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#!/usr/bin/ruby
########################################################################
# oo-board.rb - draw a checkerboard (object-oriented version) #
# (c) 2002 Paul Duncan <pabs@pablotron.org> #
# #
# - test Imlib2::Image#fill_rect, Imlib2::Image#save, and color #
# constants (Imlib2::Color::BLACK, Imlib2::Color::WHITE, etc) #
########################################################################
# load imlib2 bindings
require "imlib2"
class CheckerBoard
attr_accessor :w, :h, :bw, :bh, :fg, :bg, :tc, :bc
def initialize(*args)
# number, width, and height of boxes
@w, @h, @bw, @bh = args
# foreground, background, top piece, and bottom piece colors
@fg, @bg = Imlib2::Color::WHITE, Imlib2::Color::BLACK
@tc, @bc = Imlib2::Color::RED, Imlib2::Color::BLUE
# allocate the new image and fill it with the background color
@im = Imlib2::Image.new @w * @bw, @h * @bh
@im.fill_rect [0, 0], [@w * @bw, @h * @bh], @bg
end
# fill squares with foreground color
def draw_squares()
0.upto(@w / 2) { |x|
0.upto(@h / 2) { |y|
(0..1).each { |i|
rect = [x * @bw * 2 + @bw * i, y * @bh * 2 + @bh * i, @bw, @bh]
@im.fill_rect rect, @fg
}
}
}
end
# draw checker pieces
def draw_pieces()
0.upto(@w - 1) { |x|
0.upto(2) { |y|
# draw top piece
rect = [x * @bw + @bw / 2, y * @bh + @bh / 2, @bw * 0.4, @bh * 0.4]
# Imlib2 bug (works w/ draw_ellipse, but not w/ fill_ellipse)
@im.fill_ellipse rect, @tc if (x - (y % 2)) % 2 == 1
# draw bottom piece
rect[1] = h * @bh - rect[1]
# Imlib2 bug (works w/ draw_ellipse, but not w/ fill_ellipse)
@im.fill_ellipse rect, @bc if (x - (y % 2)) % 2 == 0
}
}
end
# save image
def save(filename)
@im.save filename
end
end
# if this file is the executable, then test out our member functions by
# creating a CheckerBoard instance and saving it as 'checkerboard.png'
# (unless a filename was passed on the command line)
if $0 == __FILE__
# set output filename (use argument if specified)
filename = "checkerboard.png"
filename = ARGV.pop if ARGV.length > 0
board = CheckerBoard.new 10, 10, 48, 48
puts "Generating checkerboard..."
board.draw_squares
puts "Generating pieces..."
board.draw_pieces
# save image (with error checking)
puts "Saving image to \"#{filename}\"..."
begin
board.save filename
rescue Imlib2::FileError
$stderr.puts "Couldn't save \"#{filename}\": " + $!
end
puts "Done."
end
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