Resize image with respect to header and footer size

GemBox.Document
1

Hello GemBox team,

I am trying to add the image to my docx file and then convert it to PDF.

As the footer and header size may vary depending on the content, I cannot find a way to calculate the size of the image to insert properly. Regardless of the content, the margins in Page Setup are always the same.

Is there a way to properly calculate the size of footers/headers or add the auto sizing of the image based on the page content?

If I add the image as is, it crops up to fit the document. I am not sure how to send the files properly, but I think it is easily reproducible with any rather big image.

I would be thankful for any advice

Thank you,
Oleksandr

2

Hi Oleksandr,

The only way to do this is to calculate the remaining space on the page, which is a bit tricky because it involves using the rendering engine.

For example, let’s say you have the following document:

input-document
input-document960×1040 32.2 KB

Now, to calculate this area between the current default header and default footer, you would need something like this:

var document = DocumentModel.Load("input.docx");

var section = document.Sections[0];
var headerDefault = section.HeadersFooters[HeaderFooterType.HeaderDefault];
var footerDefault = section.HeadersFooters[HeaderFooterType.FooterDefault];

var page = document.GetPaginator().Pages[0];
var lastHeaderElementLayout = page.GetElementLayout(headerDefault.Blocks.Last());
var firstFooterElementLayout = page.GetElementLayout(footerDefault.Blocks.First());

var pageSetup = section.PageSetup;

double pageHeight = firstFooterElementLayout.VerticalPosition.Value
    - firstFooterElementLayout.Size.Height
    - lastHeaderElementLayout.VerticalPosition.Value;

double pageWidth = pageSetup.PageWidth
    - pageSetup.PageMargins.Left
    - pageSetup.PageMargins.Right;

And to add the resized Picture, you would need something like this:

var picture = new Picture(document, "image.png");
var pictureLayout = picture.Layout;
var pictureSize = pictureLayout.Size;

double ratioX = pageWidth / pictureSize.Width;
double ratioY = pageHeight / pictureSize.Height;
double ratio = Math.Min(ratioX, ratioY);
if (ratio < 1)
    pictureLayout.Size = new Size(pictureSize.Width * ratio, pictureSize.Height * ratio);

section.Content.End.InsertRange(picture.Content);
document.Save("output.docx");

The following is a screenshot of the resulting “output.docx” file:

output-document
output-document960×1040 46.4 KB

I hope this helps.

Regards,
Mario

3

Hello Mario,

I have tried a similar approach by rendering it to PDF and then replacing the picture with a properly calculated one.

From your response, I can understand that there is no simple way of calculating the proper margins for the image. And since your version is more performant and elegant I will stick to it!

Thanks much for the quick reply!