RenderWindow

Introduction

vtkRenderWindow is an abstract object to specify the behavior of a rendering window.

A rendering window is a window in a graphical user interface where renderers draw their images.
Methods are provided to synchronize the rendering process, set window size, and control double buffering.
The window also allows rendering in stereo. The interlaced render stereo type is for output to a VRex stereo projector.
All of the odd horizontal lines are from the left eye, and the even lines are from the right eye.
The user has to make the render window aligned with the VRex projector, or the eye will be swapped.

Methods

addRenderer

Add renderer

Argument	Type	Required	Description
renderer	vtkRenderer	Yes	The vtkRenderer instance.

addView

Add renderer

Argument	Type	Required	Description
view		Yes

captureImages

Argument	Type	Required	Description
format	String	Yes
opts	any	Yes

extend

Method use to decorate a given object (publicAPI+model) with vtkRenderWindow characteristics.

Argument	Type	Required	Description
publicAPI		Yes	object on which methods will be bounds (public)
model		Yes	object on which data structure will be bounds (protected)
initialValues	IRenderWindowInitialValues	No	(default: {})

getDefaultViewAPI

Switch the rendering backend between WebGL and WebGPU.
By default, the WebGL backend is used. To switch, to WebGPU call
renderWindow.setDefaultViewAPI('WebGPU') before calling render.

getInteractor

getNeverRendered

getNumberOfLayers

getRenderers

getRenderersByReference

getStatistics

getViews

hasRenderer

Argument	Type	Required	Description
ren	vtkRenderer	Yes

hasView

Argument	Type	Required	Description
view		Yes

invisiblePropCount

listViewAPIs

newAPISpecificView

newAPISpecificView

Argument	Type	Required	Description
name	String	Yes
{}		Yes	[initialValues]

newInstance

Method use to create a new instance of vtkRenderWindow

onCompletion

Argument	Type	Required	Description
callback		Yes

propCount

registerViewConstructor

removeRenderer

Remove renderer

Argument	Type	Required	Description
renderer	vtkRenderer	Yes	The vtkRenderer instance.

removeView

Remove renderer

Argument	Type	Required	Description
view		Yes

render

setDefaultViewAPI

Switch the rendering backend between WebGL and WebGPU.
By default, the WebGL backend is used. To switch, to WebGPU call
renderWindow.setDefaultViewAPI('WebGPU') before calling render.

Argument	Type	Required	Description
defaultViewAPI		Yes	(default: ‘WebGL’)

setInteractor

Argument	Type	Required	Description
interactor		Yes

setNumberOfLayers

Argument	Type	Required	Description
numberOfLayers		Yes

setViews

Argument	Type	Required	Description
views		Yes

str

Source

index.d.ts

import { vtkObject, vtkSubscription } from "../../../interfaces";
import vtkRenderer from "../Renderer";
import vtkRenderWindowInteractor from "../RenderWindowInteractor";
// import vtkOpenGLRenderWindow from "../../../OpenGL/RenderWindow";

export interface IRenderWindowInitialValues {	
	renderers?: vtkRenderer[],
	views?: vtkRenderWindow[],
	interactor?: any,
	neverRendered?: boolean,
	numberOfLayers?: number
}

interface IStatistics {

	/**
	 * 
	 */
	propCount: number;

	/**
	 * 
	 */
	invisiblePropCount: number;

	/**
	 * 
	 */
	str: string;
}

export const enum DEFAULT_VIEW_API {
	'WebGL',
	'WebGPU'
}

export interface vtkRenderWindow extends vtkObject {

	/**
	 * Add renderer
	 * @param {vtkRenderer} renderer The vtkRenderer instance.
	 */
	addRenderer(renderer: vtkRenderer): void;

	/**
	 * Add renderer
	 * @param view 
	 */
	addView(view: any): void;

	/**
	 * 
	 * @param {String} format 
	 * @param {*} opts 
	 */
	captureImages(format?: string, opts?: any): Promise<string>[];

	/**
	 * Switch the rendering backend between WebGL and WebGPU.
	 * By default, the WebGL backend is used. To switch, to WebGPU call
	 * `renderWindow.setDefaultViewAPI('WebGPU')` before calling `render`.
	 */
	getDefaultViewAPI(): string;

	/**
	 * 
	 */
	getInteractor(): vtkRenderWindowInteractor;

	/**
	 * 
	 */
	getNumberOfLayers(): number;

	/**
	 * 
	 */
	getNeverRendered(): boolean;

