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# encoding: utf-8
#
# graphics_state.rb: Implements graphics state saving and restoring
#
# Copyright January 2010, Michael Witrant. All Rights Reserved.
#
# This is free software. Please see the LICENSE and COPYING files for details.
#
module Prawn
class GraphicStateStack
attr_accessor :stack
def initialize(previous_state = nil)
self.stack = [GraphicState.new(previous_state)]
end
def save_graphic_state(graphic_state = nil)
stack.push(GraphicState.new(graphic_state || current_state))
end
def restore_graphic_state
if stack.empty?
raise Prawn::Errors::EmptyGraphicStateStack,
"\n You have reached the end of the graphic state stack"
end
stack.pop
end
def current_state
stack.last
end
def present?
stack.size > 0
end
def empty?
stack.empty?
end
end
class GraphicState
attr_accessor :color_space, :dash, :cap_style, :join_style, :line_width, :fill_color, :stroke_color
def initialize(previous_state = nil)
@color_space = previous_state ? previous_state.color_space.dup : {}
@fill_color = previous_state ? previous_state.fill_color : "000000"
@stroke_color = previous_state ? previous_state.stroke_color : "000000"
@dash = previous_state ? previous_state.dash : { :dash => nil, :space => nil, :phase => 0 }
@cap_style = previous_state ? previous_state.cap_style : :butt
@join_style = previous_state ? previous_state.join_style : :miter
@line_width = previous_state ? previous_state.line_width : 1
end
def dash_setting
"[#{@dash[:dash]} #{@dash[:space]}] #{@dash[:phase]} d"
end
end
module Core
class Page
module GraphicsState
def graphic_state
stack.current_state
end
end
end
end
class Document
module GraphicsState
# Pushes the current graphics state on to the graphics state stack so we
# can restore it when finished with a change we want to isolate (such as
# modifying the transformation matrix). Used in pairs with
# restore_graphics_state or passed a block
#
# Example without a block:
#
# save_graphics_state
# rotate 30
# text "rotated text"
# restore_graphics_state
#
# Example with a block:
#
# save_graphics_state do
# rotate 30
# text "rotated text"
# end
#
def open_graphics_state
add_content "q"
end
def close_graphics_state
add_content "Q"
end
def save_graphics_state(graphic_state = nil)
graphic_stack.save_graphic_state(graphic_state)
open_graphics_state
if block_given?
yield
restore_graphics_state
end
end
# Pops the last saved graphics state off the graphics state stack and
# restores the state to those values
def restore_graphics_state
if graphic_stack.empty?
raise Prawn::Errors::EmptyGraphicStateStack,
"\n You have reached the end of the graphic state stack"
end
close_graphics_state
graphic_stack.restore_graphic_state
end
def graphic_stack
state.page.stack
end
def graphic_state
save_graphics_state unless graphic_stack.current_state
graphic_stack.current_state
end
end
end
end
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