Module: Prawn::Graphics::Transparency
- Included in:
- Prawn::Graphics
- Defined in:
- lib/prawn/graphics/transparency.rb
Overview
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([x, y], 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([x, y], 25)
end
Instance Method Summary collapse
-
#transparent(opacity, stroke_opacity = opacity, &block) ⇒ Object
Sets the
opacity
andstroke_opacity
for all the content within theblock
Ifstroke_opacity
is not provided, then it takes on the same value asopacity
.
Instance Method Details
#transparent(opacity, stroke_opacity = opacity, &block) ⇒ Object
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([x, y], 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([x, y], 25)
end
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# File 'lib/prawn/graphics/transparency.rb', line 54 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 restore_graphics_state end |