grafx - Extensible Java Graphics Package Code

In line drawing routines, now that m_lineClip has the correct boundaries, when
we go to compute xMin, yMin, xMax, and yMax for the pixels, we no longer need
the assistance of Math.min() and Math.max(), in other words we no longer use
m_clipXMin, m_clipYMin, m_clipXMax, and m_clipYMax as boundaries. This is a
rather delicate change but theoretically everything should work. Some simple
tests show that things still work the way they're supposed to. Unfortunately
I don't have extensive regression tests at the moment.

Modifying m_lineClip to use pixelLowerBound() and pixelUpperBound().

Adding LineIntegrityCheck1 and LineIntegrityCheck2.

Adding pixelUpperBound() and pixelLowerBound().

Rearranging location of code snippets.

Did some basic tests of fixed 3D rendering code; it works.

Fixing the degenerate cases in line drawing.

Removing the s_strategy nonsense.

Embellishing the top-level class Javadoc.

Now clipping lines and polygons on the slightly offset z planes.