var SCREEN_WIDTH = window.innerWidt

var SCREEN_WIDTH = window.innerWidth,
SCREEN_HEIGHT = window.innerHeight,
mousePos = {
x: 400,
y: 300
},

// create canvas
canvas = document.createElement('canvas'),
context = canvas.getContext('2d'),
particles = [],
rockets = [],
MAX_PARTICLES = 400,
colorCode = 0;

// init
$(document).ready(function() {
document.body.appendChild(canvas);
canvas.width = SCREEN_WIDTH;
canvas.height = SCREEN_HEIGHT;
setInterval(launch, 800);
setInterval(loop, 1000 / 50);
});

// update mouse position
$(document).mousemove(function(e) {
e.preventDefault();
mousePos = {
x: e.clientX,
y: e.clientY
};
});

// launch more rockets!!!
$(document).mousedown(function(e) {
for (var i = 0; i < 5; i++) {
launchFrom(Math.random() * SCREEN_WIDTH * 2 / 3 + SCREEN_WIDTH / 6);
}
});

function launch() {
launchFrom(mousePos.x);
}

function launchFrom(x) {
if (rockets.length < 10) {
var rocket = new Rocket(x);
rocket.explosionColor = Math.floor(Math.random() * 360 / 10) * 10;
rocket.vel.y = Math.random() * -3 - 4;
rocket.vel.x = Math.random() * 6 - 3;
rocket.size = 8;
rocket.shrink = 0.999;
rocket.gravity = 0.01;
rockets.push(rocket);
}
}

function loop() {
// update screen size
if (SCREEN_WIDTH != window.innerWidth) {
canvas.width = SCREEN_WIDTH = window.innerWidth;
}
if (SCREEN_HEIGHT != window.innerHeight) {
canvas.height = SCREEN_HEIGHT = window.innerHeight;
}

// clear canvas
context.fillStyle = "rgba(0, 0, 0, 0.05)";
context.fillRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

var existingRockets = [];

for (var i = 0; i < rockets.length; i++) {
// update and render
rockets[i].update();
rockets[i].render(context);

// calculate distance with Pythagoras
var distance = Math.sqrt(Math.pow(mousePos.x - rockets[i].pos.x, 2) + Math.pow(mousePos.y - rockets[i].pos.y, 2));

// random chance of 1% if rockets is above the middle
var randomChance = rockets[i].pos.y < (SCREEN_HEIGHT * 2 / 3) ? (Math.random() * 100 = 0 || distance < 50 || randomChance) {
rockets[i].explode();
} else {
existingRockets.push(rockets[i]);
}
}

rockets = existingRockets;

var existingParticles = [];

for (var i = 0; i < particles.length; i++) {
particles[i].update();

// render and save particles that can be rendered
if (particles[i].exists()) {
particles[i].render(context);
existingParticles.push(particles[i]);
}
}

// update array with existing particles - old particles should be garbage collected
particles = existingParticles;

while (particles.length > MAX_PARTICLES) {
particles.shift();
}
}

function Particle(pos) {
this.pos = {
x: pos ? pos.x : 0,
y: pos ? pos.y : 0
};
this.vel = {
x: 0,
y: 0
};
this.shrink = .97;
this.size = 2;

this.resistance = 1;
this.gravity = 0;

this.flick = false;

this.alpha = 1;
this.fade = 0;
this.color = 0;
}

Particle.prototype.update = function() {
// apply resistance
this.vel.x *= this.resistance;
this.vel.y *= this.resistance;

// gravity down
this.vel.y += this.gravity;

// update position based on speed
this.pos.x += this.vel.x;
this.pos.y += this.vel.y;

// shrink
this.size *= this.shrink;

// fade out
this.alpha -= this.fade;
};

