NAME

       plmeridians - Plot latitude and longitude lines

SYNOPSIS

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

DESCRIPTION

       Displays latitude and longitude on the current plot.  The lines are plotted in the current
       color and line style.

       Redacted form: plmeridians(mapform, dlong, dlat, minlong, maxlong, minlat, maxlat)

       This function is used in example 19.

ARGUMENTS

       mapform (PLMAPFORM_callback(3plplot), input)
              A user supplied function to transform the coordinate longitudes and latitudes to  a
              plot  coordinate  system.  By using this transform, we can change from a longitude,
              latitude coordinate to a polar  stereographic  project,  for  example.   Initially,
              x[0]..[n-1]  are  the  longitudes and y[0]..y[n-1] are the corresponding latitudes.
              After the call to mapform(), x[] and y[] should be replaced  by  the  corresponding
              plot coordinates. If no transform is desired, mapform can be replaced by NULL.

       dlong (PLFLT(3plplot), input)
              The interval in degrees at which the longitude lines are to be plotted.

       dlat (PLFLT(3plplot), input)
              The interval in degrees at which the latitude lines are to be plotted.

       minlong (PLFLT(3plplot), input)
              The  value of the longitude on the left side of the plot. The value of minlong must
              be less than the value of maxlong, and the quantity maxlong-minlong  must  be  less
              than or equal to 360.

       maxlong (PLFLT(3plplot), input)
              The value of the longitude on the right side of the plot.

       minlat (PLFLT(3plplot), input)
              The  minimum  latitude to be plotted on the background. One can always use -90.0 as
              the boundary outside the plot window will be  automatically  eliminated.   However,
              the program will be faster if one can reduce the size of the background plotted.

       maxlat (PLFLT(3plplot), input)
              The  maximum  latitudes to be plotted on the background. One can always use 90.0 as
              the boundary outside the plot window will be automatically eliminated.

AUTHORS

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

SEE ALSO

       PLplot documentation at http://plplot.org/documentation.php.

                                           August, 2023                      PLMERIDIANS(3plplot)