hud observation for generic game objects

src/lib/MotionEngine.js

@@ -26,6 +26,8 @@ class MotionEngine {
             return target;
         }
 
+        // a = {o-object, a-action, t-time, f-finish event, d-delay, m-mode, r-repeat, 
+        // rd-repeat the delay, rf-reset on finish}
         this.add = function (a) {
             a = Array.isArray(a) ? a : [a];
             a.forEach(e => {
@@ -35,7 +37,7 @@ class MotionEngine {
 
         this.clear = function (object) {
             for (var i = aq.length - 1; i >= 0; i--) {
-                if (object && aq[i].o == object || !object && aq[i].ct == aq[i].t) {
+                if (object && aq[i].o == object || !object && (aq[i].ct == aq[i].t || aq[i].rr)) {
                     aq.splice(i, 1);
                 }
             }
@@ -75,7 +77,11 @@ class MotionEngine {
             e.ct = e.ct + t;
             if (e.ct > e.t) {
                 e.ct = e.t;
-                e.f && e.f();
+                e.f?.();
+                if (e.rf){
+                    e.ct = t = 0;
+                    e.rr = true;
+                }
             }
             calcValues(e.o, e.a, e.iv, e.ct / e.t, e.m || 'value');
             if (e.ct == e.t && e.r) {