EVO HTML to PDF Converter

Add Image Elements to a PDF Document

EVO HTML to PDF Converter for .NET Documentation

EVO HTML to PDF Converter allows you to add images to a PDF document. An image element is represented in API by an EvoPdfImageElement object.

You can draw unscaled images to a PDF document, scale images to fit a given box either preserving or not the aspect ratio and you can draw transparent images and rotated images in a PDF document.

Code Sample - Add Image Elements to a PDF Document
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protected void createPdfButton_Click(object sender, EventArgs e)
{
    // Create a PDF document
    Document pdfDocument = new Document();

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

    try
    {
        // The result of adding elements to PDF document
        AddElementResult addElementResult = null;

        // The titles font used to mark various sections of the PDF document
        PdfFont titleFont = pdfDocument.AddFont(new Font("Times New Roman", 12, FontStyle.Bold, GraphicsUnit.Point));
        PdfFont subtitleFont = pdfDocument.AddFont(new Font("Times New Roman", 8, FontStyle.Bold, GraphicsUnit.Point));

        // The position on X anf Y axes where to add the next element
        float yLocation = 5;
        float xLocation = 5;

        // Create a PDF page in PDF document
        PdfPage pdfPage = pdfDocument.AddPage();

        // Add section title
        TextElement titleTextElement = new TextElement(xLocation, yLocation, "Images Scaling", titleFont);
        titleTextElement.ForeColor = Color.Black;
        addElementResult = pdfPage.AddElement(titleTextElement);
        yLocation = addElementResult.EndPageBounds.Bottom + 10;
        pdfPage = addElementResult.EndPdfPage;

        float titlesYLocation = yLocation;

        // Add an unscaled image

        // Add section title
        TextElement subtitleTextElement = new TextElement(xLocation, titlesYLocation, "Unscaled small image with normal resolution", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        addElementResult = pdfPage.AddElement(subtitleTextElement);

        pdfPage = addElementResult.EndPdfPage;
        float imagesYLocation = addElementResult.EndPageBounds.Bottom + 10;

        string imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/picture_small.jpg");
        ImageElement unscaledImageElement = new ImageElement(xLocation, imagesYLocation, imagePath);
        addElementResult = pdfPage.AddElement(unscaledImageElement);

        RectangleF scaledDownImageRectangle = new RectangleF(addElementResult.EndPageBounds.Right + 30, addElementResult.EndPageBounds.Y,
                    addElementResult.EndPageBounds.Width, addElementResult.EndPageBounds.Height);

        // Add a large image scaled down to same size in PDF

        // Add section title
        subtitleTextElement = new TextElement(scaledDownImageRectangle.X, titlesYLocation, "Scaled down large image has higher resolution", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        pdfPage.AddElement(subtitleTextElement);

        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/picture_large.jpg");
        ImageElement scaledDownImageElement = new ImageElement(scaledDownImageRectangle.X, scaledDownImageRectangle.Y, scaledDownImageRectangle.Width, imagePath);
        AddElementResult scaledDownImageResult = pdfPage.AddElement(scaledDownImageElement);

        // Add a border around the scaled down image
        RectangleElement borderElement = new RectangleElement(scaledDownImageRectangle);
        pdfPage.AddElement(borderElement);

        // Add an unscaled small image

        float columnX = scaledDownImageResult.EndPageBounds.Right + 30;

        // Add section title
        subtitleTextElement = new TextElement(columnX, titlesYLocation, "Unscaled small image", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        pdfPage.AddElement(subtitleTextElement);

        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/picture_smaller.jpg");
        unscaledImageElement = new ImageElement(columnX, imagesYLocation, imagePath);
        AddElementResult unscaledImageResult = pdfPage.AddElement(unscaledImageElement);

        RectangleF unscaledImageRectangle = unscaledImageResult.EndPageBounds;

        // Add an enlarged image

        // Add section title
        subtitleTextElement = new TextElement(columnX, unscaledImageRectangle.Bottom + 10, "Enlarged small image has lower resolution", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        AddElementResult enlargedImageTitle = pdfPage.AddElement(subtitleTextElement);

        float enlargedImageWidth = unscaledImageRectangle.Width + 35;

        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/picture_smaller.jpg");
        ImageElement enlargedImageElement = new ImageElement(columnX, enlargedImageTitle.EndPageBounds.Bottom + 10, enlargedImageWidth, imagePath);
        // Allow the image to be enlarged
        enlargedImageElement.EnlargeEnabled = true;
        AddElementResult enalargedImageResult = pdfPage.AddElement(enlargedImageElement);

        yLocation = addElementResult.EndPageBounds.Bottom + 10;

        // Scale an image preserving the aspect ratio

        titlesYLocation = yLocation;

        // Add section title
        subtitleTextElement = new TextElement(xLocation, titlesYLocation, "Scaled down image preserving aspect ratio", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        addElementResult = pdfPage.AddElement(subtitleTextElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 10;

        RectangleF boundingRectangle = new RectangleF(xLocation, yLocation, scaledDownImageRectangle.Width, scaledDownImageRectangle.Width);
        imagesYLocation = boundingRectangle.Y;

