新增DelayedIteratingSystem/IntervalSystem/IntervalIteratingSystem

source/src/ECS/Systems/IntervalSystem.ts

@@ -0,0 +1,40 @@
+module es {
+    /**
+     * 实体系统以一定的时间间隔进行处理
+     */
+    export abstract class IntervalSystem extends EntitySystem {
+        /**
+         * 累积增量以跟踪间隔 
+         */
+        protected acc: number = 0;
+        /**
+         * 更新之间需要等待多长时间
+         */
+        private readonly interval: number = 0;
+        private intervalDelta: number = 0;
+
+        constructor(matcher: Matcher, interval: number) {
+            super(matcher);
+            this.interval = interval;
+        }
+
+        protected checkProcessing() {
+            this.acc += Time.deltaTime;
+            if (this.acc >= this.interval) {
+                this.acc -= this.interval;
+                this.intervalDelta = (this.acc - this.intervalDelta);
+
+                return true;
+            }
+
+            return false;
+        }
+
+        /**
+         * 获取本系统上次处理后的实际delta值
+         */
+        protected getIntervalDelta() {
+            return this.interval + this.intervalDelta;
+        }
+    }
+}