Clutter example

rectangle.json

[
	{
		"id"       : "stage",
		"type"     : "ClutterStage",
		"width"    : 800,
		"height"   : 600,
		"color"    : "black",
		"children" : [ "rectangle" ],
		"signals"  :
		[
			{
				"name"    : "destroy",
				"handler" : "clutter_main_quit"
			}
		]
	},
	{
		"id"                        : "rectangle",
		"type"                      : "ClutterRectangle",
		"width"                     : 600,
		"height"                    : 450,
		"x"                         : 100,
		"y"                         : 75,
		"color"                     : "blue",
		"rotation-center-z-gravity" : "center",
		"reactive"                  : true,
		"signals"                   :
		[
			{
				"name"         : "enter-event",
				"states"       : "rectangle-states",
				"target-state" : "hover"
			},
			{
				"name"         : "leave-event",
				"states"       : "rectangle-states",
				"target-state" : "base"
			}
		],
		"actions" :
		[
			{
				"type"    : "ClutterClickAction",
				"signals" :
				[
					{
						"name"         : "clicked",
						"states"       : "rectangle-states",
						"target-state" : "clicked"
					}
				]
			}
		]
	},
	{
		"id"          : "rectangle-states",
		"type"        : "ClutterState",
		"duration"    : 1000,
		"transitions" :
		[
			{
				"source" : null,
				"target" : "hover",
				"keys"   :
				[
					[ "rectangle", "color", "linear", "red" ]
				]
			},
			{
				"source" : null,
				"target" : "base",
				"keys"   :
				[
					[ "rectangle", "color", "linear", "blue" ]
				]
			},
			{
				"source" : null,
				"target" : "clicked",
				"keys"   :
				[
					[ "rectangle", "rotation-angle-z" "ease-in-out-quad", 360.0 ]
				]
			}
		]
	}
]

rectangle.py

#!/usr/bin/env python

from gi.repository import Clutter

class Rectangle(Clutter.Script):
	def __init__(self):
		Clutter.Script.__init__(self)

		self.load_from_file("rectangle.json")
		self.connect_signals(self)

		stage = self.get_object("stage")
		stage.show()

if __name__ == "__main__":
	Clutter.init(None)

	view = Rectangle()
	Clutter.main()