proposp [WP]: set legend font size in plots

src/ts/croposp/croposplot.py

@@ -59,6 +59,7 @@ def usage():
   print(__version__)
   print('Usage: '+sys.argv[0]+' [-v]')
   print('       [-o file] [-g|--grid] [--nologlog] [--nologx] [--nology]')
+  print('       [--lfontsize s]')
   print('       file [file [file ...]]')
   print('   or: '+sys.argv[0]+' --help|-h')
 
@@ -82,6 +83,7 @@ def help():
   --nologlog      plot on linear scales
   --nologx        use linear scale for x-axis
   --nology        use linear scale for y-axis
+  --lfontsize s   set font size for legend
   """)
 
 # ============================================================================
@@ -96,7 +98,7 @@ def main(argv=None):
 
   try:
     opts, args=getopt.getopt(sys.argv[1:], 'hvo:g', ['help', 'nologlog',
-    'nologx', 'nology', 'grid', 'xlabel'])
+    'nologx', 'nology', 'grid', 'xlabel', 'lfontsize'])
   except getopt.GetoptError as err:
     print(err.msg)
     exit(0)
@@ -110,6 +112,7 @@ def main(argv=None):
   nology = False
   grid = False
   xlabel = 'frequency / Hz'
+  opt_legendfontsize='xx-small'
 
   for (opt, arg) in opts:
     if opt == '-v':
@@ -120,6 +123,8 @@ def main(argv=None):
       outfile=arg
     elif opt in ('--xlabel'):
       xlabel=arg
+    elif opt in ('--lfontsize'):
+      opt_legendfontsize=arg
     elif opt in ("-g", "--grid"):
       grid = True
     elif opt in ("--nologlog"):
@@ -184,7 +189,7 @@ def main(argv=None):
       if verbose:
         print('plot curve %d: %s' % (i, label))
       plt.plot(data[:,0], data[:,i], label=label)
-      plt.legend()
+      plt.legend(fontsize=opt_legendfontsize)
 
   if outfile=='x11':
     plt.show(True)