QGeoManeuver Class

The QGeoManeuver class represents the information relevant to the point at which two QGeoRouteSegments meet. 更多...

头：	#include <QGeoManeuver>
qmake:	QT += location

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公共类型

enum	InstructionDirection { NoDirection, DirectionForward, DirectionBearRight, DirectionLightRight, DirectionRight, …, DirectionBearLeft }

特性

direction : const InstructionDirection distanceToNextInstruction : const qreal (since QtLocation 5.11) extendedAttributes : const QVariantMap instructionText : const QString

position : const QGeoCoordinate timeToNextInstruction : const int valid : const bool waypoint : const QGeoCoordinate

公共函数

	QGeoManeuver ()
	QGeoManeuver (const QGeoManeuver & other )
	~QGeoManeuver ()
QGeoManeuver::InstructionDirection	direction () const
qreal	distanceToNextInstruction () const
QVariantMap	extendedAttributes () const
QString	instructionText () const
bool	isValid () const
QGeoCoordinate	position () const
int	timeToNextInstruction () const
QGeoCoordinate	waypoint () const
QGeoManeuver &	operator= (const QGeoManeuver & other )

相关非成员

bool	operator!= (const QGeoManeuver & lhs , const QGeoManeuver & rhs )
bool	operator== (const QGeoManeuver & lhs , const QGeoManeuver & rhs )

详细描述

QGeoRouteSegment instances can be thought of as edges on a routing graph, with QGeoManeuver instances as optional labels attached to the vertices of the graph.

The most interesting information help in a QGeoManeuver instance is normally the textual navigation to provide and the position at which to provide it, accessible by instructionText () 和 position () 分别。

It is also possible to determine if a routing waypoint has been passed by checking if waypoint () returns a valid QGeoCoordinate .

成员类型文档编制

enum QGeoManeuver:: InstructionDirection

Describes the change in direction associated with the instruction text that is associated with a QGeoManaeuver.

常量	值	描述
QGeoManeuver::NoDirection	0	There is no direction associated with the instruction text.
QGeoManeuver::DirectionForward	1	The instruction indicates that the direction of travel does not need to change.
QGeoManeuver::DirectionBearRight	2	The instruction indicates that the direction of travel should bear to the right.
QGeoManeuver::DirectionLightRight	3	The instruction indicates that a light turn to the right is required.
QGeoManeuver::DirectionRight	4	The instruction indicates that a turn to the right is required.
QGeoManeuver::DirectionHardRight	5	The instruction indicates that a hard turn to the right is required.
QGeoManeuver::DirectionUTurnRight	6	The instruction indicates that a u-turn to the right is required.
QGeoManeuver::DirectionUTurnLeft	7	The instruction indicates that a u-turn to the left is required.
QGeoManeuver::DirectionHardLeft	8	The instruction indicates that a hard turn to the left is required.
QGeoManeuver::DirectionLeft	9	The instruction indicates that a turn to the left is required.
QGeoManeuver::DirectionLightLeft	10	The instruction indicates that a light turn to the left is required.
QGeoManeuver::DirectionBearLeft	11	The instruction indicates that the direction of travel should bear to the left.

特性文档编制

[read-only] direction : const InstructionDirection

This property holds the direction associated with the associated instruction.

访问函数：

QGeoManeuver::InstructionDirection

direction () const

[read-only] distanceToNextInstruction : const qreal

This property holds the distance, in meters, between the point at which this instruction was issued, and the point at which the next instruction should be issued.

访问函数：

qreal

distanceToNextInstruction () const

[read-only, since QtLocation 5.11] extendedAttributes : const QVariantMap

This property holds the extended attributes associated with this maneuver.

This property was introduced in QtLocation 5.11.

访问函数：

QVariantMap

extendedAttributes () const

[read-only] instructionText : const QString

This property holds the textual navigation instructions.

访问函数：

QString

instructionText () const

[read-only] position : const QGeoCoordinate

This property holds the position where instructionText should be displayed.

访问函数：

QGeoCoordinate

位置 () const

[read-only] timeToNextInstruction : const int

This property holds the estimated time, in seconds, that it will take to travel from the point at which the associated instruction was issued to the point at which the next instruction should be issued.

访问函数：

int	timeToNextInstruction () const

[read-only] valid : const bool

This property holds whether this maneuver is valid or not.

Invalid maneuvers are used when there is no information that needs to be attached to the endpoint of a QGeoRouteSegment 实例。

访问函数：

bool	isValid () const

[read-only] waypoint : const QGeoCoordinate

This property holds the waypoint associated with this maneuver.

If there is not waypoint associated with this maneuver, then this property holds an invalid QGeoCoordinate .

访问函数：

QGeoCoordinate

waypoint () const

成员函数文档编制

QGeoManeuver:: QGeoManeuver ()

Constructs a invalid maneuver object.

The maneuver will remain invalid until one of setPosition(), setInstructionText(), setDirection(), setTimeToNextInstruction(), setDistanceToNextInstruction() or setWaypoint() is called.

[noexcept] QGeoManeuver:: QGeoManeuver (const QGeoManeuver & other )

Constructs a maneuver object from the contents of other .

[noexcept] QGeoManeuver:: ~QGeoManeuver ()

Destroys this maneuver object.

QGeoManeuver &QGeoManeuver:: operator= (const QGeoManeuver & other )

赋值 other to this maneuver object and then returns a reference to this maneuver object.

相关非成员

[noexcept] bool operator!= (const QGeoManeuver & lhs , const QGeoManeuver & rhs )

Returns whether the lhs maneuver is not equal to rhs .

[noexcept] bool operator== (const QGeoManeuver & lhs , const QGeoManeuver & rhs )

Returns whether the lhs maneuver is equal to rhs .

内容

• 公共类型

• 特性

• 公共函数

• 相关非成员

• 详细描述