	/**
	 * 
	 */
	getRenderers(): vtkRenderer[];

	/**
	 * 
	 */
	getRenderersByReference(): vtkRenderer[];

	/**
	 * 
	 */
	getStatistics(): IStatistics;

	/**
	 * 
	 */
	getViews(): any[];

	// getViews(): vtkOpenGLRenderWindow[];

	/**
	 * 
	 * @param {vtkRenderer} ren 
	 * @return {Boolean} true if the windows has a renderer
	 */
	hasRenderer(ren: vtkRenderer): boolean;

	/**
	 * 
	 * @param view 
	 */
	hasView(view: any): boolean;

	//hasView(view: vtkOpenGLRenderWindow): boolean;

	/**
	 * 
	 * @param callback 
	 */
	onCompletion(callback: (instance: vtkObject) => any): vtkSubscription;

	/**
	 * 
	 * @param {String} name 
	 * @param {} [initialValues] 
	 */
	newAPISpecificView(name: string, initialValues?: object): any;

	/**
	 * Remove renderer
	 * @param {vtkRenderer} renderer The vtkRenderer instance.
	 */
	removeRenderer(renderer: vtkRenderer): void;

	/**
	 * Remove renderer
	 * @param view 
	 */
	removeView(view: any): void;

	/**
	 * 
	 */
	render(): void;

	/**
	 * Switch the rendering backend between WebGL and WebGPU.
	 * By default, the WebGL backend is used. To switch, to WebGPU call
	 * `renderWindow.setDefaultViewAPI('WebGPU')` before calling `render`.
	 * @param defaultViewAPI (default: 'WebGL')
	 */
	setDefaultViewAPI(defaultViewAPI: DEFAULT_VIEW_API): boolean;

	/**
	 * 
	 * @param interactor 
	 */
	setInteractor(interactor: vtkRenderWindowInteractor): boolean;

	/**
	 * 
	 * @param numberOfLayers 
	 */
	setNumberOfLayers(numberOfLayers: number): boolean;

	/**
	 * 
	 * @param views 
	 */
	setViews(views: any[]): boolean;

	// setViews(views: vtkOpenGLRenderWindow[]): boolean;
}


/**
 * Method use to decorate a given object (publicAPI+model) with vtkRenderWindow characteristics.
 *
 * @param publicAPI object on which methods will be bounds (public)
 * @param model object on which data structure will be bounds (protected)
 * @param {IRenderWindowInitialValues} [initialValues] (default: {})
 */
export function extend(publicAPI: object, model: object, initialValues?: IRenderWindowInitialValues): void;

/**
 * Method use to create a new instance of vtkRenderWindow 
 */
export function newInstance(initialValues?: IRenderWindowInitialValues): vtkRenderWindow;

/**
 * 
 */
export function registerViewConstructor(name: string, constructor: any): void;

/**
 * 
 */
export function listViewAPIs(): string[];

/**
 * 
 */
export function newAPISpecificView(name: string, initialValues: object): any;


/**
 * vtkRenderWindow is an abstract object to specify the behavior of a rendering window.
 * 
 * A rendering window is a window in a graphical user interface where renderers draw their images.
 * Methods are provided to synchronize the rendering process, set window size, and control double buffering.
 * The window also allows rendering in stereo. The interlaced render stereo type is for output to a VRex stereo projector.
 * All of the odd horizontal lines are from the left eye, and the even lines are from the right eye.
 * The user has to make the render window aligned with the VRex projector, or the eye will be swapped.
 */
export declare const vtkRenderWindow: {
	newInstance: typeof newInstance,
	extend: typeof extend,
	registerViewConstructor: typeof registerViewConstructor,
	listViewAPIs: typeof listViewAPIs,
	newAPISpecificView: typeof newAPISpecificView,
};
export default vtkRenderWindow;

index.js

import macro from 'vtk.js/Sources/macros';

const DEFAULT_VIEW_API = 'WebGL';
const VIEW_CONSTRUCTORS = Object.create(null);

// ----------------------------------------------------------------------------
// static methods
// ----------------------------------------------------------------------------

export function registerViewConstructor(name, constructor) {
  VIEW_CONSTRUCTORS[name] = constructor;
}

export function listViewAPIs() {
  return Object.keys(VIEW_CONSTRUCTORS);
}

export function newAPISpecificView(name, initialValues = {}) {
  return VIEW_CONSTRUCTORS[name] && VIEW_CONSTRUCTORS[name](initialValues);
}

