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#!/usr/bin/env ruby
#
# This sample code is a port of clutter/examples/canvas.c.
# It is licensed under the terms of the GNU Lesser General Public
# License, version 2.1 or (at your option) later.
#
# Copyright (C) 2012 Ruby-GNOME2 Project Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
require "clutter"
stage = Clutter::Stage.new
stage.title = "2D Clock"
stage.user_resizable = true
stage.background_color = Clutter::Color.get_static(:sky_blue_light)
stage.set_size(300, 300)
stage.show
canvas = Clutter::Canvas.new
canvas.set_size(300, 300)
actor = Clutter::Actor.new
actor.content = canvas
actor.set_content_scaling_filters(:trilinear, :linear)
stage.add_child(actor)
actor.add_constraint(Clutter::BindConstraint.new(stage, :size, 0))
idle_resize_id = nil
actor.signal_connect("allocation-changed") do |_actor, allocation, flags|
idle_resize_id ||= Clutter::Threads.add_timeout(1000) do
width, height = _actor.size
_actor.content.set_size(width.ceil, height.ceil)
idle_resize_id = nil
GLib::Source::REMOVE
end
end
stage.signal_connect("destroy") do
Clutter.main_quit
end
canvas.signal_connect("draw") do |_canvas, cairo_context, width, height|
now = Time.now
seconds = now.sec * Math::PI / 30
minutes = now.min * Math::PI / 30
hours = now.hour * Math::PI / 6
cairo_context.save do
cairo_context.operator = :clear
cairo_context.paint
end
cairo_context.operator = :over
cairo_context.scale(width, height)
cairo_context.line_cap = :round
cairo_context.line_width = 0.1
# the black rail that holds the seconds indicator
cairo_context.set_source_clutter_color(Clutter::Color.get_static(:black))
cairo_context.translate(0.5, 0.5)
cairo_context.arc(0, 0, 0.4, 0, Math::PI * 2)
cairo_context.stroke
# the seconds indicator
color = Clutter::Color.get_static(:white)
color.alpha = 128
cairo_context.set_source_clutter_color(color)
cairo_context.move_to(0, 0)
cairo_context.arc(Math.sin(seconds) * 0.4,
-Math.cos(seconds) * 0.4,
0.05,
0,
Math::PI * 2)
cairo_context.fill
# the minutes hand
color = Clutter::Color.get_static(:chameleon_dark)
color.alpha = 196
cairo_context.set_source_clutter_color(color)
cairo_context.move_to(0, 0)
cairo_context.line_to(Math.sin(minutes) * 0.4,
-Math.cos(minutes) * 0.4)
cairo_context.stroke
# the hours hand
cairo_context.move_to(0, 0)
cairo_context.line_to(Math.sin(hours) * 0.2,
-Math.cos(hours) * 0.2)
cairo_context.stroke
true
end
canvas.invalidate
Clutter::Threads.add_timeout(100, 1000) do
canvas.invalidate
GLib::Source::CONTINUE
end
Clutter.main
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