HTML Content Destination and Scaling in PDF

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

// Use EVO PDF Namespace
using EvoPdfClient;

namespace EvoHtmlToPdfDemo.Controllers
{
    public class HTML_Content_ScalingController : Controller
    {
        // GET: HTML_Content_Scaling
        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult ConvertHtmlToPdf(IFormCollection collection)
        {
            // Get the server options
            string serverIP = collection["textBoxServerIP"];
            uint serverPort = uint.Parse(collection["textBoxServerPort"]);
            string servicePassword = collection["textBoxServicePassword"];
            bool useServicePassword = servicePassword.Length > 0;
            bool useTcpService = collection["ServerType"] == "radioButtonUseTcpService";
            string webServiceUrl = collection["textBoxWebServiceUrl"];

            // Create the HTML to PDF converter object
            HtmlToPdfConverter htmlToPdfConverter = null;
            if (useTcpService)
                htmlToPdfConverter = new HtmlToPdfConverter(serverIP, serverPort);
            else
                htmlToPdfConverter = new HtmlToPdfConverter(true, webServiceUrl);

            // Set optional service password
            if (useServicePassword)
                htmlToPdfConverter.ServicePassword = servicePassword;

            // Set license key received after purchase to use the converter in licensed mode
            // Leave it not set to use the converter in demo mode
            htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

            // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
            // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
            htmlToPdfConverter.ConversionDelay = 2;

            // Html Viewer Options

            // Set HTML Viewer width in pixels which is the equivalent in converter of the browser window width
            // This is a preferred width of the browser but the actual HTML content width can be larger in case the HTML page 
            // cannot be entirely displayed in the given viewer width
            // This property gives the size of the HTML content which can be further scaled to fit the PDF page based on selected options
            // The HTML content size is in pixels and the PDF page size is in points (1 point = 1/72 inches)
            // The converter is using a 96 DPI resolution to transform pixels to points with the following formula: Points = Pixels/96 * 72            
            htmlToPdfConverter.HtmlViewerWidth = int.Parse(collection["htmlViewerWidthTextBox"]);

            // Set HTML viewer height in pixels to convert the top part of a HTML page 
            // Leave it not set to convert the entire HTML
            if (collection["htmlViewerHeightTextBox"][0].Length > 0)
                htmlToPdfConverter.HtmlViewerHeight = int.Parse(collection["htmlViewerHeightTextBox"]);

            // Set the HTML content clipping option to force the HTML content width to be exactly HtmlViewerWidth pixels
            // If this option is false then the actual HTML content width can be larger than HtmlViewerWidth pixels in case the HTML page 
            // cannot be entirely displayed in the given viewer width
            // By default this option is false and the HTML content is not clipped
            htmlToPdfConverter.ClipHtmlView = collection["clipContentCheckBox"].Count > 0;

            // Set the HTML content zoom percentage similar to zoom level in a browser
            htmlToPdfConverter.HtmlViewerZoom = int.Parse(collection["htmlViewerZoomTextBox"]);

            // PDF Page Options

            // Set PDF page size which can be a predefined size like A4 or a custom size in points 
            // Leave it not set to have a default A4 PDF page
            htmlToPdfConverter.PdfDocumentOptions.PdfPageSize = SelectedPdfPageSize(collection["pdfPageSizeDropDownList"]);

            // Set PDF page orientation to Portrait or Landscape
            // Leave it not set to have a default Portrait orientation for PDF page
            htmlToPdfConverter.PdfDocumentOptions.PdfPageOrientation = SelectedPdfPageOrientation(collection["pdfPageOrientationDropDownList"]);

            // Set PDF page margins in points or leave them not set to have a PDF page without margins
            htmlToPdfConverter.PdfDocumentOptions.LeftMargin = float.Parse(collection["leftMarginTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.RightMargin = float.Parse(collection["rightMarginTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.TopMargin = float.Parse(collection["topMarginTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.BottomMargin = float.Parse(collection["bottomMarginTextBox"]);

            // HTML Content Destination and Spacing Options

            // Set HTML content destination in PDF page
            if (collection["xLocationTextBox"][0].Length > 0)
                htmlToPdfConverter.PdfDocumentOptions.X = float.Parse(collection["xLocationTextBox"]);
            if (collection["yLocationTextBox"][0].Length > 0)
                htmlToPdfConverter.PdfDocumentOptions.Y = float.Parse(collection["yLocationTextBox"]);
            if (collection["contentWidthTextBox"][0].Length > 0)
                htmlToPdfConverter.PdfDocumentOptions.Width = float.Parse(collection["contentWidthTextBox"]);
            if (collection["contentHeightTextBox"][0].Length > 0)
                htmlToPdfConverter.PdfDocumentOptions.Height = float.Parse(collection["contentHeightTextBox"]);

