内容

• 特性
• 公共函数
• 信号
• 静态公共成员
• 详细描述

Q3DScene 类

Q3DScene class provides description of the 3D scene being visualized. 更多...

头：	#include <Q3DScene>
Since:	QtDataVisualization 1.0
实例化：	Scene3D
继承：	QObject

• 所有成员列表，包括继承成员

特性

activeCamera : Q3DCamera * activeLight : Q3DLight * devicePixelRatio : float graphPositionQuery : QPoint primarySubViewport : QRect

secondarySubViewport : QRect secondarySubviewOnTop : bool selectionQueryPosition : QPoint slicingActive : bool viewport : const QRect

• 1 特性继承自 QObject

公共函数

	Q3DScene (QObject * parent = Q_NULLPTR)
virtual	~Q3DScene ()
Q3DCamera *	activeCamera () const
Q3DLight *	activeLight () const
float	devicePixelRatio () const
QPoint	graphPositionQuery () const
bool	isPointInPrimarySubView (const QPoint & point )
bool	isPointInSecondarySubView (const QPoint & point )
bool	isSecondarySubviewOnTop () const
bool	isSlicingActive () const
QRect	primarySubViewport () const
QRect	secondarySubViewport () const
QPoint	selectionQueryPosition () const
void	setActiveCamera (Q3DCamera * camera )
void	setActiveLight (Q3DLight * light )
void	setDevicePixelRatio (float pixelRatio )
void	setGraphPositionQuery (const QPoint & point )
void	setPrimarySubViewport (const QRect & primarySubViewport )
void	setSecondarySubViewport (const QRect & secondarySubViewport )
void	setSecondarySubviewOnTop (bool isSecondaryOnTop )
void	setSelectionQueryPosition (const QPoint & point )
void	setSlicingActive (bool isSlicing )
QRect	viewport () const

• 32 公共函数继承自 QObject

信号

void	activeCameraChanged (Q3DCamera * camera )
void	activeLightChanged (Q3DLight * light )
void	devicePixelRatioChanged (float pixelRatio )
void	graphPositionQueryChanged (const QPoint & position )
void	primarySubViewportChanged (const QRect & subViewport )
void	secondarySubViewportChanged (const QRect & subViewport )
void	secondarySubviewOnTopChanged (bool isSecondaryOnTop )
void	selectionQueryPositionChanged (const QPoint & position )
void	slicingActiveChanged (bool isSlicingActive )
void	viewportChanged (const QRect & viewport )

• 2 信号继承自 QObject

静态公共成员

QPoint

invalidSelectionPoint ()

• 11 静态公共成员继承自 QObject

额外继承成员

• 1 公共槽继承自 QObject
• 9 保护函数继承自 QObject

详细描述

Q3DScene class provides description of the 3D scene being visualized.

The 3D scene contains a single active camera and a single active light source. Visualized data is assumed to be at a fixed location.

The 3D scene also keeps track of the viewport in which visualization rendering is done, the primary subviewport inside the viewport where the main 3D data visualization view resides and the secondary subviewport where the 2D sliced view of the data resides. The subviewports are by default resized by the Q3DScene . To override the resize behavior you need to listen to both viewportChanged () 和 slicingActiveChanged () signals and recalculate the subviewports accordingly.

Also the scene has flag for tracking if the secondary 2D slicing view is currently active or not.

注意： 并非所有可视化都支持次级 2D 切片视图。

特性文档编制

activeCamera : Q3DCamera *

This property holds the currently active camera in the 3D scene.

当新 Q3DCamera object is set, it is automatically added as child of the scene.

访问函数：

Q3DCamera *	activeCamera () const
void	setActiveCamera (Q3DCamera * camera )

通知程序信号：

void	activeCameraChanged (Q3DCamera * camera )

activeLight : Q3DLight *

This property holds the currently active light in the 3D scene.

当新 Q3DLight objects is set, it is automatically added as child of the scene.

访问函数：

Q3DLight *	activeLight () const
void	setActiveLight (Q3DLight * light )

通知程序信号：

void	activeLightChanged (Q3DLight * light )

devicePixelRatio : float

This property holds the device pixel ratio that is used when mapping input coordinates to pixel coordinates.

访问函数：

float	devicePixelRatio () const
void	setDevicePixelRatio (float pixelRatio )

通知程序信号：

void	devicePixelRatioChanged (float pixelRatio )

graphPositionQuery : QPoint

This property holds the coordinates for the user input that should be processed by the scene as a graph position query.

