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Randomly generated bubble collisions (native JS)

Source: Internet
Author: User
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<! DOCTYPE html>

<meta charset= "UTF-8" >
<title> randomly generated bubble collisions </title>
<style>
HTML {
height:100%;
}

Body {
width:100%;
margin:0;
padding:0;
height:100%;
}

Div.wrap {
height:100%;
position:relative;
Overflow:hidden;
margin:0;
padding:0;
}

Div:not (. Wrap) {
border-radius:50%;
/*-webkit-animation:tanslateani 5000ms Infinite Linear alternate;*/
/*transition:all 10000ms linear;*/
}

Div:nth-of-type (2) {
-webkit-animation-delay:2000ms;
}

Div:nth-of-type (3) {
-webkit-animation-delay:4000ms;
}

Div:nth-of-type (4) {
-webkit-animation-delay: -1000ms;
}

@-webkit-keyframes Tanslateani {
0% {
-webkit-transform:rotate (10deg) translate3d (0px, 0px, 0)
}
35% {
-webkit-transform:rotate (0deg) translate3d (20px, 0px, 0)
}
70% {
-webkit-transform:rotate ( -10deg) translate3d (0px, 0px, 0)
}
100% {
-webkit-transform:rotate (0deg) translate3d ( -20px, 0px, 0)
}
}

span {
Display:inline-block;
width:100px;
height:100px;
border-radius:50%;
background-color:red;
Background:-webkit-repeating-radial-gradient (red, yellow 10%, green 15%);
/* Safari 5.1-6.0 */
Background:-o-repeating-radial-gradient (red, yellow 10%, green 15%);
/* Opera 11.6-12.0 */
Background:-moz-repeating-radial-gradient (red, yellow 10%, green 15%);
/* Firefox 3.6-15 */
Background:repeating-radial-gradient (red, yellow 10%, green 15%);
/* Standard syntax (must be placed at the end) */
</style>

<body>
<div class= "wrap" id= ' parent ' ></div>
<span></span>
</body>
<script>
var elwidth = 110;
var containerwidth;
var color = ['-webkit-repeating-radial-gradient (red, yellow 10%, green 15%) ', ' green ', ' blue ', ' black ', ' yellow '];
Random Color
var ballnum = 20;
var pageheight=window.screen.height;
var pageheight = document.body.clientHeight;
var pagewidth=window.screen.width;
var pagewidth = document.body.clientWidth;
Containerwidth = PageWidth;
var sizerange = 60;
var balls = [];
Window.onload = function () {
Createballs (Elwidth + sizerange, PageWidth, PageHeight, ballnum);
SetInterval (function () {Ballhit (balls, PageWidth, PageHeight)}, 30)
}
Generate a virtual mesh
function CreateTable (ballwidth, PageWidth, PageHeight) {
var col = Math.floor (pagewidth/ballwidth);
var Marginh = pagewidth% Ballwidth;
var MARGINV = pageheight% Ballwidth;
var row = Math.floor (pageheight/ballwidth);
var total = col * row;
var ballmap = [];
for (var i = 0; i < total; i++) {
Grid map deposit into one-dimensional array//top, left value has a large deviation reason:/, the% operation is a decimal, and Java is different
Ballmap[i] = {LEFT:MARGINH/2 + math.floor (i% col) * Ballwidth, TOP:MARGINV/2 + math.floor (i/col) * Ballwidth}
}
return ballmap;
}
Generate pellets
var spaceindex = 25;

