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好的,所以我有一个列表 nav
可以导航到带有旋转木马幻灯片的某个幻灯片,smoke.js 在访问该站点时加载并自动启动,这正是我想要的,但是当他们单击“主页”按钮以外的任何 nav
按钮,我需要它来结束烟雾动画,如果他们单击主页按钮返回主页幻灯片,我需要它来重新启动烟雾机。我该怎么做?
这里是 smoke.js 的代码笔 codepen :
var smokemachine = function(context, color) {
color = color || [24, 46.8, 48.2]
var polyfillAnimFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
var lastframe;
var currentparticles = []
var pendingparticles = []
var buffer = document.createElement('canvas'),
bctx = buffer.getContext('2d')
buffer.width = 20
buffer.height = 20
var opacities = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 5, 5, 7, 4, 4, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 17, 27, 41, 52, 56, 34, 23, 15, 11, 4, 9, 5, 1, 0, 0, 0, 0, 0, 0, 1, 45, 63, 57, 45, 78, 66, 52, 41, 34, 37, 23, 20, 0, 1, 0, 0, 0, 0, 1, 43, 62, 66, 64, 67, 115, 112, 114, 56, 58, 47, 33, 18, 12, 10, 0, 0, 0, 0, 39, 50, 63, 76, 87, 107, 105, 112, 128, 104, 69, 64, 29, 18, 21, 15, 0, 0, 0, 7, 42, 52, 85, 91, 103, 126, 153, 128, 124, 82, 57, 52, 52, 24, 1, 0, 0, 0, 2, 17, 41, 67, 84, 100, 122, 136, 159, 127, 78, 69, 60, 50, 47, 25, 7, 1, 0, 0, 0, 34, 33, 66, 82, 113, 138, 149, 168, 175, 82, 142, 133, 70, 62, 41, 25, 6, 0, 0, 0, 18, 39, 55, 113, 111, 137, 141, 139, 141, 128, 102, 130, 90, 96, 65, 37, 0, 0, 0, 2, 15, 27, 71, 104, 129, 129, 158, 140, 154, 146, 150, 131, 92, 100, 67, 26, 3, 0, 0, 0, 0, 46, 73, 104, 124, 145, 135, 122, 107, 120, 122, 101, 98, 96, 35, 38, 7, 2, 0, 0, 0, 50, 58, 91, 124, 127, 139, 118, 121, 177, 156, 88, 90, 88, 28, 43, 3, 0, 0, 0, 0, 30, 62, 68, 91, 83, 117, 89, 139, 139, 99, 105, 77, 32, 1, 1, 0, 0, 0, 0, 0, 16, 21, 8, 45, 101, 125, 118, 87, 110, 86, 64, 39, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 28, 79, 79, 117, 122, 88, 84, 54, 46, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 6, 55, 61, 68, 71, 30, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 23, 25, 20, 12, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 12, 9, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0]
var data = bctx.createImageData(20, 20)
var d = data.data
for (var i = 0; i < d.length; i += 4) {
d[i] = color[0]
d[i + 1] = color[1]
d[i + 2] = color[2]
d[i + 3] = opacities[i / 4]
}
bctx.putImageData(data, 0, 0)
var imagewidth = 20 * 5
var imageheight = 20 * 5
function particle(x, y, l) {
this.x = x
this.y = y
this.age = 0
this.vx = (Math.random() * 8 - 4) / 100
this.startvy = -(Math.random() * 30 + 10) / 100
this.vy = this.startvy
this.scale = Math.random() * .5
this.lifetime = Math.random() * l + l / 2
this.finalscale = 5 + this.scale + Math.random()
this.update = function(deltatime) {
this.x += this.vx * deltatime
this.y += this.vy * deltatime
var frac = Math.pow((this.age) / this.lifetime, .5)
this.vy = (1 - frac) * this.startvy
this.age += deltatime
this.scale = frac * this.finalscale
}
this.draw = function() {
context.globalAlpha = (1 - Math.abs(1 - 2 * (this.age) / this.lifetime)) / 8
var off = this.scale * imagewidth / 2
var xmin = this.x - off
var xmax = xmin + this.scale * imageheight
var ymin = this.y - off
var ymax = ymin + this.scale * imageheight
context.drawImage(buffer, xmin, ymin, xmax - xmin, ymax - ymin)
}
}
function addparticles(x, y, n, lifetime) {
lifetime = lifetime || 4000
n = n || 10
if (n < 1) return Math.random() <= n && pendingparticles.push(new particle(x, y, lifetime));
for (var i = 0; i < n; i++) {
pendingparticles.push(new particle(x, y, lifetime))
};
}
function updateanddrawparticles(deltatime) {
context.clearRect(0, 0, canvas.width, canvas.height);
deltatime = deltatime || 16
var newparticles = []
currentparticles = currentparticles.concat(pendingparticles)
pendingparticles = []
currentparticles.forEach(function(p) {
p.update(deltatime)
if (p.age < p.lifetime) {
p.draw()
newparticles.push(p)
}
})
currentparticles = newparticles
}
function frame(time) {
if (running) {
var deltat = time - lastframe
lastframe = time;
updateanddrawparticles(deltat)
polyfillAnimFrame(frame)
}
}
var running = false
function start() {
running = true
polyfillAnimFrame(function(time) {
lastframe = time
polyfillAnimFrame(frame)
})
}
function stop() {
running = false
}
return {
start: start,
stop: stop,
step: updateanddrawparticles,
addsmoke: addparticles
}
}