Particle.prototype.render = function(c) {
if (!this.exists()) {
return;
}

c.save();

c.globalCompositeOperation = 'lighter';

var x = this.pos.x,
y = this.pos.y,
r = this.size / 2;

var gradient = c.createRadialGradient(x, y, 0.1, x, y, r);
gradient.addColorStop(0.1, "rgba(255,255,255," + this.alpha + ")");
gradient.addColorStop(0.8, "hsla(" + this.color + ", 100%, 50%, " + this.alpha + ")");
gradient.addColorStop(1, "hsla(" + this.color + ", 100%, 50%, 0.1)");

c.fillStyle = gradient;

c.beginPath();
c.arc(this.pos.x, this.pos.y, this.flick ? Math.random() * this.size : this.size, 0, Math.PI * 2, true);
c.closePath();
c.fill();

c.restore();
};

Particle.prototype.exists = function() {
return this.alpha >= 0.1 && this.size >= 1;
};

function Rocket(x) {
Particle.apply(this, [{
x: x,
y: SCREEN_HEIGHT}]);

this.explosionColor = 0;
}

Rocket.prototype = new Particle();
Rocket.prototype.constructor = Rocket;

Rocket.prototype.explode = function() {
var count = Math.random() * 10 + 80;

for (var i = 0; i < count; i++) {
var particle = new Particle(this.pos);
var angle = Math.random() * Math.PI * 2;

// emulate 3D effect by using cosine and put more particles in the middle
var speed = Math.cos(Math.random() * Math.PI / 2) * 15;

particle.vel.x = Math.cos(angle) * speed;
particle.vel.y = Math.sin(angle) * speed;

particle.size = 10;

particle.gravity = 0.2;
particle.resistance = 0.92;
particle.shrink = Math.random() * 0.05 + 0.93;

particle.flick = true;
particle.color = this.explosionColor;

particles.push(particle);
}
};

Rocket.prototype.render = function(c) {
if (!this.exists()) {
return;
}

c.save();

c.globalCompositeOperation = 'lighter';

var x = this.pos.x,
y = this.pos.y,
r = this.size / 2;

var gradient = c.createRadialGradient(x, y, 0.1, x, y, r);
gradient.addColorStop(0.1, "rgba(255, 255, 255 ," + this.alpha + ")");
gradient.addColorStop(1, "rgba(0, 0, 0, " + this.alpha + ")");

c.fillStyle = gradient;

c.beginPath();
c.arc(this.pos.x, this.pos.y, this.flick ? Math.random() * this.size / 2 + this.size / 2 : this.size, 0, Math.PI * 2, true);
c.closePath();
c.fill();

c.restore();
};

Kết quả (Việt) 1:

var SCREEN_WIDTH = window.innerWidth, SCREEN_HEIGHT = window.innerHeight, mousePos = { x: 400, y: 300 }, // create canvas canvas = document.createElement('canvas'), context = canvas.getContext('2d'), particles = [], rockets = [], MAX_PARTICLES = 400, colorCode = 0;// init$(document).ready(function() { document.body.appendChild(canvas); canvas.width = SCREEN_WIDTH; canvas.height = SCREEN_HEIGHT; setInterval(launch, 800); setInterval(loop, 1000 / 50);});// update mouse position$(document).mousemove(function(e) { e.preventDefault(); mousePos = { x: e.clientX, y: e.clientY };});// launch more rockets!!!$(document).mousedown(function(e) { for (var i = 0; i < 5; i++) { launchFrom(Math.random() * SCREEN_WIDTH * 2 / 3 + SCREEN_WIDTH / 6); }});function launch() { launchFrom(mousePos.x);}function launchFrom(x) { if (rockets.length < 10) { var rocket = new Rocket(x); rocket.explosionColor = Math.floor(Math.random() * 360 / 10) * 10; rocket.vel.y = Math.random() * -3 - 4; rocket.vel.x = Math.random() * 6 - 3; rocket.size = 8; rocket.shrink = 0.999; rocket.gravity = 0.01; rockets.push(rocket); }}function loop() { // update screen size if (SCREEN_WIDTH != window.innerWidth) { canvas.width = SCREEN_WIDTH = window.innerWidth; } if (SCREEN_HEIGHT != window.innerHeight) { canvas.height = SCREEN_HEIGHT = window.innerHeight; } // clear canvas context.fillStyle = "rgba(0, 0, 0, 0.05)"; context.fillRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
var existingRockets = [];

for (var i = 0; i < rockets.length; i++) {
// update and render
rockets[i].update();
rockets[i].render(context);

