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/**
* Visualization Module
* Handles canvas rendering, skeleton overlay, and visual effects
*/
export class Visualizer {
constructor() {
this.canvas = null;
this.ctx = null;
this.animationFrame = null;
this.isPlaying = false;
// Visualization settings
this.settings = {
showSkeleton: true,
showKeypoints: true,
showTrails: false,
lineThickness: 2,
pointRadius: 4,
trailLength: 10
};
// Color scheme
this.colors = {
highConfidence: '#10b981', // Green
medConfidence: '#f59e0b', // Orange
lowConfidence: '#ef4444', // Red
connection: '#6366f1' // Blue
};
// Trail history
this.trailHistory = [];
this.maxTrailLength = 30;
// Skeleton connections (MediaPipe Pose landmark indices)
this.connections = [
// Face
[0, 1], [1, 2], [2, 3], [3, 7],
[0, 4], [4, 5], [5, 6], [6, 8],
// Torso
[9, 10], [11, 12], [11, 23], [12, 24], [23, 24],
// Arms
[11, 13], [13, 15], [15, 17], [15, 19], [15, 21],
[12, 14], [14, 16], [16, 18], [16, 20], [16, 22],
// Legs
[23, 25], [25, 27], [27, 29], [27, 31],
[24, 26], [26, 28], [28, 30], [28, 32]
];
}
/**
* Initialize canvas overlay
*/
init(videoId, canvasId = null) {
const video = document.getElementById(videoId);
if (!video) {
console.error('Video element not found');
return false;
}
// Create or get canvas
if (canvasId) {
this.canvas = document.getElementById(canvasId);
} else {
this.canvas = this.createOverlayCanvas(video);
}
if (!this.canvas) {
console.error('Canvas element not found or could not be created');
return false;
}
this.ctx = this.canvas.getContext('2d');
// Match canvas size to video
this.resizeCanvas(video);
// Handle video resize
video.addEventListener('loadedmetadata', () => {
this.resizeCanvas(video);
});
window.addEventListener('resize', () => {
this.resizeCanvas(video);
});
return true;
}
/**
* Create overlay canvas above video
*/
createOverlayCanvas(video) {
const canvas = document.createElement('canvas');
canvas.id = 'overlay-canvas';
canvas.style.position = 'absolute';
canvas.style.top = '0';
canvas.style.left = '0';
canvas.style.pointerEvents = 'none';
canvas.style.zIndex = '10';
// Insert canvas after video
video.parentNode.style.position = 'relative';
video.parentNode.appendChild(canvas);
return canvas;
}
/**
* Resize canvas to match video
*/
resizeCanvas(video) {
if (!this.canvas) return;
this.canvas.width = video.videoWidth || video.clientWidth;
this.canvas.height = video.videoHeight || video.clientHeight;
this.canvas.style.width = video.clientWidth + 'px';
this.canvas.style.height = video.clientHeight + 'px';
}
/**
* Draw skeleton from pose landmarks
*/
drawSkeleton(landmarks, confidence = 0.5) {
if (!this.ctx || !landmarks || landmarks.length === 0) return;
this.clear();
const width = this.canvas.width;
const height = this.canvas.height;
// Draw connections
if (this.settings.showSkeleton) {
this.ctx.lineWidth = this.settings.lineThickness;
this.connections.forEach(([startIdx, endIdx]) => {
if (startIdx < landmarks.length && endIdx < landmarks.length) {
const start = landmarks[startIdx];
const end = landmarks[endIdx];
// Check visibility
if (start[2] > confidence && end[2] > confidence) {
const x1 = start[0] * width;
const y1 = start[1] * height;
const x2 = end[0] * width;
const y2 = end[1] * height;
// Color based on average confidence
const avgConf = (start[2] + end[2]) / 2;
this.ctx.strokeStyle = this.getConfidenceColor(avgConf);
// Draw line
this.ctx.beginPath();
this.ctx.moveTo(x1, y1);
this.ctx.lineTo(x2, y2);
this.ctx.stroke();
}
}
});
}
// Draw keypoints
if (this.settings.showKeypoints) {
landmarks.forEach((landmark, idx) => {
if (landmark[2] > confidence) {
const x = landmark[0] * width;
const y = landmark[1] * height;
const conf = landmark[2];
// Draw point
this.ctx.fillStyle = this.getConfidenceColor(conf);
this.ctx.beginPath();
this.ctx.arc(x, y, this.settings.pointRadius, 0, 2 * Math.PI);
this.ctx.fill();
// Draw landmark index (for debugging)
// this.ctx.fillStyle = 'white';
// this.ctx.font = '10px Arial';
// this.ctx.fillText(idx, x + 5, y - 5);
}
});
}
// Draw trails if enabled
if (this.settings.showTrails) {
this.drawTrails();
}
}
/**
* Get color based on confidence score
*/
getConfidenceColor(confidence) {
if (confidence >= 0.8) {
return this.colors.highConfidence;
