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Contents
# Copyright (c) 2015-2016 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
=begin
= Pango/Text Mask
This demo shows how to use PangoCairo to draw text with more than
just a single color.
=end
class TextmaskDemo
def initialize(_main_window)
@window = Gtk::Window.new(:toplevel)
@window.resizable = true
@window.set_size_request(400, 200)
@window.title = "Text Mask"
da = Gtk::DrawingArea.new
@window.add(da)
da.signal_connect "draw" do |_widget, cr|
cr.save
layout = da.create_pango_layout("Pango power!\nPango power!\nPango power!")
desc = Pango::FontDescription.new("sans bold 34")
layout.font_description = desc
cr.move_to(30, 20)
cr.pango_layout_path(layout)
pattern = Cairo::LinearPattern.new(0.0, 0.0,
da.allocated_width,
da.allocated_height)
pattern.add_color_stop(0.0, 1.0, 0.0, 0.0)
pattern.add_color_stop(0.2, 1.0, 0.0, 0.0)
pattern.add_color_stop(0.3, 1.0, 1.0, 0.0)
pattern.add_color_stop(0.4, 0.0, 1.0, 0.0)
pattern.add_color_stop(0.6, 0.0, 1.0, 1.0)
pattern.add_color_stop(0.7, 0.0, 0.0, 1.0)
pattern.add_color_stop(0.8, 1.0, 0.0, 1.0)
pattern.add_color_stop(1.0, 1.0, 0.0, 1.0)
cr.set_source(pattern)
cr.fill_preserve
cr.set_source_rgb(0.0, 0.0, 0.0)
cr.set_line_width(0.5)
cr.stroke
cr.restore
true
end
end
def run
if !@window.visible?
@window.show_all
else
@window.destroy
end
@window
end
end
Version data entries
122 entries across 114 versions & 2 rubygems