Ancient Measurement Converter

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'; return; } // --- ANCIENT UNIT DATA (Base: Meters) --- // Sources for historical conversion factors often vary; these are widely accepted approximate mean values. const ANCIENT_UNITS = { Egyptian: { // Base unit: Royal Cubit (approx. 0.523m) 'Royal Cubit (Meh)': { baseMeters: 0.523, imperialName: 'Cubit' }, 'Palm (Shesep)': { baseMeters: 0.075, imperialName: 'Palm' }, // 1/7 of a Royal Cubit 'Digit (Djeba)': { baseMeters: 0.01875, imperialName: 'Finger' }, // 1/4 of a Palm 'Khet (Land Measure)': { baseMeters: 52.3, imperialName: 'Khet' } // 100 Royal Cubits }, Roman: { // Base unit: Pes (Roman foot, approx. 0.296m) 'Pes (Foot)': { baseMeters: 0.296, imperialName: 'Foot' }, 'Palmus (Palm)': { baseMeters: 0.074, imperialName: 'Palm' }, // 1/4 Pes 'Uncia (Inch)': { baseMeters: 0.0246, imperialName: 'Inch' }, // 1/12 Pes 'Passus (Pace)': { baseMeters: 1.48, imperialName: 'Pace' }, // 5 Pes 'Mille Passuum (Mile)': { baseMeters: 1480.0, imperialName: 'Roman Mile' } // 1000 Paces } }; // --- MODERN CONVERSION FACTORS --- const METER_TO_FOOT = 3.28084; const METER_TO_YARD = 1.09361; const FOOT_TO_INCH = 12; // Helper to format numbers to 3 decimal places function formatNumber(num) { return parseFloat(num).toFixed(3).replace(/\B(?=(\d{3})+(?!\d))/g, ","); } // --- CONFIGURATION LOGIC --- window.updateUnits = function() { const selectedSystem = systemSelect.value; // Guard clause for safety if (!selectedSystem || selectedSystem === 'none') { unitSelect.innerHTML = 'Select System First'; unitSelect.disabled = true; return; } const units = ANCIENT_UNITS[selectedSystem]; let optionsHtml = 'Select a Unit'; for (const unitName in units) { optionsHtml += `${unitName}`; } unitSelect.innerHTML = optionsHtml; unitSelect.disabled = false; }; // --- TAB NAVIGATION LOGIC (Standard implementation) --- const tabs = ['dashboard', 'config']; let currentTabIndex = 0; function updateNavButtons() { prevBtn.disabled = currentTabIndex === 0; nextBtn.disabled = currentTabIndex === tabs.length - 1; prevBtn.style.opacity = prevBtn.disabled ? '0.5' : '1'; nextBtn.style.opacity = nextBtn.disabled ? '0.5' : '1'; } window.switchTab = function(tabName) { const activeTab = document.querySelector('.tab-button.active'); const activeContent = document.querySelector('.tab-content.active'); const nextTabBtn = document.getElementById('tab-btn-' + tabName); const nextTabContent = document.getElementById('tab-content-' + tabName); if (!nextTabBtn || !nextTabContent) return; if (activeTab) activeTab.classList.remove('active'); if (activeContent) activeContent.classList.remove('active'); nextTabBtn.classList.add('active'); nextTabContent.classList.add('active'); currentTabIndex = tabs.indexOf(tabName); updateNavButtons(); }; window.navigateTabs = function(direction) { const newIndex = currentTabIndex + direction; if (newIndex >= 0 && newIndex < tabs.length) { switchTab(tabs[newIndex]); } }; // --- MAIN CONVERSION AND RENDERING --- window.performConversionAndSwitchToDashboard = function() { const system = systemSelect.value; const unitName = unitSelect.value; const inputValue = parseFloat(valueInput.value); if (system === 'none' || unitName === 'none' || isNaN(inputValue) || inputValue <= 0) { alert("Please select a system and unit, and enter a valid positive value."); return; } const unitData = ANCIENT_UNITS[system][unitName]; const baseMeters = unitData.baseMeters; const totalMeters = inputValue * baseMeters; const totalFeet = totalMeters * METER_TO_FOOT; const totalYards = totalMeters * METER_TO_YARD; // --- Metric Conversions --- const resultMeters = totalMeters; const resultKilometers = totalMeters / 1000; // --- Imperial Conversions (Choose best fit: Feet, Yards, or Miles) --- let resultFeet, resultInches; let resultYards = totalYards; let resultMiles = totalFeet / 5280; // --- Determine the most logical imperial and metric display units --- let imperialUnit = 'Feet'; let metricUnit = 'Meters'; // Choose best Imperial unit (Miles if > 1, Yards if > 1, else Feet) if (resultMiles >= 1) { resultMiles = formatNumber(resultMiles) + ' Miles'; imperialUnit = 'Miles'; } else if (resultYards >= 1) { resultYards = formatNumber(resultYards) + ' Yards'; imperialUnit = 'Yards'; } else { resultFeet = formatNumber(totalFeet) + ' Feet'; resultInches = formatNumber(totalFeet * FOOT_TO_INCH) + ' Inches'; imperialUnit = 'Feet / Inches'; } // Choose best Metric unit (Kilometers if > 1, else Meters) if (resultKilometers >= 1) { resultKilometers = formatNumber(resultKilometers) + ' Kilometers'; metricUnit = 'Kilometers'; } else { resultMeters = formatNumber(resultMeters) + ' Meters'; metricUnit = 'Meters'; } // --- Render Summary --- summaryValue.textContent = formatNumber(inputValue); summaryUnit.textContent = unitName; summarySystem.textContent = system; summaryFactorM.textContent = formatNumber(baseMeters); // --- Render Results Table --- let html = ` Metric ${resultMeters || resultKilometers} N/A Imperial ${resultYards || resultFeet} ${resultInches || 'N/A'} `; // If Miles was the best fit for imperial, show it cleanly if (imperialUnit === 'Miles') { html = ` Metric ${resultMeters || resultKilometers} N/A Imperial ${resultMiles} `; } resultsTableBody.innerHTML = html; initialMessage.style.display = 'none'; resultsTable.style.display = 'table'; switchTab('dashboard'); }; // II. C. PDF Download Functionality window.downloadPDF = function() { // III. B. Website Integrity: Use the print media query CSS to hide surrounding elements. window.print(); }; // Initial setup updateUnits(); // Populate initial unit dropdown (disabled) updateNavButtons(); switchTab('dashboard'); });