The Prawn::Transparency module is used to place transparent content on the page. It has the capacity for separate transparency values for stroked content and all other content.
Example:
# both the fill and stroke will be at 50% opacity pdf.transparent(0.5) do pdf.text("hello world") pdf.fill_and_stroke_circle_at([x, y], :radius => 25) end # the fill will be at 50% opacity, but the stroke will # be at 75% opacity pdf.transparent(0.5, 0.75) do pdf.text("hello world") pdf.fill_and_stroke_circle_at([x, y], :radius => 25) end
Sets the opacity and stroke_opacity for all the content within the block If stroke_opacity is not provided, then it takes on the same value as opacity
Valid ranges for both paramters are 0.0 to 1.0
Example:
# both the fill and stroke will be at 50% opacity pdf.transparent(0.5) do pdf.text("hello world") pdf.fill_and_stroke_circle_at([x, y], :radius => 25) end # the fill will be at 50% opacity, but the stroke will # be at 75% opacity pdf.transparent(0.5, 0.75) do pdf.text("hello world") pdf.fill_and_stroke_circle_at([x, y], :radius => 25) end
# File lib/prawn/graphics/transparency.rb, line 53 def transparent(opacity, stroke_opacity=opacity, &block) min_version(1.4) opacity = [[opacity, 0.0].max, 1.0].min stroke_opacity = [[stroke_opacity, 0.0].max, 1.0].min save_graphics_state add_content "/#{opacity_dictionary_name(opacity, stroke_opacity)} gs" yield if block_given? restore_graphics_state end
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