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module Vedeu
# Converts a position into an index for the terminal. An index is the position
# minus 1.
#
class PositionIndex
# Convenience constructor for Vedeu::Position.
#
# @param (see #initialize)
def self.[](y, x)
new(y, x).[]
end
# Returns a new instance of Vedeu::PositionIndex.
#
# @param y [Fixnum] The row/line coordinate.
# @param x [Fixnum] The column/character coordinate.
# @return [Vedeu::PositionIndex]
def initialize(y, x)
@y = y
@x = x
end
# Returns a tuple containing the y and x coordinates.
#
# @return [Array<Fixnum>]
def []
[y, x]
end
# An object is equal when its values are the same.
#
# @param other [Vedeu::PositionIndex]
# @return [Boolean]
def eql?(other)
self.class == other.class && (x == other.x && y == other.y)
end
alias_method :==, :eql?
# Converts the index values into a Vedeu::Position.
#
# @return [Vedeu::Position]
def to_position
Vedeu::Position[y, x]
end
# Returns the x index.
# If the position for x is less than 1, then the index is 0.
#
# @return [Fixnum]
def x
@_x ||= ((@x - 1) <= 1) ? 0 : (@x - 1)
end
alias_method :last, :x
# Returns the y index.
# If the position for y is less than 1, then the index is 0.
#
# @return [Fixnum]
def y
@_y ||= ((@y - 1) <= 1) ? 0 : (@y - 1)
end
alias_method :first, :y
end # PositionIndex
end # Vedeu
Version data entries
8 entries across 8 versions & 1 rubygems