7d7372af43
The current Alpha value is an unsigned integer that can be used implicitly as a fixed point value. This makes writing an alpha function overshooting below and above the current range basically impossible without complicating an already complex code, and creating weird corner cases. For this reason, the Alpha value should be defined as a floating point normalized value, spanning a range between 0.0 and 1.0; in order to allow overshooting, the valid range is extended one unit below and one unit above, thus making it -1.0 .. 2.0. This commit updates the various users of the ClutterAlpha API and the tests cases. This commit also removes all the current alpha functions exposed in the public API.
113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
#include <stdlib.h>
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#include <gmodule.h>
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#include <clutter/clutter.h>
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static const ClutterGravity gravities[] = {
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CLUTTER_GRAVITY_NORTH_EAST,
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CLUTTER_GRAVITY_NORTH,
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CLUTTER_GRAVITY_NORTH_WEST,
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CLUTTER_GRAVITY_WEST,
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CLUTTER_GRAVITY_SOUTH_WEST,
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CLUTTER_GRAVITY_SOUTH,
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CLUTTER_GRAVITY_SOUTH_EAST,
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CLUTTER_GRAVITY_EAST,
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CLUTTER_GRAVITY_CENTER,
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CLUTTER_GRAVITY_NONE
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};
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static gint gindex = 0;
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static ClutterActor *label;
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static void
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set_next_gravity (ClutterActor *actor)
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{
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ClutterGravity gravity = gravities[gindex];
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GEnumClass *eclass;
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GEnumValue *evalue;
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clutter_actor_move_anchor_point_from_gravity (actor, gravities[gindex]);
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eclass = g_type_class_ref (CLUTTER_TYPE_GRAVITY);
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evalue = g_enum_get_value (eclass, gravity);
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clutter_text_set_text (CLUTTER_TEXT (label), evalue->value_nick);
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g_type_class_unref (eclass);
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if (++gindex >= G_N_ELEMENTS (gravities))
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gindex = 0;
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}
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static gdouble
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my_ramp_func (ClutterAlpha *alpha,
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gpointer unused)
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{
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ClutterTimeline *timeline = clutter_alpha_get_timeline (alpha);
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return clutter_timeline_get_progress (timeline);
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}
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G_MODULE_EXPORT int
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test_scale_main (int argc, char *argv[])
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{
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ClutterActor *stage, *rect;
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ClutterColor stage_color = { 0x0, 0x0, 0x0, 0xff };
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ClutterColor rect_color = { 0xff, 0xff, 0xff, 0x99 };
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ClutterTimeline *timeline;
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ClutterAlpha *alpha;
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ClutterBehaviour *behave;
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clutter_init (&argc, &argv);
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stage = clutter_stage_get_default ();
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clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
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clutter_actor_set_size (stage, 300, 300);
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rect = clutter_rectangle_new_with_color (&rect_color);
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clutter_actor_set_size (rect, 100, 100);
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clutter_actor_set_position (rect, 100, 100);
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clutter_group_add (CLUTTER_GROUP (stage), rect);
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label = clutter_text_new_with_text ("Sans 20px", "");
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clutter_text_set_color (CLUTTER_TEXT (label),
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&(ClutterColor) { 0xff, 0xff, 0xff, 0xff });
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clutter_actor_set_position (label,
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clutter_actor_get_x (rect),
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clutter_actor_get_y (rect)
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+ clutter_actor_get_height (rect));
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clutter_group_add (CLUTTER_GROUP (stage), label);
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rect_color.alpha = 0xff;
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rect = clutter_rectangle_new_with_color (&rect_color);
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clutter_actor_set_position (rect, 100, 100);
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clutter_actor_set_size (rect, 100, 100);
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set_next_gravity (rect);
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clutter_group_add (CLUTTER_GROUP (stage), rect);
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timeline = clutter_timeline_new_for_duration (750);
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alpha = clutter_alpha_new_with_func (timeline,
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my_ramp_func,
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NULL, NULL);
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behave = clutter_behaviour_scale_new (alpha,
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0.0, 0.0, /* scale start */
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1.0, 1.0); /* scale end */
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clutter_behaviour_apply (behave, rect);
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clutter_timeline_set_loop (timeline, TRUE);
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g_signal_connect_swapped (timeline, "completed",
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G_CALLBACK (set_next_gravity), rect);
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clutter_timeline_start (timeline);
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clutter_actor_show_all (stage);
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clutter_main();
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g_object_unref (timeline);
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g_object_unref (behave);
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return EXIT_SUCCESS;
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}
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