321 lines
11 KiB
JavaScript
321 lines
11 KiB
JavaScript
class MatrixBackground {
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constructor() {
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this.canvas = document.getElementById('matrixCanvas');
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this.ctx = this.canvas.getContext('2d');
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this.dots = [];
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this.connections = [];
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this.mouse = { x: -9999, y: -9999, active: false };
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this.rafId = null;
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this.isRunning = true;
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this.prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
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this.config = {
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dotCount: this.getMobileDotCount(),
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dotSpeed: 0.2,
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connectionDuration: { min: 2000, max: 6000 },
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connectionChance: 0.0002,
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maxConnections: this.getMobileMaxConnections(),
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dotSize: 3,
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mouseRadius: 110,
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mouseForce: 0.6,
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// Palette synced to the UI accent tokens
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colors: {
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dotDefault: 'rgba(230, 240, 255, 0.78)',
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dotDefaultGlow: 'rgba(180, 220, 255, 0.40)',
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dotConnected: 'rgba(120, 190, 245, 0.85)',
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dotConnectedGlow: 'rgba(79, 195, 247, 0.55)',
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connection: {
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start: 'rgba(102, 126, 234, 0.22)',
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middle: 'rgba(118, 75, 162, 0.62)',
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end: 'rgba(79, 195, 247, 0.22)'
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}
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}
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};
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this.init();
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}
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getMobileDotCount() {
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if (window.innerWidth <= 480) return 35;
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if (window.innerWidth <= 768) return 45;
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if (window.innerWidth >= 2100) return 100;
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return 50;
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}
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getMobileMaxConnections() {
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if (window.innerWidth <= 480) return 4;
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if (window.innerWidth <= 768) return 6;
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return 8;
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}
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init() {
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this.handleResize();
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this.bindEvents();
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this.animate();
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}
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bindEvents() {
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// Pointer reactivity — push dots away from cursor for a "matrix repel" feel.
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// Touch devices are included; the dot pushes happen only while touched.
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window.addEventListener('pointermove', (e) => {
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this.mouse.x = e.clientX;
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this.mouse.y = e.clientY;
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this.mouse.active = true;
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}, { passive: true });
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window.addEventListener('pointerout', () => {
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this.mouse.active = false;
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this.mouse.x = -9999;
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this.mouse.y = -9999;
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});
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// Pause the rAF loop when the tab is hidden to save CPU / battery.
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document.addEventListener('visibilitychange', () => {
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if (document.hidden) {
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this.stop();
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} else {
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this.start();
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}
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});
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// Resize is debounced via rAF; disabled on mobile for perf parity with original.
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if (window.innerWidth > 768) {
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let resizeRaf = null;
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window.addEventListener('resize', () => {
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if (resizeRaf) cancelAnimationFrame(resizeRaf);
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resizeRaf = requestAnimationFrame(() => this.handleResize());
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});
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}
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}
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start() {
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if (this.rafId || !this.isRunning) return;
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this.animate();
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}
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stop() {
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if (this.rafId) {
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cancelAnimationFrame(this.rafId);
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this.rafId = null;
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}
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}
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handleResize() {
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this.canvas.width = window.innerWidth;
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this.canvas.height = window.innerHeight;
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this.config.dotCount = this.getMobileDotCount();
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this.config.maxConnections = this.getMobileMaxConnections();
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this.createDots();
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}
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createDots() {
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this.dots = [];
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for (let i = 0; i < this.config.dotCount; i++) {
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this.createDot();
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}
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}
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createDot() {
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const startX = Math.random() * (this.canvas.width - 20) + 10;
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const startY = Math.random() * (this.canvas.height - 20) + 10;
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const angle = Math.random() * Math.PI * 2;
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const speed = this.config.dotSpeed * (0.8 + Math.random() * 0.4);
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const baseVelocityX = Math.cos(angle) * speed;
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const baseVelocityY = Math.sin(angle) * speed;
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this.dots.push({
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x: startX,
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y: startY,
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vx: baseVelocityX,
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vy: baseVelocityY,
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baseVx: baseVelocityX,
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baseVy: baseVelocityY,
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wanderPhase: Math.random() * Math.PI * 2,
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wanderSpeed: 0.01 + Math.random() * 0.01,
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opacity: Math.random() * 0.3 + 0.7,
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size: this.config.dotSize + Math.random() * 2,
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connectionCount: 0
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});
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}
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updateDots() {
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const radius = this.config.mouseRadius;
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const radiusSq = radius * radius;
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const force = this.config.mouseForce;
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this.dots.forEach(dot => {
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// Mouse repulsion
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if (this.mouse.active) {
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const dx = dot.x - this.mouse.x;
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const dy = dot.y - this.mouse.y;
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const distSq = dx * dx + dy * dy;
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if (distSq < radiusSq && distSq > 0.5) {
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const dist = Math.sqrt(distSq);
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const strength = (1 - dist / radius) * force;
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dot.vx += (dx / dist) * strength;
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dot.vy += (dy / dist) * strength;
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}
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}
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dot.x += dot.vx;
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dot.y += dot.vy;
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// Ease back to a gentle autonomous drift after pointer interaction.
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dot.wanderPhase += dot.wanderSpeed;
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const wanderX = Math.cos(dot.wanderPhase) * 0.03;
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const wanderY = Math.sin(dot.wanderPhase * 0.8) * 0.03;
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dot.vx += (dot.baseVx + wanderX - dot.vx) * 0.02;
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dot.vy += (dot.baseVy + wanderY - dot.vy) * 0.02;
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// Reflect at the canvas edge. Keep the base velocity in sync with
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// the bounce so the drift easing does not push the dot back into
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// the same wall on the next frames.
