grafx - Extensible Java Graphics Package Code

Not passing m_line as parameter to the four line drawing subroutines, since
that is as much private and is as much a member variable as are the four
subroutines. Using m_line directly from the four subroutines.

Beginning to add comment explaining line strategy.

Trying to draw vertex normals, it sort of works actually.

Adding TODO comment.

Advancing a little bit on the 3D line drawing.

Adding increments for zCurr. Not using z buffer yet. Line drawing.

Computing zCurr.

Adding comment which explains derivation of formula for zStart.

Adding quick TODO comment.

In line drawing subroutine, renaming 'x' to 'xx' and 'y' to 'yy' because those
are easier to grep for.