How to Zoom fitz.Pixmap to precise size

[dmytro-balabukh]

I need my PDF page to gently fit the borders of the Reading Window. I intend to do it like, QScrollArea doesn't activate, but it's near to it, also all proportions must be saved. In Matrix, I can't give exact height, width, so what can you suggest?

I'm using:
PyQT5
The Window you see is:
QScrollArea, which has QLabel inside

[JorjMcKie]

Without going into Qt details (because I am not very acquainted with it, as I mostly using wxPython):

• you want to make sure that the available area is best used by the page's pixmap: at least one of its width or height is exhausted
• call the area's dimensions WIDTH, resp. HEIGHT, and the page's dimension width, resp height (i.e. page.rect.width, page.rect.height)
• then compute the pixmap and the QImage like this

if width / height < WIDTH / HEIGHT:
    zoom = HEIGHT / height
else:
    zoom = WIDTH / width
mat = fitz.Matrix(zoom, zoom)
pix = page.getPixmap(matrix=mat, alpha=False)
qimg = QImage(pix.samples, pix.width, pix.height, pix.stride, QImage.Format_RGB888)