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var length;
var single = ["Math.sqrt", "Math.cos", "Math.sin"]; //Operations on a single number
var singleweights = {};
var binary = ["*", "+", "-", "/"]; //Operations for 2 numbers
var binaryweights = {};
var varlist = ["x"];
var numlist = ["Constant"];
numlist = numlist.concat(varlist);
var numberweights = {"Constant":1};
var numberweight = 1;
var singleweight = 1;
var eqlength;
var notify;
var functionp = document.getElementById('Function');
for(var i = 0; i < single.length; i++)
{
singleweights[single[i]] = 1;
}
for(var i = 0; i < binary.length; i++)
{
binaryweights[binary[i]] = 1;
}
for(var i = 0; i < varlist.length; i++)
{
numberweights[varlist[i]] = 1;
}
function randItem(l)
{
return l[Math.floor(Math.random() * l.length)];
}
function countChar(string, letter)
{
var amount = 0;
for (var i = 0; i < string.length; i++)
{
if (string[i] == letter)
{
amount++;
}
}
return amount;
}
function rmvmath(str)
{
//A function that removes all the Math.'s in a string
var newstr = '';
for(var i = 0; i < str.length - 5; i++)
{
if(str[i] + str[i+1] + str[i+2] + str[i+3] + str[i+4] !== 'Math.')
{
newstr += str[i]
}
else
{
i += 4;
}
}
return newstr;
};
function randEquation()
{
var hasx = false;
var equation;
var lasttype;
var thistype;
var chanceend;
var length;
var what;
var number;
while (!hasx)
{
//Types: b for binary, s for single, f for first, n for number
equation = '';
lasttype = 'f';
thistype = 0;
hasx = false;
chanceend = 0;
length = 1; //Number of operations done so far
while (true)
{
chanceend = Math.pow((1.0 - (1.0 / length)), eqlength);
if (lasttype == 'n')
{
number = Math.random();
if (number < chanceend)
{
break;
}
equation = '(' + equation + ')' + randItem(binary);
lasttype = 'b';
}
else if (lasttype == 's' || lasttype == 'b' || lasttype == 'f')
{
equation += '(';
thistype = Math.random();
if (thistype < singleweight / (singleweight + numberweight))
{
equation += randItem(single);
lasttype = 's';
}
else
{
what = randItem(numlist);
if (what == 'Constant')
{
equation += (Math.random()*100+100).toString();
}
else
{
equation += what;
if (what == 'x')
{
hasx = true;
}
}
lasttype = 'n';
equation += ')';
}
}
length++;
}
}
while (countChar(equation, '(') > countChar(equation, ')'))
{
equation += ')';
}
return equation;
}
function evalEquation(eq, x)
{
try
{
eval('var result = ' + eq);
return result;
}
catch(err)
{
return 0;
}
}
function create()
{
var date = new Date();
var start = date.getTime();
var form = document.getElementById('Options');
var errtag = document.getElementById('Error');
errtag.innerHTML = '';
for (var i = 0; i < form.elements.length; i++)
{
if (form.elements[i].value == '')
{
errtag.innerHTML = 'Please enter a valid number.';
return;
}
}
length = parseInt(form.elements[1].value);
notify = form.elements[2].checked;
singleweight = parseFloat(form.elements[4].value);
numberweight = parseFloat(form.elements[5].value);
eqlength = parseFloat(form.elements[6].value);
var data = [];
var equation = randEquation();
for (var i=0; i<length * 10000; i++)
{
var value = evalEquation(equation, i);
value %= 1;
data[i] = Math.abs(255 * value);
}
var wave = new RIFFWAVE(data);
audio = document.getElementById('Audio');
audio.src = wave.dataURI;
date = new Date();
end = date.getTime();
var timeparagraph = document.getElementById('Time');
var timetaken = Math.round((end-start)/1000);
if (timetaken == 1)
{
timeparagraph.innerHTML = 'The time it took was 1 second.';
}
else
{
timeparagraph.innerHTML = 'The time it took was ' + timetaken + ' seconds.';
}
functionp.innerHTML = '$Function: $' + rmvmath(equation);
LatexIT.render('*',false);
if(notify)
{
alert('Your audio has finished.');
}
audio.play();
}
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