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plslabelfunc(3plplot)


NAME

   plslabelfunc  -  Assign  a  function  to use for generating custom axis
   labels

SYNOPSIS

   plslabelfunc(label_func, label_data)

DESCRIPTION

   This function allows a user to provide their own  function  to  provide
   axis  label  text.   The user function is given the numeric value for a
   point on an axis and returns a string label  to  correspond  with  that
   value.   Custom  axis  labels  can  be  enabled  by passing appropriate
   arguments  to  plenv(3plplot),  plbox(3plplot),   plbox3(3plplot)   and
   similar functions.

   This function is used in example 19.

ARGUMENTS

   label_func (void (*) (PLINT, PLFLT, char *, PLINT, PLPointer), input)
          This  is  the  custom  label function.  In order to reset to the
          default labelling, set this  to  NULL.  The  labelling  function
          parameters  are,  in order: .TP axis This indicates which axis a
          label  is  being  requested  for.  The  value  will  be  one  of
          PL_X_AXIS, PL_Y_AXIS or PL_Z_AXIS.

   value  This is the value along the axis which is being labelled.

   label_text
          The string representation of the label value.

   length The maximum length in characters allowed for label_text.

   label_data (PLPointer, input)
          This  parameter  may  be  used  to  pass  data to the label_func
          function.

AUTHORS

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

SEE ALSO

   PLplot                         documentation                         at
   http://plplot.sourceforge.net/documentation.php.

                               May, 2016             PLSLABELFUNC(3plplot)



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