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module Vedeu
# Converts an index into a position for the terminal.
#
# When the optional offset `oy` and `ox` params are given, the they are used
# for the starting position.
#
# @api private
class IndexPosition
# @param (see #initialize)
# @return [Vedeu::Position]
def self.[](iy, ix, oy = 1, ox = 1)
new(iy, ix, oy, ox).[]
end
# Returns a new instance of Vedeu::IndexPosition.
#
# @param iy [Fixnum]
# @param ix [Fixnum]
# @param oy [Fixnum]
# @param ox [Fixnum]
# @return [Vedeu::IndexPosition]
def initialize(iy, ix, oy = 1, ox = 1)
@iy = iy
@ix = ix
@oy = oy
@ox = ox
end
# @return [Vedeu::Position]
def []
Vedeu::Position[y, x]
end
alias_method :to_position, :[]
# An object is equal when its values are the same.
#
# @param other [Vedeu::IndexPosition]
# @return [Boolean]
def eql?(other)
self.class == other.class && (x == other.x && y == other.y)
end
alias_method :==, :eql?
# Returns the y coordinate.
#
# @return [Fixnum]
def y
(iy <= 0) ? oy : (iy + oy)
end
alias_method :first, :y
# Returns the x coordinate.
#
# @return [Fixnum]
def x
(ix <= 0) ? ox : (ix + ox)
end
alias_method :last, :x
private
# @return [Fixnum]
def iy
@_iy ||= (@iy <= 0) ? 0 : @iy
end
# @return [Fixnum]
def ix
@_ix ||= (@ix <= 0) ? 0 : @ix
end
# @return [Fixnum]
def oy
@_oy ||= (@oy <= 1) ? 1 : @oy
end
# @return [Fixnum]
def ox
@_ox ||= (@ox <= 1) ? 1 : @ox
end
end # IndexPosition
end # Vedeu
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10 entries across 10 versions & 1 rubygems