var canvas = document.getElementById('canvas')
var ctx = canvas.getContext('2d')
canvas.width = innerWidth
canvas.height = innerHeight
var party = smokemachine(ctx, [54, 16.8, 18.2])
party.start() // start animating
onmousemove = function(e) {
var x = e.clientX
var y = e.clientY
var n = .5
var t = Math.floor(Math.random() * 200) + 3800
party.addsmoke(x, y, n, t)
}
setInterval(function() {
party.addsmoke(innerWidth / 2, innerHeight, 1)
}, 100)
html,
body {
position: absolute;
margin: 0;
width: 100%;
}
#hi {
position: absolute;
top: 40%;
width: 100%;
text-align: center;
}
#hi a {
color: #fff;
font-size: 80px;
text-decoration: none;
font-family: Lobster;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" />
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
<div class="container">
<ul>
<li>
<a href="#" class="current">
<span data-text="Home" data-target="#carouselExampleIndicators" data-slide-to="0">Home</span>
</a>
</li>
<li>
<a href="#">
<span data-text="About" data-target="#carouselExampleIndicators" data- slide-to="1">About</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Chronic Menu" data-target="#carouselExampleIndicators" data-slide-to="2">Chronic Menu</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Strains" data-target="#carouselExampleIndicators" data- slide-to="3">Strains</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Gallery" data-target="#carouselExampleIndicators" data- slide-to="4">Gallery</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Reviews" data-target="#carouselExampleIndicators" data- slide-to="5">Reviews</span>
</a>
</li>
</ul>
</div>
</nav>
<canvas id="canvas" width="1777" height="898"></canvas>
最佳答案
如果您检查 documentation of the smoke.js plugin on GitHub ,您会看到有两种方法:start()
(启动烟雾)和 stop()
(停止烟雾)。因此,您要做的是在单击导航但不是主页时调用 party.stop()
,如果是主页则调用 party.start()
主页选项。
像这样(我的代码在顶部):
Notice: the
.stop()
method will stop the smoke but it want delete the existing smoke, it's more like a pause. It is unclear if you also want to remove the existing smoke, but if you need to do it, you can follow the instructions on this question to clean thecanvas
.
var navbaroptions = document.querySelectorAll("nav a");
for (var x = 0; x < navbaroptions.length; x++) {
navbaroptions[x].addEventListener("click", function() {
const canvas = document.querySelector("#canvas");
if (this.id === "option-home") {
party.start();
canvas.removeAttribute("hidden");
} else {
party.stop();
// hide the canvas
canvas.setAttribute("hidden", true);
const context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height);
}
});
}
var smokemachine = function(context, color) {
color = color || [24, 46.8, 48.2]
var polyfillAnimFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
var lastframe;
var currentparticles = []
var pendingparticles = []
var buffer = document.createElement('canvas'),
bctx = buffer.getContext('2d')
buffer.width = 20
buffer.height = 20
var opacities = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 5, 5, 7, 4, 4, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 17, 27, 41, 52, 56, 34, 23, 15, 11, 4, 9, 5, 1, 0, 0, 0, 0, 0, 0, 1, 45, 63, 57, 45, 78, 66, 52, 41, 34, 37, 23, 20, 0, 1, 0, 0, 0, 0, 1, 43, 62, 66, 64, 67, 115, 112, 114, 56, 58, 47, 33, 18, 12, 10, 0, 0, 0, 0, 39, 50, 63, 76, 87, 107, 105, 112, 128, 104, 69, 64, 29, 18, 21, 15, 0, 0, 0, 7, 42, 52, 85, 91, 103, 126, 153, 128, 124, 82, 57, 52, 52, 24, 1, 0, 0, 0, 2, 17, 41, 67, 84, 100, 122, 136, 159, 127, 78, 69, 60, 50, 47, 25, 7, 1, 0, 0, 0, 34, 33, 66, 82, 113, 138, 149, 168, 175, 82, 142, 133, 70, 62, 41, 25, 6, 0, 0, 0, 18, 39, 55, 113, 111, 137, 141, 139, 141, 128, 102, 130, 90, 96, 65, 37, 0, 0, 0, 2, 15, 27, 71, 104, 129, 129, 158, 140, 154, 146, 150, 131, 92, 100, 67, 26, 3, 0, 0, 0, 0, 46, 73, 104, 124, 145, 135, 122, 107, 120, 122, 101, 98, 96, 35, 38, 7, 2, 0, 0, 0, 50, 58, 91, 124, 127, 139, 118, 121, 177, 156, 88, 90, 88, 28, 43, 3, 0, 0, 0, 0, 30, 62, 68, 91, 83, 117, 89, 139, 139, 99, 105, 77, 32, 1, 1, 0, 0, 0, 0, 0, 16, 21, 8, 45, 101, 125, 118, 87, 110, 86, 64, 39, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 28, 79, 79, 117, 122, 88, 84, 54, 46, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 6, 55, 61, 68, 71, 30, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 23, 25, 20, 12, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 12, 9, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0]
