**CIGAL Reference Manual, Chapter 4 (Variables): gflags**
===== Gflags -- Integer variable controlling vector graphics options =====
**usage:  gflags = value**

GFLAGS is an internally defined integer variable controlling options
related to how vector graphics operations are executed.  The value of
the GFLAGS parameter can be changed at any time and remains set until
it is explicitly modified again.  The meaning of the GFLAGS settings
are summarized below.  Levels can be combined by adding values.

      Value   (octal)  Meaning
        1        1o    Ignore vector projection settings (scale, rotate, offset)
                        and all other GFLAGS options (except 2)
        2        2o    Don't draw vectors (do other mappings if set)
        4        4o    Make Z-value map when drawing vectors
        8       10o    Draw YZ projection
       16       20o    Draw XY as well as YZ or XZ projections
       32       40o    Draw XZ projection
       64      100o    Measure line width along the vector pathway
      128      200o    XOR new pixels instead of replacing them
      256      400o    Use software line drawing routine
     1024     2000o    Sample intensity values along the vector pathway
     2048     4000o    Zoom pixels X 2
     4096    10000o    Zoom pixels X 4
     6144    14000o    Zoom pixels X 8
     8192    20000o    Flip Y axis (within window ^^7) for cursor and drawing

**See Also:**\\
[[jvs:cigal|CIGAL Home]], 
[[jvs:cigal:manual|CIGAL Manual]], 
[[jvs:cigal:manual:chapter4|Variables List]], 
[[jvs:cigal:manual:help|Manual Help]]