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appliance-plugin

This plugin is based on the plugin mechanism of white-web-sdk, and realizes a set of whiteboard teaching AIDS drawing tools. At the same time, it is also based on @netless/window-manager, which can be used on multiple Windows.

Introduction

appliance-plugin, Depend on white-web-SDK, @netless/window-manager, And based on web API support for offscreenCanvas.

Principle

  1. The plugin is mainly based on the 2D functionality of SpriteJS, supports webgl2 rendering, and is backward compatible with downgrades to webgl and canvas2d
  2. The plugin uses the dual webWorker+offscreenCanvas mechanism to process the drawing calculation + rendering logic in a separate worker thread. Does not occupy cpu tasks of the main thread.

Plugin usage

Install

npm install @netless/appliance-plugin

Sign up for plugins

Plug-ins can support two scenarios, their access plug-in names are different:

  • Multi-window 'ApplianceMultiPlugin'
import { ApplianceMultiPlugin } from '@netless/appliance-plugin';
  • Single whiteboard 'ApplianceSinglePlugin'
import { ApplianceSinglePlugin } from '@netless/appliance-plugin';

workerjs file cdn deployment

We used two-worker concurrency to improve drawing efficiency, which improved it by more than 40% over single-thread efficiency. However, the common dependencies on the two worker files are repeated, so building directly into the package will greatly increase the package size. So we allow the workerjs file cdn deployment by simply deploying the file under @netless/appliance-plugin/cdn into the cdn and then configuring the c of the last two workerjs via the second parameter of getInstance in the plug-in, options.cdn The dn address is fine. This solves the problem of excessive package size

  • The total package is about 300kB, and the two wokerjs are 600kB each If you need to consider the size of the package you are building, select Configure cdn.

Access mode reference

fastboard(interconnection with fastboard)

// The method of importing worker.js is optional. If cdn is used, it does not need to be imported from dist. If dist is imported, it needs to be configured into options.cdn in the form of resource module and bolb inline. Such as '?raw', this requires packer support,vite default support '?raw',webpack needs to configure raw-loader or asset/source.
import fullWorkerString from '@netless/appliance-plugin/dist/fullWorker.js?raw';
import subWorkerString from '@netless/appliance-plugin/dist/subWorker.js?raw';
const fullWorkerBlob = new Blob([fullWorkerString], {type: 'text/javascript'});
const fullWorkerUrl = URL.createObjectURL(fullWorkerBlob);
const subWorkerBlob = new Blob([subWorkerString], {type: 'text/javascript'});
const subWorkerUrl = URL.createObjectURL(subWorkerBlob);

// interconnection with fastboard-react
// Full package mode reference
// import { useFastboard, Fastboard } from "@netless/fastboard-react/full";
// Subcontract reference
import { useFastboard, Fastboard } from "@netless/fastboard-react";

const app = useFastboard(() => ({
    sdkConfig: {
      ...
    },
    joinRoom: {
      ...
    },
    managerConfig: {
      cursor: true,
      enableAppliancePlugin: true,
      ...
    },
    enableAppliancePlugin: {
      cdn: {
          fullWorkerUrl,
          subWorkerUrl,
      }
      ...
    }
  }));

// interconnection with fastboard
// Full package mode reference
// import { createFastboard, createUI } from "@netless/fastboard/full";
// Subcontract reference
import { createFastboard, createUI } from "@netless/fastboard";

const fastboard = await createFastboard({
    sdkConfig: {
      ...
    },
    joinRoom: {
      ...
    },
    managerConfig: {
      cursor: true,
      supportAppliancePlugin: true,
      ...
    },
    enableAppliancePlugin: {
      cdn: {
          fullWorkerUrl,
          subWorkerUrl,
      }
      ...
    }
  });

