Scheben
Newbie
Joined: 09 Apr 2002
Posts: 9
Location: Stuttgart,Germany
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 Posted: Sun Jan 09, 2005 11:45 am Post subject: Javascript ---> VDS |
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Hi there, long time not seen 
Well, ive got a little prob. I want to convert a javascript to VDS source, but this script seems to be complex, its confusing me. This script calculates sea water salinity but i want my own little tool to calculate it
Any ideas how to convert the maths? Thanks 
The script was found here:
http://home.arcor.de/chronz/aquaristik/tips_tricks/berechnungen.htm
(the first calculator at top)
| Code: |
<SCRIPT language=JavaScript>
<!--
function dichte(form) {
var temp=parseFloat(form.temp.value);
var sal=parseFloat(form.sal.value);
var dens= - 0.157406 + temp*(6.793952E-2 - temp*(9.095290E-3 - temp*(1.001685E-4 - temp*(1.120083E-6 - temp *6.536332E-9)))) + sal*(8.24493E-1 - temp*(4.0899E-3 - temp*(7.6438E-5 - temp*(8.2467E-7 - temp*5.3875E-9))) - Math.sqrt(sal)*(5.72466E-3 - temp*(1.0227E-4 - temp*1.6546E-6)) + sal*4.8314E-4);
var dens= dens+1000
var dens25= - 0.157406 + 25*(6.793952E-2 - 25*(9.095290E-3 - 25*(1.001685E-4 - 25*(1.120083E-6 - 25 *6.536332E-9)))) + sal*(8.24493E-1 - 25*(4.0899E-3 - 25*(7.6438E-5 - 25*(8.2467E-7 - 25*5.3875E-9))) - Math.sqrt(sal)*(5.72466E-3 - 25*(1.0227E-4 - 25*1.6546E-6)) + sal*4.8314E-4);
var dens25= dens25+1000
form.dens.value= Math.round(10*dens)/10;
form.dens25.value= Math.round(10*dens25)/10;
form.tempe.value=(Math.round(10*temp)/10)+"°C";
form.temp25.value="25.0°C";
}
function salinitaet(form) {
var temps=parseFloat(form.temps.value);
var denss=parseFloat(form.denss.value);
denss= denss-999.96;
var limit = 10000;
var salmin = 0.0;
var salmax = 100.0;
var fehler = 1.0;
var densNeu;
var i = 0;
while( (Math.abs(fehler) > 0.00001) && (i < limit) ) {
sals = (salmin+salmax) / 2.0;
densNeu = - 0.157406 + temps*(6.793952E-2 - temps*(9.095290E-3 - temps*(1.001685E-4 - temps*(1.120083E-6 - temps *6.536332E-9)))) + sals*(8.24493E-1 - temps*(4.0899E-3 - temps*(7.6438E-5 - temps*(8.2467E-7 - temps*5.3875E-9))) - Math.sqrt(sals)*(5.72466E-3 - temps*(1.0227E-4 - temps*1.6546E-6)) + sals*4.8314E-4);
fehler = (densNeu-denss) / denss;
if (fehler > 0.0)
salmax = sals;
else
salmin = sals;
++i;
}
if ( i >= limit )
form.sals.value= "ERROR";
else
form.sals.value= "Salinität = "+Math.round(100*sals)/100+" psu";
}
---->
</SCRIPT>
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