Engine API Reference - v2.11.0
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    Class RotateGizmo

    The RotateGizmo provides interactive 3D manipulation handles for rotating/reorienting Entitys in a Scene. It creates a visual widget with a draggable ring for each axis of rotation, plus a fourth ring for rotation in the camera's view plane, allowing precise control over object orientation through direct manipulation. The gizmo's visual appearance can be customized away from the defaults as required.

    Note that the gizmo can be driven by both mouse+keyboard and touch input.

    // Create a layer for rendering all gizmos
    const gizmoLayer = pc.Gizmo.createLayer(app);

    // Create a rotate gizmo
    const gizmo = new pc.RotateGizmo(cameraComponent, gizmoLayer);

    // Create an entity to attach the gizmo to
    const entity = new pc.Entity();
    entity.addComponent('render', {
        type: 'box'
    });
    app.root.addChild(entity);

    // Attach the gizmo to the entity
    gizmo.attach([entity]);

    Relevant Engine API examples:

    Hierarchy (View Summary)

    Index

    Constructors

    constructor

    Properties

    _app _camera _coordSpace _device _handles _layer _rootStartPos _rootStartRot _scale _selectedAxis _selectedIsPlane _selectionStartPoint _shapes _theme dragMode intersectShapes nodes orbitRotation root snapIncrement

    Accessors

    _dragging angleGuideThickness camera cameraDir coordSpace enabled faceRingRadius faceTubeRadius facingDir layer ringTolerance size snap theme xyzRingRadius xyzTubeRadius

    Methods

    _calculateAngle _createPlane _createRay _createTransform _dirFromAxis _drawGuideLines _drawSpanLine _projectToAxis _screenToPoint _updatePosition _updateRotation _updateScale attach destroy detach enableShape fire hasEvent isShapeEnabled off on once prerender setTheme update createLayer

    Events

    EVENT_NODESATTACH EVENT_NODESDETACH EVENT_POINTERDOWN EVENT_POINTERMOVE EVENT_POINTERUP EVENT_POSITIONUPDATE EVENT_RENDERUPDATE EVENT_ROTATIONUPDATE EVENT_SCALEUPDATE EVENT_TRANSFORMEND EVENT_TRANSFORMMOVE EVENT_TRANSFORMSTART

    Constructors

    Properties

    Protected_app

    _app: AppBase

    Internal reference to the app containing the gizmo.

    Protected_camera

    _camera: CameraComponent

    Internal reference to camera component to view the gizmo.

    Protected_coordSpace

    _coordSpace: GizmoSpace = 'world'

    Internal version of coordinate space. Defaults to 'world'.

    Protected_device

    _device: GraphicsDevice

    Internal reference to the graphics device of the app.

    Protected_handles

    _handles: EventHandle[] = []

    Internal list of app event handles for the gizmo.

    Protected_layer

    _layer: Layer

    Internal reference to layer to render the gizmo..

    Protected_rootStartPos

    _rootStartPos: Vec3 = ...

    Internal gizmo starting rotation in world space.

    Protected_rootStartRot

    _rootStartRot: Quat = ...

    Internal gizmo starting rotation in world space.

    Protected_scale

    _scale: number = 1

    Internal version of the gizmo scale. Defaults to 1.

    Protected_selectedAxis

    _selectedAxis: "" | GizmoAxis = ''

    Internal currently selected axis.

    Protected_selectedIsPlane

    _selectedIsPlane: boolean = false

    Internal state of if currently selected shape is a plane.

    Protected_selectionStartPoint

    _selectionStartPoint: Vec3 = ...

    Internal selection starting coordinates in world space.

    Protected_shapes

    _shapes: { f: ArcShape; x: ArcShape; y: ArcShape; z: ArcShape } = ...

    Internal object containing the gizmo shapes to render.

    Protected_theme

    _theme: GizmoTheme = ...

    Internal theme.

    dragMode: GizmoDragMode = 'selected'

    Whether to hide the shapes when dragging. Defaults to 'selected'.

    intersectShapes: Shape[] = []

    The intersection shapes for the gizmo.

    nodes: GraphNode[] = []

    The graph nodes attached to the gizmo.

    orbitRotation: boolean = false

    This forces the rotation to always be calculated based on the mouse position around the gizmo.

    root: Entity

    The root gizmo entity.

    snapIncrement: number = 5

    Accessors

    Protected_dragging

    • 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 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

    Methods

    Protected_calculateAngle

    • _calculateAngle(point: Vec3, x: number, y: number): number
      Protected

      Parameters

      • point: Vec3

        The point.

      • x: number

        The x coordinate.

      • y: number

        The y coordinate.

      Returns number

      The angle.

    Protected_createPlane

    Protected_createRay

    Protected_createTransform

    Protected_dirFromAxis

    Protected_drawGuideLines

    Protected_drawSpanLine

    Protected_projectToAxis

    Protected_screenToPoint

    Protected_updatePosition

    Protected_updateRotation

    Protected_updateScale

    • 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.

      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

      Can be used for removing event in the future.

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

      const evt = obj.on('test', (a, b) => {
          console.log(a + b);
      });
      // some time later
      evt.off();

    • Attach an event handler to an event. This handler will be removed after being fired once.

      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

      • can be used for removing event in the future.
      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 pc.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.

      Returns Layer

      The new layer.

    Events

    EVENT_NODESATTACH: string = 'nodes:attach'

    Fired when graph nodes are attached.

    const gizmo = new pc.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 pc.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 pc.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 pc.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 pc.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 pc.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 when the gizmo render has updated.

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

    Fired when when the transformation has ended.

    const gizmo = new pc.TransformGizmo(camera, layer);
    gizmo.on('transform:end', () => {
        console.log('Transformation ended');
    });
    EVENT_TRANSFORMMOVE: string = 'transform:move'

    Fired during the transformation.

    const gizmo = new pc.TransformGizmo(camera, layer);
    gizmo.on('transform:move', (pointDelta, angleDelta) => {
        console.log('Transformation moved by ${pointDelta} (angle: ${angleDelta})');
    });
    EVENT_TRANSFORMSTART: string = 'transform:start'

    Fired when when the transformation has started.

    const gizmo = new pc.TransformGizmo(camera, layer);
    gizmo.on('transform:start', () => {
        console.log('Transformation started');
    });

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