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Contents
module Vamp
module Graphic
# basis class for graphic implementations
# you have to implement :dot, :undot, :clear and :screen
class Dotter
attr_reader :width # number of dots in x direction
attr_reader :height # number of dots in y direction
def initialize(width, height)
@width = width
@height = height
clear
end
# put dot at x, ys
def dot(x, y)
check(x, y)
self
end
# is there a dot at x, y
def dot?(x, y)
check(x, y)
end
# remove dot at x, y
def undot(x, y)
check(x, y)
self
end
# clear screen of all dots
def clear
self
end
# return complete screen as string representation
def screen
end
# check if (x, y) is on the screen
def in?(x, y)
(0...width) === x && (0...height) === y
end
# check if (x, y) is on the screen, fails if not
def check(x, y)
fail "for (#{x}, #{y}}: x not in [0, #{width}[" unless (0...width) === x
fail "for (#{x}, #{y}}: y not in [0, #{height}[" unless (0...height) === y
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems