plslabelfunc
( | label_func , |
label_data
); |
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, plbox, plbox3 and similar functions.
label_func
(PLLABEL_FUNC_callback
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:
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
This parameter may be used to pass data to the
label_func function.
This function is used in example 19.