If this property is set to a value other than invalidSelectionPoint (), the graph tries to match a graph position to the specified coordinates within the primary viewport. After the rendering pass, this property is returned to its default state of invalidSelectionPoint (). The queried graph position can be read from the QAbstract3DGraph::queriedGraphPosition property after the next render pass.

There is no single correct 3D coordinate to match a particular screen position, so to be consistent, the queries are always done against the inner sides of an invisible box surrounding the graph.

注意： Bar graphs allow graph position queries only at the graph floor level.

访问函数：

QPoint	graphPositionQuery () const
void	setGraphPositionQuery (const QPoint & point )

通知程序信号：

void	graphPositionQueryChanged (const QPoint & position )

另请参阅 QAbstract3DGraph::queriedGraphPosition .

primarySubViewport : QRect

This property holds the current subviewport rectangle inside the viewport where the primary view of the data visualization is targeted.

若 isSlicingActive () 是 false , the primary sub viewport is equal to viewport ()。若 isSlicingActive () 是 true and the primary sub viewport has not been explicitly set, it will be one fifth of viewport ().

注意： Setting primarySubViewport larger than or outside of the viewport resizes the viewport accordingly.

访问函数：

QRect	primarySubViewport () const
void	setPrimarySubViewport (const QRect & primarySubViewport )

通知程序信号：

void	primarySubViewportChanged (const QRect & subViewport )

secondarySubViewport : QRect

This property holds the secondary viewport rectangle inside the viewport.

The secondary viewport is used for drawing the 2D slice view in some visualizations. If it has not been explicitly set, it will be equal to QRect 。若 isSlicingActive () 是 true , it will be equal to viewport .

注意： If the secondary sub viewport is larger than or outside of the viewport, the viewport is resized accordingly.

访问函数：

QRect	secondarySubViewport () const
void	setSecondarySubViewport (const QRect & secondarySubViewport )

通知程序信号：

void	secondarySubViewportChanged (const QRect & subViewport )

secondarySubviewOnTop : bool

This property holds whether the 2D slicing view or the 3D view is drawn on top.

访问函数：

bool	isSecondarySubviewOnTop () const
void	setSecondarySubviewOnTop (bool isSecondaryOnTop )

通知程序信号：

void	secondarySubviewOnTopChanged (bool isSecondaryOnTop )

selectionQueryPosition : QPoint

This property holds the coordinates for the user input that should be processed by the scene as a selection.

If this property is set to a value other than invalidSelectionPoint (), the graph tries to select a data item, axis label, or a custom item at the specified coordinates within the primary viewport. After the rendering pass, the property is returned to its default state of invalidSelectionPoint ().

访问函数：

QPoint	selectionQueryPosition () const
void	setSelectionQueryPosition (const QPoint & point )

通知程序信号：

void	selectionQueryPositionChanged (const QPoint & position )

另请参阅 QAbstract3DGraph::selectedElement .

slicingActive : bool

This property holds whether the 2D slicing view is currently active.

若 true , QAbstract3DGraph::selectionMode must have either QAbstract3DGraph::SelectionRow or QAbstract3DGraph::SelectionColumn set to a valid selection.

注意： Not all visualizations support the 2D slicing view.

访问函数：

bool	isSlicingActive () const
void	setSlicingActive (bool isSlicing )

通知程序信号：

void	slicingActiveChanged (bool isSlicingActive )

viewport : const QRect

This property holds a read only property that contains the current viewport rectangle where all the 3D rendering is targeted.

访问函数：

QRect

viewport () const

通知程序信号：

void	viewportChanged (const QRect & viewport )

成员函数文档编制

Q3DScene:: Q3DScene ( QObject * parent = Q_NULLPTR)

Constructs a basic scene with one light and one camera in it. An optional parent 参数可以给出，然后会被传递给 QObject 构造函数。

[virtual] Q3DScene:: ~Q3DScene ()

Destroys the 3D scene and all the objects contained within it.

[static] QPoint Q3DScene:: invalidSelectionPoint ()

返回 QPoint signifying an invalid selection position.

bool Q3DScene:: isPointInPrimarySubView (const QPoint & point )

Returns whether the given point resides inside the primary subview or not. Returns true if the point is inside the primary subview.

注意： If subviews are superimposed, and the given point resides inside both, result is true only when the primary subview is on top.

bool Q3DScene:: isPointInSecondarySubView (const QPoint & point )

Returns whether the given point resides inside the secondary subview or not. Returns true if the point is inside the secondary subview.

注意： If subviews are superimposed, and the given point resides inside both, result is true only when the secondary subview is on top.