I've got a latex macro that makes small pictures. In that picture I need to draw area. Borders of that area are quadratic bezier curves and that area is to be filled. I did not know how to do it so currently I'm "filling" the area by drawing a plenty of bezier curves inside it...

This slows down typeseting and when a macro is used multiple times (so tex is drawing really a lot of quadratic bezier curves) it produces following error:

! TeX capacity exceeded, sorry [main memory size=3000000].

How can I prevent this error ? (by freeing memory after macro or such...) Or even better how do I fill the area determined by two quadratic bezier curves?

Code that produces error:

\usepackage{forloop}
\usepackage{picture}
\usepackage{eepic}
...
\linethickness{\lineThickness\unitlength}%
\forloop[\lineThickness]{cy}{\cymin}{\value{cy} < \cymax}{%
  \qbezier(\ax, \ay)(\cx, \value{cy})(\bx, \by)%
}%

Here are some example values for variables:

\setlength{\unitlength}{0.01pt}
\lineThickness=20
%cy is just a counter - inital value is not important
\cymin=450 \cymax=900
%from following only the difference between \ax and \bx is important
\ax=0 \ay=0 \bx=550 \by=0

Note: To reproduce the error this code have to execute approximately 150 times (could be more depending on your latex memory settings).

Thanks a lot for any help