Engine API Reference - v2.24.0-beta.28
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    Class IconGizmo

    Draws an icon at each attached entity with nothing else to see, such as a light, camera or sound. Entities with an enabled render, model, sprite or element component show none, and a disabled component still shows its icon. Clicking an icon fires IconGizmo.EVENT_ICONSELECT. The icons are IconGizmo#iconSize CSS pixels square.

    Use a layer that keeps the scene depth, so hidden icons use the occluded color.

    const layer = Gizmo.createLayer(app, 'Overlays', undefined, true);
    const gizmo = new IconGizmo(cameraComponent, layer);
    gizmo.attach([lightEntity, soundEntity]);
    gizmo.on('icon:select', entity => select(entity));

    Relevant Engine API examples:

    Hierarchy (View Summary)

    Index
    constructor
    _app _camera _coordSpace _device _handles _layer _mouseButtons _renderUpdate _scale intersectShapes nodes preventDefault root useLightColor
    _requiresNodes camera cameraDir coordSpace enabled facingDir iconSize layer mouseButtons size theme
    _createRay _getScreenScale _updatePosition _updateRotation _updateScale attach destroy detach fire getIconNode hasEvent off on once prerender setTheme update createLayer
    EVENT_ICONSELECT EVENT_NODESATTACH EVENT_NODESDETACH EVENT_POINTERDOWN EVENT_POINTERMOVE EVENT_POINTERUP EVENT_POSITIONUPDATE EVENT_RENDERUPDATE EVENT_ROTATIONUPDATE EVENT_SCALEUPDATE

    Protected_app

    _app: AppBase

    The app.

    Protected_camera

    _camera: CameraComponent

    The camera viewing the gizmo.

    Protected_coordSpace

    _coordSpace: GizmoSpace = 'world'

    The coordinate space.

    Protected_device

    _device: GraphicsDevice

    The graphics device.

    Protected_handles

    _handles: EventHandle[] = []

    The app event handles.

    Protected_layer

    _layer: Layer

    The render layer.

    Protected_mouseButtons

    _mouseButtons: [boolean, boolean, boolean] = ...

    The mouse buttons that interact.

    Protected_renderUpdate

    _renderUpdate: boolean = false

    Whether a render update is due.

    Protected_scale

    _scale: number = 1

    The gizmo scale.

    intersectShapes: Shape[] = []

    The shapes the gizmo picks.

    nodes: GraphNode[] = []

    The graph nodes attached to the gizmo.

    preventDefault: boolean = true

    Whether to call preventDefault on pointer events.

    root: Entity

    The root gizmo entity.

    useLightColor: boolean = false

    Whether to draw light icons in the light color. Defaults to false.

    Protected_requiresNodes

    • get _requiresNodes(): boolean
      Protected

      Gets whether the gizmo shows only with attached nodes. A getter, so a subclass's value applies while the base constructor runs.

      Returns boolean

    • get enabled(): boolean

      Gets the gizmo enabled state.

      Returns boolean

    • set enabled(state: boolean): void

      Sets the gizmo enabled state.

      Parameters

      • state: boolean

      Returns void

    • get mouseButtons(): [boolean, boolean, boolean]

      The mouse buttons that interact with the gizmo, by button index: 0 left, 1 middle, 2 right.

      Returns [boolean, boolean, boolean]

    • get size(): number

      Gets the gizmo size.

      Returns number

    • set size(value: number): void

      Sets the gizmo size. Defaults to 1.

      Parameters

      • value: number

      Returns void

    Protected_createRay

    Protected_getScreenScale

    Protected_updatePosition

    _updateRotation

    _updateScale

    • Detaches all graph nodes from the gizmo.

      Returns void

      const gizmo = new Gizmo(camera, layer);
      gizmo.attach([boxA, boxB]);
      gizmo.detach();

    • Fire an event, all additional arguments are passed on to the event listener.

      Parameters

      • name: string

        Name of event to fire.

      • Optionalarg1: any

        First argument that is passed to the event handler.

      • Optionalarg2: any

        Second argument that is passed to the event handler.

      • Optionalarg3: any

        Third argument that is passed to the event handler.

      • Optionalarg4: any

        Fourth argument that is passed to the event handler.

      • Optionalarg5: any

        Fifth argument that is passed to the event handler.

      • Optionalarg6: any

        Sixth argument that is passed to the event handler.

      • Optionalarg7: any

        Seventh argument that is passed to the event handler.

      • Optionalarg8: any

        Eighth argument that is passed to the event handler.

      Returns EventHandler

      Self for chaining.

      obj.fire('test', 'This is the message');

    • Test if there are any handlers bound to an event name.

      Parameters

      • name: string

        The name of the event to test.

      Returns boolean

      True if the object has handlers bound to the specified event name.

      obj.on('test', () => {}); // bind an event to 'test'
      obj.hasEvent('test'); // returns true
      obj.hasEvent('hello'); // returns false

    • Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event, if scope is not provided then all events with the callback will be unbound.

