::matrix
+*/
+qreal QStyleOptionGraphicsItem::levelOfDetailFromTransform(const QTransform &worldTransform)
+{
+ if (worldTransform.type() <= QTransform::TxTranslate)
+ return 1; // Translation only? The LOD is 1.
+
+ // Two unit vectors.
+ QLineF v1(0, 0, 1, 0);
+ QLineF v2(0, 0, 0, 1);
+ // LOD is the transformed area of a 1x1 rectangle.
+ return qSqrt(worldTransform.map(v1).length() * worldTransform.map(v2).length());
+}
+
+/*!
\fn QStyleOptionGraphicsItem::QStyleOptionGraphicsItem(const QStyleOptionGraphicsItem &other)
Constructs a copy of \a other.
@@ -5029,19 +5058,10 @@ QStyleOptionGraphicsItem::QStyleOptionGraphicsItem(int version)
/*!
\variable QStyleOptionGraphicsItem::levelOfDetail
- \brief a simple metric for determining an item's level of detail
-
- This simple metric provides an easy way to determine the level of detail
- for an item. Its value represents the maximum value of the height and
- width of a unity rectangle, mapped using the complete transformation
- matrix of the painter used to draw the item. By default, if no
- transformations are applied, its value is 1. If zoomed out 1:2, the level
- of detail will be 0.5, and if zoomed in 2:1, its value is 2.
-
- For more advanced level-of-detail metrics, use
- QStyleOptionGraphicsItem::matrix directly.
+ \obsolete
- \sa QStyleOptionGraphicsItem::matrix
+ Use QStyleOptionGraphicsItem::levelOfDetailFromTransform
+ together with QPainter::worldTransform() instead.
*/
/*!
@@ -5342,10 +5362,10 @@ QDebug operator<<(QDebug debug, const QStyleOption &option)
{
debug << "QStyleOption(";
debug << QStyleOption::OptionType(option.type);
- debug << "," << (option.direction == Qt::RightToLeft ? "RightToLeft" : "LeftToRight");
- debug << "," << option.state;
- debug << "," << option.rect;
- debug << ")";
+ debug << ',' << (option.direction == Qt::RightToLeft ? "RightToLeft" : "LeftToRight");
+ debug << ',' << option.state;
+ debug << ',' << option.rect;
+ debug << ')';
return debug;
}
#endif