1PLMERIDIANS(3plplot)              PLplot API              PLMERIDIANS(3plplot)
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NAME

6       plmeridians - Plot latitude and longitude lines
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SYNOPSIS

9       plmeridians(mapform, dlong, dlat, minlong, maxlong, minlat, maxlat)
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DESCRIPTION

12       Displays  latitude  and  longitude  on the current plot.  The lines are
13       plotted in the current color and line style.
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15       Redacted form: plmeridians(mapform, dlong, dlat, minlong, maxlong, min‐
16       lat, maxlat)
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18       This function is used in example 19.
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ARGUMENTS

21       mapform (PLMAPFORM_callback(3plplot), input)
22              A  user supplied function to transform the coordinate longitudes
23              and latitudes to a plot coordinate system. By using this  trans‐
24              form,  we  can change from a longitude, latitude coordinate to a
25              polar   stereographic   project,   for   example.     Initially,
26              x[0]..[n-1]  are  the longitudes and y[0]..y[n-1] are the corre‐
27              sponding latitudes.  After the call to mapform(),  x[]  and  y[]
28              should  be replaced by the corresponding plot coordinates. If no
29              transform is desired, mapform can be replaced by NULL.
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31       dlong (PLFLT(3plplot), input)
32              The interval in degrees at which the longitude lines are  to  be
33              plotted.
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35       dlat (PLFLT(3plplot), input)
36              The  interval  in  degrees at which the latitude lines are to be
37              plotted.
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39       minlong (PLFLT(3plplot), input)
40              The value of the longitude on the left side  of  the  plot.  The
41              value of minlong must be less than the value of maxlong, and the
42              quantity maxlong-minlong must be less than or equal to 360.
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44       maxlong (PLFLT(3plplot), input)
45              The value of the longitude on the right side of the plot.
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47       minlat (PLFLT(3plplot), input)
48              The minimum latitude to be plotted on the  background.  One  can
49              always use -90.0 as the boundary outside the plot window will be
50              automatically eliminated.  However, the program will  be  faster
51              if one can reduce the size of the background plotted.
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53       maxlat (PLFLT(3plplot), input)
54              The  maximum  latitudes to be plotted on the background. One can
55              always use 90.0 as the boundary outside the plot window will  be
56              automatically eliminated.
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AUTHORS

60       Many  developers  (who  are  credited at http://plplot.org/credits.php)
61       have contributed to PLplot over its long history.
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SEE ALSO

64       PLplot documentation at http://plplot.org/documentation.php.
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68                                 August, 2021             PLMERIDIANS(3plplot)
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