} else if (confidence >= 0.5) {
return this.colors.medConfidence;
} else {
return this.colors.lowConfidence;
}
}
/**
* Add pose to trail history
*/
addToTrail(landmarks) {
if (!landmarks) return;
this.trailHistory.push(landmarks);
// Keep trail length limited
if (this.trailHistory.length > this.maxTrailLength) {
this.trailHistory.shift();
}
}
/**
* Draw movement trails
*/
drawTrails() {
if (this.trailHistory.length < 2) return;
const width = this.canvas.width;
const height = this.canvas.height;
// Draw trails for key points (e.g., wrists and ankles)
const trailPoints = [15, 16, 27, 28]; // Left/right wrists and ankles
trailPoints.forEach(pointIdx => {
this.ctx.strokeStyle = this.colors.connection;
this.ctx.lineWidth = 1;
this.ctx.globalAlpha = 0.5;
this.ctx.beginPath();
let firstPoint = true;
this.trailHistory.forEach((landmarks, idx) => {
if (pointIdx < landmarks.length) {
const point = landmarks[pointIdx];
if (point[2] > 0.5) { // Visibility threshold
const x = point[0] * width;
const y = point[1] * height;
if (firstPoint) {
this.ctx.moveTo(x, y);
firstPoint = false;
} else {
this.ctx.lineTo(x, y);
}
}
}
});
this.ctx.stroke();
this.ctx.globalAlpha = 1.0;
});
}
/**
* Clear canvas
*/
clear() {
if (!this.ctx) return;
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
/**
* Draw text overlay
*/
drawText(text, x, y, options = {}) {
if (!this.ctx) return;
const {
font = '16px Arial',
color = '#ffffff',
background = 'rgba(0, 0, 0, 0.7)',
padding = 8
} = options;
this.ctx.font = font;
const metrics = this.ctx.measureText(text);
const textWidth = metrics.width;
const textHeight = 20; // Approximate height
// Draw background
if (background) {
this.ctx.fillStyle = background;
this.ctx.fillRect(
x - padding,
y - textHeight - padding,
textWidth + padding * 2,
textHeight + padding * 2
);
}
// Draw text
this.ctx.fillStyle = color;
this.ctx.fillText(text, x, y);
}
/**
* Draw info box with stats
*/
drawInfoBox(info, position = 'top-left') {
if (!this.ctx || !info) return;
const padding = 10;
const lineHeight = 20;
const lines = Object.entries(info).map(([key, value]) => `${key}: ${value}`);
// Calculate box dimensions
this.ctx.font = '14px Arial';
const maxWidth = Math.max(...lines.map(line => this.ctx.measureText(line).width));
const boxWidth = maxWidth + padding * 2;
const boxHeight = lines.length * lineHeight + padding * 2;
// Determine position
let x, y;
switch (position) {
case 'top-left':
x = padding;
y = padding;
break;
case 'top-right':
x = this.canvas.width - boxWidth - padding;
y = padding;
break;
case 'bottom-left':
x = padding;
y = this.canvas.height - boxHeight - padding;
break;
case 'bottom-right':
x = this.canvas.width - boxWidth - padding;
y = this.canvas.height - boxHeight - padding;
break;
default:
x = padding;
y = padding;
}
// Draw background
this.ctx.fillStyle = 'rgba(0, 0, 0, 0.7)';
this.ctx.fillRect(x, y, boxWidth, boxHeight);
// Draw border
this.ctx.strokeStyle = '#6366f1';
this.ctx.lineWidth = 2;
this.ctx.strokeRect(x, y, boxWidth, boxHeight);
// Draw text
this.ctx.fillStyle = '#ffffff';
this.ctx.font = '14px Arial';
lines.forEach((line, idx) => {
this.ctx.fillText(line, x + padding, y + padding + (idx + 1) * lineHeight);
});
}
/**
* Draw FPS counter
*/
drawFPS(fps) {
this.drawText(`FPS: ${fps.toFixed(1)}`, 10, 30, {
font: '16px monospace',
color: '#10b981'
});
}
/**
* Toggle skeleton visibility
*/
toggleSkeleton() {
this.settings.showSkeleton = !this.settings.showSkeleton;
return this.settings.showSkeleton;
}
/**
* Toggle keypoints visibility
*/
toggleKeypoints() {
this.settings.showKeypoints = !this.settings.showKeypoints;
return this.settings.showKeypoints;
}
/**
* Toggle trails
*/
toggleTrails() {
this.settings.showTrails = !this.settings.showTrails;
if (!this.settings.showTrails) {
this.trailHistory = [];
}
return this.settings.showTrails;
}
/**
* Update settings
*/
updateSettings(newSettings) {
this.settings = { ...this.settings, ...newSettings };
}
/**
* Destroy visualizer
*/
destroy() {
if (this.animationFrame) {
cancelAnimationFrame(this.animationFrame);
}
if (this.canvas && this.canvas.parentNode) {
this.canvas.parentNode.removeChild(this.canvas);
}
this.ctx = null;
this.canvas = null;
}
}
// Create global instance
export const visualizer = new Visualizer(); |