Image aspect ratio using Reportlab in Python

Question

I want to insert an image inside a frame. I found two ways to do this:

1. drawImage(self, image, x, y, width=None, height=None, mask=None, preserveAspectRatio=False, anchor='c')
2. Image(filename, width=None, height=None)

My question is: how can I add an image in a frame while preserving its aspect ratio?

from reportlab.lib.units import cm
from reportlab.pdfgen.canvas import Canvas
from reportlab.platypus import Frame, Image

c = Canvas('mydoc.pdf')
frame = Frame(1*cm, 1*cm, 19*cm, 10*cm, showBoundary=1)

"""
If I have a rectangular image, I will get a square image (aspect ration 
will change to 8x8 cm). The advantage here is that I use coordinates relative
to the frame.
"""
story = []
story.append(Image('myimage.png', width=8*cm, height=8*cm))
frame.addFromList(story, c)

"""
Aspect ration is preserved, but I can't use the frame's coordinates anymore.
"""
c.drawImage('myimage.png', 1*cm, 1*cm, width=8*cm, preserveAspectRatio=True)

c.save()

Answer 1

i had a similar problem and i think this works:

   image = Image(absolute_path)
   image._restrictSize(1 * inch, 2 * inch)
   story.append(image)

I hope this helps!

Answer 2

I am super-late on this one, not sure when it was added but now the constructor for Image allows type='proportional' to be specified which will achieve the same desired output.