[clutter/wip/apocalypses/apocalypse-6: 8/10] interactive/transitions: An easing demo without animate()

[Emmanuele Bassi <ebassi src gnome org>]

commit 916dcdbd080dacc47325f8df61970cc419154756
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Thu Mar 15 11:24:46 2012 +0000

    interactive/transitions: An easing demo without animate()
    
    Use the newly added implicit animations support in ClutterActor.

 tests/interactive/Makefile.am        |    3 +-
 tests/interactive/test-transitions.c |  225 ++++++++++++++++++++++++++++++++++
 2 files changed, 227 insertions(+), 1 deletions(-)
---
diff --git a/tests/interactive/Makefile.am b/tests/interactive/Makefile.am
index e56ef11..a31e87c 100644
--- a/tests/interactive/Makefile.am
+++ b/tests/interactive/Makefile.am
@@ -55,7 +55,8 @@ UNIT_TESTS = \
 	test-state-script.c \
 	test-drop.c \
 	test-devices.c \
-	test-actor.c
+	test-actor.c \
+	test-transitions.c
 
 if X11_TESTS
 UNIT_TESTS += test-pixmap.c
diff --git a/tests/interactive/test-transitions.c b/tests/interactive/test-transitions.c
new file mode 100644
index 0000000..194a6bd
--- /dev/null
+++ b/tests/interactive/test-transitions.c
@@ -0,0 +1,225 @@
+#include <stdlib.h>
+#include <gmodule.h>
+#include <clutter/clutter.h>
+
+/* all the easing modes provided by Clutter */
+static const struct {
+  const gchar *name;
+  ClutterAnimationMode mode;
+} easing_modes[] = {
+  { "linear", CLUTTER_LINEAR },
+  { "easeInQuad", CLUTTER_EASE_IN_QUAD },
+  { "easeOutQuad", CLUTTER_EASE_OUT_QUAD },
+  { "easeInOutQuad", CLUTTER_EASE_IN_OUT_QUAD },
+  { "easeInCubic", CLUTTER_EASE_IN_CUBIC },
+  { "easeOutCubic", CLUTTER_EASE_OUT_CUBIC },
+  { "easeInOutCubic", CLUTTER_EASE_IN_OUT_CUBIC },
+  { "easeInQuart", CLUTTER_EASE_IN_QUART },
+  { "easeOutQuart", CLUTTER_EASE_OUT_QUART },
+  { "easeInOutQuart", CLUTTER_EASE_IN_OUT_QUART },
+  { "easeInQuint", CLUTTER_EASE_IN_QUINT },
+  { "easeOutQuint", CLUTTER_EASE_OUT_QUINT },
+  { "easeInOutQuint", CLUTTER_EASE_IN_OUT_QUINT },
+  { "easeInSine", CLUTTER_EASE_IN_SINE },
+  { "easeOutSine", CLUTTER_EASE_OUT_SINE },
+  { "easeInOutSine", CLUTTER_EASE_IN_OUT_SINE },
+  { "easeInExpo", CLUTTER_EASE_IN_EXPO },
+  { "easeOutExpo", CLUTTER_EASE_OUT_EXPO },
+  { "easeInOutExpo", CLUTTER_EASE_IN_OUT_EXPO },
+  { "easeInCirc", CLUTTER_EASE_IN_CIRC },
+  { "easeOutCirc", CLUTTER_EASE_OUT_CIRC },
+  { "easeInOutCirc", CLUTTER_EASE_IN_OUT_CIRC },
+  { "easeInElastic", CLUTTER_EASE_IN_ELASTIC },
+  { "easeOutElastic", CLUTTER_EASE_OUT_ELASTIC },
+  { "easeInOutElastic", CLUTTER_EASE_IN_OUT_ELASTIC },
+  { "easeInBack", CLUTTER_EASE_IN_BACK },
+  { "easeOutBack", CLUTTER_EASE_OUT_BACK },
+  { "easeInOutBack", CLUTTER_EASE_IN_OUT_BACK },
+  { "easeInBounce", CLUTTER_EASE_IN_BOUNCE },
+  { "easeOutBounce", CLUTTER_EASE_OUT_BOUNCE },
+  { "easeInOutBounce", CLUTTER_EASE_IN_OUT_BOUNCE },
+};
+
+#define HELP_TEXT       "Easing mode: %s (%d of %d)\n" \
+                        "Left click to tween\n" \
+                        "Right click to change the easing mode"
+
+static const gint n_easing_modes = G_N_ELEMENTS (easing_modes);
+static gint current_mode = 0;
+
+static gint duration = 1;
+
+static ClutterActor *main_stage = NULL;
+static ClutterActor *easing_mode_label = NULL;
+
+static gboolean
+on_button_press (ClutterActor       *actor,
+                 ClutterButtonEvent *event,
+                 ClutterActor       *rectangle)
+{
+  if (event->button == CLUTTER_BUTTON_SECONDARY)
+    {
+      gchar *text;
+
+      /* cycle through the various easing modes */
+      current_mode = (current_mode + 1 < n_easing_modes)
+                   ? current_mode + 1
+                   : 0;
+
+      /* update the text of the label */
+      text = g_strdup_printf (HELP_TEXT,
+                              easing_modes[current_mode].name,
+                              current_mode + 1,
+                              n_easing_modes);
+
+      clutter_text_set_text (CLUTTER_TEXT (easing_mode_label), text);
+      g_free (text);
+    }
+  else if (event->button == CLUTTER_BUTTON_PRIMARY)
+    {
+      ClutterAnimationMode cur_mode;
+
+      cur_mode = easing_modes[current_mode].mode;
+
+      /* tween the actor using the current easing mode */
+      clutter_actor_set_easing_mode (rectangle, cur_mode);
