跨年代码 烟花html
跨年代码 烟花html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>烟花代码</title>
<style>
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
ul,
li {
text-indent: 0;
text-decoration: none;
margin: 0;
padding: 0;
}
img {
border: 0;
}
body {
background: url("https://cdn-static-devbit.csdn.net/devbit-static/img/city_bg.jpeg");
background-size: cover;
background-repeat: no-repeat;
color: #999;
font: 100%/18px helvetica, arial, sans-serif;
}
canvas {
cursor: crosshair;
display: block;
left: 0;
position: absolute;
top: 0;
z-index: 20;
}
</style>
</head>
<body>
<script
type="text/javascript"
src="https://cdn-static-devbit.csdn.net/devbit-static/js/jquery-3.3.1.min.js"
></script>
<script type="text/javascript">
$(function () {
var Fireworks = function () {
var self = this;
var rand = function (rMi, rMa) {
return ~~(Math.random() * (rMa - rMi + 1) + rMi);
};
var hitTest = function (x1, y1, w1, h1, x2, y2, w2, h2) {
return !(
x1 + w1 < x2 ||
x2 + w2 < x1 ||
y1 + h1 < y2 ||
y2 + h2 < y1
);
};
window.requestAnimFrame = (function () {
return (
window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (a) {
window.setTimeout(a, 1e3 / 60);
}
);
})();
self.init = function () {
self.canvas = document.createElement("canvas");
self.canvas.width = self.cw = $(window).innerWidth();
self.canvas.height = self.ch = $(window).innerHeight();
self.particles = [];
self.partCount = 150;
self.fireworks = [];
self.mx = self.cw / 2;
self.my = self.ch / 2;
self.currentHue = 30;
self.partSpeed = 5;
self.partSpeedVariance = 10;
self.partWind = 50;
self.partFriction = 5;
self.partGravity = 1;
self.hueMin = 0;
self.hueMax = 360;
self.fworkSpeed = 4;
self.fworkAccel = 10;
self.hueVariance = 30;
self.flickerDensity = 25;
self.showShockwave = true;
self.showTarget = false;
self.clearAlpha = 25;
$(document.body).append(self.canvas);
self.ctx = self.canvas.getContext("2d");
self.ctx.lineCap = "round";
self.ctx.lineJoin = "round";
self.lineWidth = 1;
self.bindEvents();
self.canvasLoop();
self.canvas.onselectstart = function () {
return false;
};
};
self.createParticles = function (x, y, hue) {
var countdown = self.partCount;
while (countdown--) {
var newParticle = {
x: x,
y: y,
coordLast: [
{ x: x, y: y },
{ x: x, y: y },
{ x: x, y: y }
],
angle: rand(0, 360),
speed: rand(
self.partSpeed - self.partSpeedVariance <= 0
? 1
: self.partSpeed - self.partSpeedVariance,
self.partSpeed + self.partSpeedVariance
),
friction: 1 - self.partFriction / 100,
gravity: self.partGravity / 2,
hue: rand(hue - self.hueVariance, hue + self.hueVariance),
brightness: rand(50, 80),
alpha: rand(40, 100) / 100,
decay: rand(10, 50) / 1000,
wind: (rand(0, self.partWind) - self.partWind / 2) / 25,
lineWidth: self.lineWidth
};
self.particles.push(newParticle);
}
};
self.updateParticles = function () {
var i = self.particles.length;
while (i--) {
var p = self.particles[i];
var radians = (p.angle * Math.PI) / 180;
var vx = Math.cos(radians) * p.speed;
var vy = Math.sin(radians) * p.speed;
p.speed *= p.friction;
p.coordLast[2].x = p.coordLast[1].x;
p.coordLast[2].y = p.coordLast[1].y;
p.coordLast[1].x = p.coordLast[0].x;
p.coordLast[1].y = p.coordLast[0].y;
p.coordLast[0].x = p.x;
p.coordLast[0].y = p.y;
p.x += vx;
p.y += vy;
p.y += p.gravity;
p.angle += p.wind;
p.alpha -= p.decay;
if (
!hitTest(
0,
0,
self.cw,
self.ch,
p.x - p.radius,
p.y - p.radius,
p.radius * 2,
p.radius * 2
) ||
p.alpha < 0.05
) {
self.particles.splice(i, 1);
}
}
};
self.drawParticles = function () {
var i = self.particles.length;
while (i--) {
var p = self.particles[i];
var coordRand = rand(1, 3) - 1;
self.ctx.beginPath();
self.ctx.moveTo(
Math.round(p.coordLast[coordRand].x),
Math.round(p.coordLast[coordRand].y)
);
self.ctx.lineTo(Math.round(p.x), Math.round(p.y));
self.ctx.closePath();
self.ctx.strokeStyle =
"hsla(" +
p.hue +
", 100%, " +
p.brightness +
"%, " +
p.alpha +
")";
self.ctx.stroke();
if (self.flickerDensity > 0) {
var inverseDensity = 50 - self.flickerDensity;
if (rand(0, inverseDensity) === inverseDensity) {
self.ctx.beginPath();
self.ctx.arc(
Math.round(p.x),
Math.round(p.y),
rand(p.lineWidth, p.lineWidth + 3) / 2,
0,
Math.PI * 2,
false
);
self.ctx.closePath();
var randAlpha = rand(50, 100) / 100;
self.ctx.fillStyle =
"hsla(" +
p.hue +
", 100%, " +
p.brightness +
"%, " +
randAlpha +
")";
