Guides

ViroImage

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A component used to display 2D images.

Example use:
<ViroImage
    height={2}
    width={2}
    placeholderSource={require("./res/local_spinner.jpg")}
    source={{ uri: "https://my_s3_image.jpg" }}
/>

Props

Required Props

sourcePropTypes.oneOfType( [PropTypes.shape( {uri: PropTypes.string} ), PropTypes.number] )The image source, a remote URL or a local file resource. PNG and JPG images accepted.To invoke with remote url: {uri:"http://example.org/myimage.png"}To invoke with local source:require('image.html');

animation

TypeDescription
PropTypes.shape({ name: PropTypes.string, delay: PropTypes.number, loop: PropTypes.bool, onStart: PropTypes.func, onFinish: PropTypes.func, run: PropTypes.bool, })A collection of parameters that determine if this component should animate. For more information on animated components please see our Animation Guide.

dragPlane

TypeDescription
PropTypes.shape({ planePoint:PropTypes.arrayOf(PropTypes.number), planeNormal:PropTypes.arrayOf(PropTypes.number), maxDistance:PropTypes.number})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

TypeDescription
PropTypes.oneOf(["FixedDistance", "FixedToWorld"])Determines the behavior of drag if onDrag is specified.|Value|Description||:------|:----------:||FixedDistance| Dragging is limited to a fixed radius around the user, dragged from the point at which the user has grabbed the geometry containing this draggable node||FixedDistanceOrigin| Dragging is limited to a fixed radius around the user, dragged from the point of this node's position in world space.||FixedToWorld| Dragging is based on intersection with real world objects. Available only in AR ||FixedToPlane| Dragging is limited to a fixed plane around the user. The configuration of this plane is defined by the dragPlane property.|The default value is "FixedDistance".

format

TypeDescription
PropTypes.oneOf(['RGBA8', 'RGBA4', 'RGB565'])Image texture formats for storage on the GPU.|Format|Description||:------|:----------:||RGBA8| Each pixel is described with 32-bits, using eight bits per channel||RGBA4| Each pixel is described with 16 bits, using four bits per channel||RGB565| Formats the picture into 16 bit color values without alpha|

height

TypeDescription
PropTypes.numberThe height of the image in 3D space. Default value is 1.

highAccuracyEvents

TypeDescription
PropTypes.boolTrue if events should use the geometry of the object to determine if the user is interacting with this object. If false, the object's axis-aligned bounding box will be used instead. Enabling this is more accurate but takes more processing power, so it is set to false by default.

ignoreEventHandling

TypeDescription
PropTypes.boolWhen set to true, this control will ignore events and not prevent controls behind it from receiving event callbacks.The default value is false.

imageClipMode

TypeDescription
PropTypes.oneOf(['None', 'ClipToBounds'])Defaults to clipToBounds. If ClipToBounds is set, image is cropped if it overshoots with ScaleToFill. Setting to None does not crop image if it overshoots bounds.

lightReceivingBitMask

TypeDescription
PropTypes.numberA bit mask that is bitwise and-ed (&) with each light's influenceBitMask. If the result is > 0, then the light will illuminate this object. For more information please see the Lighting and Materials Guide.

materials

TypeDescription
PropTypes.oneOfType([PropTypes.arrayOf(PropTypes.string),PropTypes.string])An array of strings that each represent a material that was created via ViroMaterials.createMaterials(). ViroImage takes 1 material. The diffuseTexture of the material will be the image shown unless a source prop is specified. The other material properties will preserve as the source prop changes.

mipmap

TypeDescription
PropTypes.boolIf true, we dynamically generate mipmaps for the source of this given image.

onClick

TypeDescription
React.PropTypes.funcCalled when an object has been clicked.Example code: _onClick(position, source) { // user has clicked the object}The position parameter represents the position in world coordinates on the object where the click occurred. For the mapping of sources to controller inputs, see the Events section.

