QtMultimedia.CameraFocus

An interface for focus related camera settings. More...

Properties

• customFocusPoint : point
• focusMode : enumeration
• focusPointMode : enumeration
• focusZones : list<focusZone>

Methods

• bool isFocusModeSupported(mode)
• bool isFocusPointModeSupported(mode)

Detailed Description

CameraFocus is part of the QtMultimedia 5.0 module.

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.

import QtQuick 2.0
import QtMultimedia 5.0
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
}
}

Property Documentation

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.

This property holds the current camera focus mode, which can be one of the following values:

It's possible to combine multiple Camera::FocusMode values, for example Camera.FocusMacro + Camera.FocusContinuous.

In automatic focusing modes, the focusPointMode property and focusZones property provide information and control over how automatic focusing is performed.

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, the customFocusPoint property allows you to specify which part of the frame to focus on.

The property can take one of the following values:

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:

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
}
}
}

Method Documentation

Returns true if the supplied mode is a supported focus mode, and false otherwise.

Returns true if the supplied mode is a supported focus point mode, and false otherwise.