Saya cuba untuk memaparkan kunci pada kanvas yang saya boleh dapatkan daripada Blaze Pose, tetapi saya nampaknya tidak dapat membuat mereka melukis ke kanvas. Saya tahu x dan y bagi setiap titik kunci diambil, tetapi saya tidak boleh mendapatkannya untuk dipaparkan pada kanvas. Saya telah cuba mengubah gaya tetapi setakat ini tidak berjaya. terima kasih atas bantuan anda.
const video = document.getElementById('webcam');
const canvas = document.getElementById('output')
const liveView = document.getElementById('liveView');
const demosSection = document.getElementById('demos');
const enableWebcamButton = document.getElementById('webcamButton');
const ctx = canvas.getContext("2d");
let poses;
function getUserMediaSupported() {
return !!(navigator.mediaDevices &&
navigator.mediaDevices.getUserMedia);
}
if (getUserMediaSupported()) {
enableWebcamButton.addEventListener('click', enableCam);
} else {
console.warn('getUserMedia() is not supported by your browser');
}
// Enable the live webcam view and start classification.
function enableCam(event) {
if (!model) {
return;
}
// Hide the button once clicked.
event.target.classList.add('removed');
// getUsermedia parameters to force video but not audio.
const constraints = {
video: true
};
document.getElementById('output').style.zIndex = "6";
// Activate the webcam stream.
navigator.mediaDevices.getUserMedia(constraints).then(function(stream) {
video.srcObject = stream;
video.addEventListener('loadeddata', predictWebcam);
});
}
async function predictWebcam() {
const videoHeight = video.videoHeight;
const videoWidth = video.videoWidth;
video.width = videoWidth;
video.height = videoHeight;
canvas.width = videoWidth;
canvas.height = videoHeight;
poses = await detector.estimatePoses(video)
//ctx.drawImage(video, 0, 0, video.videoWidth, video.videoHeight);
if(poses && poses.length > 0){
for(const pose of poses){
if(pose.keypoints != null){
drawKeypoints(pose.keypoints);
}
}
}
window.requestAnimationFrame(predictWebcam);
}
function drawKeypoints(keypoints){
for(let i = 0; i < keypoints.length; i++){
drawKeypoint(keypoints[i]);
}
}
function drawKeypoint(keypoint){
ctx.fillStyle = 'Orange';
ctx.strokeStyle = 'Green';
ctx.lineWidth = 2;
const radius = 4;
const circle = new Path2D();
circle.arc(keypoint.x, keypoint.y, radius, 0, 2 * Math.PI)
ctx.fill(circle)
ctx.stroke(circle)
}
// Store the resulting model in the global scope of our app.
let model = undefined;
let detector = undefined;
// Before we can use BlazePose class we must wait for it to finish
async function loadModel(){
model = poseDetection.SupportedModels.BlazePose;
const detectorConfig = {
runtime: 'tfjs',
enableSmoothing: true,
modelType: 'full'
};
detector = await poseDetection.createDetector(model, detectorConfig);
demosSection.classList.remove('invisible');
}
loadModel();
<!DOCTYPE html>
<html lang="en">
<head>
<title>Measuring App</title>
<meta charset="utf-8">
<!-- Import the webpage's stylesheet -->
<link rel="stylesheet" href="style.css">
</head>
<body>
<h1>Measuring App</h1>
<p>Wait for the model to load before clicking the button to enable the webcam - at which point it will become visible to use.</p>
<section id="demos" class="invisible">
<div id="liveView" class="camView">
<button id="webcamButton">Enable Webcam</button>
<canvas id="output"></canvas>
<video id="webcam" autoplay muted width="640" height="480"></video>
</div>
</section>
<!-- Import TensorFlow.js library -->
<script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs/dist/tf.min.js" type="text/javascript"></script>
<!-- Load the coco-ssd model to use to recognize things in images -->
<script src="https://cdn.jsdelivr.net/npm/@tensorflow-models/pose-detection"></script>
<!-- Import the page's JavaScript to do some stuff -->
<script src="script.js" defer></script>
</body>
</html>
body {
font-family: helvetica, arial, sans-serif;
margin: 2em;
color: #3D3D3D;
}
h1 {
font-style: italic;
color: #FF6F00;
}
video {
display: block;
}
section {
opacity: 1;
transition: opacity 500ms ease-in-out;
}
.removed {
display: none;
z-index: -10;
}
.invisible {
opacity: 0.2;
}
.camView {
position: relative;
float: left;
width: calc(100% - 20px);
margin: 10px;
cursor: pointer;
}
.camView p {
position: absolute;
padding: 5px;
background-color: rgba(255, 111, 0, 0.85);
color: #FFF;
border: 1px dashed rgba(255, 255, 255, 0.7);
z-index: 1;
font-size: 12px;
}
#output {
position: absolute;
z-index: -100;
top: 0;
bottom: 0;
left: 0;
} 
![[Web front-end] Permulaan pantas Node.js](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Anda harus melakukan pembaikan ini:
predictCam:drawKeypoints:Sebenarnya, saya juga menambah baris ini pada permulaan fungsi loadModel untuk menjadikannya berfungsi sepenuhnya.