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docs: Update test-easing and xinclude it into ClutterAnimation
The easing test is a nice example of what ClutterAnimation and clutter_actor_animate() can do. The "tween ball to the pointer event coordinates" is a bit of a staple in animation libraries and their documentation.
This commit is contained in:
Emmanuele Bassi
parent
7024f1cd02
commit
967bd3ac58
@ -129,6 +129,15 @@
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* </variablelist>
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* </refsect2>
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*
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* <example id="example-clutter-animation">
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* <title>Tweening using clutter_actor_animate()</title>
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* <programlisting>
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* <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../tests/interactive/test-easing.c">
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* <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
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* </xi:include>
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* </programlisting>
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* </example>
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*
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* #ClutterAnimation is available since Clutter 1.0
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*/
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@ -2,7 +2,8 @@
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#include <gmodule.h>
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#include <clutter/clutter.h>
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const struct {
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/* all the easing modes provided by Clutter */
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static const struct {
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const gchar *name;
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ClutterAnimationMode mode;
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} easing_modes[] = {
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@ -39,23 +40,28 @@ const struct {
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{ "easeInOutBounce", CLUTTER_EASE_IN_OUT_BOUNCE },
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};
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#define HELP_TEXT "Easing mode: %s (%d of %d)\n" \
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"Left click to tween\n" \
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"Right click to change the easing mode"
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static const gint n_easing_modes = G_N_ELEMENTS (easing_modes);
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static gint current_mode = 0;
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static gint duration = 1;
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static gboolean recenter = FALSE;
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static ClutterActor *main_stage = NULL;
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static ClutterActor *main_stage = NULL;
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static ClutterActor *easing_mode_label = NULL;
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static ClutterAnimation *last_animation = NULL;
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static ClutterColor stage_color = { 0x88, 0x88, 0xdd, 0xff };
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static ClutterColor bouncer_color = { 0xee, 0x33, 0, 0xff };
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/* recenter_bouncer:
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*
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* repositions (through an animation) the bouncer at the center of the stage
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*/
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static void
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on_animation_completed (ClutterAnimation *animation,
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ClutterActor *rectangle)
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recenter_bouncer (ClutterAnimation *animation,
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ClutterActor *rectangle)
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{
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gfloat base_x, base_y;
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gint cur_mode;
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@ -65,7 +71,7 @@ on_animation_completed (ClutterAnimation *animation,
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cur_mode = easing_modes[current_mode].mode;
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clutter_actor_animate (rectangle, cur_mode, 150,
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clutter_actor_animate (rectangle, cur_mode, 250,
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"x", base_x,
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"y", base_y,
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NULL);
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@ -79,31 +85,20 @@ on_button_press (ClutterActor *actor,
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if (event->button == 3)
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{
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gchar *text;
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gfloat stage_width, stage_height;
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gfloat label_width, label_height;
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current_mode = (current_mode + 1 < n_easing_modes) ? current_mode + 1
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: 0;
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/* cycle through the various easing modes */
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current_mode = (current_mode + 1 < n_easing_modes)
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? current_mode + 1
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: 0;
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text = g_strdup_printf ("Easing mode: %s (%d of %d)\n"
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"Right click to change the easing mode",
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/* update the text of the label */
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text = g_strdup_printf (HELP_TEXT,
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easing_modes[current_mode].name,
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current_mode + 1,
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n_easing_modes);
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clutter_text_set_text (CLUTTER_TEXT (easing_mode_label), text);
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g_free (text);
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clutter_actor_get_size (main_stage,
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&stage_width,
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&stage_height);
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clutter_actor_get_size (easing_mode_label,
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&label_width,
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&label_height);
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clutter_actor_set_position (easing_mode_label,
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stage_width - label_width - 10,
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stage_height - label_height - 10);
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}
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else if (event->button == 1)
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{
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@ -112,15 +107,20 @@ on_button_press (ClutterActor *actor,
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cur_mode = easing_modes[current_mode].mode;
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/* tween the actor using the current easing mode */
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animation =
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clutter_actor_animate (rectangle, cur_mode, duration * 1000,
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"x", event->x,
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"y", event->y,
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NULL);
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/* if we were asked to, recenter the bouncer at the end of the
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* animation. we keep track of the animation to avoid connecting
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* the signal handler to the same Animation twice.
