PDFsharp & MigraDoc Forum

I am have difficulty understand what the x and y values should to rotate a rectangle minus 90 degrees (counter-clockwise rotation)
such that the original rectangle left (x) and top (y) and the position of the rotated triangles left top have the same values as originals top and left.

Assume this code as example:

XImage image = XImage.FromFile(some-filename);
XGraphics gfx = XGraphics.FromPdfPage(page);
XRect rectImg = new(50, 50, 400, 250);
XPoint xpt = new(x, y);
gfx.RotateAtTransform(-90, xpt);
gfx.DrawImage(image, rectImg);
gfx.Dispose();

such that the rotated image bounds are now 50,50,250,350

My question is what should x and y values be to achieve this?

Without testing, I assume the point should be (50, 50).
What have you tried?

See also:
https://www.pdfsharp.net/wiki/XForms-sample.ashx

Save() and Restore() are useful when working with transformations.

_________________
Best regards
Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)