QGraphicsScale 类提供比例缩放变换。 更多...
头: | #include <QGraphicsScale> |
CMake: |
find_package(Qt6 COMPONENTS Widgets REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Widgets) |
qmake: | QT += widgets |
继承: | QGraphicsTransform |
QGraphicsScale (QObject * parent = nullptr) | |
virtual | ~QGraphicsScale () |
QVector3D | origin () const |
void | setOrigin (const QVector3D & point ) |
void | setXScale (qreal) |
void | setYScale (qreal) |
void | setZScale (qreal) |
qreal | xScale () const |
qreal | yScale () const |
qreal | zScale () const |
virtual void | applyTo (QMatrix4x4 * matrix ) const override |
void | originChanged () |
void | scaleChanged () |
void | xScaleChanged () |
void | yScaleChanged () |
void | zScaleChanged () |
QGraphicsScene 提供帮助控制应如何应用比例缩放的某些参数。
The origin is the point that the item is scaled from (i.e., it stays fixed relative to the parent as the rest of the item grows). By default the origin is QPointF (0, 0).
参数 xScale , yScale ,和 zScale describe the scale factors to apply in horizontal, vertical, and depth directions. They can take on any value, including 0 (to collapse the item to a point) or negative value. A negative xScale value will mirror the item horizontally. A negative yScale value will flip the item vertically. A negative zScale will flip the item end for end.
另请参阅 QGraphicsTransform , QGraphicsItem::setScale (),和 QTransform::scale ().
This property holds the origin of the scale in 3D space.
All scaling will be done relative to this point (i.e., this point will stay fixed, relative to the parent, when the item is scaled).
访问函数:
QVector3D | origin () const |
void | setOrigin (const QVector3D & point ) |
通知程序信号:
void | originChanged () |
另请参阅 xScale , yScale ,和 zScale .
This property holds the horizontal scale factor.
The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be mirrored horizontally around its origin.
访问函数:
qreal | xScale () const |
void | setXScale (qreal) |
通知程序信号:
void | xScaleChanged () |
另请参阅 yScale , zScale ,和 origin .
This property holds the vertical scale factor.
The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be flipped vertically around its origin.
访问函数:
qreal | yScale () const |
void | setYScale (qreal) |
通知程序信号:
void | yScaleChanged () |
另请参阅 xScale , zScale ,和 origin .
This property holds the depth scale factor.
The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be flipped end for end around its origin.
访问函数:
qreal | zScale () const |
void | setZScale (qreal) |
通知程序信号:
void | zScaleChanged () |
另请参阅 xScale , yScale ,和 origin .
Constructs an empty QGraphicsScale object with the given parent .
[signal]
void
QGraphicsScale::
originChanged
()
QGraphicsScale emits this signal when its origin changes.
注意: 通知程序信号对于特性 origin .
另请参阅 QGraphicsScale::origin .
[signal]
void
QGraphicsScale::
scaleChanged
()
此信号被发射每当 xScale , yScale ,或 zScale of the object changes.
另请参阅 QGraphicsScale::xScale , QGraphicsScale::yScale ,和 QGraphicsScale::zScale .
[signal]
void
QGraphicsScale::
xScaleChanged
()
此信号被发射每当 xScale 特性改变。
注意: 通知程序信号对于特性 xScale .
[signal]
void
QGraphicsScale::
yScaleChanged
()
此信号被发射每当 yScale 特性改变。
注意: 通知程序信号对于特性 yScale .
[signal]
void
QGraphicsScale::
zScaleChanged
()
此信号被发射每当 zScale 特性改变。
注意: 通知程序信号对于特性 zScale .
[virtual]
QGraphicsScale::
~QGraphicsScale
()
Destroys the graphics scale.
[override virtual]
void
QGraphicsScale::
applyTo
(
QMatrix4x4
*
matrix
) const
重实现: QGraphicsTransform::applyTo (QMatrix4x4 *matrix) const.