onClickState

TypeDescription
React.PropTypes.funcCalled for each click state an object goes through as it is clicked. Supported click states and their values are the following:|State Value|Description||:------|:----------:||1| Click Down: Triggered when the user has performed a click down action while hovering on this control.||2| Click Up: Triggered when the user has performed a click up action while hovering on this control.||3| Clicked: Triggered when the user has performed both a click down and click up action on this control sequentially, thereby having "Clicked" the object.|Example code: _onClickState(stateValue, position, source) { if(stateValue == 1) { // Click Down } else if(stateValue == 2) { // Click Up } else if(stateValue == 3) { // Clicked }}For the mapping of sources to controller inputs, see the Events section.

onCollision

TypeDescription
React.PropTypes.funcCalled when this component's physics body collides with another component's physics body. Also invoked by ViroScene/ViroARScene's findCollisions... functions.|Return Value | Description ||---|---||viroTag | the given viroTag (string) of the collided component ||collidedPoint | an array of numbers representing the position, in world coordinates, of the point of collision||collidedNormal | an array representing the normal of the collision in world coordinates. |

onDrag

TypeDescription
React.PropTypes.funcCalled when the view is currently being dragged. The dragToPos parameter provides the current 3D location of the dragged object. Example code: _onDrag(dragToPos, source) { // dragtoPos[0]: x position // dragtoPos[1]: y position // dragtoPos[2]: z position} For the mapping of sources to controller inputs, see the Events section. Unsupported VR Platforms: Cardboard iOS

onFuse

TypeDescription
PropTypes.oneOfType PropTypes.oneOfType([ React.PropTypes.shape({ callback: React.PropTypes.func.isRequired, timeToFuse: PropTypes.number }), React.PropTypes.func,]) 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: _onFuse(source){ // User has hovered over object for timeToFuse milliseconds}For the mapping of sources to controller inputs, see the Events section.

onHover

TypeDescription
React.PropTypes.funcCalled when the user hovers on or off the control.For example: _onHover(isHovering, position, source) { if(isHovering) { // user is hovering over the box } else { // user is no longer hovering over the box }}The position parameter represents the position in world coordinates on the object where the click occurred. For the mapping of sources to controller inputs, see the Events section.

onError

TypeDescription
React.PropTypes.funcCallback invoked when the Image fails to load. The error message is contained in event.nativeEvent.error

onLoadStart

TypeDescription
React.PropTypes.funcCallback triggered when we are processing the image to be displayed as specified by the source prop.

onLoadEnd

TypeDescription
React.PropTypes.funcCallback triggered when we have finished loading the image to be displayed. Whether or not the image was loaded and displayed properly will be indicated by the parameter "success". For example: _onLoadEnd(event:Event) { // Indication of asset loading success if(event.nativeEvent.success) { //our image successfully loaded! } }

onPinch

TypeDescription
React.PropTypes.funcCalled 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: _onPinch(pinchState, scaleFactor, source) { if(pinchState == 3) { // update scale of obj by multiplying by scaleFactor when pinch ends. return; } //set scale using native props to reflect pinch. }pinchState can be the following values:|State Value|Description||:------|:----------:||1| Pinch Start: Triggered when the user has started a pinch gesture.||2| Pinch Move: Triggered when the user has adjusted the pinch, moving both fingers. ||3| Pinch End: When the user has finishes the pinch gesture and released both touch points. |This event is only available in AR.

onRotate

TypeDescription
React.PropTypes.funcCalled 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: _onRotate(rotateState, rotationFactor, source) { if (rotateState == 3) { //set to current rotation - rotationFactor. return; } //update rotation using setNativeProps },rotateState can be the following values:|State Value|Description||:------|:----------:||1| Rotation Start: Triggered when the user has started a rotation gesture.||2| Rotation Move: Triggered when the user has adjusted the rotation, moving both fingers. ||3| Rotation End: When the user has finishes the rotation gesture and released both touch points. |This event is only available in AR.

