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var single = ["Math.sqrt", "Math.cos", "Math.sin"]; //Operations on a single number
var binary = ["*", "+", "-", "/"]; //Operations for 2 numbers
var varlist = ["x"];
var numlist = ["Constant"];
numlist = numlist.concat(varlist);
var numberweight = 1;
var singleweight = 1;
var flength;
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 randFunction()
{
var hasx = false;
var func;
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
func = '';
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)), flength);
if (lasttype == 'n')
{
number = Math.random();
if (number < chanceend)
{
break;
}
func = '(' + func + ')' + randItem(binary);
lasttype = 'b';
}
else if (lasttype == 's' || lasttype == 'b' || lasttype == 'f')
{
func += '(';
thistype = Math.random();
if (thistype < singleweight / (singleweight + numberweight))
{
func += randItem(single);
lasttype = 's';
}
else
{
what = randItem(numlist);
if (what == 'Constant')
{
func += (Math.random()*100+100).toString();
}
else
{
func += what;
if (what == 'x')
{
hasx = true;
}
}
lasttype = 'n';
func += ')';
}
}
length++;
}
}
while (countChar(func, '(') > countChar(func, ')'))
{
func += ')';
}
return func;
}
function create()
{
var notify;
var length;
var date = new Date();
var start = date.getTime();
$("#Error").html("");
length = parseInt($("#length").val());
notify = $("#notify").prop("checked");
singleweight = parseFloat($("#single").val());
numberweight = parseFloat($("#number").val());
flength = parseFloat($("#flength").val());
if (isNaN(length) || isNaN(singleweight) || isNaN(numberweight) || isNaN(flength))
{
$("#Error").html("Please enter a valid number.");
stopLoading();
return;
}
var data = [];
var func = randFunction();
eval(
"for (var x=0; x<length * 10000; x++)"
+ "{"
+ "var value = (" + func + ") % 1;"
+ "data[x] = Math.abs(255 * value);"
+ "}");
var wave = new RIFFWAVE(data);
var audio = document.getElementById('Audio');
audio.src = wave.dataURI;
date = new Date();
var end = date.getTime();
var timetaken = Math.round((end-start)/1000);
if (timetaken == 1)
{
$("#Time").html("The time it took was 1 second.");
}
else
{
$("#Time").html("The time it took was " + timetaken + " seconds.");
}
$("#Function").html("$Function: $" + rmvmath(func));
LatexIT.render('*',false);
stopLoading();
$("#Audio").show();
if(notify)
{
alert('Your audio has finished.');
}
audio.play();
}
function startLoading()
{
$('#Create').prop('disabled', true);
$('#Create').html('Loading...');
}
function stopLoading()
{
$('#Create').prop('disabled', false);
$('#Create').html('Create');
}
function start()
{
startLoading();
window.setTimeout(create, 1);
}
$(function()
{
$("#Audio").hide();
});
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