An interface for focus related camera settings. 更多...
import 语句: | import QtMultimedia 5.15 |
This type allows control over manual and automatic focus settings, including information about any parts of the camera frame that are selected for autofocusing.
It should not be constructed separately, instead the
focus
property of a
Camera
should be used.
Item { width: 640 height: 360 Camera { id: camera focus { focusMode: Camera.FocusMacro focusPointMode: Camera.FocusPointCustom customFocusPoint: Qt.point(0.2, 0.2) // Focus relative to top-left corner } } VideoOutput { source: camera anchors.fill: parent } }
customFocusPoint : point |
This property holds the position of custom focus point, in relative frame coordinates: QPointF (0,0) points to the left top frame point, QPointF (0.5,0.5) points to the frame center.
Custom focus point is used only in FocusPointCustom focus mode.
focusMode : enumeration |
This property holds the current camera focus mode, which can be one of the following values:
值 | 描述 |
---|---|
FocusManual | Manual or fixed focus mode. |
FocusHyperfocal | Focus to hyperfocal distance, with the maximum depth of field achieved. All objects at distances from half of this distance out to infinity will be acceptably sharp. |
FocusInfinity | Focus strictly to infinity. |
FocusAuto | One-shot auto focus mode. |
FocusContinuous | Continuous auto focus mode. |
FocusMacro | One shot auto focus to objects close to camera. |
It's possible to combine multiple Camera::FocusMode values, for example Camera.FocusMacro + Camera.FocusContinuous.
In automatic focusing modes, the focusPointMode 特性和 focusZones property provide information and control over how automatic focusing is performed.
focusPointMode : enumeration |
This property holds the current camera focus point mode. It is used in automatic focusing modes to determine what to focus on. If the current focus point mode is
Camera.FocusPointCustom
,
customFocusPoint
property allows you to specify which part of the frame to focus on.
The property can take one of the following values:
值 | 描述 |
---|---|
FocusPointAuto | Automatically select one or multiple focus points. |
FocusPointCenter | Focus to the frame center. |
FocusPointFaceDetection | Focus on faces in the frame. |
FocusPointCustom | Focus to the custom point, defined by the customFocusPoint 特性。 |
focusZones : list < focusZone > |
This property holds the list of current camera focus zones, each including
area
specified in the same coordinates as
customFocusPoint
, and zone
status
as one of the following values:
值 | 描述 |
---|---|
Camera.FocusAreaUnused | This focus point area is currently unused in autofocusing. |
Camera.FocusAreaSelected | This focus point area is used in autofocusing, but is not in focus. |
Camera.FocusAreaFocused | This focus point is used in autofocusing, and is in focus. |
VideoOutput { id: viewfinder source: camera //display focus areas on camera viewfinder: Repeater { model: camera.focus.focusZones Rectangle { border { width: 2 color: status == Camera.FocusAreaFocused ? "green" : "white" } color: "transparent" // Map from the relative, normalized frame coordinates property variant mappedRect: viewfinder.mapNormalizedRectToItem(area); x: mappedRect.x y: mappedRect.y width: mappedRect.width height: mappedRect.height } } }
supportedFocusModes : list < FocusMode > |
This property holds the supported focus modes of the camera.
该特性在 Qt 5.11 引入。
另请参阅 focusMode .
supportedFocusPointModes : list < enumeration > |
This property holds the supported focus point modes of the camera.
该特性在 Qt 5.10 引入。
另请参阅 focusPointMode .