// calculate distance with Pythagoras
var distance = Math.sqrt(Math.pow(mousePos.x - rockets[i].pos.x, 2) + Math.pow(mousePos.y - rockets[i].pos.y, 2));

// random chance of 1% if rockets is above the middle
var randomChance = rockets[i].pos.y < (SCREEN_HEIGHT * 2 / 3) ? (Math.random() * 100 <= 1) : false;

/* Explosion rules
- 80% of screen
- going down
- close to the mouse
- 1% chance of random explosion
*/
if (rockets[i].pos.y < SCREEN_HEIGHT / 5 || rockets[i].vel.y >= 0 || distance < 50 || randomChance) {
rockets[i].explode();
} else {
existingRockets.push(rockets[i]);
}
}

rockets = existingRockets;

var existingParticles = [];

for (var i = 0; i < particles.length; i++) {
particles[i].update();

// render and save particles that can be rendered
if (particles[i].exists()) {
particles[i].render(context);
existingParticles.push(particles[i]);
}
}

// update array with existing particles - old particles should be garbage collected
particles = existingParticles;

while (particles.length > MAX_PARTICLES) {
particles.shift();
}
}

function Particle(pos) {
this.pos = {
x: pos ? pos.x : 0,
y: pos ? pos.y : 0
};
this.vel = {
x: 0,
y: 0
};
this.shrink = .97;
this.size = 2;

this.resistance = 1;
this.gravity = 0;

this.flick = false;

this.alpha = 1;
this.fade = 0;
this.color = 0;
}

Particle.prototype.update = function() {
// apply resistance
this.vel.x *= this.resistance;
this.vel.y *= this.resistance;

// gravity down
this.vel.y += this.gravity;

// update position based on speed
this.pos.x += this.vel.x;
this.pos.y += this.vel.y;

// shrink
this.size *= this.shrink;

// fade out
this.alpha -= this.fade;
};

Particle.prototype.render = function(c) {
if (!this.exists()) {
return;
}

c.save();

c.globalCompositeOperation = 'lighter';

var x = this.pos.x,
y = this.pos.y,
r = this.size / 2;

var gradient = c.createRadialGradient(x, y, 0.1, x, y, r);
gradient.addColorStop(0.1, "rgba(255,255,255," + this.alpha + ")");
gradient.addColorStop(0.8, "hsla(" + this.color + ", 100%, 50%, " + this.alpha + ")");
gradient.addColorStop(1, "hsla(" + this.color + ", 100%, 50%, 0.1)");

c.fillStyle = gradient;

c.beginPath();
c.arc(this.pos.x, this.pos.y, this.flick ? Math.random() * this.size : this.size, 0, Math.PI * 2, true);
c.closePath();
c.fill();

c.restore();
};

Particle.prototype.exists = function() {
return this.alpha >= 0.1 && this.size >= 1;
};

function Rocket(x) {
Particle.apply(this, [{
x: x,
y: SCREEN_HEIGHT}]);

this.explosionColor = 0;
}

Rocket.prototype = new Particle();
Rocket.prototype.constructor = Rocket;

Rocket.prototype.explode = function() {
var count = Math.random() * 10 + 80;

for (var i = 0; i < count; i++) {
var particle = new Particle(this.pos);
var angle = Math.random() * Math.PI * 2;

// emulate 3D effect by using cosine and put more particles in the middle
var speed = Math.cos(Math.random() * Math.PI / 2) * 15;

particle.vel.x = Math.cos(angle) * speed;
particle.vel.y = Math.sin(angle) * speed;

particle.size = 10;

particle.gravity = 0.2;
particle.resistance = 0.92;
particle.shrink = Math.random() * 0.05 + 0.93;

particle.flick = true;
particle.color = this.explosionColor;

particles.push(particle);
}
};

