Center of Gravity (CG): ${cg.toFixed(2)} m

`; resultSection.innerHTML = resultText; resultSection.style.display = 'block'; pdfButton.disabled = false; }; const downloadPDF = () => { if (!currentResults.totalWeight || !resultSection.innerText) { errorMessage.textContent = 'No results available to download.'; errorMessage.style.display = 'block'; return; } try { const { jsPDF } = window.jspdf; if (!jsPDF) { console.error('jsPDF is not loaded.'); errorMessage.textContent = 'PDF generation failed. Please try again.'; errorMessage.style.display = 'block'; return; } const doc = new jsPDF(); doc.setFont('helvetica', 'bold'); doc.setFontSize(16); doc.text('Aircraft Weight & Balance Calculator', 20, 20); doc.setLineWidth(0.5); doc.line(20, 25, 190, 25); doc.setFont('helvetica', 'normal'); doc.setFontSize(12); doc.text(`Empty Weight: ${currentResults.emptyWeight.toFixed(1)} kg`, 20, 40); doc.text(`Empty Arm: ${currentResults.emptyArm.toFixed(2)} m`, 20, 50); doc.text(`Pilot Weight: ${currentResults.pilotWeight.toFixed(1)} kg`, 20, 60); doc.text(`Pilot Arm: ${currentResults.pilotArm.toFixed(2)} m`, 20, 70); doc.text(`Fuel Weight: ${currentResults.fuelWeight.toFixed(1)} kg`, 20, 80); doc.text(`Fuel Arm: ${currentResults.fuelArm.toFixed(2)} m`, 20, 90); doc.text(`Total Weight: ${currentResults.totalWeight.toFixed(1)} kg`, 20, 100); doc.text(`Total Moment: ${currentResults.totalMoment.toFixed(2)} kg·m`, 20, 110); doc.text(`Center of Gravity (CG): ${currentResults.cg.toFixed(2)} m`, 20, 120); doc.setDrawColor(200); doc.rect(15, 35, 180, 90); doc.save('weight_balance.pdf'); } catch (error) { console.error('PDF generation error:', error); errorMessage.textContent = 'Failed to generate PDF. Please try again.'; errorMessage.style.display = 'block'; } }; const resetForm = () => { converterForm.reset(); resultSection.innerHTML = ''; resultSection.style.display = 'none'; errorMessage.style.display = 'none'; pdfButton.disabled = true; currentResults = { emptyWeight: 0, emptyArm: 0, pilotWeight: 0, pilotArm: 0, fuelWeight: 0, fuelArm: 0, totalWeight: 0, totalMoment: 0, cg: 0 }; emptyWeightInput.focus(); }; convertButton.addEventListener('click', calculateWeightBalance); resetButton.addEventListener('click', resetForm); pdfButton.addEventListener('click', downloadPDF); converterForm.addEventListener('submit', (e) => { e.preventDefault(); calculateWeightBalance(); }); }); })();