grafx - Extensible Java Graphics Package Code

Simplifying function setPix2().

Cleaning up some usages of m_normalizedFront.

Adding an important TODO comment.

In line interpolated line drawing routinges, shifting the color component
computation space, adding an offset of 256.0, so that casts to float etc. would
drop the accumulation error.

In constant color line drawing functions, the cast of z value from double to
float to int now takes place in a place which is offset by m_normalizedFront,
so that proximity to zero is avoided, which would have failed to drop
accumulated errors as effectively. I still have some work to do, esp. in the
code that interpolates colors, as the color components need the same treatment.
Polygon filling also needs to be updated eventually. Right now both worlds can
coexist because I have parallel sets of variables or functions.

Fixing a small typo in constant color line drawing routine. This error was
introduced as some point by accident.

Streamlining the constant color line drawing routines, no longer accessing
array members in the inner loop.

Using m_foff in the constant color line drawing routines.

In color interpolated line drawing code, doing more accurate aliasing
computations for xx and yy, by using m_foff.

Adding a new level 30. It's a 7x5 pit with only sixer blocks.