cookbook: Add example code for animated rotation

Add example code demonstrating how to rotate in the x,y,z
axes using ClutterState. Integrated with build.

diff --git a/doc/cookbook/examples/.gitignore b/doc/cookbook/examples/.gitignore
index 7f90480..b07d111 100644 (file)
--- a/doc/cookbook/examples/.gitignore
+++ b/doc/cookbook/examples/.gitignore
@@ -1,2 +1,3 @@
 /text-shadow
 /textures-reflection
+/animations-rotating

diff --git a/doc/cookbook/examples/Makefile.am b/doc/cookbook/examples/Makefile.am
index 5353a9d..1ac230b 100644 (file)
--- a/doc/cookbook/examples/Makefile.am
+++ b/doc/cookbook/examples/Makefile.am
@@ -5,6 +5,7 @@ NULL =
 noinst_PROGRAMS = \
        textures-reflection     \
        text-shadow             \
+       animations-rotating \
        $(NULL)
 
 INCLUDES = \
@@ -29,3 +30,5 @@ AM_LDFLAGS = $(CLUTTER_LIBS)
 textures_reflection_SOURCES    = textures-reflection.c
 
 text_shadow_SOURCES            = text-shadow.c
+
+animations_rotating_SOURCE = animations-rotating.c

diff --git a/doc/cookbook/examples/animations-rotating.c b/doc/cookbook/examples/animations-rotating.c
new file mode 100644 (file)
index 0000000..23985e7
--- /dev/null
+++ b/doc/cookbook/examples/animations-rotating.c
@@ -0,0 +1,136 @@
+#include <clutter/clutter.h>
+
+#define ROTATION_ANGLE 75.0
+#define DURATION       2000
+
+static void
+_set_next_state (ClutterState *transitions,
+                 gpointer      user_data)
+{
+  const gchar *current = clutter_state_get_state (transitions);
+  gchar *next_state = "start";
+
+  if (g_strcmp0 (current, "start") == 0)
+    next_state = "x-cw";
+  else if (g_strcmp0 (current, "x-cw") == 0)
+    next_state = "x-ccw";
+  else if (g_strcmp0 (current, "x-ccw") == 0)
+    next_state = "x-after";
+  else if (g_strcmp0 (current, "x-after") == 0)
+    next_state = "y-cw";
+  else if (g_strcmp0 (current, "y-cw") == 0)
+    next_state = "y-ccw";
+  else if (g_strcmp0 (current, "y-ccw") == 0)
+    next_state = "y-after";
+  else if (g_strcmp0 (current, "y-after") == 0)
+    next_state = "z-cw";
+  else if (g_strcmp0 (current, "z-cw") == 0)
+    next_state = "z-ccw";
+
+  clutter_state_set_state (transitions, next_state);
+}
+
+int
+main (int argc, char *argv[])
+{
+  ClutterActor *stage;
+  ClutterActor *texture;
+  ClutterState *transitions;
+  GError *error = NULL;
+  gfloat texture_width, texture_height;
+
+  clutter_init (&argc, &argv);
+
+  stage = clutter_stage_get_default ();
+  g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
+
+  texture = clutter_texture_new ();
+  clutter_actor_add_constraint (texture,
+                                clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
+  clutter_actor_add_constraint (texture,
+                                clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
+  clutter_texture_set_sync_size (CLUTTER_TEXTURE (texture), TRUE);
+  clutter_texture_set_from_file (CLUTTER_TEXTURE (texture),
+                                 TESTS_DATA_DIR "/redhand.png",
+                                 &error);
+
+  if (error != NULL)
+    {
+      g_error ("Problem loading image into texture - %s", error->message);
+      g_error_free (error);
+      return 1;
+    }
+
+  clutter_actor_get_size (texture, &texture_width, &texture_height);
+  clutter_actor_set_size (stage, texture_width * 2, texture_height * 2);
+
+  /* set all centres of rotation to the centre of the texture */
+  clutter_actor_set_rotation (texture,
+                              CLUTTER_X_AXIS,
+                              0.0,
+                              texture_width * 0.5,
+                              texture_height * 0.5,
+                              0.0);
+  clutter_actor_set_rotation (texture,
+                              CLUTTER_Y_AXIS,
+                              0.0,
+                              texture_width * 0.5,
+                              texture_height * 0.5,
+                              0.0);
+  clutter_actor_set_z_rotation_from_gravity (texture, 0.0, CLUTTER_GRAVITY_CENTER);
+
+  clutter_container_add_actor (CLUTTER_CONTAINER (stage), texture);
+
+  /* set up the animations */
+  transitions = clutter_state_new ();
+
+  clutter_state_set (transitions, NULL, "start",
+                     texture, "rotation-angle-x", CLUTTER_LINEAR, 0.0,
+                     texture, "rotation-angle-y", CLUTTER_LINEAR, 0.0,
+                     texture, "rotation-angle-z", CLUTTER_LINEAR, 0.0,
+                     NULL);
+  clutter_state_set (transitions, NULL, "x-cw",
+                     texture, "rotation-angle-x", CLUTTER_LINEAR, ROTATION_ANGLE,
+                     NULL);
+  clutter_state_set (transitions, NULL, "x-ccw",
+                     texture, "rotation-angle-x", CLUTTER_LINEAR, -ROTATION_ANGLE,
+                     NULL);
+  clutter_state_set (transitions, NULL, "x-after",
+                     texture, "rotation-angle-x", CLUTTER_LINEAR, 0.0,
+                     NULL);
+  clutter_state_set (transitions, NULL, "y-cw",
+                     texture, "rotation-angle-y", CLUTTER_LINEAR, ROTATION_ANGLE,
+                     NULL);
+  clutter_state_set (transitions, NULL, "y-ccw",
+                     texture, "rotation-angle-y", CLUTTER_LINEAR, -ROTATION_ANGLE,
+                     NULL);
+  clutter_state_set (transitions, NULL, "y-after",
+                     texture, "rotation-angle-y", CLUTTER_LINEAR, 0.0,
+                     NULL);
+  clutter_state_set (transitions, NULL, "z-cw",
+                     texture, "rotation-angle-z", CLUTTER_LINEAR, ROTATION_ANGLE,
+                     NULL);
+  clutter_state_set (transitions, NULL, "z-ccw",
+                     texture, "rotation-angle-z", CLUTTER_LINEAR, -ROTATION_ANGLE,
+                     NULL);
+  clutter_state_set_duration (transitions, NULL, NULL, DURATION);
+  clutter_state_set_duration (transitions, "start", NULL, DURATION * 0.5);
+  clutter_state_set_duration (transitions, NULL, "start", DURATION * 0.5);
+  clutter_state_set_duration (transitions, NULL, "x-after", DURATION * 0.5);
+  clutter_state_set_duration (transitions, NULL, "y-after", DURATION * 0.5);
+
+  clutter_state_warp_to_state (transitions, "start");
+
+  g_signal_connect (transitions,
+                    "completed",
+                    G_CALLBACK (_set_next_state),
+                    NULL);
+
+  clutter_state_set_state (transitions, "x-cw");
+
+  clutter_actor_show (stage);
+
+  clutter_main ();
+
+  return 0;
+}