Hello jsqr / Fil | Observable

Fil

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Aug 29, 2019

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Hello

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Hello jsqr

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QRcode

jsQR = require("jsqr")

image = {

if (camera) {

const stream = navigator.mediaDevices

? navigator.mediaDevices.getUserMedia({ video: true })

: new Promise((y, n) => navigator.getUserMedia({ video: true }, y, n));

const video = html`<video autoplay=true playsinline=true></video>`;

video.style.maxWidth = "100%";

yield stream.then(stream => {

if ("srcObject" in video) video.srcObject = stream;

else video.src = URL.createObjectURL(stream);

invalidation.then(() => {

stream.getTracks().forEach(t => t.stop());

URL.revokeObjectURL(video.src);

});

return video;

});

while (true) {

yield video;

}

} else {

yield new Promise((resolve, reject) => {

const image = new Image();

image.onload = () => resolve(image);

image.onerror = reject;

image.crossOrigin = "anonymous";

image.src = url;

});

}

watcher = {

const r = jsQR(imageData.data, N, P);

if (r) mutable result = r;

}

mutable N = 600 // this could be informed by the camera (I suppose)

mutable P = 300

imageData = {

const width = N,

height = P;

const context = this ? this.context : DOM.context2d(width, height, 1);

context.drawImage(image, 0, 0, width, height);

const data = context.getImageData(0, 0, width, height);

data.context = context;

return data;

}

viewof url = html`<input style="width:100%;padding:4px;" value="https://cors-anywhere.herokuapp.com/https://hips.hearstapps.com/pop.h-cdn.co/assets/15/35/768x380/gallery-1440781189-wiki.png">`

import {checkbox} from "@jashkenas/inputs"

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