self.ctx.fill();
}
}
}
};
self.createFireworks = function (startX, startY, targetX, targetY) {
var newFirework = {
x: startX,
y: startY,
startX: startX,
startY: startY,
hitX: false,
hitY: false,
coordLast: [
{ x: startX, y: startY },
{ x: startX, y: startY },
{ x: startX, y: startY }
],
targetX: targetX,
targetY: targetY,
speed: self.fworkSpeed,
angle: Math.atan2(targetY - startY, targetX - startX),
shockwaveAngle:
Math.atan2(targetY - startY, targetX - startX) +
90 * (Math.PI / 180),
acceleration: self.fworkAccel / 100,
hue: self.currentHue,
brightness: rand(50, 80),
alpha: rand(50, 100) / 100,
lineWidth: self.lineWidth
};
self.fireworks.push(newFirework);
};
self.updateFireworks = function () {
var i = self.fireworks.length;
while (i--) {
var f = self.fireworks[i];
self.ctx.lineWidth = f.lineWidth;
(vx = Math.cos(f.angle) * f.speed),
(vy = Math.sin(f.angle) * f.speed);
f.speed *= 1 + f.acceleration;
f.coordLast[2].x = f.coordLast[1].x;
f.coordLast[2].y = f.coordLast[1].y;
f.coordLast[1].x = f.coordLast[0].x;
f.coordLast[1].y = f.coordLast[0].y;
f.coordLast[0].x = f.x;
f.coordLast[0].y = f.y;
if (f.startX >= f.targetX) {
if (f.x + vx <= f.targetX) {
f.x = f.targetX;
f.hitX = true;
} else {
f.x += vx;
}
} else {
if (f.x + vx >= f.targetX) {
f.x = f.targetX;
f.hitX = true;
} else {
f.x += vx;
}
}
if (f.startY >= f.targetY) {
if (f.y + vy <= f.targetY) {
f.y = f.targetY;
f.hitY = true;
} else {
f.y += vy;
}
} else {
if (f.y + vy >= f.targetY) {
f.y = f.targetY;
f.hitY = true;
} else {
f.y += vy;
}
}
if (f.hitX && f.hitY) {
self.createParticles(f.targetX, f.targetY, f.hue);
self.fireworks.splice(i, 1);
}
}
};
self.drawFireworks = function () {
var i = self.fireworks.length;
self.ctx.globalCompositeOperation = "lighter";
while (i--) {
var f = self.fireworks[i];
self.ctx.lineWidth = f.lineWidth;
var coordRand = rand(1, 3) - 1;
self.ctx.beginPath();
self.ctx.moveTo(
Math.round(f.coordLast[coordRand].x),
Math.round(f.coordLast[coordRand].y)
);
self.ctx.lineTo(Math.round(f.x), Math.round(f.y));
self.ctx.closePath();
self.ctx.strokeStyle =
"hsla(" +
f.hue +
", 100%, " +
f.brightness +
"%, " +
f.alpha +
")";
self.ctx.stroke();
if (self.showTarget) {
self.ctx.save();
self.ctx.beginPath();
self.ctx.arc(
Math.round(f.targetX),
Math.round(f.targetY),
rand(1, 8),
0,
Math.PI * 2,
false
);
self.ctx.closePath();
self.ctx.lineWidth = 1;
self.ctx.stroke();
self.ctx.restore();
}
if (self.showShockwave) {
self.ctx.save();
self.ctx.translate(Math.round(f.x), Math.round(f.y));
self.ctx.rotate(f.shockwaveAngle);
self.ctx.beginPath();
self.ctx.arc(0, 0, 1 * (f.speed / 5), 0, Math.PI, true);
self.ctx.strokeStyle =
"hsla(" +
f.hue +
", 100%, " +
f.brightness +
"%, " +
rand(25, 60) / 100 +
")";
self.ctx.lineWidth = f.lineWidth;
self.ctx.stroke();
self.ctx.restore();
}
}
};
self.bindEvents = function () {
$(window).on("resize", function () {
clearTimeout(self.timeout);
self.timeout = setTimeout(function () {
self.canvas.width = self.cw = $(window).innerWidth();
self.canvas.height = self.ch = $(window).innerHeight();
self.ctx.lineCap = "round";
self.ctx.lineJoin = "round";
}, 100);
});
$(self.canvas).on("mousedown", function (e) {
self.mx = e.pageX - self.canvas.offsetLeft;
self.my = e.pageY - self.canvas.offsetTop;
self.currentHue = rand(self.hueMin, self.hueMax);
self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
$(self.canvas).on("mousemove.fireworks", function (e) {
self.mx = e.pageX - self.canvas.offsetLeft;
self.my = e.pageY - self.canvas.offsetTop;
self.currentHue = rand(self.hueMin, self.hueMax);
self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
});
});
$(self.canvas).on("mouseup", function (e) {
$(self.canvas).off("mousemove.fireworks");
});
};
self.clear = function () {
self.particles = [];
self.fireworks = [];
self.ctx.clearRect(0, 0, self.cw, self.ch);
};
self.canvasLoop = function () {
requestAnimFrame(self.canvasLoop, self.canvas);
self.ctx.globalCompositeOperation = "destination-out";
self.ctx.fillStyle = "rgba(0,0,0," + self.clearAlpha / 100 + ")";
self.ctx.fillRect(0, 0, self.cw, self.ch);
self.updateFireworks();
self.updateParticles();
self.drawFireworks();
self.drawParticles();
};
self.init();
};
var fworks = new Fireworks();
});
</script>
</body>
</html>效果如下：
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