/*! \page displaylib GRASS Display Library

by GRASS Development Team (https://grass.osgeo.org)

This library provides a wide assortment of higher level graphics
commands which in turn use the graphics library primitives. It is
highly recommended that this section be used to understand how some of
the GRASS graphics commands operate. Such modules like
<tt>d.vect</tt>, <tt>d.graph</tt>, and <tt>d.rast</tt> demonstrate how
these routines work together.

The routines fall into four basic sets:
-# frame creation and management;
-# coordinate conversion routines;
-# specialized efficient raster display routines, and;
-# assorted miscellaneous routines like pop-up menus and line clipping.

Note: All routines and global variables in this library, documented or
undocumented, start with <em>D_</em> prefix. To avoid name
conflicts, programmers should not create variables or routines in
their own modules which use this prefix.

\section displayLibFns List of functions

The library functions are defined in <tt>display.h</tt> header:

\code
#include <grass/display.h>
\endcode

- D_a_to_d_col()

- D_a_to_d_row()

- D_a_to_u_col()

- D_a_to_u_row()

- D_begin()

- D_box_abs()

- D_box_rel()

- D_c_color()

- D_cell_draw_begin()

- D_cell_draw_end()

- D_clip_to_map()

- D_close()

- D_close_driver()

- D_color()

- D_color_number_to_RGB()

- D_color_of_type()

- D_cont_abs()

- D_cont_rel()

- D_d_color()

- D_do_conversions()

- D_dots()

- D_draw_cell()

- D_draw_c_raster()

- D_draw_d_raster()

- D_draw_f_raster()

- D_draw_raster()

- D_draw_raster_RGB()

- D_d_to_a_col()

- D_d_to_a_row()

- D_d_to_u_col()

- D_d_to_u_row()

- D_encoding()

- D_end()

- D_erase()

- D__erase()

- D_f_color()

- D_fill()

- D_fit_d_to_u()

- D_fit_u_to_d()

- D_font()

- D_font_info()

- D_font_list()

- D_get_a()

- D_get_a_east()

- D_get_a_north()

- D_get_a_south()

- D_get_a_to_d_xconv()

- D_get_a_to_d_yconv()

- D_get_a_to_u_xconv()

- D_get_a_to_u_yconv()

- D_get_a_west()

- D_get_d()

- D_get_d_east()

- D_get_d_north()

- D_get_d_south()

- D_get_dst()

- D_get_d_to_a_xconv()

- D_get_d_to_a_yconv()

- D_get_d_to_u_xconv()

- D_get_d_to_u_yconv()

- D_get_d_west()

- D_get_ew_resolution()

- D_get_grid()

- D_get_ns_resolution()

- D_get_src()

- D_get_text_box()

- D_get_u()

- D_get_u_east()

- D_get_u_north()

- D_get_u_south()

- D_get_u_to_a_xconv()

- D_get_u_to_a_yconv()

- D_get_u_to_d_xconv()

- D_get_u_to_d_yconv()

- D_get_u_west()

- D_get_window()

- D_is_lat_lon()

- D_line_abs()

- D_line_rel()

- D_line_width()

- D_move_abs()

- D_move_rel()

- D_open_driver()

- D_parse_color()

- D_plot_icon()

- D_polydots_abs()

- D_polydots_rel()

- D_polygon_abs()

- D_polygon_rel()

- D_polyline_abs()

- D_polyline_rel()

- D_pos_abs()

- D_pos_rel()

- D_RGB_color()

- D_save_command()

- D_set_clip()

- D_set_clip_mode()

- D_set_dst()

- D_set_grid()

- D_set_overlay_mode()

- D_set_reduction()

- D_set_region()

- D_set_src()

- D_setup()

- D_setup2()

- D_setup_unity()

- D_show_conversions()

- D_stroke()

- D_symbol()

- D_symbol2()

- D_text()

- D_text_rotation()

- D_text_size()

- D_translate_color()

- D_update_conversions()

- D_use_color()

- D_u_to_a_col()

- D_u_to_a_row()

- D_u_to_d_col()

- D_u_to_d_row()

\section Authors Authors

- Original author CERL
- Major rewrite by Glynn Clements (2008)
- Minor updates by Martin Landa <landa.martin gmail.com> (2011)

*/