好吧,我真的很感兴趣i-remember.fr如何在他们的主页上用粒子制作他们的圆圈。不是他们制作了一个圆圈的事实,而是看起来似乎有成千上万的粒子,而且没有任何性能问题。所以我开始尝试复制这个圈子,试图获得相同的表现 - 到目前为止没有任何运气。
在一切开始变得不稳定之前,我似乎可以得到 3000 粒子,但是我没有得到任何数量的粒子。我正在使用RequestAnimationFrame帮助提高性能,以及我能想到的所有其他内容......我可以获得一些帮助以获得更多粒子吗?
的Javascript
$('.blackhole').click(function() {
$(this).toggleClass('open_blackhole');
$(this).toggleClass('close_blackhole');
});
// Define Apparatus Variables.
var cw = window.innerWidth,
ch = window.innerHeight,
blackhole_entities = {},
blackhole_entitiesIndex = 0,
blackhole_entitieAmount = 3000, //6000
canvas = $('<canvas/>').attr({
width: cw,
height: ch,
id: "apparatus"
}).appendTo('body'),
context = canvas.get(0).getContext("2d");
var requestframe = window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.msRequestAnimationFrame ||
window.oRequestAnimationFrame ||
// IE Fallback, you can even fallback to onscroll
function(callback) {
window.setTimeout(callback, 1000 / 60)
};
// Default Entity "Class"
apparatus.blackhole = function(orbit) {
blackhole_entitiesIndex++;
this.id = blackhole_entitiesIndex;
blackhole_entities[blackhole_entitiesIndex] = this;
this.width = 1;
this.height = 1;
this.orbit = orbit;
this.velocity = Math.floor((Math.random() * 3200) + 3000);
this.angle = (Math.PI * 2 / this.width) * Math.floor((Math.random() * cw*4) + 10);;
var choice = Math.random() * 5;
var rands = [];
rands.push(Math.random() * 100 + 1);
rands.push(Math.random() * 10 + 241);
var choice2 = Math.random() * 4;
var rands2 = [];
rands2.push(Math.random() * 100 + 1);
rands2.push(Math.random() * 180 + 211);
this.distance = (rands.reduce(function(p, c) {
return p + c;
}, 0) / rands.length);
this.distance2 = (rands2.reduce(function(p, c) {
return p + c;
}, 0) / rands2.length);
this.increase = Math.PI * 2 / this.width;
this.distancefix = this.distance;
this.distance2fix = this.distance2;
this.color = "255,255,255";
this.alpha = 0.6
this.bx = Math.random() * 20 + 1;
this.by = Math.random() * 20 + 1;
this.inplace = true;
}
apparatus.blackhole.prototype.draw = function() {
if (this.orbit >= 2) {
this.x = this.bx + this.distance * Math.cos(this.angle / this.velocity) + cw / 2;
this.y = this.by + this.distance * Math.sin(this.angle / this.velocity) + ch / 2;
this.alpha = 0.6;
} else {
this.x = this.bx + this.distance2 * Math.cos(this.angle / this.velocity) + cw / 2;
this.y = this.by + this.distance2 * Math.sin(this.angle / this.velocity) + ch / 2;
this.alpha = 0.4;
}
if ($('.blackhole').hasClass('open_blackhole')) {
$('.blackhole').removeClass('close_blackhole');
if (this.distance >= 171) {
this.distance = this.distance - 4;
} else if (this.distance <= 161) {
this.distance= this.distance + 8;
}
if (this.distance2 >= 201) {
this.distance2 = this.distance2 - 6;
} else if (this.distance2 <= 161) {
this.distance2 = this.distance2 + 6;
}
}
if($('.blackhole').hasClass('close_blackhole')){
if (this.distance >= this.distancefix + 4) {
this.distance = this.distance - 4;
} else if (this.distance <= this.distancefix - 5) {
this.distance= this.distance + 5;
}
if (this.distance2 >= this.distance2fix + 10) {
this.distance2 = this.distance2 - 4;
} else if (this.distance2 <= this.distance2fix - 10) {
this.distance2 = this.distance2 + 4;
}
}
this.angle += this.increase;
context.fillStyle = "rgba(" + this.color + "," + this.alpha + ")";
context.fillRect(this.x, this.y, this.width, this.height);
}
apparatus.start = function() {
apparatus('true');
}
apparatus.stop = function() {
apparatus('false');
}
for (var i = 0; i < blackhole_entitieAmount; i++) {
new apparatus.blackhole((Math.random() * 4));
}
var mode;
apparatus.spawn_blackhole = function(){
for (i in blackhole_entities) {
blackhole_entities[i].draw();
}
}
function apparatus(mode) {
if (mode == 'true') {
var i;
requestframe(function() {
context.clearRect(0, 0, cw, ch);
apparatus.spawn_blackhole();
apparatus('true');
});
}
}
apparatus.start();
HTML 的
<div class="blackhole button closed_blackhole">
BLACKHOLE
</div>
希望这不是重复,我已经搜索了很长一段时间。
这是我当前引擎的CodePen link。 (如果你将blackhole_entitieamount
变量改为,比方说6000,你会发现它变得非常迟钝。)
答案 0 :(得分:1)
我认为最大的缺点之一是在draw函数中使用jQuery。类似$('.blackhole').hasClass('close_blackhole')
这样的事情在你的情况下非常慢,当你每帧数千次这样做时。你整整做了三次,这意味着每帧9000次。要么缓存$('.blackhole')
以便你把它降到blackhole_entitieAmount
或最好 - 删除它并想一些内在的存储它的方法。
首先尝试将var blackhole = $('.blackhole');
放在代码的最开头,然后替换以后的用法,然后再次测试:)