ViroARImageMarker is a component that attempts to find the given target in the user's view allowing the developer to place objects with respect to the image or to determine their location relative to the image target.
Example use:
// Register the target
ViroARTrackingTargets.createTargets({
"targetOne" : {
source : require('./res/targetOne.jpg'),
orientation : "Up",
physicalWidth : 0.1 // real world width in meters
},
});
<ViroARImageMarker target={"targetOne"} >
<ViroBox position={[0, .25, 0]} scale={[.5, .5, .5]} />
</ViroARImageMarker>
Props
Required Props
PropKey | PropType |
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target | PropTypes.string Name of the image target created with ViroARTrackingTargets. |
Optional Props
PropKey | PropType | ||||||||
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dragPlane | PropTypes.shape({ When a drag type of "FixedToPlane" is given, dragging is limited to a user defined plane. The dragging behavior is then configured by this property (specified by a point on the plane and its normal vector). You can also limit the maximum distance the dragged object is allowed to travel away from the camera/controller (useful for situations where the user can drag an object towards infinity). | ||||||||
dragType | PropTypes.oneOf(["FixedDistance", "FixedToWorld"]) Determines the behavior of drag if onDrag is specified.
The default value is "FixedDistance". | ||||||||
ignoreEventHandling | PropTypes.bool When set to true, this control will ignore events and not prevent controls behind it from receiving event callbacks. The default value is false. | ||||||||
onAnchorFound | PropTypes.func Called when this component is anchored to a plane that is at least
| ||||||||
onAnchorRemoved | PropTypes.func Called when this component is detached from a plane and is no longer visible. | ||||||||
onAnchorUpdated | PropTypes.func Called when the anchor is update. For image markers, there's additional information provided in the returned anchor.
| ||||||||
onClick | PropTypes.func Called when a marker has been clicked. Example code:
The position parameter represents the position in world coordinates on the marker where the click occurred. For the mapping of sources to controller inputs, see the Events section. | ||||||||
onClickState | PropTypes.func Called for each click state an object goes through as it is clicked. Supported click states and their values are the following:
Example code:
The position parameter represents the position in world coordinates on the marker where the click occurred. For the mapping of sources to controller inputs, see the Events section. | ||||||||
onCollision | React.PropTypes.func Called when this component's physics body collides with another component's physics body. Also invoked by ViroScene/ViroARScene's
| ||||||||
onDrag | PropTypes.func Called when the view is currently being dragged. The dragToPos parameter provides the current 3D location of the dragged object. Example code:
For the mapping of sources to controller inputs, see the Events section. Unsupported VR Platforms: Cardboard iOS | ||||||||
onFuse | PropTypes.oneOfType
As shown above, onFuse takes one of the types - either a callback, or a dictionary with a callback and duration. It is called after the user hovers onto and remains hovered on the control for a certain duration of time, as indicated in timeToFuse that represents the duration of time in milliseconds. While hovering, the reticle will display a count down animation while fusing towards timeToFuse. Note that timeToFuse defaults to 2000ms. For example:
For the mapping of sources to controller inputs, see the Events section. | ||||||||
onHover | PropTypes.func For instance, let's say you have a that contains a few buttons and text. If none of them have a onHover handler defined, and they get hovered upon, then this function will invoke, effectively capturing the onHover event from it's children. For example:
The position parameter represents the position in world coordinates on the marker where the click occurred. For the mapping of sources to controller inputs, see the Events section. | ||||||||
onPinch | PropTypes.func Called when the user performs a pinch gesture on the control. When the pinch starts, the scale factor is set to 1 is relative to the points of the two touch points. For example:
pinchState can be the following values:
This event is only available in AR. | ||||||||
onRotate | PropTypes.func Called when the user performs a rotation touch gesture on the control. Rotation factor is returned in degrees. When setting rotation, the rotation should be relative to it's current rotation, not set to the absolute value of the given rotationFactor. For example:
rotationState can be the following values:
This event is only available in AR. | ||||||||
onScroll | PropTypes.func Called when the user performs a scroll action, while hovering on the control. For example:
For the mapping of sources to controller inputs, see the Events section. Unsupported VR Platforms: Cardboard(Android and iOS) | ||||||||
onSwipe | PropTypes.func Called when the user performs a swipe gesture on the physical controller, while hovering on this control. For example:
For the mapping of sources to controller inputs, see the Events section. Unsupported VR Platforms: Cardboard(Android and iOS) | ||||||||
onTouch | PropTypes.func Called when the user performs a touch action, while hovering on the control. Provides the touch state type, and the x/y coordinate at which this touch event has occurred.
For example:
For the mapping of sources to controller inputs, see the Events section. Unsupported VR Platforms: Cardboard(Android and iOS). | ||||||||
opacity | PropTypes.number A number from 0 to 1 that specifies the opacity of the container. A value of 1 translates into a fully opaque node while 0 represents full transparency. | ||||||||
pauseUpdates | PropTypes.boolean True/False to stop the automatic positioning/rotation of children components of a | ||||||||
viroTag | PropTypes.string A tag given to other components when their physics body collides with this component's physics body. Refer to physics for more information. | ||||||||
visible | PropTypes.bool False if the container should be hidden. By default the container is visible and this value is true. | ||||||||
renderingOrder | PropTypes.number This determines the order in which this Node is rendered relative to other Nodes. Nodes with greater rendering orders are rendered last. The default rendering order is zero. For example, setting a Node's rendering order to -1 will cause the Node to be rendered before all Nodes with rendering orders greater than or equal to 0. |
Methods
setNativeProps(nativeProps: object) | ||||
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A wrapper function around the native component's setNativeProps which allow users to set values on the native component without changing state/setting props and re-rendering. Refer to the React Native documentation on Direct Manipulation for more information.
For example, setting position natively would look like this:
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Updated about a year ago