QCameraFocusZone Class▲
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Header: QCameraFocusZone
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qmake: QT += multimedia
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Group: QCameraFocusZone is part of multimedia, multimedia_camera
Detailed Description▲
For cameras that support autofocusing, in order for a camera to autofocus on part of a sensor frame, it considers different zones within the frame. Which zones to use, and where the zones are located vary between different cameras.
This class exposes what zones are used by a particular camera, and a list of the zones can be retrieved by a QCameraFocus instance.
You can use this information to present visual feedback - for example, drawing rectangles around areas of the camera frame that are in focus, or changing the color of a zone as it comes into focus.
focus->setFocusPointMode(QCameraFocus::FocusPointAuto);
QList<QCameraFocusZone> zones = focus->focusZones();
foreach (QCameraFocusZone zone, zones) {
if (zone.status() == QCameraFocusZone::Focused) {
// Draw a green box at zone.area()
} else if (zone.status() == QCameraFocusZone::Selected) {
// This area is selected for autofocusing, but is not in focus
// Draw a yellow box at zone.area()
}
}See Also▲
See also QCameraFocus
Member Type Documentation▲
enum QCameraFocusZone::FocusZoneStatus▲
|
Constant |
Value |
Description |
|---|---|---|
|
QCameraFocusZone::Invalid |
0 |
This zone is not valid |
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QCameraFocusZone::Unused |
1 |
This zone may be used for autofocusing, but is not currently. |
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QCameraFocusZone::Selected |
2 |
This zone is currently being used for autofocusing, but is not in focus. |
|
QCameraFocusZone::Focused |
3 |
This zone is being used for autofocusing and is currently in focus. |
Member Function Documentation▲
QCameraFocusZone::QCameraFocusZone(const QCameraFocusZone &other)▲
Creates a new QCameraFocusZone as a copy of other.
QCameraFocusZone::~QCameraFocusZone()▲
Destroys this QCameraFocusZone.
QRectF QCameraFocusZone::area() const▲
Returns the area of the camera frame that this focus zone encompasses.
Coordinates are in frame relative coordinates - QPointF(0,0) is the top left of the frame, and QPointF(1,1) is the bottom right.
bool QCameraFocusZone::isValid() const▲
Returns true if this focus zone has a valid area and status.
QCameraFocusZone::FocusZoneStatus QCameraFocusZone::status() const▲
Returns the current status of this focus zone.
bool QCameraFocusZone::operator!=(const QCameraFocusZone &other) const▲
Returns true if this focus zone is not the same as other.
QCameraFocusZone &QCameraFocusZone::operator=(const QCameraFocusZone &other)▲
Assigns other to this QCameraFocusZone.
bool QCameraFocusZone::operator==(const QCameraFocusZone &other) const▲
Returns true if this focus zone is the same as other.