+      clutter_actor_set_easing_duration (rectangle, duration * 1000);
+
+      clutter_actor_set_position (rectangle, event->x, event->y);
+    }
+
+  return TRUE;
+}
+
+static gboolean
+draw_bouncer (ClutterCairoTexture *texture,
+              cairo_t             *cr)
+{
+  const ClutterColor *bouncer_color;
+  cairo_pattern_t *pattern;
+  guint width, height;
+  float radius;
+
+  clutter_cairo_texture_get_surface_size (texture, &width, &height);
+
+  radius = MAX (width, height);
+
+  clutter_cairo_texture_clear (texture);
+
+  cairo_arc (cr, radius / 2, radius / 2, radius / 2, 0.0, 2.0 * G_PI);
+
+  bouncer_color = CLUTTER_COLOR_DarkScarletRed;
+
+  pattern = cairo_pattern_create_radial (radius / 2, radius / 2, 0,
+                                         radius, radius, radius);
+  cairo_pattern_add_color_stop_rgba (pattern,
+                                     0,
+                                     bouncer_color->red / 255.0,
+                                     bouncer_color->green / 255.0,
+                                     bouncer_color->blue / 255.0,
+                                     bouncer_color->alpha / 255.0);
+  cairo_pattern_add_color_stop_rgba (pattern,
+                                     0.85,
+                                     bouncer_color->red / 255.0,
+                                     bouncer_color->green / 255.0,
+                                     bouncer_color->blue / 255.0,
+                                     0.25);
+
+  cairo_set_source (cr, pattern);
+  cairo_fill_preserve (cr);
+
+  cairo_pattern_destroy (pattern);
+
+  return TRUE;
+}
+
+static ClutterActor *
+make_bouncer (gfloat width,
+              gfloat height)
+{
+  ClutterActor *retval;
+
+  retval = clutter_cairo_texture_new (width, height);
+  g_signal_connect (retval, "draw", G_CALLBACK (draw_bouncer), NULL);
+
+  clutter_actor_set_name (retval, "bouncer");
+  clutter_actor_set_size (retval, width, height);
+  clutter_actor_set_anchor_point (retval, width / 2, height / 2);
+  clutter_actor_set_reactive (retval, TRUE);
+
+  /* make sure we draw the bouncer immediately */
+  clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (retval));
+
+  return retval;
+}
+
+static GOptionEntry test_easing_entries[] = {
+  {
+    "duration", 'd',
+    0,
+    G_OPTION_ARG_INT, &duration,
+    "Duration of the animation",
+    "SECONDS"
+  },
+
+  { NULL }
+};
+
+G_MODULE_EXPORT int
+test_transitions_main (int argc, char *argv[])
+{
+  ClutterActor *stage, *rect, *label;
+  gchar *text;
+  gfloat stage_width, stage_height;
+  GError *error = NULL;
+
+  if (clutter_init_with_args (&argc, &argv,
+                              NULL,
+                              test_easing_entries,
+                              NULL,
+                              &error) != CLUTTER_INIT_SUCCESS)
+    return 1;
+
+  stage = clutter_stage_new ();
+  clutter_stage_set_title (CLUTTER_STAGE (stage), "Easing Modes");
+  clutter_actor_set_background_color (stage, CLUTTER_COLOR_LightSkyBlue);
+  g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
+  main_stage = stage;
+
+  clutter_actor_get_size (stage, &stage_width, &stage_height);
+
+  /* create the actor that we want to tween */
+  rect = make_bouncer (50, 50);
+  clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
+  clutter_actor_set_position (rect, stage_width / 2, stage_height / 2);
+
+  text = g_strdup_printf (HELP_TEXT,
+                          easing_modes[current_mode].name,
+                          current_mode + 1,
+                          n_easing_modes);
+
+  label = clutter_text_new ();
+  clutter_container_add_actor (CLUTTER_CONTAINER (stage), label);
+  clutter_text_set_text (CLUTTER_TEXT (label), text);
+  clutter_actor_add_constraint (label, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.95));
+  clutter_actor_add_constraint (label, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.95));
+  easing_mode_label = label;
+
+  g_free (text);
+
+  g_signal_connect (stage,
+                    "button-press-event", G_CALLBACK (on_button_press),
+                    rect);
+
+  clutter_actor_show (stage);
+
+  clutter_main ();
+
+  return EXIT_SUCCESS;
+}
+
+G_MODULE_EXPORT const char *
+test_transitions_describe (void)
+{
+  return "Visualize all easing modes provided by Clutter";
+}