内容

• 公共类型
• 特性
• 公共函数
• 公共槽
• 信号
• 详细描述

QCamera 类

class Qt3DRender ::QCamera

The QCamera class defines a view point through which the scene will be rendered. 更多...

头：	#include <Qt3DRender/QCamera>
qmake:	QT += 3drender
Since:	Qt 5.5
实例化：	Camera
继承：	Qt3DCore::QEntity

该类在 Qt 5.5 引入。

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• 过时成员

公共类型

enum	CameraTranslationOption { TranslateViewCenter, DontTranslateViewCenter }

特性

aspectRatio : float bottom : float exposure : float farPlane : float fieldOfView : float left : float lens : Qt3DRender::QCameraLens* const nearPlane : float position : QVector3D

projectionMatrix : QMatrix4x4 projectionType : Qt3DRender::QCameraLens::ProjectionType right : float top : float transform : Qt3DCore::QTransform* const upVector : QVector3D viewCenter : QVector3D viewVector : const QVector3D

公共函数

	QCamera (Qt3DCore::QNode * parent = nullptr)
float	aspectRatio () const
float	bottom () const
float	exposure () const
float	farPlane () const
float	fieldOfView () const
float	left () const
Qt3DRender::QCameraLens *	lens () const
float	nearPlane () const
void	pan (float angle )
void	pan (float angle , const QVector3D & axis )
void	panAboutViewCenter (float angle )
void	panAboutViewCenter (float angle , const QVector3D & axis )
QQuaternion	panRotation (float angle ) const
QVector3D	position () const
QMatrix4x4	projectionMatrix () const
QCameraLens::ProjectionType	projectionType () const
float	right () const
void	roll (float angle )
void	rollAboutViewCenter (float angle )
QQuaternion	rollRotation (float angle ) const
void	rotate (const QQuaternion & q )
void	rotateAboutViewCenter (const QQuaternion & q )
QQuaternion	rotation (float angle , const QVector3D & axis ) const
void	tilt (float angle )
void	tiltAboutViewCenter (float angle )
QQuaternion	tiltRotation (float angle ) const
float	top () const
Qt3DCore::QTransform *	transform () const
void	translate (const QVector3D & vLocal , Qt3DRender::QCamera::CameraTranslationOption option = TranslateViewCenter)
void	translateWorld (const QVector3D & vWorld , Qt3DRender::QCamera::CameraTranslationOption option = TranslateViewCenter)
QVector3D	upVector () const
QVector3D	viewCenter () const
QVector3D	viewVector () const

公共槽

void	setAspectRatio (float aspectRatio )
void	setBottom (float bottom )
void	setExposure (float exposure )
void	setFarPlane (float farPlane )
void	setFieldOfView (float fieldOfView )
void	setLeft (float left )
void	setNearPlane (float nearPlane )
void	setPosition (const QVector3D & position )
void	setProjectionMatrix (const QMatrix4x4 & projectionMatrix )
void	setProjectionType (QCameraLens::ProjectionType type )
void	setRight (float right )
void	setTop (float top )
void	setUpVector (const QVector3D & upVector )
void	setViewCenter (const QVector3D & viewCenter )
void	viewAll ()
void	viewEntity (Qt3DCore::QEntity * entity )
void	viewSphere (const QVector3D & center , float radius )

信号

void	aspectRatioChanged (float aspectRatio )
void	bottomChanged (float bottom )
void	exposureChanged (float exposure )
void	farPlaneChanged (float farPlane )
void	fieldOfViewChanged (float fieldOfView )
void	leftChanged (float left )
void	nearPlaneChanged (float nearPlane )
void	positionChanged (const QVector3D & position )
void	projectionMatrixChanged (const QMatrix4x4 & projectionMatrix )
void	projectionTypeChanged (QCameraLens::ProjectionType projectionType )
void	rightChanged (float right )
void	topChanged (float top )
void	upVectorChanged (const QVector3D & upVector )
void	viewCenterChanged (const QVector3D & viewCenter )
void	viewVectorChanged (const QVector3D & viewVector )

详细描述

成员类型文档编制

enum QCamera:: CameraTranslationOption

This enum specifies how camera view center is translated

常量	值	描述
Qt3DRender::QCamera::TranslateViewCenter	0	Translate the view center causing the view direction to remain the same
Qt3DRender::QCamera::DontTranslateViewCenter	1	Don't translate the view center causing the view direction to change

特性文档编制

aspectRatio : float

Holds the current aspect ratio.