onScroll

TypeDescription
React.PropTypes.funcCalled when the user performs a scroll action, while hovering on the control.For example: _onScroll(scrollPos, source) { // scrollPos[0]: x scroll position from 0.0 to 1.0. // scrollPos[1]: y scroll position from 0.0 to 1.0.}For the mapping of sources to controller inputs, see the Events section.Unsupported VR Platforms: Cardboard(Android and iOS)

onSwipe

TypeDescription
React.PropTypes.funcCalled when the user performs a swipe gesture on the physical controller, while hovering on this control. For example: _onSwipe(state, source) { if(state == 1) { // Swiped up } else if(state == 2) { // Swiped down } else if(state == 3) { // Swiped left } else if(state == 4) { // Swiped right }}For the mapping of sources to controller inputs, see the Events section.Unsupported VR Platforms: Cardboard(Android and iOS)

onTouch

TypeDescription
React.PropTypes.funcCalled 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.|State Value|Description||:------|:----------:||1| Touch Down: Triggered when the user makes physical contact with the touch pad on the controller. ||2| Touch Down Move: Called when the user moves around the touch pad immediately after having performed a Touch Down action. ||3| Touch Up: Triggered after the user is no longer in physical contact with the touch pad after a Touch Down action. |For example: _onTouch(state, touchPos, source) { var touchX = touchPos[0]; var touchY = touchPos[1]; if(state == 1) { // Touch Down } else if(state == 2) { // Touch Down Move } else if(state == 3) { // Touch Up }}For the mapping of sources to controller inputs, see the Events section.Unsupported VR Platforms: Cardboard(Android and iOS).

onTransformUpdate

TypeDescription
PropTypes.funcA function that is invoked when the component moves and provides an array of numbers representing the component's position in world coordinates.

opacity

TypeDescription
PropTypes.numberA number from 0 to 1 that specifies the opacity of the object. A value of 1 translates into a fully opaque object while 0 represents full transparency.

placeholderSource

TypeDescription
PropTypes.oneOfType([ PropTypes.shape({ uri: PropTypes.string }), PropTypes.number ])A static placeholder image that is shown until the source image is loaded it. It not specified, nothing will show until the source image is finished loading. PNG and JPG images accepted.Example:To invoke with local source:require('image_placeholder.html');

position

TypeDescription
PropTypes.arrayOf(PropTypes.number)Cartesian position in 3D space, stored as [x, y, z].

physicsBody

TypeDescription
PropTypes.shape({..physics.api..}),Creates and binds a physics body that is configured with the provided collection of physics properties associated with this control.For more information on physics components, please see the physics.api.

resizeMode

TypeDescription
PropTypes.oneOf(['ScaleToFill','ScaleToFit','StretchToFill']),If not specified, the default value is stretchToFill.|Value|Description||:------|:----------:||scaleToFill | Scale the image up to fit the component width or height. Aspect ratio is preserved. ||scaleToFit | Scale the image down to fit the component width or height. Aspect ratio is preserved. ||stretchToFill | Stretch the image to fit on the entire surface of the ViroImage component. Aspect ratio is not preserved.|

rotation

TypeDescription
PropTypes.arrayOf(PropTypes.number)The rotation of the transform in world space stored as Euler angles [x, y, z]. Units for each angle are specified in degrees.

rotationPivot

TypeDescription
PropTypes.arrayOf(PropTypes.number) Cartesian position in [x,y,z] about which rotation is applied relative to the component's position.

scale

TypeDescription
PropTypes.arrayOf(PropTypes.number)The scale of the image in 3D space, specified as [x,y,z]. A scale of 1 represents the current size of the image. A scale value of < 1 will make the image proportionally smaller while a value >1 will make the image proportionally bigger along the specified axis.

scalePivot

TypeDescription
PropTypes.arrayOf(PropTypes.number) Cartesian position in [x,y,z] from which scale is applied relative to the component's position.

