cookbook: Added complex animations example

To support recipe about using ClutterAnimator to create
complex animations.

doc/cookbook/examples/animations-complex.c

@@ -0,0 +1,64 @@
+#include <stdlib.h>
+#include <clutter/clutter.h>
+
+#define UI_FILE "animations-complex.json"
+
+/*
+ * start the animation when a key is pressed;
+ * see the signals recipe in the Script chapter for more details
+ */
+gboolean
+foo_key_pressed_cb (ClutterActor *actor,
+                    ClutterEvent *event,
+                    gpointer      user_data)
+{
+  ClutterScript *script = CLUTTER_SCRIPT (user_data);
+
+  ClutterAnimator *animator;
+  clutter_script_get_objects (script,
+                              "animator", &animator,
+                              NULL);
+
+  if (clutter_timeline_is_playing (clutter_animator_get_timeline (animator)))
+    return FALSE;
+
+  clutter_animator_start (animator);
+
+  return TRUE;
+}
+
+int
+main (int argc, char *argv[])
+{
+  ClutterScript *script;
+  ClutterActor *stage;
+
+  GError *error = NULL;
+
+  clutter_init (&argc, &argv);
+
+  script = clutter_script_new ();
+  clutter_script_load_from_file (script, UI_FILE, &error);
+
+  if (error != NULL)
+   {
+     g_critical ("Error loading ClutterScript file %s\n%s", UI_FILE, error->message);
+     g_error_free (error);
+     exit (EXIT_FAILURE);
+   }
+
+  /* connect signal handlers as defined in the script */
+  clutter_script_connect_signals (script, script);
+
+  clutter_script_get_objects (script,
+                              "stage", &stage,
+                              NULL);
+
+  clutter_actor_show (stage);
+
+  clutter_main ();
+
+  g_object_unref (script);
+
+  return EXIT_SUCCESS;
+}