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HW3: mastery check changes

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This commit is contained in:
Claudio Maggioni 2019-10-10 10:02:30 +02:00
parent 15bb5f52e2
commit 767fc8cb77
1 changed files with 24 additions and 12 deletions
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12
hw3/Claudio_Maggioni/scripts/app.js
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@ -56,11 +56,22 @@ class App {
const player = document.createElement('video'); const player = document.createElement('video');
player.addEventListener('loadeddata', () => { player.addEventListener('loadeddata', () => {
player.play();
setTimeout(() => {
const imgCanvas = document.createElement('canvas'); const imgCanvas = document.createElement('canvas');
imgCanvas.width = this.canvas.width; imgCanvas.width = this.canvas.width;
imgCanvas.height = this.canvas.height; imgCanvas.height = this.canvas.height;
const imgCtx = imgCanvas.getContext('2d'); const imgCtx = imgCanvas.getContext('2d');
imgCtx.drawImage(player, 0, 0, canvas.width, canvas.height); imgCtx.drawImage(player, 0, 0, canvas.width, canvas.height);
const imgData = imgCtx.getImageData(0, 0, imgCanvas.width,
imgCanvas.height);
for (let i = 0; i < data.length; i += 4) {
const pixel = (data[i] + 2 * data[i+1] + data[i+2]) / 4;
data[i] = data[i+1] = data[i+2] = pixel;
}
imgCtx.putImageData(imgData, 0, 0);
const img = document.createElement('img'); const img = document.createElement('img');
img.src = imgCanvas.toDataURL(); img.src = imgCanvas.toDataURL();
img.addEventListener('load', () => { img.addEventListener('load', () => {
@ -69,6 +80,7 @@ class App {
}); });
player.srcObject.getVideoTracks().forEach(track => track.stop()); player.srcObject.getVideoTracks().forEach(track => track.stop());
}, 100);
}); });
const button = document.createElement('button'); const button = document.createElement('button');