Multi-window (Interconnecting with window-manager)

import '@netless/window-manager/dist/style.css'; 
import '@netless/appliance-plugin/dist/style.css'; 
import { WhiteWebSdk } from "white-web-sdk"; 
import { WindowManager } from "@netless/window-manager"; 
import { ApplianceMultiPlugin } from '@netless/appliance-plugin'; 
// The method of importing worker.js is optional. If cdn is used, it does not need to be imported from dist. If dist is imported, it needs to be configured into options.cdn in the form of resource module and bolb inline. Such as '?raw', this requires packer support,vite default support '?raw',webpack needs to configure raw-loader or asset/source.
import fullWorkerString from '@netless/appliance-plugin/dist/fullWorker.js?raw';
import subWorkerString from '@netless/appliance-plugin/dist/subWorker.js?raw';
const fullWorkerBlob = new Blob([fullWorkerString], {type: 'text/javascript'});
const fullWorkerUrl = URL.createObjectURL(fullWorkerBlob);
const subWorkerBlob = new Blob([subWorkerString], {type: 'text/javascript'});
const subWorkerUrl = URL.createObjectURL(subWorkerBlob);
 
const whiteWebSdk = new WhiteWebSdk(...) 
const room = await whiteWebSdk.joinRoom({ 
    ... 
    invisiblePlugins: [WindowManager, ApplianceMultiPlugin], 
    useMultiViews: true, 
}) 
const manager = await WindowManager.mount({ room , container:elm, chessboard: true, cursor: true, supportAppliancePlugin: true}); 
if (manager) { 
// await manager.switchMainViewToWriter(); 
await ApplianceMultiPlugin.getInstance(manager,
        {
            options: {
                cdn: {
                    fullWorkerUrl,
                    subWorkerUrl,
                }
            }
        }
    ); 
}

Note the css file import '@netless/appliance-plugin/dist/style.css' needs to be imported into the project;

Single whiteboard (interconnection with white-web-sdk)

import { WhiteWebSdk } from "white-web-sdk"; 
import { ApplianceSinglePlugin, ApplianceSigleWrapper } from '@netless/appliance-plugin'; 
// The method of importing worker.js is optional. If cdn is used, it does not need to be imported from dist. If dist is imported, it needs to be configured into options.cdn in the form of resource module and bolb inline. Such as '?raw', this requires packer support,vite default support '?raw',webpack needs to configure raw-loader or asset/source.
import fullWorkerString from '@netless/appliance-plugin/dist/fullWorker.js?raw';
import subWorkerString from '@netless/appliance-plugin/dist/subWorker.js?raw';
const fullWorkerBlob = new Blob([fullWorkerString], {type: 'text/javascript'});
const fullWorkerUrl = URL.createObjectURL(fullWorkerBlob);
const subWorkerBlob = new Blob([subWorkerString], {type: 'text/javascript'});
const subWorkerUrl = URL.createObjectURL(subWorkerBlob);
 
const whiteWebSdk = new WhiteWebSdk(...) 
const room = await whiteWebSdk.joinRoom({ 
... 
invisiblePlugins: [ApplianceSinglePlugin], 
wrappedComponents: [ApplianceSigleWrapper] 
}) 
await ApplianceSinglePlugin.getInstance(room,
    {
        options: {
            cdn: {
                fullWorkerUrl,
                subWorkerUrl,
            }
        }
    }
);

Note the css file import '@netless/appliance-plugin/dist/style.css' needs to be imported into the project;

About ’?raw‘ webpack configuration

module: {
    rules: [
        // ...
        {
            test: /\.m?js$/,
            resourceQuery: { not: [/raw/] },
            use: [ ... ]
        },
        {
            resourceQuery: /raw/,
            type: 'asset/source',
        }
    ]
},

Call introduction

api introduction

Optimize legacy interface

The plugin re-implements some of the interfaces of the same name on room or Windows Manager, but internally we have re-injected them back into the original object via injectMethodToObject. No changes are required for external users. As follows:

    // Internal hack
    injectMethodToObject(windowmanager, 'undo');
    injectMethodToObject(windowmanager, 'redo');
    injectMethodToObject(windowmanager,'cleanCurrentScene');
    injectMethodToObject(windowmanager,'insertImage');
    injectMethodToObject(windowmanager,'completeImageUpload');
    injectMethodToObject(windowmanager,'lockImage');
    injectMethodToObject(room,'getImagesInformation');
    injectMethodToObject(room,'callbacks');
    injectMethodToObject(room,'screenshotToCanvasAsync');
    injectMethodToObject(room,'getBoundingRectAsync');
    injectMethodToObject(room,'scenePreviewAsync');
    injectMethodToObject(windowmanager.mainView,'setMemberState');
    // These we can see the call behavior through the front-end log, for example:
    // [ApplianceMultiPlugin] setMemberState
    // [ApplianceMultiPlugin] cleanCurrentScene

