[plt-scheme] Bitmap scalling

Hello Everyone.

I have recently started to learn Scheme and I am also trying to create 
my own form of "texture mapping".
The major problem I have encountered is the inability to scale and draw 
bitmaps. Is there anyway to get some kind of extension for my Dr.Scheme 
to enable me to scale and draw bitmaps? Or is there another method to do 
this? I am running on Windows. I read somewhere that there was no 
scaling due to the diffuclity with scaling for X. However, is there 
anyway to simply allow the Windows and Mac users to scale bitmaps?

-Thank you, Phil