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#--
# $Id: pathdata.rb,v 1.5 2009/02/28 23:52:28 rmagick Exp $
# Copyright (C) 2009 Timothy P. Hunter
#++
module Magick
class RVG
# The PathData class provides an object-oriented way to produce an SVG
# path. Each of the methods corresponds to a path command. Construct a
# path by calling one or more methods. The path object can be passed
# as an argument to the RVG::ShapeConstructors#path method.
class PathData
private
def add_points(req, *coords)
return unless coords
raise ArgumentError, "wrong number of coordinates specified. A multiple of #{req} required, #{req + coords.length} given." if coords.length % req != 0
coords.each { |c| @path << sprintf('%g', c) }
end
public
# Construct an empty path
def initialize
@path = ''
end
# Convert the path to its string equivalent.
def to_s
@path
end
# @private
def deep_copy(_h = nil)
@path.dup
end
# Add a <tt>moveto</tt> command. If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def moveto(abs, x, y, *coords)
@path << sprintf('%s%g,%g ', (abs ? 'M' : 'm'), x, y)
# "subsequent pairs are treated as implicit lineto commands"
add_points(2, *coords)
end
# Add a <tt>closepath</tt> command. The <tt>abs</tt> argument
# is ignored.
def closepath(_abs = true)
@path << 'Z' # ignore `abs'
end
# Add a <tt>lineto</tt> command. Any number of x,y coordinate
# pairs may be specified. If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def lineto(abs, x, y, *coords)
@path << sprintf('%s%g,%g ', (abs ? 'L' : 'l'), x, y)
# "a number of coordinate pairs may be specified to draw a polyline"
add_points(2, *coords)
end
# Add a <tt>horizontal lineto</tt> command. If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def hlineto(abs, x)
@path << sprintf('%s%g ', (abs ? 'H' : 'h'), x)
end
# Add a <tt>vertical lineto</tt> command. If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def vlineto(abs, y)
@path << sprintf('%s%g ', (abs ? 'V' : 'v'), y)
end
# Add a <tt>curveto</tt> (<em>cubic Bezier</em>) command.
# If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def curveto(abs, x1, y1, x2, y2, x, y, *coords)
@path << sprintf('%s%g,%g %g,%g %g,%g ', (abs ? 'C' : 'c'), x1, y1, x2, y2, x, y)
# "multiple sets of coordinates may be specified to draw a polybezier"
add_points(6, *coords)
end
# Add a <tt>smooth curveto</tt> (<em>cubic Bezier</em>) command.
# If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def smooth_curveto(abs, x2, y2, x, y, *coords)
@path << sprintf('%s%g,%g %g,%g ', (abs ? 'S' : 's'), x2, y2, x, y)
# "multiple sets of coordinates may be specified to draw a polybezier"
add_points(4, *coords)
end
# Add a <tt>quadratic Bezier curveto</tt> command.
# If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def quadratic_curveto(abs, x1, y1, x, y, *coords)
@path << sprintf('%s%g,%g %g,%g ', (abs ? 'Q' : 'q'), x1, y1, x, y)
add_points(4, *coords)
end
# Add a <tt>smooth quadratic Bezier curveto</tt> command.
# If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def smooth_quadratic_curveto(abs, x, y, *coords)
@path << sprintf('%s%g,%g ', (abs ? 'T' : 't'), x, y)
add_points(2, *coords)
end
# Add an <tt>arc</tt> command.
# If <tt>abs</tt> is
# <tt>true</tt> the coordinates are absolute, otherwise
# the coordinates are relative.
def arc(abs, rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y)
@path << sprintf('%s%g,%g %g %d %d %g,%g ', (abs ? 'A' : 'a'), rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y)
end
end # class PathData
end # class RVG
end # module Magick
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