section g of routines in graph.i

Home Manual Packages Global Index Keywords Quick Reference | # functions in graph.i - g
gridxy |
                 gridxy, flag
              or gridxy, xflag, yflag

         Turns on or off grid lines according to FLAG.  In the first form, both
         the x and y axes are affected.  In the second form, XFLAG and YFLAG
         may differ to have different grid options for the two axes.  In either
         case, a FLAG value of 0 means no grid lines (the default), a value of
         1 means grid lines at all major ticks (the level of ticks which get
         grid lines can be set in the style sheet), and a FLAG value of 2 means
         that the coordinate origin only will get a grid line.  In styles with
         multiple coordinate systems, only the current coordinate system is
         affected.
         The keywords can be used to affect the style of the grid lines.
         You can also turn the ticks off entirely.  (You might want to do this
         to plot your own custom set of tick marks when the automatic tick
         generating machinery will never give the ticks you want.  For example
         a latitude axis in degrees might reasonably be labeled "0, 30, 60,
         90", but the automatic machinery considers 3 an "ugly" number - only
         1, 2, and 5 are "pretty" - and cannot make the required scale.  In
         this case, you can turn off the automatic ticks and labels, and use
         plsys, pldj, and plt to generate your own.)
         To fiddle with the tick flags in this general manner, set the
         0x200 bit of FLAG (or XFLAG or YFLAG), and "or-in" the 0x1ff bits
         however you wish.  The meaning of the various flags is described
         in the file Y_SITE/gist/work.gs.  Additionally, you can use the
         0x400 bit to turn on or off the frame drawn around the viewport.
         Here are some examples:
            gridxy,0x233        work.gs default setting
            gridxy,,0x200       like work.gs, but no y-axis ticks or labels
            gridxy,,0x231       like work.gs, but no y-axis ticks on right
            gridxy,0x62b        boxed.gs default setting
         The three keywords base60=, degrees=, and hhmm= can be used to get
         alternative tick intervals for base 60 systems instead of the
         usual base 10 systems.  The keyword values are 0 to restore the
         default behavior, 1 to set the feature for the x axis, 2 to set it
         for the y axis, and 3 to set it for both axes.  The base60 feature
         allows ticks and labels at multiples of 30 (up to +-3600).  The
         degrees feature causes labels to be printed modulo 360 (so that a
         scale which runs from, say, 90 to 270 will be printed as 90 to 180
         then -180 to -90, mostly for longitude scales).  The hhmm feature
         causes labels to be printed in the form hh:mm (so that, for example,
         150 will be printed as 02:30, mostly for time of day scales).
       KEYWORDS: color, type, width, base60, degrees, hhmm

    builtin function, documented at i0/graph.i   line 737
SEE ALSO: | window, plsys, limits, range, logxy, viewport