JAVASCRIPT - Medidas geométricas del círculo

Medidas geométricas del círculo

Compatibilidad: Ms Internet Explorer, Netscape
Calcula las medidas geométricas del círculo

[ Muestra el ejemplo práctico ]

el código para insertar en tu página

<TITLE>Ejemplos Javascript: ejemplo práctico </TITLE>

/********************************************************
**       S.Christopher Brown's (Spikeman)'s            **
**           java script  circle math for              **
**          Area & Diameter & Circumfrence             **
**    copyright © 1997 S.Chris Brown (Spikeman)        **
**                spikeman@myself.com                  **
**   http://www.geocities.com/BourbonStreet/3843       **
**               All Rights Reserved                   **
**  You can freely use this script, if this credit is  **
**     included in the source. This Script is for      **
**   noncommercial use only. and has been placed in    **
**   The public domain and no fees can be charged in   **
**     conjunction with distribution or use.           **
**                  Thank you                          ** 
********************************************************/ 
// This JavaScript code Originally by S.Chris Brown  (Spikeman) 1997 ( http://www.geocities.com/BourbonStreet/3843 )    
function circle(form,changed) {
with (Math) {
var area = form.area.value;
var diameter = form.diameter.value;
var circumfrence = form.circumfrence.value;
if (changed == "area") {
var radius = sqrt(area / PI);
diameter = 2 * radius;
circumfrence = PI * diameter;
}
if (changed == "diameter") {
area = PI * (diameter / 2) * (diameter / 2);
circumfrence = PI * diameter;
}
if (changed == "circumfrence") {
diameter = circumfrence / PI;
area = PI * (diameter / 2) * (diameter / 2);
       }
form.area.value = area;
form.diameter.value = diameter;
form.circumfrence.value = circumfrence;
  }
}
var toDegrees = 360 / (Math.PI * 2);
var toRadians = (Math.PI * 2) / 360;
function about()
{
alert(" About for Spikeman\'s JavaScript Circle Math For \n            Area & Diameter & Circumfrence     \n\n This Was Made to help people get the Area,Diameter or \n              Circumfrence with one of values.. \n    ");
alert("\n            Spikeman\'s Circle Math For \n       Area & Diameter & Circumfrence    \n\n                       © 1997 Spikeman  \n                 spikeman@myself.com\nhttp://www.geocities.com/BourbonStreet/3843")
}
function help()
{
alert(" Help for Spikeman\'s JavaScript Circle Math For \n            Area & Diameter & Circumfrence     \n\n Put in a Number into One of the box\'s  \n Then Click in one of the other  box\'s \n And you will get the values of that number. \n    ");
}
//------------->

</SCRIPT>

</HEAD>

<center> <H1>Circle Math</H1>
<FORM METHOD=POST>
<table border="5"><tr>
<td><B><center>Area:</td><td><center><INPUT TYPE="text" NAME="area" VALUE=0 onChange="circle(this.form,this.name);"></td>
</tr><tr>
<td><center><B>Diameter:</td><td><center><INPUT TYPE="text" NAME="diameter" VALUE=0 onChange="circle(this.form,this.name);"></td>
</tr><tr>
<td><center><B>Circumfrence:</td><td><center><INPUT TYPE="text" NAME="circumfrence" VALUE=0 onChange="circle(this.form,this.name);"></td>
</tr><tr>
<td><center><input type="button" value="Help" onclick="help()"></td><td><center><input type="button" value="About" onclick="about()"><INPUT TYPE="RESET" VALUE="Clear"></td>
</tr></table> 
</FORM>

</body>
</html>

[Baja en un único archivo .zip, las imágenes y demás archivos necesarios
para el funcionamiento de los script de esta sección]