Fun with numbers - dammit, but I want a cast!

[Graham Nicholls]

Hi.

I'm having some fun with numbers.  I've extraced an image sizes from a jpeg
file

        img_x,img_y=image.getsize()

then I'm trying to  use those sizes to scale the image, but because python
has decided that they are integers, I keep getting division by zero errors

eg      
        xscale=xframe/img_x

where xframe will be say 300, and img_x will be 1800
xscale has the value 0.

I've tried doing img_x=1.0 to force it to be a float, but I'm getting a bit
frustrated as it seems to make no difference - once image.getsize returns
the (integer) value of the x size, it simply converts back to an int.  I've
tried this at the command line, and it seems to confirm that behaviour -
eg:
graham at rocklap:~/work/hsb/pdflive> python
Python 2.3b1 (#3, Jun 17 2003, 23:06:11)
[GCC 3.3 20030226 (prerelease) (SuSE Linux)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x=1.0
>>> xf=1.0
>>> scale=1.0
>>> x=1800
>>> xf=300
>>> scale=xf/x
>>> scale
0
>>> 




Heres the relevant code in full:

        img_x=1.0
        img_y=1.0
        img_x,img_y=image.getsize()
        except "Not_JPEG":
        if warn:
                print ("WARNING: Image file %s is not a jpeg file" % fname)
                sys.exit(OPEN_ERR)
# How many pixels per mm do we have
#       On a4 paper, using pdfrw ? Docs seem to suggest between 60-160 
#       which seems a lot.
                                
        xscale=1.0
        yscale=1.0
        scale=1.0
        xscale=1/(xframe/img_x)
        yscale=1/(yframe/img_y)
        #import pdb
        #pdb.set_trace()
        print ("xscale=%f,yscale=%f"  %(xscale,yscale))
        scale=min(xscale,yscale) * 100
        print ("xframe=%d,yframe=%d, x=%d,y=%d scale=%f\n" %(xframe,  yframe,
img_x, img_y, scale))
                                        
I'd really appreciate some help, thanks!
Graham
-- 
Graham Nicholls
Rock Computer Consultancy