Rocket.prototype.render = function(c) {
if (!this.exists()) {
return;
}

c.save();

c.globalCompositeOperation = 'lighter';

var x = this.pos.x,
y = this.pos.y,
r = this.size / 2;

var gradient = c.createRadialGradient(x, y, 0.1, x, y, r);
gradient.addColorStop(0.1, "rgba(255, 255, 255 ," + this.alpha + ")");
gradient.addColorStop(1, "rgba(0, 0, 0, " + this.alpha + ")");

c.fillStyle = gradient;

c.beginPath();
c.arc(this.pos.x, this.pos.y, this.flick ? Math.random() * this.size / 2 + this.size / 2 : this.size, 0, Math.PI * 2, true);
c.closePath();
c.fill();

c.restore();
};

Kết quả (Việt) 2:

var SCREEN_WIDTH = window.innerWidth,
SCREEN_HEIGHT = window.innerHeight,
mousePos =
{x: 400,
y:
300}, // tạo ra vải canvas = document.createElement ('vải'), context = canvas.getContext ('2d') , hạt = [], tên lửa = [], MAX_PARTICLES = 400, Colorcode = 0; // init $ (document) .ready (function () {document.body.appendChild (vải); canvas.width = SCREEN_WIDTH; canvas. height = SCREEN_HEIGHT; setInterval (ra mắt, 800); setInterval (loop, 1000-1050);}); // vị trí cập nhật chuột $ (document) .mousemove (function (e) {e.preventDefault (); mousePos = {x : e.clientX, y: e.clientY};}); // khởi động nhiều tên lửa !!! $ (document) .mousedown (function (e) {for (var i = 0; i <5; i ++) {launchFrom (Math.random () * SCREEN_WIDTH * 2/3 + SCREEN_WIDTH / 6);}}); chức năng khởi động () {launchFrom (mousePos.x);} function launchFrom (x) {if (rockets.length <10) { var = tên lửa Rocket mới (x); rocket.explosionColor = Math.floor (Math.random () * 360/10) * 10; rocket.vel.y = Math.random () * -3 - 4; rocket.vel .x = Math.random () * 6-3; rocket.size = 8; rocket.shrink = 0,999; rocket.gravity = 0,01; rockets.push (tên lửa);}} chức năng loop () {// cập nhật kích thước màn hình if (SCREEN_WIDTH = window.innerWidth!) {canvas.width = SCREEN_WIDTH = window.innerWidth;} if (SCREEN_HEIGHT = window.innerHeight!) {canvas.height = SCREEN_HEIGHT = window.innerHeight;} // rõ ràng vải context.fillStyle = "rgba (0, 0, 0, 0.05)"; context.fillRect (0, 0, SCREEN_WIDTH, SCREEN_HEIGHT); var existingRockets = []; for (var i = 0; i <rockets.length; i ++) {// cập nhật và đưa ra tên lửa [i] .update (); rocket [i] .render (context); // tính toán khoảng cách với Pythagoras var khoảng cách = Math.sqrt (Math.pow (mousePos.x - tên lửa [ i] .pos.x, 2) + Math.pow (mousePos.y - tên lửa [i] .pos.y, 2)); // cơ hội ngẫu nhiên 1% nếu tên lửa là ở trên giữa var randomChance = tên lửa [i ] .pos.y <(SCREEN_HEIGHT * 2/3)? (Math.random () * 100 <= 1): false; / * quy tắc Explosion - 80% của màn hình - đi xuống - gần với chuột - 1% cơ hội bùng nổ ngẫu nhiên * / if (tên lửa [i] .pos. y <SCREEN_HEIGHT / 5 || rocket [i] .vel.y> = 0 || khoảng cách <50 || randomChance) {tên lửa [i] .explode ();} else {existingRockets.push (tên lửa [i]); }} rocket = existingRockets; var existingParticles = []; for (var i = 0; i <particles.length; i ++) {hạt [i] .update (); // vẽ lại và lưu các