QIRProximityReading

Since: Units}

#include <QtSensors/QIRProximityReading>

QtSensors

The QIRProximityReading class holds readings from the IR proximity sensor.

The IR (infra-red) proximity sensor detects proximity by beaming out infra-red light and detecting how much of the light returns.

The biggest limitation of this technology is that there is no reliable way to turn the reflectance values into distances unless both the item being detected and the ambient conditions are known.


Overview

Inheritance

QSensorReading
QIRProximityReading

Properties Index

qrealreflectance [read-only]
QtMobility::qtimestamptimestamp [read-only]Inherited

Public Functions Index

qrealreflectance () const
voidsetReflectance (qreal reflectance)
voidsetTimestamp (qtimestamp timestamp)Inherited
qtimestamptimestamp () const Inherited
QVariantvalue (int index) const Inherited
intvalueCount () const Inherited

Protected Functions Index

Only has inherited protected functions

virtual voidcopyValuesFrom (QSensorReading *other)Inherited
QScopedPointer< QSensorReadingPrivate > *d_ptr ()Inherited
QSensorReading (QObject *parent, QSensorReadingPrivate *d)Inherited

Properties

qreal reflectance[read-only]

Holds the reflectance value.

See also:

{QIRProximityReading Units}

QtMobility::qtimestamp timestampInherited[read-only]

the timestamp of the reading.

See also:

qtimestamp

Since:

1.0

,

1.0

Public Functions

qreal reflectance ()

void setReflectance (
  • qrealreflectance)

Sets the reflectance value to reflectance.

void setTimestamp (Inherited

Sets the timestamp of the reading.

Since:

1.0

qtimestamp timestamp ()Inherited

QVariant value (
  • intindex)
Inherited

Returns the value of the property at index.

Note that this function is slower than calling the data function directly.

Here is an example of getting a property via the different mechanisms available.

Accessing directly provides the best performance but requires compile-time knowledge of the data you are accessing.

QAccelerometerReading *reading = ...;
qreal x = reading->x();

You can also access a property by name. To do this you must call QObject::property().

qreal x = reading->property("x").value<qreal>();

Finally, you can access values via numeric index.

qreal x = reading->value(0).value<qreal>();

Note that value() can only access properties declared with Q_PROPERTY() in sub-classes of QSensorReading.

See also:

valueCount(), QObject::property()

Since:

1.0

int valueCount ()Inherited

Returns the number of extra properties that the reading has.

Note that this does not count properties declared in QSensorReading.

As an example, this returns 3 for QAccelerometerReading because there are 3 properties defined in that class.
Since:

1.0

Protected Functions

(Only has inherited protected functions)

virtual void copyValuesFrom (Inherited

QScopedPointer< QSensorReadingPrivate > * d_ptr ()Inherited

QSensorReading (
  • QObject *parent,
  • QSensorReadingPrivate *d )
Inherited

Last modified: 2014-06-24



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