Clutter の position_z

Clutter ネタは、書き留めていたものが無くなったので、しばらく休みます。
Clutter-1.12.0 から ClutterActor の depth がなくなり、 position_z に変わったので、そのサンプルです。単純に pozition_z を変えているだけです。
まずは C から

#include <clutter/clutter.h>

void
on_completed (ClutterTimeline *timeline, gpointer user_data) 
{
    ClutterActor *actor;
    gfloat z;
    
    actor = * (ClutterActor**)user_data;
    z = clutter_actor_get_z_position (actor);
    clutter_actor_save_easing_state (actor);
    if (z > 0)
    {
        clutter_actor_set_z_position (actor, -100);
    }
    else
    {
        clutter_actor_set_z_position (actor, 100);
    }
    clutter_actor_restore_easing_state (actor);
}

int
main (int argc, char *argv[])
{
    ClutterActor *stage, *actor;
    ClutterTimeline *timeline;
    
    if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
        return 1;
    stage = clutter_stage_new ();
    g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);

    actor = clutter_actor_new ();
    clutter_actor_set_background_color (actor, clutter_color_get_static (CLUTTER_COLOR_RED));
    clutter_actor_set_size (actor, 100, 100);
    clutter_actor_set_position (actor, 100, 100);
    
    timeline = clutter_timeline_new (2000);
    clutter_timeline_set_repeat_count (timeline, -1);
    g_signal_connect (timeline, "completed", G_CALLBACK (on_completed), &actor);
    clutter_timeline_start (timeline);

    clutter_actor_add_child (stage, actor);
    clutter_actor_show (stage);
    clutter_main ();
    return 0;
}

clutter_actor_set_z_position() と clutter_actor_get_z_position() を使っているだけなので、説明不要ですね。
Gjs でも同様に動作します。

#! /usr/bin/env gjs
const Clutter = imports.gi.Clutter;

function on_completed (timeline) 
{
    let z = actor.get_z_position();
    actor.save_easing_state();
    if (z > 0) {
        actor.set_z_position(-100);
    } else {
        actor.set_z_position(100);
    }
    actor.save_easing_state();
}

Clutter.init(null);
let stage = new Clutter.Stage();
stage.connect('destroy', Clutter.main_quit);

let actor = new Clutter.Actor();
actor.set_background_color(Clutter.Color.get_static (Clutter.StaticColor.RED));
actor.set_size(100, 100);
actor.set_position(100, 100);

let timeline = new Clutter.Timeline({duration:2000});
timeline.set_repeat_count(-1);
timeline.connect('completed', on_completed);
timeline.start();

stage.add_child(actor);
stage.show();
Clutter.main();

簡単ですね。

しばらく休んで、次のネタを考えます。ではでは