访问函数：

float	aspectRatio () const
void	setAspectRatio (float aspectRatio )

通知程序信号：

void	aspectRatioChanged (float aspectRatio )

bottom : float

Holds the current bottom of the camera.

This property is only relevant when projectionType is QCameraLens::OrthographicProjection .

访问函数：

float	bottom () const
void	setBottom (float bottom )

通知程序信号：

void	bottomChanged (float bottom )

exposure : float

Holds the current exposure of the camera.

The default value is 0.0.

MetalRoughMaterial in Qt 3D Extras is currently the only provided material that makes use of camera exposure. Negative values will cause the material to be darker, and positive values will cause it to be lighter.

Custom materials may choose to interpret the value differently.

访问函数：

float	exposure () const
void	setExposure (float exposure )

通知程序信号：

void	exposureChanged (float exposure )

farPlane : float

Holds the current camera far plane. Objects that are farther from the camera than the farPlane will not be rendered.

访问函数：

float	farPlane () const
void	setFarPlane (float farPlane )

通知程序信号：

void	farPlaneChanged (float farPlane )

fieldOfView : float

Holds the current vertical field of view in degrees.

Along with aspectRatio , this property determines how much of the scene is visible to the camera. In that respect you might think of it as analogous to choosing a wide angle (wide horizontal field of view) or telephoto (narrow horizontal field of view) lens depending on how much of a scene you want to capture.

fieldOfView is only relevant when projectionType is QCameraLens::PerspectiveProjection .

访问函数：

float	fieldOfView () const
void	setFieldOfView (float fieldOfView )

通知程序信号：

void	fieldOfViewChanged (float fieldOfView )

left : float

Holds the current left of the camera.

This property is only relevant when projectionType is QCameraLens::OrthographicProjection .

访问函数：

float	left () const
void	setLeft (float left )

通知程序信号：

void	leftChanged (float left )

lens : Qt3DRender::QCameraLens * const

保持 Qt3DRender::QCameraLens component of the camera.

该特性在 Qt 5.14 引入。

访问函数：

Qt3DRender::QCameraLens *

lens () const

nearPlane : float

Holds the current camera near plane. Objects that are closer to the camera than the nearPlane will not be rendered.

访问函数：

float	nearPlane () const
void	setNearPlane (float nearPlane )

通知程序信号：

void	nearPlaneChanged (float nearPlane )

position : QVector3D

Holds the camera's position in coordinates relative to the parent entity.

访问函数：

QVector3D	位置 () const
void	setPosition (const QVector3D & position )

通知程序信号：

void	positionChanged (const QVector3D & position )

projectionMatrix : QMatrix4x4

Holds the current projection matrix of the camera.

访问函数：

QMatrix4x4	projectionMatrix () const
void	setProjectionMatrix (const QMatrix4x4 & projectionMatrix )

通知程序信号：

void	projectionMatrixChanged (const QMatrix4x4 & projectionMatrix )

projectionType : Qt3DRender::QCameraLens::ProjectionType

Holds the type of the camera projection. The default value is QCameraLens::PerspectiveProjection .

• QCameraLens::OrthographicProjection - Parallel lines appear parallel. Objects appear the same size regardless of distance.
• QCameraLens::PerspectiveProjection - Parallel lines appear to meet in the distance. Objects appear to shrink the farther they are from the camera.
• QCameraLens::FrustumProjection
• QCameraLens::CustomProjection

访问函数：

QCameraLens::ProjectionType	projectionType () const
void	setProjectionType (QCameraLens::ProjectionType type )

通知程序信号：

void	projectionTypeChanged (QCameraLens::ProjectionType projectionType )

另请参阅 Qt3DRender::QCameraLens::ProjectionType .

right : float

Holds the current right of the camera.