hạt có thể được trả lại nếu (hạt [i] .exists ()) {hạt [i] .render (context); existingParticles.push (hạt [i]);}} // cập nhật mảng với các hạt hiện có - hạt cũ cần được thu gom rác thải hạt = existingParticles; trong khi (particles.length> MAX_PARTICLES) {particles.shift ();}} chức năng Particle (pos) {this.pos = {x: pos? pos.x: 0, y: pos? pos.y: 0}; this.vel = {x: 0, y: 0}; this.shrink = .97; this.size = 2; this.resistance = 1; this.gravity = 0; this.flick = false; this.alpha = 1; this.fade = 0; this.color = 0;} Particle.prototype.update = function () {// áp dụng kháng this.vel.x * = this.resistance; this.vel. y * = this.resistance; // trọng lực xuống this.vel.y + = this.gravity; // vị trí cập nhật dựa trên tốc độ this.pos.x + = this.vel.x; this.pos.y + = này .vel.y; // co this.size * = this.shrink; // phai ra this.alpha - = this.fade;}; = function Particle.prototype.render (c) {if (! this.exists ( )) {return;} c.save (); c.globalCompositeOperation = 'nhẹ'; var x = this.pos.x, y = this.pos.y, r = this.size / 2; var Gradient = c. createRadialGradient (x, y, 0,1, x, y, r); gradient.addColorStop (0,1, "rgba (255.255.255," + this.alpha + ")"); gradient.addColorStop (0,8, "HSLA (" + này. màu + ", 100%, 50%," + this.alpha + ")"); gradient.addColorStop (1, "HSLA (" + this.color + ", 100%, 50%, 0,1)"); c .fillStyle = gradient; c.beginPath (); c.arc (this.pos.x, this.pos.y, this.flick? Math.random () * this.size: this.size, 0, Math.PI * 2, true); c.closePath (); c.fill (); c.restore ();}; Particle.prototype.exists = function () {return this.alpha> = 0.1 && this.size> = 1;}; chức năng Rocket (x) {Particle.apply (this, [{x: x, y: SCREEN_HEIGHT}]); this.explosionColor = 0;} Rocket.prototype = new Particle (); Rocket.prototype.constructor = Rocket; Rocket.prototype.explode = function () {var count = Math.random () * 10 + 80; for (var i = 0 ; i <count; i ++) {var hạt = Particle mới (this.pos); góc var = Math.random () * Math.PI * 2; // chước hiệu ứng 3D bằng cách sử dụng cosin và đặt hạt hơn ở giữa var tốc độ = Math.cos (Math.random () * Math.PI / 2) * 15; particle.vel.x = Math.cos (góc) * Tốc độ; particle.vel.y = Math.sin (góc) * Tốc độ ; particle.size = 10; particle.gravity = 0,2; particle.resistance = 0,92; particle.shrink = Math.random () * 0,05 + 0,93; particle.flick = true; particle.color = this.explosionColor; particles.push (hạt);}}; Rocket.prototype.render = function (c) {nếu {(this.exists ()) return;} c.save (); c.globalCompositeOperation = 'nhẹ'; var x = này. pos.x, y = this.pos.y, r = this.size / 2; var Gradient = c.createRadialGradient (x, y, 0,1, x, y, r); gradient.addColorStop (0,1, "rgba (255 , 255, 255, "+ this.alpha +") "); gradient.addColorStop (1," rgba (0, 0, 0, "+ this.alpha +") "); c.fillStyle = gradient; c. beginPath (); c.arc (this.pos.x, this.pos.y, this.flick? Math.random () * this.size / 2 + this.size / 2: this.size, 0, Math.PI * 2, true); c.closePath (); c.fill (); c.restore () ;};