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JavaScript method to simulate parabolic motion under gravity_javascript skills

WBOY
WBOYOriginal
2016-05-16 16:11:061427browse

The example in this article describes how JavaScript simulates parabolic motion under gravity. Share it with everyone for your reference. The specific analysis is as follows:

This JavaScript code simulates parabolic motion under gravity. The following parameters can be set: transverse initial velocity, longitudinal initial velocity, gravity acceleration (if this acceleration is a value that changes with time, other non-uniform acceleration motions can be achieved effect), animation interval, etc., relatively professional 

<!doctype html>
<html>
<head>
<title>js抛物运动</title>
<meta charset="utf-8" />
<style type="text/css">
*{padding:0;margin:0;}
body{font-size:13px;padding:10px;}
p{margin:2px;}
.wrap{position:relative;width:1000px;height:550px;margin:0 auto;border:1px solid #ccc;margin-top:50px;}
#fall{width:20px;font-size:1px;height:20px;background:#000;position:absolute;top:0;left:0;}
</style>
</head>
<body>
<h3>模拟重力状态下的抛物运动（假使1px==1mm）</h3>
<p>横向初速度：<input id="Vx" type="text" value="2" />px/ms</p>
<p>纵向初速度：<input id="Vy" type="text" value="-2" />px/ms</p>
<p>重力加速度：<input id="a" type="text" value="0.0098" />px/平方ms</p>
<p>（如果这个加速度是一个随时间变化的值，就能达到其他非匀加速运动的效果了。）</p>
<p>单位时间：<input id="t" type="text" value="10" />（记录运动的时间间隔）
<p><input type="button" value="演示" onclick="demo(document.getElementById('Vx').value, document.getElementById('Vy').value, document.getElementById('a').value, document.getElementById('t').value)"/></p>
<div class="wrap">
<div id="fall">o</div>
</div>
</body>
<script type="text/javascript">
function demo(x,y,a,t) {
var f=document.getElementById('fall');
var Vx=parseInt(x),
Vy=parseInt(y),
g=a,
t=parseInt(t),
h=0,l=0,Sx=0,Sy=0;
var i=setInterval(function(){
if(f){
Sx+=Vx*t;
l=Sx;
Vy+=g*t;
h+=Vy*t;
f.style.left=l+'px';
f.style.top=h+'px';
if(h>500||l>900)clearInterval(i);
}
},t);
}
</script>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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