This property is only relevant when projectionType is QCameraLens::OrthographicProjection .

访问函数：

float	right () const
void	setRight (float right )

通知程序信号：

void	rightChanged (float right )

top : float

Holds the current top of the camera.

This property is only relevant when projectionType is QCameraLens::OrthographicProjection .

访问函数：

float	top () const
void	setTop (float top )

通知程序信号：

void	topChanged (float top )

transform : Qt3DCore::QTransform * const

保持 Qt3DCore::QTransform component of the camera.

该特性在 Qt 5.14 引入。

访问函数：

Qt3DCore::QTransform *

transform () const

upVector : QVector3D

Holds the camera's up vector in coordinates relative to the parent entity.

The up vector indicates which direction the top of the camera is facing. Think of taking a picture: after positioning yourself and pointing the camera at your target, you might rotate the camera left or right, giving you a portrait or landscape (or angled!) shot. upVector allows you to control this type of movement.

访问函数：

QVector3D	upVector () const
void	setUpVector (const QVector3D & upVector )

通知程序信号：

void	upVectorChanged (const QVector3D & upVector )

viewCenter : QVector3D

Holds the camera's view center in coordinates relative to the parent entity.

Intuitively, the viewCenter is the location the camera is pointing at.

访问函数：

QVector3D	viewCenter () const
void	setViewCenter (const QVector3D & viewCenter )

通知程序信号：

void	viewCenterChanged (const QVector3D & viewCenter )

viewVector : const QVector3D

Holds the camera's view vector in coordinates relative to the parent entity.

This vector decribes the displacement from the camera ( position ) to its target ( viewCenter ).

访问函数：

QVector3D

viewVector () const

通知程序信号：

void	viewVectorChanged (const QVector3D & viewVector )

成员函数文档编制

QCamera:: QCamera ( Qt3DCore::QNode * parent = nullptr)

Creates a new QCamera instance with the specified parent .

[slot] void QCamera:: setAspectRatio ( float aspectRatio )

Sets the camera's aspect ratio to aspectRatio .

注意： Setter 函数对于特性 aspectRatio .

另请参阅 aspectRatio ().

[slot] void QCamera:: setBottom ( float bottom )

Sets the bottom of the camera to bottom .

注意： Setter 函数对于特性 bottom .

另请参阅 bottom ().

[slot] void QCamera:: setExposure ( float exposure )

Sets the camera's exposure to exposure .

注意： Setter 函数对于特性 exposure .

另请参阅 exposure ().

[slot] void QCamera:: setFarPlane ( float farPlane )

Sets the camera's far plane to farPlane

注意： Setter 函数对于特性 farPlane .

另请参阅 farPlane ().

[slot] void QCamera:: setFieldOfView ( float fieldOfView )

Sets the camera's field of view to fieldOfView in degrees.

注意： Setter 函数对于特性 fieldOfView .

另请参阅 fieldOfView ().

[slot] void QCamera:: setLeft ( float left )

Sets the left of the camera to left .

注意： Setter 函数对于特性 left .

另请参阅 left ().

[slot] void QCamera:: setNearPlane ( float nearPlane )

Sets the camera's near plane to nearPlane .

注意： Setter 函数对于特性 nearPlane .

另请参阅 nearPlane ().

[slot] void QCamera:: setPosition (const QVector3D & position )

Sets the camera's position in 3D space to position .

注意： Setter 函数对于特性 position .

另请参阅 position ().

[slot] void QCamera:: setProjectionMatrix (const QMatrix4x4 & projectionMatrix )

Sets the camera's projection matrix to projectionMatrix .

注意： Setter 函数对于特性 projectionMatrix .

另请参阅 projectionMatrix ().

[slot] void QCamera:: setProjectionType ( QCameraLens::ProjectionType type )

Sets the camera's projection type to type .

注意： Setter 函数对于特性 projectionType .

另请参阅 projectionType ().

[slot] void QCamera:: setRight ( float right )

Sets the right of the camera to right .

注意： Setter 函数对于特性 right .

