QIRProximityReading
#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.
Inheritance
| QSensorReading | ||
| QIRProximityReading | ||
Properties Index
| qreal | reflectance [read-only] |
| QtMobility::qtimestamp | timestamp [read-only] |
Public Functions Index
| QIRProximityReading (QObject *parent=0) | |
| virtual | ~QIRProximityReading () |
| virtual void | copyValuesFrom (QSensorReading *other) |
| qreal | reflectance () const |
| void | setReflectance (qreal reflectance) |
| void | setTimestamp (qtimestamp timestamp) |
| qtimestamp | timestamp () const |
| QVariant | value (int index) const |
| int | valueCount () const |
Protected Functions Index
Only has inherited protected functions
| QScopedPointer< QSensorReadingPrivate > * | d_ptr () |
| QSensorReading (QObject *parent, QSensorReadingPrivate *d) |
Properties
qreal
Holds the reflectance value.
The reflectance is a percentage (from 0 to 100) indicating how much of the transmitted infra-red light was returned.
{QIRProximityReading Units}
QtMobility::qtimestamp timestamp[read-only]
the timestamp of the reading.
Returns the timestamp of the reading.
1.0
,1.0
Public Functions
virtual
Destructor.
virtual void
qreal
void
Sets the reflectance value to reflectance.
void
Sets the timestamp of the reading.
1.0
QVariant
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.
valueCount(), QObject::property()
1.0
int
Returns the number of extra properties that the reading has.
Note that this does not count properties declared in QSensorReading.
1.0
Protected Functions
(Only has inherited protected functions)
QScopedPointer< QSensorReadingPrivate > *
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