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const radius = dot.size / 2;
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const minX = radius;
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const minY = radius;
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const maxX = Math.max(minX, this.canvas.width - radius);
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const maxY = Math.max(minY, this.canvas.height - radius);
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if (dot.x <= minX && dot.vx < 0) {
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dot.x = minX + (minX - dot.x);
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dot.vx = Math.abs(dot.vx);
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dot.baseVx = Math.abs(dot.baseVx);
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} else if (dot.x >= maxX && dot.vx > 0) {
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dot.x = maxX - (dot.x - maxX);
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dot.vx = -Math.abs(dot.vx);
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dot.baseVx = -Math.abs(dot.baseVx);
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}
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if (dot.y <= minY && dot.vy < 0) {
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dot.y = minY + (minY - dot.y);
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dot.vy = Math.abs(dot.vy);
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dot.baseVy = Math.abs(dot.baseVy);
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} else if (dot.y >= maxY && dot.vy > 0) {
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dot.y = maxY - (dot.y - maxY);
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dot.vy = -Math.abs(dot.vy);
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dot.baseVy = -Math.abs(dot.baseVy);
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}
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// A large pointer impulse can overshoot both edges by more than
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// one frame, so clamp after reflecting the position.
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dot.x = Math.max(minX, Math.min(maxX, dot.x));
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dot.y = Math.max(minY, Math.min(maxY, dot.y));
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});
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}
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drawDots() {
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this.dots.forEach(dot => {
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const isConnected = dot.connectionCount > 0;
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this.ctx.beginPath();
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this.ctx.arc(dot.x, dot.y, dot.size / 2, 0, Math.PI * 2);
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this.ctx.fillStyle = isConnected ? this.config.colors.dotConnected : this.config.colors.dotDefault;
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this.ctx.globalAlpha = dot.opacity;
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this.ctx.shadowBlur = 6;
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this.ctx.shadowColor = isConnected ? this.config.colors.dotConnectedGlow : this.config.colors.dotDefaultGlow;
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this.ctx.fill();
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});
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this.ctx.globalAlpha = 1;
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this.ctx.shadowBlur = 0;
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}
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createConnection(dot1, dot2) {
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if (this.connections.length >= this.config.maxConnections) return;
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dot1.connectionCount++;
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dot2.connectionCount++;
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this.connections.push({
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dot1: dot1,
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dot2: dot2,
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startTime: Date.now(),
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duration: Math.random() * (this.config.connectionDuration.max - this.config.connectionDuration.min) + this.config.connectionDuration.min
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});
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}
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updateConnections() {
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this.connections = this.connections.filter(conn => {
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const elapsed = Date.now() - conn.startTime;
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if (elapsed > conn.duration) {
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conn.dot1.connectionCount--;
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conn.dot2.connectionCount--;
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return false;
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}
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return true;
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});
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}
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drawConnections() {
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this.connections.forEach(conn => {
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const { dot1, dot2, startTime, duration } = conn;
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const elapsed = Date.now() - startTime;
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const opacity = Math.min(1, elapsed / 500);
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const gradient = this.ctx.createLinearGradient(dot1.x, dot1.y, dot2.x, dot2.y);
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gradient.addColorStop(0, this.config.colors.connection.start);
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gradient.addColorStop(0.5, this.config.colors.connection.middle);
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gradient.addColorStop(1, this.config.colors.connection.end);
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this.ctx.beginPath();
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this.ctx.moveTo(dot1.x, dot1.y);
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this.ctx.lineTo(dot2.x, dot2.y);
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this.ctx.strokeStyle = gradient;
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this.ctx.lineWidth = 2;
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this.ctx.globalAlpha = opacity;
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const pulse = (Math.sin((elapsed / 2000) * Math.PI * 2) + 1) / 2;
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this.ctx.shadowBlur = 4 + pulse * 6;
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this.ctx.shadowColor = 'rgba(118, 75, 162, 0.5)';
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this.ctx.stroke();
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});
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this.ctx.globalAlpha = 1;
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this.ctx.shadowBlur = 0;
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}
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tryCreateConnections() {
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for (let i = 0; i < this.dots.length; i++) {
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for (let j = i + 1; j < this.dots.length; j++) {
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if (Math.random() < this.config.connectionChance) {
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const dot1 = this.dots[i];
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const dot2 = this.dots[j];
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const dx = dot2.x - dot1.x;
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const dy = dot2.y - dot1.y;
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const distance = Math.sqrt(dx * dx + dy * dy);
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if (distance < 150 && distance > 30) {
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const alreadyConnected = this.connections.some(conn =>
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(conn.dot1 === dot1 && conn.dot2 === dot2) ||
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(conn.dot1 === dot2 && conn.dot2 === dot1)
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);
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if (!alreadyConnected) {
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this.createConnection(dot1, dot2);
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}
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}
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}
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}
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}
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}
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animate() {
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this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
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if (!this.prefersReducedMotion) {
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this.updateDots();
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this.updateConnections();
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this.tryCreateConnections();
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}
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this.drawConnections();
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this.drawDots();
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this.rafId = requestAnimationFrame(() => this.animate());
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}
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}
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document.addEventListener('DOMContentLoaded', () => {
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new MatrixBackground();
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});
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