        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/landscape.jpg");
        ImageElement keepAspectImageElement = new ImageElement(boundingRectangle.X, imagesYLocation, boundingRectangle.Width, boundingRectangle.Width, true, imagePath);
        addElementResult = pdfPage.AddElement(keepAspectImageElement);

        borderElement = new RectangleElement(boundingRectangle);
        borderElement.ForeColor = Color.Black;
        pdfPage.AddElement(borderElement);

        // Scale an image without preserving aspect ratio
        // This can produce a distorted image

        boundingRectangle = new RectangleF(addElementResult.EndPageBounds.Right + 30, addElementResult.EndPageBounds.Y, scaledDownImageRectangle.Width, scaledDownImageRectangle.Width);

        // Add section title
        subtitleTextElement = new TextElement(boundingRectangle.X, titlesYLocation, "Scaled down image without preserving aspect ratio", subtitleFont);
        subtitleTextElement.ForeColor = Color.Navy;
        pdfPage.AddElement(subtitleTextElement);

        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/landscape.jpg");
        ImageElement notKeepAspectImageElement = new ImageElement(boundingRectangle.X, imagesYLocation, boundingRectangle.Width, boundingRectangle.Width, false, imagePath);
        addElementResult = pdfPage.AddElement(notKeepAspectImageElement);

        borderElement = new RectangleElement(boundingRectangle);
        borderElement.ForeColor = Color.Black;
        pdfPage.AddElement(borderElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 20;

        // Add transparent images

        // Add section title
        titleTextElement = new TextElement(xLocation, yLocation, "Transparent Images", titleFont);
        titleTextElement.ForeColor = Color.Black;
        addElementResult = pdfPage.AddElement(titleTextElement);
        yLocation = addElementResult.EndPageBounds.Bottom + 10;
        pdfPage = addElementResult.EndPdfPage;

        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/transparent.png");
        ImageElement trasparentImageElement = new ImageElement(xLocation, yLocation, 150, imagePath);
        addElementResult = pdfPage.AddElement(trasparentImageElement);

        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/rose.png");
        trasparentImageElement = new ImageElement(addElementResult.EndPageBounds.Right + 60, yLocation + 20, 150, imagePath);
        pdfPage.AddElement(trasparentImageElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 20;

        // Rotate images

        // Add section title
        titleTextElement = new TextElement(xLocation, yLocation, "Rotated Images", titleFont);
        titleTextElement.ForeColor = Color.Black;
        addElementResult = pdfPage.AddElement(titleTextElement);
        yLocation = addElementResult.EndPageBounds.Bottom + 10;
        pdfPage = addElementResult.EndPdfPage;

        // Add a not rotated image
        imagePath = Server.MapPath("~/DemoAppFiles/Input/Images/compass.png");
        ImageElement noRotationImageElement = new ImageElement(xLocation, yLocation, 125, imagePath);
        addElementResult = pdfPage.AddElement(noRotationImageElement);

        float imageXLocation = addElementResult.EndPageBounds.X;
        float imageYLocation = addElementResult.EndPageBounds.Y;
        float imageWidth = addElementResult.EndPageBounds.Width;
        float imageHeight = addElementResult.EndPageBounds.Height;

        // The rotated coordinates system location
        float rotatedImageXLocation = imageXLocation + imageWidth + 20 + imageHeight;
        float rotatedImageYLocation = imageYLocation;

        // Add the image rotated 90 degrees
        ImageElement rotate90ImageElement = new ImageElement(0, 0, 125, imagePath);
        rotate90ImageElement.Translate(rotatedImageXLocation, rotatedImageYLocation);
        rotate90ImageElement.Rotate(90);
        pdfPage.AddElement(rotate90ImageElement);

        rotatedImageXLocation += 20 + imageWidth;
        rotatedImageYLocation = imageYLocation + imageHeight;

        // Add the image rotated 180 degrees
        ImageElement rotate180ImageElement = new ImageElement(0, 0, 125, imagePath);
        rotate180ImageElement.Translate(rotatedImageXLocation, rotatedImageYLocation);
        rotate180ImageElement.Rotate(180);
        pdfPage.AddElement(rotate180ImageElement);

        rotatedImageXLocation += 20;
        rotatedImageYLocation = imageYLocation + imageWidth;

        // Add the image rotated 270 degrees
        ImageElement rotate270ImageElement = new ImageElement(0, 0, 125, imagePath);
        rotate270ImageElement.Translate(rotatedImageXLocation, rotatedImageYLocation);
        rotate270ImageElement.Rotate(270);
        pdfPage.AddElement(rotate270ImageElement);

        pdfPage = addElementResult.EndPdfPage;
        yLocation = addElementResult.EndPageBounds.Bottom + 20;

        // Save the PDF document in a memory buffer
        byte[] outPdfBuffer = pdfDocument.Save();

        // Send the PDF as response to browser

        // Set response content type
        Response.AddHeader("Content-Type", "application/pdf");

        // Instruct the browser to open the PDF file as an attachment or inline
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Image_Elements.pdf; size={0}", outPdfBuffer.Length.ToString()));

        // Write the PDF document buffer to HTTP response
        Response.BinaryWrite(outPdfBuffer);

        // End the HTTP response and stop the current page processing
        Response.End();
    }
    finally
    {
        // Close the PDF document
        pdfDocument.Close();
    }
}