starting a new page
# File lib/pdf/reader/page_state.rb, line 22 def initialize(page) @page = page @objects = page.objects @font_stack = [build_fonts(page.fonts)] @xobject_stack = [page.xobjects] @cs_stack = [page.color_spaces] @stack = [DEFAULT_GRAPHICS_STATE.dup] end
Text Object Operators
# File lib/pdf/reader/page_state.rb, line 71 def begin_text_object @text_matrix = Matrix.identity(3) @text_line_matrix = Matrix.identity(3) end
update the current transformation matrix.
If the CTM is currently undefined, just store the new values.
If there's an existing CTM, then multiply the existing matrix with the new matrix to form the updated matrix.
# File lib/pdf/reader/page_state.rb, line 54 def concatenate_matrix(a, b, c, d, e, f) transform = Matrix[ [a, b, 0], [c, d, 0], [e, f, 1] ] if state[:ctm] state[:ctm] = transform * state[:ctm] else state[:ctm] = transform end end
transform x and y co-ordinates from the current user space to the underlying device space.
# File lib/pdf/reader/page_state.rb, line 198 def ctm_transform(x, y, z = 1) [ (ctm[0,0] * x) + (ctm[1,0] * y) + (ctm[2,0] * z), (ctm[0,1] * x) + (ctm[1,1] * y) + (ctm[2,1] * z) ] end
# File lib/pdf/reader/page_state.rb, line 216 def current_font find_font(state[:text_font]) end
# File lib/pdf/reader/page_state.rb, line 76 def end_text_object @text_matrix = Matrix.identity(3) @text_line_matrix = Matrix.identity(3) end
# File lib/pdf/reader/page_state.rb, line 227 def find_color_space(label) dict = @cs_stack.detect { |colorspaces| colorspaces.has_key?(label) } dict ? dict[label] : nil end
# File lib/pdf/reader/page_state.rb, line 220 def find_font(label) dict = @font_stack.detect { |fonts| fonts.has_key?(label) } dict ? dict[label] : nil end
# File lib/pdf/reader/page_state.rb, line 234 def find_xobject(label) dict = @xobject_stack.detect { |xobjects| xobjects.has_key?(label) } dict ? dict[label] : nil end
# File lib/pdf/reader/page_state.rb, line 98 def font_size state[:text_font_size] * @text_matrix[0,0] end
XObjects
# File lib/pdf/reader/page_state.rb, line 169 def invoke_xobject(label) save_graphics_state xobject = find_xobject(label) raise MalformedPDFError, "XObject #{label} not found" if xobject.nil? matrix = xobject.hash[:Matrix] concatenate_matrix(*matrix) if matrix if xobject.hash[:Subtype] == :Form form = PDF::Reader::FormXObject.new(@page, xobject) @font_stack.unshift(form.font_objects) @xobject_stack.unshift(form.xobjects) yield form if block_given? @font_stack.shift @xobject_stack.shift else yield xobject if block_given? end restore_graphics_state end
Text Positioning Operators
# File lib/pdf/reader/page_state.rb, line 122 def move_text_position(x, y) # Td temp_matrix = Matrix[ [1, 0, 0], [0, 1, 0], [x, y, 1] ] @text_matrix = @text_line_matrix = temp_matrix * @text_line_matrix end
# File lib/pdf/reader/page_state.rb, line 131 def move_text_position_and_set_leading(x, y) # TD set_text_leading(-1 * y) move_text_position(x, y) end
# File lib/pdf/reader/page_state.rb, line 156 def move_to_next_line_and_show_text(str) # ' move_to_start_of_next_line end
# File lib/pdf/reader/page_state.rb, line 144 def move_to_start_of_next_line # T* move_text_position(0, -state[:text_leading]) end
# File lib/pdf/reader/page_state.rb, line 39 def restore_graphics_state @stack.pop end
Graphics State Operators
# File lib/pdf/reader/page_state.rb, line 35 def save_graphics_state @stack.push clone_state end
Text State Operators
# File lib/pdf/reader/page_state.rb, line 85 def set_character_spacing(char_spacing) state[:char_spacing] = char_spacing end
# File lib/pdf/reader/page_state.rb, line 89 def set_horizontal_text_scaling(h_scaling) state[:h_scaling] = h_scaling end
# File lib/pdf/reader/page_state.rb, line 160 def set_spacing_next_line_show_text(aw, ac, string) # " set_word_spacing(aw) set_character_spacing(ac) move_to_next_line_and_show_text(string) end
# File lib/pdf/reader/page_state.rb, line 93 def set_text_font_and_size(label, size) state[:text_font] = label state[:text_font_size] = size end
# File lib/pdf/reader/page_state.rb, line 102 def set_text_leading(leading) state[:text_leading] = leading end
# File lib/pdf/reader/page_state.rb, line 136 def set_text_matrix_and_text_line_matrix(a, b, c, d, e, f) # Tm @text_matrix = @text_line_matrix = Matrix[ [a, b, 0], [c, d, 0], [e, f, 1] ] end
# File lib/pdf/reader/page_state.rb, line 106 def set_text_rendering_mode(mode) state[:text_mode] = mode end
# File lib/pdf/reader/page_state.rb, line 110 def set_text_rise(rise) state[:text_rise] = rise end
# File lib/pdf/reader/page_state.rb, line 114 def set_word_spacing(word_spacing) state[:word_spacing] = word_spacing end
Text Showing Operators
# File lib/pdf/reader/page_state.rb, line 152 def show_text_with_positioning(params) # TJ # TODO record position changes in state here end
transform x and y co-ordinates from the current text space to the underlying device space.
# File lib/pdf/reader/page_state.rb, line 208 def trm_transform(x, y, z = 1) trm = text_rendering_matrix [ (trm[0,0] * x) + (trm[1,0] * y) + (trm[2,0] * z), (trm[0,1] * x) + (trm[1,1] * y) + (trm[2,1] * z) ] end