- <init>
Constructor.
- YMATCH
- getIntersectRatio
Returns the ratio of (zc - z0) / (z1 - z0)
- init
Initialize the contour lines.
- isIntersect
Returns true if zc is between z0 and z1.
- segdir
Determine the entry direction to the next cell and update the cell indices.
- segupdate
Search seglist for a segment with endpoint (xend, yend). The cell entry
direction is dir, and if tai