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# encoding: utf-8
#
# Blend modes can be used to change the way two layers (images, graphics,
# text, etc.) are blended together. The <code>blend_mode</code> method
# accepts a single blend mode or an array of blend modes. PDF viewers should
# blend the layers based on the first recognized blend mode.
#
# Valid blend modes in v1.4 of the PDF spec include :Normal, :Multiply, :Screen,
# :Overlay, :Darken, :Lighten, :ColorDodge, :ColorBurn, :HardLight, :SoftLight,
# :Difference, :Exclusion, :Hue, :Saturation, :Color, and :Luminosity.
#
require File.expand_path(File.join(File.dirname(__FILE__),
%w[.. example_helper]))
filename = File.basename(__FILE__).gsub('.rb', '.pdf')
Prawn::ManualBuilder::Example.generate(filename) do
start_new_page
# https://commons.wikimedia.org/wiki/File:Blend_modes_2.-bottom-layer.jpg#/media/File:Blend_modes_2.-bottom-layer.jpg
bottom_layer = "#{Prawn::DATADIR}/images/blend_modes_bottom_layer.jpg"
# https://commons.wikimedia.org/wiki/File:Blend_modes_1.-top-layer.jpg#/media/File:Blend_modes_1.-top-layer.jpg
top_layer = "#{Prawn::DATADIR}/images/blend_modes_top_layer.jpg"
blend_modes = [:Normal, :Multiply, :Screen, :Overlay, :Darken, :Lighten, :ColorDodge, :ColorBurn, :HardLight, :SoftLight, :Difference, :Exclusion, :Hue, :Saturation, :Color, :Luminosity]
blend_modes.each_with_index do |blend_mode, index|
x = index % 4 * 135
y = cursor - (index / 4 * 200)
image bottom_layer, :at => [x, y], :fit => [125, 125]
blend_mode(blend_mode) do
image top_layer, :at => [x, y], :fit => [125, 125]
end
y -= 130
fill_color '009ddc'
fill_rectangle [x, y], 75, 25
blend_mode(blend_mode) do
fill_color 'fdb827'
fill_rectangle [x + 50, y], 75, 25
end
y -= 30
fill_color '000000'
text_box blend_mode.to_s, :at => [x, y]
end
end
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