PLOT88 Library Revision 23 includes the capability to draw contours with filled surface patterns between the contour lines.
Earlier versions on PLOT88 included the function ZCNTUR and ZCSEG to draw contour lines. Revison 23 now offers the addition function CCNTUR to draw the contour lines and add filled surface patterns in color between the contour lines. See below for an comparison of ZCNTUR and CCNTUR. CCNTUR is based on the ACM algorithm 671 (FARB-E-2D) with extensions for bad value processing and 3D representation like the other PLOT88 contour functions. The new function CLEGND draws the contour legend.
Example of contouring using ZCNTUR
Example of contouring using CCNTUR and CLEGND ( Same data as drawn using ZCNTUR above)