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I want to draw an image on top a PDF but maintain its aspect ratio. It would also be good if I could control its rotation and alignment.

It's possible to preserve the aspect ratio and control the rotation and alignment of an image when adding it to a PDF file by using the FitImage function instead of the DrawImage function.

Here is some JScript sample code that demonstrates how to do this:

// Load a sample image into memory

QP.AddImageFromFile("temp.bmp", 1);

// Set page size as A4

QP.SetPageSize("A4");

// Get the width and height of the page

lWidth = QP.PageWidth();
lHeight = QP.PageHeight(); 

// Draw the image onto the page using the specified width/height

QP.FitImage(0, lHeight, lWidth, lHeight, 1, 1, 0);

// Store the updated PDF where you like

QP.SaveToFile("temp.pdf");