shadowCastingBitMask

TypeDescription
PropTypes.numberA bit mask that is bitwise and-ed (&) with each light's influenceBitMask. If the result is > 0, then this object will cast shadows from the light. For more information please see the Lighting and Materials Guide.

stereoMode

TypeDescription
PropTypes.oneOf(['leftRight', 'rightLeft', 'topBottom', 'bottomTop', 'none'])Specifies the alignment mode of the provided stereo image in source. The image will be rendered in the given order, the first being the left eye, the next the right eye.For example, leftRight will render the left half of the image to the left eye, and the right half of the image to the right eye. Similarly, topBottom will render the top half of the image to the left eye, and the bottom half of the image to the right eye. Defaults to none.Note: There's a known issue with stereoscopic images of the format RGB565 (the fix is on the roadmap).

style

TypeDescription
stylePropTypeStyle properties determine the position and scale of the component within a ViroFlexView. Please see the UI Controls & Flexbox guide and Styles reference for more information.

transformBehaviors

TypeDescription
PropTypes.oneOfType([PropTypes.arrayOf(PropTypes.string),PropTypes.string])An array of transform constraints that affect the transform of the image. For example, putting the value "billboard" will ensure the image is facing the user as the user rotates their head on any axis. This is useful for having the image always face the user on a particular axis, which especially useful for tappable icons.Allowed values(values are case sensitive):|Value|Description||:------|:----------:||billboard| Billboard object on x,y,z axis ||billboardX| Billboard object on the x axis||billboardY| Billboard object on the y axis|

viroTag

TypeDescription
PropTypes.stringA tag given to other components when their physics body collides with this component's physics body. Refer to physics for more information.

visible

TypeDescription
PropTypes.boolFalse if the image should be hidden. By default the button is visible and this value is true.

width

TypeDescription
PropTypes.numberThe width of the image in 3D space. Default value is 1.

renderingOrder

TypeDescription
PropTypes.numberThis 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

async getBoundingBoxAsync()
Async function that returns the component's bounding box in world coordinates.Returns a Promise that will be completed with the following object:{ `boundingBox` : { `minX` : number, `maxX` : number, `minY` : number, `maxY` : number, `minZ` : number, `maxZ` : number }}
async getTransformAsync()
Async function that returns the component's transform (position, scale and rotation).|Return value | Description||---|---|| transform | an object that contains "position", "scale" and "rotation" keys which point to number arrays |
applyImpulse(force: arrayOf(number), position: arrayOf(number))
A function used with physics to apply an impulse (instantaneous) force to an object with a physics body.|Parameter|Description||---|---||force |an array of magnitudes to be applied as force (N) to the object in the positive x, y and z directions|
applyTorqueImpulse(torque: arrayOf(number), position: arrayOf(number))
A function used with physics to apply an impulse (instantaneous) torque to an object with a physics body.|Parameter|Description||---|---||torque |an array of magnitudes to be applied as a torque (N * m) to the object in the positive x, y and z directions at the given position||position | a position relative to the object from which to apply the given torque|
setVelocity(velocity: arrayOf(number))
A function used with physics to set the velocity of an object with a physics body.|Parameter|Description||---|---||velocity | an array of numbers corresponding to x, y, and z velocity |

setNativeProps(nativeProps)

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.

ParameterTypeDescription
nativePropsobjectan object where the keys are the properties to set and the values are the values to set
componentRef.setNativeProps({ position: [0, 0, -1] });

Static Methods

evictFromCache(source)
source - PropTypes.oneOfType( [PropTypes.shape( {uri: PropTypes.string} ), PropTypes.number] )The given source will be purged from the memory and local storage cache of the device. On Android, Viro, like React-Native, uses the Fresco image library to load and cache images and this is required if the given source reference (uri, etc) is the same, but the image data changes. Android Only

Updated over 2 years ago