The following interfaces are involved:

  1. Interface on room
  • setMemberState
  • undo
  • redo
  • callbacks
  • insertImage
  • lockImage
  • completeImageUpload
  • getImagesInformation
  • cleanCurrentScene
  1. windowmanager upper interface
  • cleanCurrentScene
  1. The mainview interface of windowmanager
  • setMemberState
  • undo
  • redo
  • callbacks
  • insertImage
  • lockImage
  • completeImageUpload
  • getImagesInformation
  • cleanCurrentScene
  1. Customize
  • getBoundingRectAsync Replace the api room.getBoundingRect
  • screenshotToCanvasAsync Replace the api room.screenshotToCanvas
  • scenePreviewAsync Replace the api room.scenePreview
  • destroy Destroy the instance of appliance-plugin
  • addListener add appliance plugin Listener
  • removeListener remove appliance plugin Listener
  • disableDeviceInputs Replace the api room.disableDeviceInputs
  • disableEraseImage Replace the api room.disableEraseImage This method only suppert when currentApplianceName is eraser

5.Incompatible

  • exportScene When the appliance-plugin is enabled, notes cannot be exported in room mode
  • Server-side screenshot, after the appliance-plugin is turned on, notes cannot be obtained by calling server-side screenshot, but need to use screenshotToCanvasAsync to obtain the screenshot

New features

  1. laserPen teaching aids (Version >=1.1.1)

    import { EStrokeType, ApplianceNames } from '@netless/appliance-plugin';
room.setMemberState({currentApplianceName: ApplianceNames.laserPen, strokeType: EStrokeType.Normal});

    Image

  2. Extended Teaching AIDS (Version >=1.1.1)

    export enum EStrokeType { 
    /** Solid line */ 
    Normal = 'Normal', 
    /** Line with pen edge */ 
    Stroke = 'Stroke', 
    /** Dotted line */ 
    Dotted = 'Dotted', 
    /** Long dotted line */ 
    LongDotted = 'LongDotted' 
};
export type ExtendMemberState = {
    /** The teaching AIDS selected by the current user */ 
    currentApplianceName: ApplianceNames; 
    /** Whether to open the pen tip */ 
    strokeType? : EStrokeType; 
    /** Whether to delete the entire line segment */ 
    isLine? : boolean; 
    /** Wireframe transparency */ 
    strokeOpacity? : number; 
    /** Whether to turn on laser pointer */ 
    useLaserPen? : boolean; 
    /** Laser pointer holding time, second */ 
    duration? : number; 
    /** Fill style */ 
    fillColor? : Color; 
    /** Fill transparency */ 
    fillOpacity? : number; 
    /** The specific type of graph to draw when using shape */ 
    shapeType? : ShapeType; 
    /** Number of polygon vertices */ 
    vertices? :number; 
    /** Length of the inner vertex of the polygon */ 
    innerVerticeStep? :number; 
    /** Ratio of the radius of the inner vertex of the polygon to the outer vertex */ 
    innerRatio? : number; 
    /** Text transparency */ 
    textOpacity? : number; 
    /** Text background color */ 
    textBgColor? : Color; 
    /** Text background color transparency */ 
    textBgOpacity? : number; 
    /** Location */ 
    placement? : SpeechBalloonPlacement;
};
import { ExtendMemberState, ApplianceNames } from '@netless/appliance-plugin';
/** Set the state of teaching AIDS  */
room.setMemberState({ ... } as ExtendMemberState);
manager.mainView.setMemberState({ ... } as ExtendMemberState);
appliance.setMemberState({ ... } as ExtendMemberState);
    • Set stroke type:
    // Solid line
setMemberState({strokeType: EStrokeType.Normal });
// Line with pen edge
setMemberState({strokeType: EStrokeType.Stroke });
// Dotted line
setMemberState({strokeType: EStrokeType.Dotted });
// Long dotted line
setMemberState({strokeType: EStrokeType.LongDotted });

    Image

    • Set stroke and shape border opacity (marker):
    setMemberState({strokeOpacity: 0.5 });

    Image

    • Set text color, text opacity, text background color, text background opacity
    setMemberState({textOpacity: 0.5, textBgOpacity: 0.5, textBgColor:[0, 0, 0]});

