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dd_function_filter(display) Display dd_function_filter(display)

NAME

dd_function_filter - a display_data filter which computes simple functions of points, vectors, scalars, and/or normals by delegating the actual computation to a function object.

DESCRIPTION

The dd_function_filter relieves the filter programmer from much of the tedium involved with writing simple display_data filters. Sometimes the operation that a filter performs is relatively simple, and involves merely computing new points, scalars, normals, vectors, and/or texture_coords from existing ones. Rather than going through the overhead of writing a generate_data method for a filter, which involves getting the source data, mallocing storage, updating the data out, and freeing storage, the dd_function_filter will do all of that for you, and compute your data_out using a function object (subclass of generic_function) that you supply by name.

SUPERCLASS

display_filter

INSTANCE VARIABLES

function The name of an instance of a subclass of generic_function which computes the function of interest on the data_in.

MESSAGES

function[?=] Standard string set and get messages.

generate_data! Generate data_out from data_in using named function object.

EXAMPLE

See man page for dipole_potential for an example of using this object.