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#!/usr/bin/env ruby
top = File.expand_path(File.join(File.dirname(__FILE__), ".."))
$LOAD_PATH.unshift File.join(top, "ext", "cairo")
$LOAD_PATH.unshift File.join(top, "lib")
require 'cairo'
require 'pango'
def render_background(cr)
cr.set_source_color(:white)
cr.paint
end
def make_layout(cr, text)
layout = cr.create_pango_layout
layout.text = text
layout.font_description = Pango::FontDescription.new("Serif 36")
cr.update_pango_layout(layout)
layout
end
def render(surface)
text = "It was a dream... Oh Just a dream..."
cr = Cairo::Context.new(surface)
render_background(cr)
cr.set_source_color(:red)
cr.move_to(25, 350)
cr.line_to(150, 375)
cr.curve_to(275, 400, 450, 350, 450, 200)
cr.curve_to(450, 0, 300, 150, 50, 50)
cr.stroke_preserve
path = cr.copy_path_flat
cr.line_width = 1
cr.new_path
layout = make_layout(cr, text)
cr.pango_layout_line_path(layout.get_line(0))
cr.map_path_onto(path)
cr.set_source_rgba(0.3, 0.3, 1.0, 0.3)
cr.fill_preserve
cr.set_source_rgba(0.1, 0.1, 0.1)
cr.stroke
cr.show_page
end
def output
Cairo::ImageSurface.new(500, 500) do |surface|
render(surface)
surface.write_to_png("text-on-path.png")
end
end
output
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