class Magick::Geometry

def initialize(width=nil, height=nil, x=nil, y=nil, flag=nil)
    # Support floating-point width and height arguments so Geometry
    # objects can be used to specify Image#density= arguments.
    if width == nil
        @width = 0
    elsif width.to_f >= 0.0
        @width = width.to_f
    else
        Kernel.raise ArgumentError, "width must be >= 0: #{width}"
    end
    if height == nil
        @height = 0
    elsif height.to_f >= 0.0
        @height = height.to_f
    else
        Kernel.raise ArgumentError, "height must be >= 0: #{height}"
    end
    @x    = x.to_i
    @y    = y.to_i
    @flag = flag
end

def to_s
    str = ''
    str << sprintf("%d", @width+0.5) if @width > 0
    str << 'x' if (@width > 0 || @height > 0)
    str << sprintf("%d", @height+0.5) if @height > 0
    str << sprintf("%+d%+d", @x+0.5, @y+0.5) if (@x != 0 || @y != 0)
    str << FLAGS[@flag.to_i]
end