// ----------------------------------------------------------------------------
// vtkRenderWindow methods
// ----------------------------------------------------------------------------

function vtkRenderWindow(publicAPI, model) {
  // Set our className
  model.classHierarchy.push('vtkRenderWindow');

  // Add renderer
  publicAPI.addRenderer = (renderer) => {
    if (publicAPI.hasRenderer(renderer)) {
      return;
    }
    renderer.setRenderWindow(publicAPI);
    model.renderers.push(renderer);

    // for (this->Renderers->InitTraversal(rsit);
    //      (aren = this->Renderers->GetNextRenderer(rsit)); )
    //   {
    //   aren->SetAllocatedRenderTime
    //     (1.0/(this->DesiredUpdateRate*this->Renderers->GetNumberOfItems()));
    //   }

    publicAPI.modified();
  };

  // Remove renderer
  publicAPI.removeRenderer = (renderer) => {
    model.renderers = model.renderers.filter((r) => r !== renderer);
    publicAPI.modified();
  };

  publicAPI.hasRenderer = (ren) => model.renderers.indexOf(ren) !== -1;

  // get an API specific view of this data
  publicAPI.newAPISpecificView = (name, initialValues = {}) =>
    newAPISpecificView(name || model.defaultViewAPI, initialValues);

  // Add renderer
  publicAPI.addView = (view) => {
    if (publicAPI.hasView(view)) {
      return;
    }
    view.setRenderable(publicAPI);
    model._views.push(view);
    publicAPI.modified();
  };

  // Remove renderer
  publicAPI.removeView = (view) => {
    model._views = model._views.filter((r) => r !== view);
    publicAPI.modified();
  };

  publicAPI.hasView = (view) => model._views.indexOf(view) !== -1;

  // handle any pre render initializations
  publicAPI.preRender = () => {
    model.renderers.forEach((ren) => {
      // make sure we have a camera
      if (!ren.isActiveCameraCreated()) {
        ren.resetCamera();
      }
    });
  };

  publicAPI.render = () => {
    publicAPI.preRender();
    if (model.interactor) {
      model.interactor.render();
    } else {
      model._views.forEach((view) => view.traverseAllPasses());
    }
  };

  publicAPI.getStatistics = () => {
    const results = { propCount: 0, invisiblePropCount: 0 };
    model.renderers.forEach((ren) => {
      const props = ren.getViewProps();
      props.forEach((prop) => {
        if (prop.getVisibility()) {
          results.propCount += 1;
          const mpr = prop.getMapper && prop.getMapper();
          if (mpr && mpr.getPrimitiveCount) {
            const pcount = mpr.getPrimitiveCount();
            Object.keys(pcount).forEach((keyName) => {
              if (!results[keyName]) {
                results[keyName] = 0;
              }
              results[keyName] += pcount[keyName];
            });
          }
        } else {
          results.invisiblePropCount += 1;
        }
      });
    });
    results.str = Object.keys(results)
      .map((keyName) => `${keyName}: ${results[keyName]}`)
      .join('\n');

    return results;
  };

  publicAPI.captureImages = (format = 'image/png', opts = {}) => {
    macro.setImmediate(publicAPI.render);
    return model._views
      .map((view) =>
        view.captureNextImage ? view.captureNextImage(format, opts) : undefined
      )
      .filter((i) => !!i);
  };
}

// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------

const DEFAULT_VALUES = {
  defaultViewAPI: DEFAULT_VIEW_API,
  renderers: [],
  views: [],
  interactor: null,
  neverRendered: true,
  numberOfLayers: 1,
};

// ----------------------------------------------------------------------------

export function extend(publicAPI, model, initialValues = {}) {
  Object.assign(model, DEFAULT_VALUES, initialValues);

  // Build VTK API
  macro.obj(publicAPI, model);

  macro.setGet(publicAPI, model, [
    'interactor',
    'numberOfLayers',
    '_views',
    'defaultViewAPI',
  ]);
  macro.get(publicAPI, model, ['neverRendered']);
  macro.getArray(publicAPI, model, ['renderers']);
  macro.moveToProtected(publicAPI, model, ['views']);
  macro.event(publicAPI, model, 'completion');

  // Object methods
  vtkRenderWindow(publicAPI, model);
}

// ----------------------------------------------------------------------------

export const newInstance = macro.newInstance(extend, 'vtkRenderWindow');

// ----------------------------------------------------------------------------

export default {
  newInstance,
  extend,
  registerViewConstructor,
  listViewAPIs,
  newAPISpecificView,
};