How to position the viewport

[rafcon-dev]

Hello!
First, let me thank you for the great work in ACadSharp!
I'm trying to export a dxf file that I'm creating programatically, but I can't for the life of me position and scale things as I want. Here's the code that I have, it's probably very wrong, whatever I do my document is always glued to the margins of the page, with a bit cropped on top (maybe because it might be on negative coordinates?

private bool SavePDF(string filePath, CadDocument cadDoc)
    {
        if (cadDoc == null)
        {
            GD.PrintErr("SavePDF: CadDocument is null!");
            return false;
        }

        try
        {
            Layout layout = new Layout("FullDocumentLayout");
            layout.MinExtents = new XYZ(-500, -500, 0);
            layout.MaxExtents = new XYZ(2970, 2100, 0); // Example: A4 size in mm
            layout.MinLimits = new XY(-500, -500);
            layout.MaxLimits = new XY(2970, 2100);
            
            cadDoc.Layouts.Add(layout);
            //cadDoc.BlockRecords.Add(layout.AssociatedBlock);
            
            XY drawingMin = new XY(double.MaxValue, double.MaxValue);
            XY drawingMax = new XY(double.MinValue, double.MinValue);

            foreach (var entity in cadDoc.Entities)
            {
                var bBox = entity.GetBoundingBox();

                if (bBox.Min.X < drawingMin.X) drawingMin.X = bBox.Min.X;
                if (bBox.Min.Y < drawingMin.Y) drawingMin.Y = bBox.Min.Y;
                if (bBox.Max.X > drawingMax.X) drawingMax.X = bBox.Max.X;
                if (bBox.Max.Y > drawingMax.Y) drawingMax.Y = bBox.Max.Y;
            }

            var viewport = new ACadSharp.Entities.Viewport()
            {
                Center = new XYZ((drawingMin.X + drawingMax.X) / 2, (drawingMin.Y + drawingMax.Y) / 2, 0),
                Width = drawingMax.X - drawingMin.X+500,
                Height = drawingMax.Y - drawingMin.Y+500,
                ViewCenter = new XY((drawingMin.X + drawingMax.X) / 2, (drawingMin.Y + drawingMax.Y) / 2)
            };
            
            //layout.Viewports = new ViewportCollection();
            layout.Viewports.Append(viewport);
            layout.AssociatedBlock.Entities.Add(viewport);
            //cadDoc.PaperSpace.Entities.Add(viewport);w

            PdfExporter exporter = new PdfExporter(filePath);
			exporter.AddModelSpace(cadDoc);
            exporter.AddPaperLayouts(cadDoc);
			exporter.Close();

            GD.Print($"Successfully saved PDF to: {filePath}");
            return true;
        }
        catch (System.Exception e)
        {
            GD.PrintErr($"Error saving PDF file: {e.Message}");
            return false;
        }
    }

Basically I'd like to be able to position my entities on the center of a A4 or A3 page, with some margin from the borders of the page.

Many thanks!

[DomCR]

Hi @rafcon-dev,

The Pdf module is still in a early alpha, the current features are a base but they will probably change radically.

I'm sorry to inform that right now I think there is no way to achieve what you want, I'm currently working on the transformation and visual features so I can start the work on this repo, as soon as I go back to this one I'll post the response or implement the needed feature for this.

Thanks for your support! I hope I can take this one soon.

[rafcon-dev]

Thank you for your answer!
Ah, that's too bad!
I ended up making a workaround by saving the dxf exported from ACadSharp to a temp file, and using librecad from the command line to convert to pdf. Not ideal of course, but it works.
Maybe you could repurpose Librecad's code and it integrate it nicely with this project? Maybe even as a dll or something.
There's even this https://github.com/xanderdin/LibreCAD_dxf2pdf_standalone, which extracts only the relevant parts, but it's potentially out of date.
Still probably easier than implementing everything from scratch!
Best wishes, thanks a bunch again!