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JavaScript method for simulating parabolic motion in gravity state

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Author: User
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JavaScript method for simulating parabolic motion in gravity state

This article mainly introduces the method of simulating the parabolic motion of JavaScript in the gravity state. The example analyzes the method of simulating the movement of javascript dom elements, which has some reference value. If you need it, you can refer to it.

 

 

This article describes how to simulate the parabolic motion in the gravity state using JavaScript. Share it with you for your reference. The specific analysis is as follows:

This JavaScript code simulates the parabolic motion in the gravity state. You can set the following parameters: horizontal initial velocity, vertical initial velocity, and gravity acceleration (if this acceleration is a time-varying value, can achieve other non-uniformly accelerated motion effects), animation interval, etc., relatively professional

 

The Code is as follows:


<! Doctype html>
<Html>
<Head>
<Title> js parabolic motion </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> simulate the parabolic motion under the gravity state (if 1px = 1mm) <P> horizontal initial speed: <input id = "Vx" type = "text" value = "2"/> px/ms </p>
<P> vertical initial speed: <input id = "Vy" type = "text" value = "-2"/> px/ms </p>
<P> acceleration of gravity: <input id = "a" type = "text" value = "0.0098"/> px/square ms </p>
<P> (if the acceleration is a time-varying value, other non-uniformly accelerated motion can be achieved .) </P>
<P> unit time: <input id = "t" type = "text" value = "10"/> (recording the interval of motion)
<P> <input type = "button" value = "demo" 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 =,
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 help you design javascript programs.

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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