Sets or returns the fill color.
When called with no argument, it returns the current fill color.
If a single argument is provided, it should be a 6 digit HTML color code.
pdf.fill_color "f0ffc1"
If 4 arguments are provided, the color is assumed to be a CMYK value Values range from 0 - 100.
pdf.fill_color 0, 99, 95, 0
# File lib/prawn/graphics/color.rb, line 26 def fill_color(*color) return current_fill_color if color.empty? self.current_fill_color = process_color(*color) set_fill_color end
Converts hex string into RGB value array:
>> Prawn::Graphics::Color.hex2rgb("ff7808") => [255, 120, 8]
# File lib/prawn/graphics/color.rb, line 74 def hex2rgb(hex) r,g,b = hex[0..1], hex[2..3], hex[4..5] [r,g,b].map { |e| e.to_i(16) } end
Converts RGB value array to hex string suitable for use with #fill_color and #stroke_color
>> Prawn::Graphics::Color.rgb2hex([255,120,8]) => "ff7808"
# File lib/prawn/graphics/color.rb, line 65 def rgb2hex(rgb) rgb.map { |e| "%02x" % e }.join end
Sets or returns the line stroking color.
When called with no argument, it returns the current stroking color.
If a single argument is provided, it should be a 6 digit HTML color code.
pdf.stroke_color "f0ffc1"
If 4 arguments are provided, the color is assumed to be a CMYK value Values range from 0 - 100.
pdf.stroke_color 0, 99, 95, 0
# File lib/prawn/graphics/color.rb, line 48 def stroke_color(*color) return current_stroke_color if color.empty? color = process_color(*color) self.current_stroke_color = color set_stroke_color(color) end
# File lib/prawn/graphics/color.rb, line 123 def color_space(color) case color_type(color) when :RGB :DeviceRGB when :CMYK :DeviceCMYK end end
# File lib/prawn/graphics/color.rb, line 119 def color_to_s(color) normalize_color(color).map { |c| '%.3f' % c }.join(' ') end
# File lib/prawn/graphics/color.rb, line 92 def color_type(color) case color when String :RGB when Array case color.length when 3 :RGB when 4 :CMYK else raise ArgumentError, "Unknown type of color: #{color.inspect}" end end end
# File lib/prawn/graphics/color.rb, line 190 def current_color_space(type) graphic_state.color_space[type] end
# File lib/prawn/graphics/color.rb, line 199 def current_fill_color graphic_state.fill_color end
# File lib/prawn/graphics/color.rb, line 203 def current_fill_color=(color) graphic_state.fill_color = color end
# File lib/prawn/graphics/color.rb, line 207 def current_stroke_color graphic_state.stroke_color end
# File lib/prawn/graphics/color.rb, line 211 def current_stroke_color=(color) graphic_state.stroke_color = color end
# File lib/prawn/graphics/color.rb, line 108 def normalize_color(color) case color_type(color) when :RGB r,g,b = hex2rgb(color) [r / 255.0, g / 255.0, b / 255.0] when :CMYK c,m,y,k = *color [c / 100.0, m / 100.0, y / 100.0, k / 100.0] end end
# File lib/prawn/graphics/color.rb, line 81 def process_color(*color) case(color.size) when 1 color[0] when 4 color else raise ArgumentError, 'wrong number of arguments supplied' end end
# File lib/prawn/graphics/color.rb, line 155 def set_color(type, color, options = {}) operator = case type when :fill 'scn' when :stroke 'SCN' else raise ArgumentError, "unknown type '#{type}'" end if options[:pattern] set_color_space type, :Pattern add_content "/#{color} #{operator}" else set_color_space type, color_space(color) color = color_to_s(color) write_color(color, operator) end end
# File lib/prawn/graphics/color.rb, line 134 def set_color_space(type, color_space) # don't set the same color space again return if current_color_space(type) == color_space && !state.page.in_stamp_stream? set_current_color_space(color_space, type) unless COLOR_SPACES.include?(color_space) raise ArgumentError, "unknown color space: '#{color_space}'" end operator = case type when :fill 'cs' when :stroke 'CS' else raise ArgumentError, "unknown type '#{type}'" end add_content "/#{color_space} #{operator}" end
# File lib/prawn/graphics/color.rb, line 194 def set_current_color_space(color_space, type) save_graphics_state if graphic_state.nil? graphic_state.color_space[type] = color_space end
# File lib/prawn/graphics/color.rb, line 175 def set_fill_color(color = nil) set_color :fill, color || current_fill_color end
# File lib/prawn/graphics/color.rb, line 179 def set_stroke_color(color = nil) set_color :stroke, color || current_stroke_color end
# File lib/prawn/graphics/color.rb, line 183 def update_colors set_fill_color set_stroke_color end
# File lib/prawn/graphics/color.rb, line 223 def write_color(color, operator) add_content "#{color} #{operator}" end
# File lib/prawn/graphics/color.rb, line 215 def write_fill_color write_color(current_fill_color, 'scn') end
# File lib/prawn/graphics/color.rb, line 219 def write_stroke_color write_color(current_fill_color, 'SCN') end