console
var Fire = function () {
this.canvas = document.getElementById('fire');
this.ctx = this.canvas.getContext('2d');
this.canvas.height = window.innerHeight;
this.canvas.width = window.innerWidth;
this.aFires = [];
this.aSpark = [];
this.aSpark2 = [];
this.mouse = {
x: this.canvas.width * .5,
y: this.canvas.height * .75,
}
this.init();
}
Fire.prototype.init = function () {
this.canvas.addEventListener('mousemove', this.updateMouse.bind(this), false);
}
Fire.prototype.run = function () {
this.update();
this.draw();
if (this.bRuning)
requestAnimationFrame(this.run.bind(this));
}
Fire.prototype.start = function () {
this.bRuning = true;
this.run();
}
Fire.prototype.stop = function () {
this.bRuning = false;
}
Fire.prototype.update = function () {
this.aFires.push(new Flame(this.mouse));
this.aSpark.push(new Spark(this.mouse));
this.aSpark2.push(new Spark(this.mouse));
for (var i = this.aFires.length - 1; i >= 0; i--) {
if (this.aFires[i].alive)
this.aFires[i].update();
else
this.aFires.splice(i, 1);
}
for (var i = this.aSpark.length - 1; i >= 0; i--) {
if (this.aSpark[i].alive)
this.aSpark[i].update();
else
this.aSpark.splice(i, 1);
}
for (var i = this.aSpark2.length - 1; i >= 0; i--) {
if (this.aSpark2[i].alive)
this.aSpark2[i].update();
else
this.aSpark2.splice(i, 1);
}
}
Fire.prototype.draw = function () {
this.ctx.globalCompositeOperation = "source-over";
this.ctx.fillStyle = "rgba( 15, 5, 2, 1 )";
this.ctx.fillRect(0, 0, window.innerWidth, window.innerHeight);
this.grd = this.ctx.createRadialGradient(this.mouse.x, this.mouse.y - 200, 200, this.mouse.x, this.mouse.y -
100, 0);
this.grd.addColorStop(0, "rgb( 15, 5, 2 )");
this.grd.addColorStop(1, "rgb( 30, 10, 2 )");
this.ctx.beginPath();
this.ctx.arc(this.mouse.x, this.mouse.y - 100, 200, 0, 2 * Math.PI);
this.ctx.fillStyle = this.grd;
this.ctx.fill();
this.ctx.font = "15em Amatic SC";
this.ctx.textAlign = "center";
this.ctx.strokeStyle = "rgb(50, 20, 0)";
this.ctx.fillStyle = "rgb(120, 10, 0)";
this.ctx.lineWidth = 2;
this.ctx.strokeText("Fire", this.canvas.width / 2, this.canvas.height * .72);
this.ctx.fillText("Fire", this.canvas.width / 2, this.canvas.height * .72);
this.ctx.globalCompositeOperation = "overlay";
for (var i = this.aFires.length - 1; i >= 0; i--) {
this.aFires[i].draw(this.ctx);
}
this.ctx.globalCompositeOperation = "soft-light";
for (var i = this.aSpark.length - 1; i >= 0; i--) {
if ((i % 2) === 0)
this.aSpark[i].draw(this.ctx);
}
this.ctx.globalCompositeOperation = "color-dodge";
for (var i = this.aSpark2.length - 1; i >= 0; i--) {
this.aSpark2[i].draw(this.ctx);
}
}
Fire.prototype.updateMouse = function (e) {
this.mouse.x = e.clientX;
this.mouse.y = e.clientY;
}
var Flame = function (mouse) {
this.cx = mouse.x;
this.cy = mouse.y;
this.x = rand(this.cx - 25, this.cx + 25);
this.y = rand(this.cy - 5, this.cy + 5);
this.vy = rand(1, 3);
this.vx = rand(-1, 1);
this.r = rand(20, 30);
this.life = rand(3, 6);
this.alive = true;
this.c = {
h: Math.floor(rand(2, 40)),
s: 100,
l: rand(80, 100),
a: 0,
ta: rand(0.8, 0.9)
}
}
Flame.prototype.update = function () {
this.y -= this.vy;
this.vy += 0.05;
this.x += this.vx;
if (this.x < this.cx)
this.vx += 0.1;
else
this.vx -= 0.1;
if (this.r > 0)
this.r -= 0.1;
if (this.r <= 0)
this.r = 0;
this.life -= 0.15;
if (this.life <= 0) {
this.c.a -= 0.05;
if (this.c.a <= 0)
this.alive = false;
} else if (this.life > 0 && this.c.a < this.c.ta) {
this.c.a += .08;
}
}
Flame.prototype.draw = function (ctx) {
ctx.beginPath();
ctx.arc(this.x, this.y, this.r * 3, 0, 2 * Math.PI);
ctx.fillStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + (this.c.a / 20) + ")";
ctx.fill();
ctx.beginPath();
ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI);
ctx.fillStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + this.c.a + ")";
ctx.fill();
}
var Spark = function (mouse) {
this.cx = mouse.x;
this.cy = mouse.y;
this.x = rand(this.cx - 40, this.cx + 40);
this.y = rand(this.cy, this.cy + 5);
this.lx = this.x;
this.ly = this.y;
this.vy = rand(1, 3);
this.vx = rand(-4, 4);
this.r = rand(0, 1);
this.life = rand(4, 5);
this.alive = true;
this.c = {
h: Math.floor(rand(2, 40)),
s: 100,
l: rand(40, 100),
a: rand(0.8, 0.9)
}
}
Spark.prototype.update = function () {
this.lx = this.x;
this.ly = this.y;
this.y -= this.vy;
this.x += this.vx;
if (this.x < this.cx)
this.vx += 0.2;
else
this.vx -= 0.2;
this.vy += 0.08;
this.life -= 0.1;
if (this.life <= 0) {
this.c.a -= 0.05;
if (this.c.a <= 0)
this.alive = false;
}
}
Spark.prototype.draw = function (ctx) {
ctx.beginPath();
ctx.moveTo(this.lx, this.ly);
ctx.lineTo(this.x, this.y);
ctx.strokeStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + (this.c.a / 2) + ")";
ctx.lineWidth = this.r * 2;
ctx.lineCap = 'round';
ctx.stroke();
ctx.closePath();
ctx.beginPath();
ctx.moveTo(this.lx, this.ly);
ctx.lineTo(this.x, this.y);
ctx.strokeStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + this.c.a + ")";
ctx.lineWidth = this.r;
ctx.stroke();
ctx.closePath();
}
rand = function (min, max) {
return Math.random() * (max - min) + min;
};
onresize = function () {
oCanvas.canvas.width = window.innerWidth;
oCanvas.canvas.height = window.innerHeight;
};
var oCanvas;
init = function () {
oCanvas = new Fire();
oCanvas.start();
}
window.onload = init;
<canvas id="fire"></canvas>