      Use this form to remove all listeners matching a name (and optionally callback/scope). To remove a single known subscription, prefer retaining the EventHandle returned by EventHandler#on / EventHandler#once and calling its EventHandle#off: it removes exactly that subscription and is faster (no scan of the callback list).

      Parameters

      • Optionalname: string

        Name of the event to unbind.

      • Optionalcallback: HandleEventCallback

        Function to be unbound.

      • Optionalscope: any

        Scope that was used as the this when the event is fired.

      Returns EventHandler

      Self for chaining.

      const handler = () => {};
      obj.on('test', handler);

      obj.off(); // Removes all events
      obj.off('test'); // Removes all events called 'test'
      obj.off('test', handler); // Removes all handler functions, called 'test'
      obj.off('test', handler, this); // Removes all handler functions, called 'test' with scope this

    • Attach an event handler to an event.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      An event handle. For later removal, prefer retaining this handle and calling its EventHandle#off over EventHandler#off with a name/callback: it removes exactly this subscription and is faster (no scan of the callback list).

      obj.on('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console

      // preferred removal: retain the handle and call off() on it
      const evt = obj.on('test', (a, b) => {
          console.log(a + b);
      });
      // some time later
      evt.off();

    • Attach an event handler to an event. The handler is removed before it is called, so it runs at most once, even if it fires the same event again or throws.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      An event handle. For removal before it fires, prefer retaining this handle and calling its EventHandle#off over EventHandler#off with a name/callback: it removes exactly this subscription and is faster (no scan of the callback list).

      obj.once('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console
      obj.fire('test', 1, 2); // not going to get handled

    • Updates the gizmo position, rotation, and scale.

      Returns void

      const gizmo = new Gizmo(camera, layer);
      gizmo.attach([boxA, boxB]);
      gizmo.update();

    • Creates a new gizmo layer and adds it to the scene.

      Parameters

      • app: AppBase

        The app.

      • OptionallayerName: string = 'Gizmo'

        The layer name. Defaults to 'Gizmo'.

      • OptionallayerIndex: number = app.scene.layers.layerList.length

        The layer index. Defaults to the end of the layer list.

      • Optionaldepth: boolean = false

        Whether the layer keeps the scene depth and sorts transparent mesh instances manually, as overlay gizmos need so occluded parts draw faint. Otherwise it clears depth and draws on top, as transform gizmos need. Defaults to false.

      Returns Layer

      The new layer.

      const layer = Gizmo.createLayer(app, 'Overlays', undefined, true);
    EVENT_ICONSELECT: string = 'icon:select'

    Fired when the icon of an entity is clicked.

    const gizmo = new pc.IconGizmo(camera, layer);
    gizmo.on('icon:select', (entity) => {
        console.log(`Clicked the icon of ${entity.name}`);
    });
    EVENT_NODESATTACH: string = 'nodes:attach'

    Fired when graph nodes are attached.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('nodes:attach', () => {
        console.log('Graph nodes attached');
    });
    EVENT_NODESDETACH: string = 'nodes:detach'

    Fired when graph nodes are detached.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('nodes:detach', () => {
        console.log('Graph nodes detached');
    });
    EVENT_POINTERDOWN: string = 'pointer:down'

    Fired when the pointer is down on the gizmo.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('pointer:down', (x, y, meshInstance) => {
        console.log(`Pointer was down on ${meshInstance.node.name} at ${x}, ${y}`);
    });
    EVENT_POINTERMOVE: string = 'pointer:move'

    Fired when the pointer is moving over the gizmo.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('pointer:move', (x, y, meshInstance) => {
        console.log(`Pointer was moving on ${meshInstance.node.name} at ${x}, ${y}`);
    });
    EVENT_POINTERUP: string = 'pointer:up'

    Fired when the pointer is up off the gizmo.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('pointer:up', (x, y, meshInstance) => {
        console.log(`Pointer was up on ${meshInstance.node.name} at ${x}, ${y}`);
    })
    EVENT_POSITIONUPDATE: string = 'position:update'

    Fired when the gizmo's position is updated.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('position:update', (position) => {
        console.log(`The gizmo's position was updated to ${position}`);
    })
    EVENT_RENDERUPDATE: string = 'render:update'

    Fired when the gizmo render has updated.

    const gizmo = new TransformGizmo(camera, layer);
    gizmo.on('render:update', () => {
        console.log('Gizmo render has been updated');
    });
    EVENT_ROTATIONUPDATE: string = 'rotation:update'

    Fired when the gizmo's rotation is updated.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('rotation:update', (rotation) => {
        console.log(`The gizmo's rotation was updated to ${rotation}`);
    });
    EVENT_SCALEUPDATE: string = 'scale:update'

    Fired when the gizmo's scale is updated.

    const gizmo = new Gizmo(camera, layer);
    gizmo.on('scale:update', (scale) => {
        console.log(`The gizmo's scale was updated to ${scale}`);
    });

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