var data = bctx.createImageData(20, 20)
var d = data.data
for (var i = 0; i < d.length; i += 4) {
d[i] = color[0]
d[i + 1] = color[1]
d[i + 2] = color[2]
d[i + 3] = opacities[i / 4]
}
bctx.putImageData(data, 0, 0)
var imagewidth = 20 * 5
var imageheight = 20 * 5
function particle(x, y, l) {
this.x = x
this.y = y
this.age = 0
this.vx = (Math.random() * 8 - 4) / 100
this.startvy = -(Math.random() * 30 + 10) / 100
this.vy = this.startvy
this.scale = Math.random() * .5
this.lifetime = Math.random() * l + l / 2
this.finalscale = 5 + this.scale + Math.random()
this.update = function(deltatime) {
this.x += this.vx * deltatime
this.y += this.vy * deltatime
var frac = Math.pow((this.age) / this.lifetime, .5)
this.vy = (1 - frac) * this.startvy
this.age += deltatime
this.scale = frac * this.finalscale
}
this.draw = function() {
context.globalAlpha = (1 - Math.abs(1 - 2 * (this.age) / this.lifetime)) / 8
var off = this.scale * imagewidth / 2
var xmin = this.x - off
var xmax = xmin + this.scale * imageheight
var ymin = this.y - off
var ymax = ymin + this.scale * imageheight
context.drawImage(buffer, xmin, ymin, xmax - xmin, ymax - ymin)
}
}
function addparticles(x, y, n, lifetime) {
lifetime = lifetime || 4000
n = n || 10
if (n < 1) return Math.random() <= n && pendingparticles.push(new particle(x, y, lifetime));
for (var i = 0; i < n; i++) {
pendingparticles.push(new particle(x, y, lifetime))
};
}
function updateanddrawparticles(deltatime) {
context.clearRect(0, 0, canvas.width, canvas.height);
deltatime = deltatime || 16
var newparticles = []
currentparticles = currentparticles.concat(pendingparticles)
pendingparticles = []
currentparticles.forEach(function(p) {
p.update(deltatime)
if (p.age < p.lifetime) {
p.draw()
newparticles.push(p)
}
})
currentparticles = newparticles
}
function frame(time) {
if (running) {
var deltat = time - lastframe
lastframe = time;
updateanddrawparticles(deltat)
polyfillAnimFrame(frame)
}
}
var running = false
function start() {
running = true
polyfillAnimFrame(function(time) {
lastframe = time
polyfillAnimFrame(frame)
})
}
function stop() {
running = false
}
return {
start: start,
stop: stop,
step: updateanddrawparticles,
addsmoke: addparticles
}
}
var canvas = document.getElementById('canvas')
var ctx = canvas.getContext('2d')
canvas.width = innerWidth
canvas.height = innerHeight
var party = smokemachine(ctx, [54, 16.8, 18.2])
party.start() // start animating
onmousemove = function(e) {
var x = e.clientX
var y = e.clientY
var n = .5
var t = Math.floor(Math.random() * 200) + 3800
party.addsmoke(x, y, n, t)
}
setInterval(function() {
party.addsmoke(innerWidth / 2, innerHeight, 1)
}, 100)
html,
body {
position: absolute;
margin: 0;
width: 100%;
}
#hi {
position: absolute;
top: 40%;
width: 100%;
text-align: center;
}
#hi a {
color: #fff;
font-size: 80px;
text-decoration: none;
font-family: Lobster;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" />
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
<div class="container">
<ul>
<li>
<a href="#" class="current" id="option-home">
<span data-text="Home" data-target="#carouselExampleIndicators" data-slide-to="0">Home</span>
</a>
</li>
<li>
<a href="#">
<span data-text="About" data-target="#carouselExampleIndicators" data- slide-to="1">About</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Chronic Menu" data-target="#carouselExampleIndicators" data-slide-to="2">Chronic Menu</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Strains" data-target="#carouselExampleIndicators" data- slide-to="3">Strains</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Gallery" data-target="#carouselExampleIndicators" data- slide-to="4">Gallery</span>
</a>
</li>
<li>
<a href="#">
<span data-text="Reviews" data-target="#carouselExampleIndicators" data- slide-to="5">Reviews</span>
</a>
</li>
</ul>
</div>
</nav>
<div style="margin-top:300px;position:absolute;"><a href="#">Link for testing</a></div>
<canvas id="canvas" width="1777" height="898" style="position:relative;"></canvas>
关于javascript - 如何通过单击导航按钮开始/结束 smoke.js 动画?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53713627/
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