From 9ea16d82cfe42c332ea90d4af802e3883ed12400 Mon Sep 17 00:00:00 2001
From: Antonio Ospite <ospite@studenti.unina.it>
Date: Wed, 6 Mar 2013 15:57:30 +0100
Subject: [PATCH 1/1] Initial import

---
 DOCS.txt               |   5 +++
 cairo-gtk-animation.py | 116 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 121 insertions(+)
 create mode 100644 DOCS.txt
 create mode 100755 cairo-gtk-animation.py

diff --git a/DOCS.txt b/DOCS.txt
new file mode 100644
index 0000000..f81393b
--- /dev/null
+++ b/DOCS.txt
@@ -0,0 +1,5 @@
+Cairo documentation:
+http://www.cairographics.org/
+
+Gtk+ documentation:
+https://developer.gnome.org/gtk3/
diff --git a/cairo-gtk-animation.py b/cairo-gtk-animation.py
new file mode 100755
index 0000000..36db3ef
--- /dev/null
+++ b/cairo-gtk-animation.py
@@ -0,0 +1,116 @@
+#!/usr/bin/env python
+
+# An example of an animation done with cairo and Gtk+
+#
+# Copyright (C) 2013  Antonio Ospite <ospite@studenti.unina.it>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# References:
+# http://wiki.laptop.org/go/PyGTK/Smooth_Animation_with_PyGTK
+
+import gi
+
+gi.require_version('Gtk', '3.0')
+from gi.repository import Gtk, GObject, Gio
+
+import math
+import colorsys
+
+
+class AnimatedCanvas(Gtk.DrawingArea):
+    def __init__(self,  width, height, *args, **kwargs):
+        super(AnimatedCanvas, self).__init__(*args, **kwargs)
+
+        self.width = width
+        self.height = height
+
+        self.x_offset = 2
+        self.y_offset = 3
+        self.radius = 10
+        self.border = 4
+
+        self.x = self.radius + self.border
+        self.y = self.radius + self.border
+
+        self.set_size_request(width, height)
+        self.connect('draw', self.do_draw_cb)
+        self.connect('configure-event', self.do_configure_event_cb)
+
+        fps = 30
+        GObject.timeout_add(1000 / fps, self.update)
+
+    def update(self):
+        if self.x - self.radius - self.border < 0 or \
+           self.x + self.radius + self.border > self.width:
+            self.x_offset *= -1
+
+        if self.y - self.radius - self.border < 0 or \
+           self.y + self.radius + self.border > self.height:
+            self.y_offset *= -1
+
+        self.x += self.x_offset
+        self.y += self.y_offset
+
+        self.queue_draw()
+        return True
+
+    def do_configure_event_cb(self, widget, event):
+        self.width = event.width
+        self.height = event.height
+
+    def do_draw_cb(self, widget, cr):
+
+        cr.rectangle(0, 0, self.width, self.height)
+        cr.set_source_rgb(1.0, 0.5, 0.5)
+        cr.fill()
+
+        cr.arc(self.x, self.y, self.radius, 0, 2 * math.pi)
+
+        cr.set_line_width(self.border)
+
+        _h = self.x / float(self.width)
+        _l = 0.5
+        _s = self.y / float(self.height)
+        _r, _g, _b = colorsys.hls_to_rgb(_h, _l, _s)
+        cr.set_source_rgb(_r, _g, _b)
+        cr.fill_preserve()
+
+        cr.set_source_rgb(0, 0, 0)
+        cr.stroke()
+
+
+class AnimatedApp(Gtk.Application):
+    def __init__(self, title, width, height, *args, **kwargs):
+        super(AnimatedApp, self).__init__(*args, **kwargs)
+        self.connect("activate", self.on_activate)
+        self.title = title
+        self.width = width
+        self.height = height
+
+    def on_activate(self, data=None):
+        window = Gtk.Window(type=Gtk.WindowType.TOPLEVEL)
+        window.set_title(self.title)
+
+        canvas = AnimatedCanvas(self.width, self.height)
+        window.add(canvas)
+        window.show_all()
+        self.add_window(window)
+
+
+if __name__ == "__main__":
+    app = AnimatedApp("AnimatedApp", 640, 480,
+            application_id="apps.test.animatedapp",
+            flags=Gio.ApplicationFlags.FLAGS_NONE)
+    app.run(None)
-- 
2.1.4