HoloPlayCore.Message

A class to represent messages being sent over to HoloPlay Service. This is the base class, and users should aim to use the child classes that we provide below if possible unless you need a very specific custom Message. If you use the base class, you will have to construct the objects yourself.

All Message classes have cmd, and only quilt related ones have bin for binary data of the quilt.

See here for a list of error codes.

Constructor

• cmd object of the corresponsding settings for each command type.

• bin binary data of the quilt, if it is a quilt-related message.

Examples

let msg = new Message({"info": ""}, binaryData);
client.sendMessage(msg)
  .then(() => console.log("Response received"))
  .catch((err) => console.log(err))

Methods

.toCbor()

Convert the class instance into CBOR format.

InitMessage

Extends Message

Extends the base Message class. If you provide following parameters in the constructor of HoloPlayCore.Client, this command will be called automatically, and you don't need to call it yourself.

Parameters

• appId string optional; an identifier to specify what application it is in HoloPlay Service. If the same appId is provided, different connections will be treat as the same application and have access to cached quilts. If not provided, HoloPlay Service will generate a random string.

• isGreedy boolean optional; this feature is currently not implemented.

• oncloseBehavior string optional, determines behavior when all instances of a given app ID disconnect. Can be wipe, hide, or none, default is hide.

  • wipe : clear the screen, display the default background.

  • hide : hide the window on the Looking Glass.

  • none : do nothing.

• debug boolean optional; default is false. If true, there will be logging messages in console.

Returns information of the connected Looking Glass devices, in the format of device status response.

Examples

let initMsg = new InitMessage("Test Looking Glass app", false, "wipe");
client.sendMessage(initMsg)
 .then((res) => console.log(res));

InfoMessage

Extends Message

Extends the base Message class. Gets info from HoloPlay Service.

Returns information of the connected Looking Glass devices, in the format of device status response.

Examples

let infoMsg = new InfoMessage();
client.sendMessage(infoMsg)
 .then((res) => console.log(res));

ShowMessage

Extends Message

Extends the base Message class. Show a quilt directly without caching it.

Parameters

• settings object optional, default {vx: 1,vy: 1,aspect:1.6}, for detailed format see quilt settings.
• bindata Uint8Array, optional, default '', but you will have to set it later.

• targetDisplay int, optional, default 0.

Examples

let xhttp = new XMLHttpRequest();
xhttp.responseType = 'arraybuffer';
xhttp.onreadystatechange = function () {
    if (this.readyState == 4) {
        if (this.status == 200) {
            const quiltData = new Uint8Array(this.response);
            const showCmd = new ShowMessage(
                {vx: 5, vy: 9, vtotal: 45, aspect: 1.6},
                quiltData,
                0
            );
            client.sendMessage(showCmd)
            .then(() => alert("Quilt displayed!"));
        } else {
            console.log("Could not load " + quiltUrl + "!");
        }
    }
};
xhttp.open("GET", quiltUrl, true);
xhttp.send();

CacheMessage

Extends Message

Extends the base Message class. This message sends a quilt image to the cache, and you can send a ShowCachedMessage later to show it.

Parameters

• name string, the name of the quilt being cached, for later retrieval.

• settings object optional, default {vx:1,vy:1,aspect:1.6}, for detailed format see quilt settings.
• bindata (optional, default '').

• show (optional, default false).

ShowCachedMessage

Extends Message

Extends the base Message class. Retrieve and show a previously cached quilt by name. If you're not sure if a quilt is cached, use the CheckMessage command to check. If you try to show an uncached image, HoloPlay Service will respond with error code 3.

Parameters

• name string, the name of the quilt in the cache.

• targetDisplay int, optional, default 0.

• settings object optional, default {vx:5,vy:9,aspect:1.6}, for detailed format see quilt settings. (THERE'S STILL INCONSISTENCY IN WHAT THE DEFAULT SETTINGS ARE, NEEDS TO BE RESOLVED)

CheckMessage

Extends Message

Check if a quilt exist in the cache. Extends the base Message class.

Parameters

• name string name of the quilt (optional, default '').

Example

let checkCmd = new CheckMessage('quilt1')
client.sendMessage(checkCmd)
  .then((res) => {
    if (res['error'] === 0) {
        // quilt found in cache
        let showCachedCmd = new ShowCachedMessage('quilt1');
        client.sendMessage(showCachedCmd);
    } else if (res['error'] === 5) {
        // quilt not cached
        let showCmd = new ShowMessage({vx:5, vy:9, aspect: 1.6}, quiltBinaryData);
        client.sendMessage(showCmd);
    }
  });

DeleteMessage

Extends Message

Extends the base Message class. Deletes a previously cached quilt from HoloPlay Service.

Parameters

• name string; name of the quilt.

WipeMessage

Extends Message

Extends the base Message class. Wipes the image in Looking Glass and displays the background image.

Parameters

• targetDisplay (optional, default 0).