From: "Simon Kröger" <SimonKroeger@...>
Date: 2005-10-12T06:48:51+09:00
Subject: unfinished [SOLUTION] Text Image (#50)

Hi,

i'm completely new to ncurses, so could someone with more exprerience 
(or another OS) try this and tell me whats happening?
On windows all the colors are very pale (are there consts for lighter
colors?)
-----------------------------------------------------------------------
require 'RMagick'
require "ncurses"

Ncurses.initscr
puts "Usage: #{$0} <img> [size]" or exit if !ARGV[0]
puts "Sorry, no colors!" or exit unless Ncurses.has_colors?

img, size = Magick::ImageList.new(ARGV[0]), (ARGV[1]||40).to_f
factor = [size*2/img.rows, size/img.columns].min
img.resize!(img.columns*factor, (img.rows*factor*0.5).round)

COLORS =
   [[Ncurses::COLOR_BLACK, [0, 0, 0]], [Ncurses::COLOR_RED, [1, 0, 0]],
   [Ncurses::COLOR_GREEN, [0, 1, 0]], [Ncurses::COLOR_BLUE, [0, 0, 1]],
   [Ncurses::COLOR_YELLOW, [1, 1, 0]], [Ncurses::COLOR_MAGENTA, [1, 0, 1]],
   [Ncurses::COLOR_CYAN, [0, 1, 1]], [Ncurses::COLOR_WHITE, [1, 1, 1]]]

GRADIENT = [[0, ' '], [50, ':'], [100, '|'], [150, 'I'], [200, '#']]
COLORMAP = {}

COLORS.size.times do |bg|
   COLORS.size.times do |fg|
     next if fg == bg
     i = (bg*COLORS.size) + fg
     Ncurses.init_pair(i, COLORS[fg][0], COLORS[bg][0])
     GRADIENT.each do |gr, c|
       r = COLORS[fg][1][0] * gr + COLORS[bg][1][0] * (255-gr)
       g = COLORS[fg][1][1] * gr + COLORS[bg][1][1] * (255-gr)
       b = COLORS[fg][1][2] * gr + COLORS[bg][1][2] * (255-gr)
       COLORMAP[[r, g, b]] = [i, c]
     end
   end
end

#(16*16*4).times do |i|
#  Ncurses.stdscr.attrset(Ncurses.COLOR_PAIR(i))
#  Ncurses.stdscr.mvaddstr(i/16, (i%16)*4, 'TEST')
#end
#Ncurses.refresh

pixels = img.get_pixels(0, 0, img.columns, img.rows)
img.rows.times do |y|
   img.columns.times do |x|
     p = pixels[y*img.columns + x]
     r, g, b, best, dist = p.red, p.green, p.blue, -1, 255
     COLORMAP.each do |k, v|
       d = Math.sqrt((r-k[0])**2 + (g-k[1])**2 + (b-k[2])**2)
       (best, dist = v, d) if d < dist
     end
     Ncurses.stdscr.attrset(Ncurses.COLOR_PAIR(best[0]))
     Ncurses.stdscr.mvaddstr(y, x, best[1])
   end
end

Ncurses.refresh
-----------------------------------------------------------------------

maybe someone can help..

cheers

Simon