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#--
# $Id: stylable.rb,v 1.7 2009/02/28 23:52:28 rmagick Exp $
# Copyright (C) 2009 Timothy P. Hunter
#++
module Magick
class RVG
# :stopdoc:
STYLES = %i[
clip_path clip_rule fill fill_opacity fill_rule font
font_family font_size font_stretch font_style font_weight
opacity stroke stroke_dasharray stroke_dashoffset stroke_linecap
stroke_linejoin stroke_miterlimit stroke_opacity stroke_width
text_anchor text_decoration
glyph_orientation_vertical glyph_orientation_horizontal
letter_spacing word_spacing baseline_shift writing_mode
]
Styles = Struct.new(*STYLES)
# Styles is a Struct class with a couple of extra methods
class Styles
def set(styles)
begin
styles.each_pair do |style, value|
begin
self[style] = value
rescue NoMethodError
raise ArgumentError, "unknown style `#{style}'"
end
end
rescue NoMethodError
raise ArgumentError, "style arguments must be in the form `style => value'"
end
self
end
# Iterate over the style names. Yield for each style that has a value.
def each_value
each_pair do |style, value|
yield(style, value) if value
end
end
# The "usual" deep_copy method doesn't copy a Struct correctly.
def deep_copy(_h = nil)
copy = Styles.new
each_pair { |style, value| copy[style] = value }
copy
end
end # class Styles
# :startdoc:
# This module is mixed into classes that can have styles.
module Stylable
private
# For each style that has a value, add a style primitive to the gc.
# Use splat to splat out Array arguments such as stroke_dasharray.
def add_style_primitives(gc)
@styles.each_value do |style, value|
if value.respond_to? :add_primitives
value.add_primitives(gc, style)
else
gc.__send__(style, *value)
end
end
end
def initialize
super
@styles = Styles.new
end
public
# This method can be used with any RVG, Group, Use, Text, or
# shape object. The argument is a hash. The style names are
# the hash keys. The style names and values are:
# [:baseline_shift] modify the text baseline
# [:clip_path] clipping path defined by clip_path
# [:clip_rule] 'evenodd' or 'nozero'
# [:fill] color name
# [:fill_opacity] the fill opacity, 0.0<=N<=1.0
# [:fill_rule] 'evenodd' or 'nozero'
# [:font] font name or font file name
# [:font_family] font family name, ex. 'serif'
# [:font_size] font size in points
# [:font_stretch] 'normal','ultra_condensed','extra_condensed',
# 'condensed','semi_condensed','semi_expanded',
# 'expanded','extra_expanded','ultra_expanded'
# [:font_style] 'normal','italic','oblique'
# [:font_weight] 'normal','bold','bolder','lighter', or
# a multiple of 100 between 100 and 900.
# [:glyph_orientation_horizontal] 0, 90, 180, 270
# [:glyph_orientation_vertical] 0, 90, 180, 270
# [:letter_spacing] modify the spacing between letters
# [:opacity] both fill and stroke opacity, 0.0<=N<=1.0
# [:stroke] color name
# [:stroke_dasharray] dash pattern (Array)
# [:stroke_dashoffset] initial distance into dash pattern
# [:stroke_linecap] 'butt', 'round', 'square'
# [:stroke_linejoin] 'miter', 'round', 'bevel'
# [:stroke_miterlimit] miter length constraint
# [:stroke_opacity] the stroke opacity, 0.0<=N<=1.0
# [:stroke_width] stroke width
# [:text_anchor] 'start','middle','end'
# [:text_decoration] 'none','underline','overline','line_through'
# [:word_spacing] modify the spacing between words
# [:writing_mode] 'lr-tb', 'lr', 'rt-tb', 'rl', 'tb-rl', 'tb'
def styles(styles)
@styles.set(styles)
yield(self) if block_given?
self
end
end # module Stylable
end # class RVG
end # module Magick
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