            // Set HTML content top and bottom spacing or leave them not set to have no spacing for the HTML content
            htmlToPdfConverter.PdfDocumentOptions.TopSpacing = float.Parse(collection["topSpacingTextBox"]);
            htmlToPdfConverter.PdfDocumentOptions.BottomSpacing = float.Parse(collection["bottomSpacingTextBox"]);

            // Scaling Options

            // Use this option to fit the HTML content width in PDF page width
            // By default this property is true and the HTML content can be resized to fit the PDF page width
            htmlToPdfConverter.PdfDocumentOptions.FitWidth = collection["fitWidthCheckBox"].Count > 0;

            // Use this option to enable the HTML content stretching when its width is smaller than PDF page width
            // This property has effect only when FitWidth option is true
            // By default this property is false and the HTML content is not stretched
            htmlToPdfConverter.PdfDocumentOptions.StretchToFit = collection["stretchCheckBox"].Count > 0;

            // Use this option to automatically dimension the PDF page to display the HTML content unscaled
            // This property has effect only when the FitWidth property is false
            // By default this property is true and the PDF page is automatically dimensioned when FitWidth is false
            htmlToPdfConverter.PdfDocumentOptions.AutoSizePdfPage = collection["autoSizeCheckBox"].Count > 0;

            // Use this option to fit the HTML content height in PDF page height
            // If both FitWidth and FitHeight are true then the HTML content will resized if necessary to fit both width and height 
            // preserving the aspect ratio at the same time
            // By default this property is false and the HTML content is not resized to fit the PDF page height
            htmlToPdfConverter.PdfDocumentOptions.FitHeight = collection["fitHeightCheckBox"].Count > 0;

            // Use this option to render the whole HTML content into a single PDF page
            // The PDF page size is limited to 14400 points
            // By default this property is false
            htmlToPdfConverter.PdfDocumentOptions.SinglePage = collection["singlePageCheckBox"].Count > 0;

            string url = collection["urlTextBox"];

            // Convert the HTML page to a PDF document using the scaling options
            byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);

            // Send the PDF file to browser
            FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
            fileResult.FileDownloadName = "HTML_Content_Scaling.pdf";

            return fileResult;
        }

        private PdfPageSize SelectedPdfPageSize(string selectedValue)
        {
            switch (selectedValue)
            {
                case "A0":
                    return PdfPageSize.A0;
                case "A1":
                    return PdfPageSize.A1;
                case "A10":
                    return PdfPageSize.A10;
                case "A2":
                    return PdfPageSize.A2;
                case "A3":
                    return PdfPageSize.A3;
                case "A4":
                    return PdfPageSize.A4;
                case "A5":
                    return PdfPageSize.A5;
                case "A6":
                    return PdfPageSize.A6;
                case "A7":
                    return PdfPageSize.A7;
                case "A8":
                    return PdfPageSize.A8;
                case "A9":
                    return PdfPageSize.A9;
                case "ArchA":
                    return PdfPageSize.ArchA;
                case "ArchB":
                    return PdfPageSize.ArchB;
                case "ArchC":
                    return PdfPageSize.ArchC;
                case "ArchD":
                    return PdfPageSize.ArchD;
                case "ArchE":
                    return PdfPageSize.ArchE;
                case "B0":
                    return PdfPageSize.B0;
                case "B1":
                    return PdfPageSize.B1;
                case "B2":
                    return PdfPageSize.B2;
                case "B3":
                    return PdfPageSize.B3;
                case "B4":
                    return PdfPageSize.B4;
                case "B5":
                    return PdfPageSize.B5;
                case "Flsa":
                    return PdfPageSize.Flsa;
                case "HalfLetter":
                    return PdfPageSize.HalfLetter;
                case "Ledger":
                    return PdfPageSize.Ledger;
                case "Legal":
                    return PdfPageSize.Legal;
                case "Letter":
                    return PdfPageSize.Letter;
                case "Letter11x17":
                    return PdfPageSize.Letter11x17;
                case "Note":
                    return PdfPageSize.Note;
                default:
                    return PdfPageSize.A4;
            }
        }

        private PdfPageOrientation SelectedPdfPageOrientation(string selectedValue)
        {
            return (selectedValue == "Portrait") ? PdfPageOrientation.Portrait : PdfPageOrientation.Landscape;
        }
    }
}