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gridxy
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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
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