${result.toFixed(6)}

(Using Simpson's rule with n=${n} intervals)

`; // Store result for PDF and show button lastResult = { funcStr: funcStr, lowerLimit: a, upperLimit: b, integralValue: result, intervals: n }; pdfButton.style.display = 'block'; // Render LaTeX if MathJax is available (Optional - Elementor might need configuration) if (typeof MathJax !== 'undefined') { MathJax.typesetPromise([resultArea]); } } catch (error) { handleError(`Calculation Error: ${error.message}. Check function syntax and limits.`); console.error(error); } } function handleError(message) { errorMessageDiv.textContent = message; resultArea.innerHTML = '

Please correct the errors and try again.

'; // Clear calculation message pdfButton.style.display = 'none'; lastResult = null; } function generatePdf() { if (!lastResult) { alert('No result available to download.'); return; } // Ensure jsPDF is loaded if (typeof jspdf === 'undefined' || typeof jspdf.jsPDF === 'undefined') { alert('Error: jsPDF library is not loaded.'); console.error('jsPDF not loaded'); return; } const { jsPDF } = jspdf; // Destructure jsPDF const doc = new jsPDF(); // Get computed styles for colors const computedStyle = getComputedStyle(document.querySelector('.integral-calculator-container')); const primaryColor = computedStyle.getPropertyValue('--calc-primary-color').trim(); const textColor = computedStyle.getPropertyValue('--calc-text-color').trim(); const bgColor = computedStyle.getPropertyValue('--calc-secondary-color').trim(); // Use for background elements if needed // --- PDF Content --- const pageHeight = doc.internal.pageSize.height; const pageWidth = doc.internal.pageSize.width; let currentY = 20; // Starting Y position // Title doc.setFontSize(18); doc.setTextColor(primaryColor); doc.text('Integral Calculation Result', pageWidth / 2, currentY, { align: 'center' }); currentY += 15; // Input Details Section doc.setFontSize(14); doc.setTextColor(primaryColor); doc.text('Input Parameters', 15, currentY); currentY += 8; doc.setFontSize(12); doc.setTextColor(textColor); doc.text(`Function f(x): ${lastResult.funcStr}`, 15, currentY); currentY += 7; doc.text(`Lower Limit (a): ${lastResult.lowerLimit}`, 15, currentY); currentY += 7; doc.text(`Upper Limit (b): ${lastResult.upperLimit}`, 15, currentY); currentY += 12; // Result Section doc.setFontSize(14); doc.setTextColor(primaryColor); doc.text('Calculation Result', 15, currentY); currentY += 8; doc.setFontSize(12); doc.setTextColor(textColor); // Trying to represent the integral - jsPDF doesn't support complex math notation easily doc.text(`Approximate value of integral from ${lastResult.lowerLimit} to ${lastResult.upperLimit} of f(x) dx:`, 15, currentY); currentY += 7; doc.setFontSize(14); doc.setFont(undefined, 'bold'); // Use 'bold' style doc.setTextColor(primaryColor); doc.text(`${lastResult.integralValue.toFixed(8)}`, 15, currentY); // Display with more precision currentY += 7; doc.setFont(undefined, 'normal'); // Reset style doc.setFontSize(10); doc.setTextColor(textColor); doc.text(`(Calculated using Simpson's rule with n=${lastResult.intervals} intervals)`, 15, currentY); currentY += 15; // Footer (Optional) const generatedDate = new Date().toLocaleString(); doc.setFontSize(9); doc.setTextColor('#888888'); // Grey color for footer doc.text(`Generated on: ${generatedDate}`, 15, pageHeight - 10); doc.text('Integral Calculator Tool', pageWidth - 15, pageHeight - 10, { align: 'right' }); // --- End PDF Content --- // Save the PDF try { doc.save('integral_result.pdf'); } catch (e) { alert('Error generating PDF. See console for details.'); console.error("jsPDF Error:", e); } } // Optional: If MathJax is used on the site, re-render on input change or result display // This requires MathJax to be loaded globally on your WordPress site. // Example: if (typeof MathJax !== 'undefined') { MathJax.typesetPromise(); } });