Ống kính OLYMPUS - Máy Ảnh Việt Nam - Vì lợi ích khách hàng

Máy ảnh

Ống kính

Máy cũ giá tốt

Setup phòng studio

Action camera

Flycam

Thiết bị phòng studio

Phụ kiện máy ảnh

Máy quay phim

(function () { const requestAnimFrame = (function () { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function (callback) { window.setTimeout(callback, 1000 / 60); }; })(); const hieuUngPhaoHoa = { canvas: document.getElementById('hieuUngPhaoHoa__canvas'), ctx: null, cw: window.innerWidth, ch: window.innerHeight, fireworks: [], particles: [], colors: [0, 60, 300], // Mảng các màu hue: 0, timerTotal: 30, // Giảm thời gian giữa các lần bắn timerTick: 0, isActive: true, // Biến để kiểm soát trạng thái hoạt động init: function () { this.ctx = this.canvas.getContext('2d'); this.canvas.width = this.cw; this.canvas.height = this.ch; this.loop(); // Tự động dừng sau 5 giây setTimeout(() => { this.isActive = false; }, 5000); }, calculateDistance: function (p1x, p1y, p2x, p2y) { const xDistance = p1x - p2x; const yDistance = p1y - p2y; return Math.sqrt(Math.pow(xDistance, 2) + Math.pow(yDistance, 2)); }, random: function (min, max) { return Math.random() * (max - min) + min; }, createParticles: function (x, y) { let particleCount = 30; // Chọn màu ngẫu nhiên từ mảng this.hue = this.colors[Math.floor(Math.random() * this.colors.length)]; while (particleCount--) { this.particles.push(new Particle(x, y, this)); } }, // Main loop loop: function () { if (!this.isActive && this.fireworks.length === 0 && this.particles.length === 0) { return; // Dừng animation khi hết pháo hoa } requestAnimFrame(this.loop.bind(this)); this.hue += 0.5; this.ctx.globalCompositeOperation = 'destination-out'; this.ctx.fillStyle = 'rgba(0, 0, 0, 0.5)'; this.ctx.fillRect(0, 0, this.cw, this.ch); this.ctx.globalCompositeOperation = 'lighter'; let i = this.fireworks.length; while (i--) { this.fireworks[i].draw(); this.fireworks[i].update(i); } i = this.particles.length; while (i--) { this.particles[i].draw(); this.particles[i].update(i); } // Tự động bắn pháo hoa nếu đang hoạt động if (this.isActive && this.timerTick >= this.timerTotal) { this.fireworks.push(new Firework( this.cw / 2, this.ch, this.random(0, this.cw), this.random(0, this.ch / 2), this )); this.timerTick = 0; } else { this.timerTick++; } } }; // Firework class class Firework { constructor(sx, sy, tx, ty, main) { this.main = main; this.x = sx; this.y = sy; this.sx = sx; this.sy = sy; this.tx = tx; this.ty = ty; this.distanceToTarget = main.calculateDistance(sx, sy, tx, ty); this.distanceTraveled = 0; this.coordinates = []; this.coordinateCount = 3; while (this.coordinateCount--) { this.coordinates.push([this.x, this.y]); } this.angle = Math.atan2(ty - sy, tx - sx); this.speed = 2; this.acceleration = 1.05; this.brightness = main.random(50, 70); this.targetRadius = 1; } update(index) { this.coordinates.pop(); this.coordinates.unshift([this.x, this.y]); if (this.targetRadius < 8) { this.targetRadius += 0.3; } else { this.targetRadius = 1; } this.speed *= this.acceleration; const vx = Math.cos(this.angle) * this.speed; const vy = Math.sin(this.angle) * this.speed; this.distanceTraveled = this.main.calculateDistance( this.sx, this.sy, this.x + vx, this.y + vy ); if (this.distanceTraveled >= this.distanceToTarget) { this.main.createParticles(this.tx, this.ty); this.main.fireworks.splice(index, 1); } else { this.x += vx; this.y += vy; } } draw() { this.main.ctx.beginPath(); this.main.ctx.moveTo( this.coordinates[this.coordinates.length - 1][0], this.coordinates[this.coordinates.length - 1][1] ); this.main.ctx.lineTo(this.x, this.y); this.main.ctx.strokeStyle = `hsl(${this.main.hue}, 100%, ${this.brightness}%)`; this.main.ctx.stroke(); } } // Particle class class Particle { constructor(x, y, main) { this.main = main; this.x = x; this.y = y; this.coordinates = []; this.coordinateCount = 5; while (this.coordinateCount--) { this.coordinates.push([this.x, this.y]); } this.angle = main.random(0, Math.PI * 2); this.speed = main.random(1, 10); this.friction = 0.95; this.gravity = 1; this.hue = main.random(main.hue - 20, main.hue + 20); this.brightness = main.random(50, 80); this.alpha = 1; this.decay = main.random(0.015, 0.03); } update(index) { this.coordinates.pop(); this.coordinates.unshift([this.x, this.y]); this.speed *= this.friction; this.x += Math.cos(this.angle) * this.speed; this.y += Math.sin(this.angle) * this.speed + this.gravity; this.alpha -= this.decay; if (this.alpha <= this.decay) { this.main.particles.splice(index, 1); } } draw() { this.main.ctx.beginPath(); this.main.ctx.moveTo( this.coordinates[this.coordinates.length - 1][0], this.coordinates[this.coordinates.length - 1][1] ); this.main.ctx.lineTo(this.x, this.y); this.main.ctx.strokeStyle = `hsla(${this.hue}, 100%, ${this.brightness}%, ${this.alpha})`; this.main.ctx.stroke(); } } // Khởi chạy khi trang load xong window.addEventListener('load', () => hieuUngPhaoHoa.init()); })();