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*/
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if (recenter && last_animation != animation)
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g_signal_connect_after (animation, "completed",
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G_CALLBACK (on_animation_completed),
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G_CALLBACK (recenter_bouncer),
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rectangle);
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last_animation = animation;
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@ -133,9 +133,10 @@ static gboolean
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draw_bouncer (ClutterCairoTexture *texture,
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cairo_t *cr)
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{
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const ClutterColor *bouncer_color;
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cairo_pattern_t *pattern;
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guint width, height;
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float radius;
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cairo_pattern_t *pattern;
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clutter_cairo_texture_get_surface_size (texture, &width, &height);
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@ -145,20 +146,22 @@ draw_bouncer (ClutterCairoTexture *texture,
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cairo_arc (cr, radius / 2, radius / 2, radius / 2, 0.0, 2.0 * G_PI);
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bouncer_color = CLUTTER_COLOR_DarkScarletRed;
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pattern = cairo_pattern_create_radial (radius / 2, radius / 2, 0,
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radius, radius, radius);
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cairo_pattern_add_color_stop_rgba (pattern,
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0,
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bouncer_color.red / 255.0,
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bouncer_color.green / 255.0,
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bouncer_color.blue / 255.0,
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bouncer_color.alpha / 255.0);
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bouncer_color->red / 255.0,
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bouncer_color->green / 255.0,
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bouncer_color->blue / 255.0,
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bouncer_color->alpha / 255.0);
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cairo_pattern_add_color_stop_rgba (pattern,
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0.9,
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bouncer_color.red / 255.0,
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bouncer_color.green / 255.0,
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bouncer_color.blue / 255.0,
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0.1);
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0.85,
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bouncer_color->red / 255.0,
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bouncer_color->green / 255.0,
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bouncer_color->blue / 255.0,
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0.25);
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cairo_set_source (cr, pattern);
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cairo_fill_preserve (cr);
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@ -182,6 +185,7 @@ make_bouncer (gfloat width,
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clutter_actor_set_anchor_point (retval, width / 2, height / 2);
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clutter_actor_set_reactive (retval, TRUE);
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/* make sure we draw the bouncer immediately */
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clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (retval));
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return retval;
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@ -212,7 +216,6 @@ test_easing_main (int argc, char *argv[])
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ClutterActor *stage, *rect, *label;
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gchar *text;
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gfloat stage_width, stage_height;
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gfloat label_width, label_height;
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GError *error = NULL;
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if (clutter_init_with_args (&argc, &argv,
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@ -224,30 +227,27 @@ test_easing_main (int argc, char *argv[])
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stage = clutter_stage_new ();
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clutter_stage_set_title (CLUTTER_STAGE (stage), "Easing Modes");
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clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
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clutter_stage_set_color (CLUTTER_STAGE (stage), CLUTTER_COLOR_LightSkyBlue);
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g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
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main_stage = stage;
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clutter_actor_get_size (stage, &stage_width, &stage_height);
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/* create the actor that we want to tween */
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rect = make_bouncer (50, 50);
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
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clutter_actor_set_position (rect, stage_width / 2, stage_height / 2);
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text = g_strdup_printf ("Easing mode: %s (%d of %d)\n"
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"Right click to change the easing mode",
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text = g_strdup_printf (HELP_TEXT,
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easing_modes[current_mode].name,
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current_mode + 1,
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n_easing_modes);
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label = clutter_text_new ();
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), label);
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clutter_text_set_font_name (CLUTTER_TEXT (label), "Sans 18px");
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clutter_text_set_text (CLUTTER_TEXT (label), text);
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clutter_actor_get_size (label, &label_width, &label_height);
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clutter_actor_set_position (label,
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stage_width - label_width - 10,
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stage_height - label_height - 10);
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clutter_actor_add_constraint (label, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.95));
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clutter_actor_add_constraint (label, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.95));
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easing_mode_label = label;
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g_free (text);
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