Change of 0,0 reference on page

[Brian Carrier]

Hello,

I am trying to compare the different approaches to solving the page  
rotation problems, but have a fundamental question that I cannot  
figure out the answer to. I'm hoping someone here has more  history  
on it.

The  code currently changes the Y-axis reference so that the 0,0  
point is the upper left corner instead of the lower left corner.   
This is done in PDFStreamEngine.showString(). The rest of the code in  
the project seems to compensate for this, but why is this needed in  
the first place?

thanks,
brian