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Contents
# 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 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 save_graphics_state
add_content "q"
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
add_content "Q"
end
end
end
end
Version data entries
3 entries across 3 versions & 2 rubygems