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docs: Update test-easing and xinclude it into ClutterAnimation

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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 2011-09-05 15:26:27 +01:00
parent 7024f1cd02
commit 967bd3ac58
2 changed files with 54 additions and 45 deletions
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9
clutter/clutter-animation.c
View File

@ -129,6 +129,15 @@
* </variablelist>
* </refsect2>
*
* <example id="example-clutter-animation">
* <title>Tweening using clutter_actor_animate()</title>
* <programlisting>
* <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../tests/interactive/test-easing.c">
* <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
* </xi:include>
* </programlisting>
* </example>
*
* #ClutterAnimation is available since Clutter 1.0
*/

90
tests/interactive/test-easing.c
View File

@ -2,7 +2,8 @@
#include <gmodule.h>
#include <clutter/clutter.h>
const struct {
/* all the easing modes provided by Clutter */
static const struct {
const gchar *name;
ClutterAnimationMode mode;
} easing_modes[] = {
@ -39,23 +40,28 @@ const struct {
{ "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 gboolean recenter = FALSE;
static ClutterActor *main_stage = NULL;
static ClutterActor *main_stage = NULL;
static ClutterActor *easing_mode_label = NULL;
static ClutterAnimation *last_animation = NULL;
static ClutterColor stage_color = { 0x88, 0x88, 0xdd, 0xff };
static ClutterColor bouncer_color = { 0xee, 0x33, 0, 0xff };
/* recenter_bouncer:
*
* repositions (through an animation) the bouncer at the center of the stage
*/
static void
on_animation_completed (ClutterAnimation *animation,
ClutterActor *rectangle)
recenter_bouncer (ClutterAnimation *animation,
ClutterActor *rectangle)
{
gfloat base_x, base_y;
gint cur_mode;
@ -65,7 +71,7 @@ on_animation_completed (ClutterAnimation *animation,
cur_mode = easing_modes[current_mode].mode;
clutter_actor_animate (rectangle, cur_mode, 150,
clutter_actor_animate (rectangle, cur_mode, 250,
"x", base_x,
"y", base_y,
NULL);
@ -79,31 +85,20 @@ on_button_press (ClutterActor *actor,
if (event->button == 3)
{
gchar *text;
gfloat stage_width, stage_height;
gfloat label_width, label_height;
current_mode = (current_mode + 1 < n_easing_modes) ? current_mode + 1
: 0;
/* cycle through the various easing modes */
current_mode = (current_mode + 1 < n_easing_modes)
? current_mode + 1
: 0;
text = g_strdup_printf ("Easing mode: %s (%d of %d)\n"
"Right click to change the easing mode",
/* 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);
clutter_actor_get_size (main_stage,
&stage_width,
&stage_height);
clutter_actor_get_size (easing_mode_label,
&label_width,
&label_height);
clutter_actor_set_position (easing_mode_label,
stage_width - label_width - 10,
stage_height - label_height - 10);
}
else if (event->button == 1)
{
@ -112,15 +107,20 @@ on_button_press (ClutterActor *actor,
cur_mode = easing_modes[current_mode].mode;
/* tween the actor using the current easing mode */
animation =
clutter_actor_animate (rectangle, cur_mode, duration * 1000,
"x", event->x,
"y", event->y,
NULL);
/* if we were asked to, recenter the bouncer at the end of the
* animation. we keep track of the animation to avoid connecting
* the signal handler to the same Animation twice.
*/
if (recenter && last_animation != animation)
g_signal_connect_after (animation, "completed",
G_CALLBACK (on_animation_completed),
G_CALLBACK (recenter_bouncer),
rectangle);
last_animation = animation;
@ -133,9 +133,10 @@ static gboolean
draw_bouncer (ClutterCairoTexture *texture,
cairo_t *cr)
{
const ClutterColor *bouncer_color;
cairo_pattern_t *pattern;
guint width, height;
float radius;
cairo_pattern_t *pattern;
clutter_cairo_texture_get_surface_size (texture, &width, &height);
@ -145,20 +146,22 @@ draw_bouncer (ClutterCairoTexture *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);
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,
0.9,
bouncer_color.red / 255.0,
bouncer_color.green / 255.0,
bouncer_color.blue / 255.0,
0.1);
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);
@ -182,6 +185,7 @@ make_bouncer (gfloat width,
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;
@ -212,7 +216,6 @@ test_easing_main (int argc, char *argv[])
ClutterActor *stage, *rect, *label;
gchar *text;
gfloat stage_width, stage_height;
gfloat label_width, label_height;
GError *error = NULL;
if (clutter_init_with_args (&argc, &argv,
@ -224,30 +227,27 @@ test_easing_main (int argc, char *argv[])
stage = clutter_stage_new ();
clutter_stage_set_title (CLUTTER_STAGE (stage), "Easing Modes");
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
clutter_stage_set_color (CLUTTER_STAGE (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 ("Easing mode: %s (%d of %d)\n"
"Right click to change the easing mode",
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_font_name (CLUTTER_TEXT (label), "Sans 18px");
clutter_text_set_text (CLUTTER_TEXT (label), text);
clutter_actor_get_size (label, &label_width, &label_height);
clutter_actor_set_position (label,
stage_width - label_width - 10,
stage_height - label_height - 10);
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);