另请参阅 right ().

[slot] void QCamera:: setTop ( float top )

Sets the top of the camera to top .

注意： Setter 函数对于特性 top .

另请参阅 top ().

[slot] void QCamera:: setUpVector (const QVector3D & upVector )

Sets the camera's up vector to upVector .

注意： Setter 函数对于特性 upVector .

另请参阅 upVector ().

[slot] void QCamera:: setViewCenter (const QVector3D & viewCenter )

Sets the camera's view center to viewCenter .

注意： Setter 函数对于特性 viewCenter .

另请参阅 viewCenter ().

[slot] void QCamera:: viewAll ()

Rotates and moves the camera so that it's viewCenter is the center of the scene's bounding volume and the entire scene fits in the view port.

注意： Only works if the lens is in perspective or orthographic projection mode.

另请参阅 Qt3D.Render::Camera::projectionType .

[slot] void QCamera:: viewEntity ( Qt3DCore::QEntity * entity )

Rotates and moves the camera so that it's viewCenter is the center of the entity 's bounding volume and the entire entity fits in the view port.

注意： Only works if the lens is in perspective or orthographic projection mode.

另请参阅 Camera.projectionType .

[slot] void QCamera:: viewSphere (const QVector3D & center , float radius )

Rotates and moves the camera so that it's viewCenter is center and a sphere of radius fits in the view port.

注意： Only works if the lens is in perspective or orthographic projection mode.

另请参阅 Qt3D.Render::Camera::projectionType .

Qt3DRender::QCameraLens *QCamera:: lens () const

Returns the current lens.

注意： Getter function for property lens.

void QCamera:: pan ( float angle )

Adjusts the pan angle of the camera by angle in degrees.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: pan ( float angle , const QVector3D & axis )

Adjusts the pan angle of the camera by angle in degrees on a chosen axis .

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: panAboutViewCenter ( float angle )

Adjusts the camera pan about view center by angle in degrees.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: panAboutViewCenter ( float angle , const QVector3D & axis )

Adjusts the camera pan about view center by angle in degrees on axis .

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

QQuaternion QCamera:: panRotation ( float angle ) const

Returns the calculated pan rotation in relation to the angle in degrees taken in to adjust the camera's pan or left/right rotation on the Y axis.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: roll ( float angle )

Adjusts the camera roll by angle in degrees.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: rollAboutViewCenter ( float angle )

Adjusts the camera roll about view center by angle in degrees.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

QQuaternion QCamera:: rollRotation ( float angle ) const

Returns the calculated roll rotation in relation to the angle in degrees taken in to adjust the camera's roll or lean left/right rotation on the Z axis.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: rotate (const QQuaternion & q )

Rotates the camera with the use of a Quaternion in q .

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: rotateAboutViewCenter (const QQuaternion & q )

Rotates the camera about the view center with the use of a Quaternion in q .

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

QQuaternion QCamera:: rotation ( float angle , const QVector3D & axis ) const

Returns the calculated rotation in relation to the angle in degrees and chosen axis taken in.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: tilt ( float angle )

Adjusts the tilt angle of the camera by angle in degrees.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: tiltAboutViewCenter ( float angle )

Adjusts the camera tilt about view center by angle in degrees.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

QQuaternion QCamera:: tiltRotation ( float angle ) const

Returns the calculated tilt rotation in relation to the angle in degrees taken in to adjust the camera's tilt or up/down rotation on the X axis.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

Qt3DCore::QTransform *QCamera:: transform () const

Returns the camera's position via transform.

注意： Getter function for property transform.

void QCamera:: translate (const QVector3D & vLocal , Qt3DRender::QCamera::CameraTranslationOption option = TranslateViewCenter)

Translates the camera's position and its view vector by vLocal in local coordinates. The option allows for toggling whether the view center should be translated.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QCamera:: translateWorld (const QVector3D & vWorld , Qt3DRender::QCamera::CameraTranslationOption option = TranslateViewCenter)

Translates the camera's position and its view vector by vWorld in world coordinates. The option allows for toggling whether the view center should be translated.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .