;+
; NAME:
; SHOWFONT
;
; PURPOSE:
; Uses current graphics device to draw a map of characters
; available in the font specified in argument
;
; CATEGORY:
; General
;
; CALLING SEQUENCE:
; showfont, num, 'title' ; table of font num entitled 'title'
;
; KEYWORD PARAMETERS:
; /encapsulated ; ignored (just for compatibility)
; /tt_font ; ignored (just for compatibility)
; base = 16 ; number of columns in the table
; beg = 32 ; first character
; fin = num eq 3 ? 255 : 127 ; last character
;
; OUTPUTS:
; None.
;
; OPTIONAL OUTPUTS:
; None.
;
; COMMON BLOCKS:
; None.
;
; SIDE EFFECTS:
; Draws a font table on the current graphic device.
;
; RESTRICTIONS:
; None.
;
; PROCEDURE:
;
; EXAMPLE:
; showfont, 9, 'GDL math symbols' ; show mappings for font 9
;
; MODIFICATION HISTORY:
; Written by: Sylwester Arabas (2008/12/28)
;-
; LICENCE:
; Copyright (C) 2008,
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;-
pro showfont, num, name, encapsulated=eps, tt_font=tt, base=base, beg=beg, fin=fin
; handling default keyword values
if not keyword_set(base) then base = 16
if not keyword_set(beg) then beg = 32
if not keyword_set(fin) then fin = num eq 3 ? 255 : 127
if not keyword_set(name) then name = ''
; constructing horizontal and vertical grid lines
n_hor = (fin + 1 - beg) / base + 1
h_x = (double(rebin(base * byte(128 * indgen(2 * (n_hor))) / 128, 4 * n_hor, /sample)))[1:4 * n_hor - 1] - .5
h_y = (double(rebin(beg + indgen(n_hor) * base, 4 * n_hor, /sample)))[0:4 * n_hor - 2] - base/2.
v_x = base - indgen(4 * base - 1) / 4 - .5
v_y = (double(rebin(byte(128 * indgen(2 * (base))) / 128, 4 * base, /sample)))[1:4 * base - 1] $
* base * ((fin + 1 - beg) / base) + beg - base / 2.
; ploting grid and title
plot, [h_x, v_x], [h_y, v_y], $
title='Font ' + strtrim(string(num), 2) + ', ' + name, $
xrange=[-1, base], $
yrange=[base * ((fin + 1) / base), beg - base], $
yticks=n_hor, $
xticks=base+1, $
xtitle='char mod ' + strtrim(string(base), 2), $
ytitle=strtrim(string(base), 2) + ' * (char / ' + strtrim(string(base), 2) + ')'
; ploting characters
for c = beg, fin do $
xyouts, (c mod base), base * (c / base), '!' + strtrim(string(num), 2) + string(byte(c))
end