    Image

    • Set shape fill color and fill opacity
    setMemberState({fillOpacity: 0.5, fillColor:[0, 0, 0]});

    Image

    • Custom regular polygon
    // regular pentagon
setMemberState({currentApplianceName: ApplianceNames.shape, shapeType: ShapeType.Polygon, vertices: 5});

    Image

    • Custom star shape
    // fat hexagonal star
setMemberState({currentApplianceName: ApplianceNames.shape, shapeType: ShapeType.Star, vertices: 12, innerVerticeStep: 2, innerRatio: 0.8});

    Image

    • Customize the placement of the speechballoon
    // The dialog box in the lower left corner
setMemberState({currentApplianceName: ApplianceNames.shape, shapeType: ShapeType.SpeechBalloon, placement: 'bottomLeft'});

    Image

  3. Split screen display Elements (little whiteboard featrue), need to combine @netless/app-little-white-board (Version >=1.1.3) Image

  4. Minimap function (Version >=1.1.6)

    /** Create a minimap
 * @param viewId ID of the whiteboard under windowManager. The ID of the main whiteboard is mainView, and the ID of other whiteboards is the appID of addApp() return
 * @param div Small map DOM container
 */
createMiniMap(viewId: string, div: HTMLElement): Promise<void>;
/** Destroy minimap */
destroyMiniMap(viewId: string): Promise<void>;

    Image

  5. Filter Elements (Version >=1.1.6)

    /** Filter Elements
 * @param viewId ID of the whiteboard under windowManager. The ID of the main whiteboard is mainView, and the ID of other whiteboards is the appID of addApp() return
 * @param filter filter condition
 *  render: Whether notes can be rendered, [uid1, uid2,...] Or true. true, that is, both render, [uid1, uid2,...] The collection of user Uids rendered for the specified
 *  hide: Note is hidden, [uid1, uid2,...] Or true. true, that is to hide, [uid1, uid2,...] To specify a hidden user uid collection
 *  clear: Whether notes can be cleared, [uid1, uid2,...] Or true. true, that is, can be cleared, [uid1, uid2,...] Specifies a collection of user Uids that can be cleared
 * @param isSync Whether to synchronize data to other users. The default value is true, that is, the data will be synchronized to other users
 */
filterRenderByUid(viewId: string, filter: { render?: _ArrayTrue, hide?: _ArrayTrue, clear?: _ArrayTrue}, isSync?:boolean): void;
/** Filter Elements
 * @param viewId ID of the whiteboard under windowManager. The ID of the main whiteboard is mainView, and the ID of other whiteboards is the appID of addApp() return
 * @param isSync Whether to synchronize data to other users. The default value is true, that is, the data will be synchronized to other users. Keep it the same as the filterRenderByUid setting
 */
cancelFilterRender(viewId: string, isSync?:boolean): void;

    Image

Configure parameters

getInstance(wm: WindowManager, adaptor: ApplianceAdaptor)

  • wm: WindowManager\room\player. In multi-window mode, you pass WindowManager, and in single-window mode, you pass room or player(whiteboard playback mode).
  • adaptor: configures the adapter.
    • options: AppliancePluginOptions; The cdn addresses of both workers must be configured. 
          export type AppliancePluginOptions = { 
        /** cdn Configuration item */ 
        cdn: CdnOpt; 
        /** Synchronize data configuration items */ 
        syncOpt? : SyncOpt; 
        /** Canvas configuration item */ 
        canvasOpt? : CanvasOpt; 
        /** stroke width range */
        strokeWidth?: {
            min: number,
            max: number,
        }
    }
    • cursorAdapter? : CursorAdapter; This parameter is optional. In single whiteboard mode, customize the mouse style.
    • logger?: Logger; This parameter is optional. Configure the log printer object. The default output is on the local console. If logs need to be uploaded to the specified server, you need to manually configure the configuration.

      If you need to upload the log to the whiteboard log server, configure the room.logger to this item。

Front-end debugging introduction

During the interconnection process, if you want to understand and track the internal status of the plug-in, you can view the internal data through the following console commands.

const applianPlugin = await ApplianceSinglePlugin.getInstance(...) 
applianPlugin.CurrentManager  // can see the package version number, internal state, etc 
applianPlugin.CurrentManager.ConsoleWorkerInfo () // can check information to draw on the worker