interval delta

artemis/pom.xml

@@ -13,15 +13,6 @@
 	<description>Fork of Artemis Entity System Framework.</description>
 	<url>https://github.com/junkdog/artemis-odb</url>
 
-	<dependencies>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<version>4.11</version>
-			<scope>test</scope>
-		</dependency>
-	</dependencies>
-
 	<build>
 		<plugins>
 			<plugin>

artemis/src/main/java/com/artemis/EntityEdit.java

@@ -16,6 +16,11 @@ public final class EntityEdit {
 		componentBits = new BitSet();
 	}
 
+	/**
+	 * Delete the entity from the world. The entity is considered to be 
+	 * in a final state once invoked; adding or removing components from an
+	 * entity scheduled for deletion will likely throw exceptions.
+	 */
 	public void deleteEntity() {
 		scheduledDeletion = true;
 	}

artemis/src/main/java/com/artemis/systems/IntervalEntitySystem.java

@@ -19,6 +19,7 @@ public abstract class IntervalEntitySystem extends EntitySystem {
 	/** How long to wait between updates. */
 	private final float interval;
 
+	private float intervalDelta;
 
 	/**
 	 * Creates a new IntervalEntitySystem.
@@ -38,11 +39,22 @@ protected boolean checkProcessing() {
 		acc += getTimeDelta();
 		if(acc >= interval) {
 			acc -= interval;
+			intervalDelta = (acc - intervalDelta);
+
 			return true;
 		}
 		return false;
 	}
 
+	/**
+	 * Gets the actual delta since this system was last processed.
+	 * 
+	 * @return Time passed since last process round.
+	 */
+	protected float getIntervalDelta() {
+		return interval + intervalDelta;
+	}
+
 	protected float getTimeDelta() {
 		return world.getDelta();
 	}

artemis/src/test/java/com/artemis/systems/IntervalEntitySystemTest.java

@@ -0,0 +1,46 @@
+package com.artemis.systems;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.artemis.Aspect;
+import com.artemis.Entity;
+import com.artemis.World;
+import com.artemis.component.ComponentX;
+import com.artemis.utils.ImmutableBag;
+
+@SuppressWarnings("static-method")
+public class IntervalEntitySystemTest {
+
+	private static final float ACC = 0.0001f;
+
+	@Test
+	public void test_interval_delta() {
+
+		World world = new World();
+		IntervalSystem es = world.setSystem(new IntervalSystem());
+		world.initialize();
+
+		world.delta = 1.1f;
+		world.process();
+		assertEquals(1.1, es.getIntervalDelta(), ACC);
+
+		world.delta = 0.95f;
+		world.process();
+		assertEquals(0.95, es.getIntervalDelta(), ACC);
+	}
+
+	private static class IntervalSystem extends IntervalEntitySystem {
+
+		@SuppressWarnings("unchecked")
+		public IntervalSystem() {
+			super(Aspect.getAspectForAll(ComponentX.class), 1);
+		}
+
+		@Override
+		protected void processEntities(ImmutableBag<Entity> entities) {
+
+		}
+	}
+}

pom.xml

@@ -19,6 +19,8 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<asm.version>4.1</asm.version>
+		<junit.version>4.11</junit.version>
+		<gwt.version>2.6.0</gwt.version>
 	</properties>
 
 	<scm>
@@ -51,7 +53,7 @@
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
-			<version>4.11</version>
+			<version>${junit.version}</version>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>