function Createballs (ballwidth, PageWidth, PageHeight, Ballnum) {
var ballmap = createtable (Ballwidth, PageWidth, PageHeight);
var range = Ballmap.length
if (ballnum >= range-spaceindex) {
Ballnum = Range-spaceindex;
}
var ballsdata = [];
var Ballindex;
Ballindex = getrandom (0, Range, ballnum);
for (var i = 0; i < ballindex.length; i++) {ballsdata[i] = Ballmap[ballindex[i]];} renderballs (Ballsdata, ballnum);
}//Render small balls
function Renderballs (Balldata, Ballnum) {
for (var i = 0; i < Ballnum; i++) {
var divball = createel (' div ')
(Pending improvement)
Balls.push ({
El:divball,
Left:balldata[i].left,
Top:balldata[i].top,
Vx:Math.random () * 6-3,
Vy:Math.random () * 6-3,
Raduis:parseint (divBall.style.width)/2
});
}
for (var j = 0; J < Ballnum; J + +) {
Balls[j].el.style.left = balls[j].left + ' px ';
Balls[j].el.style.top = balls[j].top + ' px ';
}
}//random number de-weight
function Norepeat (arr, newnum, range) {
var isrepeat = false;
for (var i = 0; i < arr.length; i++) {
if (Newnum = = Arr[i]) {
Isrepeat = true;
Break
}
}
if (isrepeat) {
Newnum = Math.floor (Math.random () * range);
Norepeat (arr, newnum, range);
} else {
return newnum;
}
}//Random number de-tool function 2
function Getrandom (min, max, n) {
if (n > (max-min + 1) | | Max < min) {
return null;
}
var result = [];
var count = 0;
while (Count < N) {
var num = Math.floor (Math.random () * (max-min)) + min;
var flag = true;
for (var j = 0; J < N; j + +) {
if (num = = Result[j]) {
Flag = false;
Break
}
}
if (flag) {
Result[count] = num;
count++;
}
}
return result;
}//randomly generate a DOM element
function Createel (el, text) {
var elment = document.createelement (EL);
document.getElementById (' parent '). AppendChild (elment);
var len = Math.ceil (Math.random () * sizerange);
Elment.style.width = len + elwidth + ' px ';
Elment.style.height = len + elwidth + ' px ';
Elment.style.background = Color[math.floor (Math.random () * 5)];
elment.style.position = ' absolute ';
elment.innerhtml = text | | "";
return elment;
}

function Moveball (balls) {
for (var i = 0; i < balls.length; i++) {
Balls[i].left + = BALLS[I].VX;
Balls[i].top + = Balls[i].vy;
Balls[i].el.style.left = balls[i].left + ' px ';
Balls[i].el.style.top = balls[i].top + ' px ';
}
}
var spring = 1; Elasticity coefficient between ball and ball
var bounce =-1; Elasticity coefficient between ball and edge
function Ballhit (balls, PageWidth, PageHeight) {
Detecting edges
for (var i = 0; i < balls.length; i++) {
if (balls[i].left <= 0 | | balls[i].left >= pageWidth-2 * balls[i].raduis) {
BALLS[I].VX *= Bounce;
}
if (balls[i].top <= 0 | | balls[i].top >= pageHeight-2 * balls[i].raduis) {
Balls[i].vy *= Bounce;
}
}
Detecting small balls and small balls
for (i = 0; i < balls.length; i++) {
var ball1 = balls[i];
ball1.x = Ball1.left + Ball1.raduis;
BALL1.Y = Ball1.top + Ball1.raduis;
for (j = i + 1; j < Balls.length; J + +) {
var ball2 = balls[j];
ball2.x = Ball2.left + Ball2.raduis;
BALL2.Y = Ball2.top + Ball2.raduis;
DX = ball2.x-ball1.x;
dy = ball2.y-ball1.y;
var dist = math.sqrt (dx * dx + dy * dy);
var misdist = Ball1.raduis + Ball2.raduis;
if (Dist < misdist) {
var angle = math.atan2 (dy, dx);
tx = ball1.x + math.cos (angle) * misdist;
ty = ball1.y + math.sin (angle) * misdist;
Ax = (tx-ball2.x) * SPRING;
ay = (ty-ball2.y) * SPRING;
BALL1.VX-= ax;
Ball1.vy-= ay;
BALL2.VX + = ax;
Ball2.vy + = ay;
}
}
}
Moveball (balls);
}
</script>

Randomly generated bubble collisions (native JS)

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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