116 lines
3.4 KiB
JavaScript
116 lines
3.4 KiB
JavaScript
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Number.prototype.decimals = function() {
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if(Math.floor(this.valueOf()) === this.valueOf()) return 0;
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return (this.toString().split(".")[1] || '').length;
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}
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Math.trueRound = function(number, precision) {
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var shift = function (number, precision, reverseShift) {
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if (reverseShift) {
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precision = -precision;
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}
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var numArray = ("" + number).split("e");
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return +(numArray[0] + "e" + (numArray[1] ? (+numArray[1] + precision) : precision));
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};
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return shift(Math.round(shift(number, precision, false)), precision, true);
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}
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window.onload = function() {
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measureUpdate();
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}
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function measureUpdate() {
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let units = length.units;
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let select = length.select;
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switch($('#measure').val()) {
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case 'length': units = length.units; select = length.select; break;
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case 'temp': units = temp.units; select = temp.select; break;
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case 'mass': units = mass.units; select = mass.select; break;
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case 'area': units = area.units; select = area.select; break;
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case 'time': units = time.units; select = time.select; break;
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case 'volume': units = volume.units; select = volume.select; break;
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case 'energy': units = energy.units; select = energy.select; break;
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case 'computing': units = computing.units; select = computing.select; break;
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}
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updateUnits(units, select);
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recalc();
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}
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function updateUnits(units, select) {
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$('#unit1').empty();
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$('#unit2').empty();
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s1 = units.indexOf(select[0]);
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s2 = units.indexOf(select[1]);
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for(let i = 0; i < units.length; i++) {
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let elem = $('<option></option>').val(units[i]).text(units[i]);
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if(i == s1) elem = elem.attr('selected', true);
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$('#unit1').append(elem);
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}
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for(let i = 0; i < units.length; i++) {
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let elem = $('<option></option>').val(units[i]).text(units[i]);
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if(i == s2) elem = elem.attr('selected', true);
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$('#unit2').append(elem);
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}
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}
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function recalc() {
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let m = length;
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switch($('#measure').val()) {
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case 'length': m = length; break;
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case 'temp': m = temp; break;
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case 'mass': m = mass; break;
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case 'area': m = area; break;
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case 'time': m = time; break;
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case 'volume': m = volume; break;
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case 'energy': m = energy; break;
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case 'computing': m = computing; break;
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}
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let value = $('#val1').val();
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let result = 0;
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if(m.ctype == 'mul') {
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// Simple multiplication
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let u1 = $('#unit1').val(), u2 = $('#unit2').val();
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let done = false;
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// Check custom conversions
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for(let i = 0; i < m.custom.length; i++) {
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let c = m.custom[i];
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if(c[0] == u1 && c[1] == u2) {
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result = Math.trueRound(value*c[2], 12);
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done = true;
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} else if(c[0] == u2 && c[1] == u1) {
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result = Math.trueRound(value/c[2], 12);
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done = true;
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}
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}
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if(!done) {
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// Convert
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let indexFrom = m.units.indexOf(u1), indexTo = m.units.indexOf(u2);
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let fc = m.conversions[indexFrom], tc = m.conversions[indexTo];
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newv = value*fc/tc;
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result = Math.trueRound(newv, 12);
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}
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} else if(m.ctype == 'funct') {
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// Function (for temp)
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newv = m.conversions[':'+$('#unit2').val()](m.conversions[$('#unit1').val()+':'](value))
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result = Math.trueRound(newv, 8);
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}
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$('#val2').val(result);
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}
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function swap() {
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let u1 = $('#unit1').val();
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let u2 = $('#unit2').val();
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let v1 = $('#val1').val();
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let v2 = $('#val2').val();
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$('#unit1').val(u2);
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$('#unit2').val(u1);
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$('#val1').val(v2);
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$('#val2').val(v1);
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}
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