diff --git a/bin/.gitignore b/bin/.gitignore
index cf1db2e..5fafa5c 100644
--- a/bin/.gitignore
+++ b/bin/.gitignore
@@ -1 +1,2 @@
 /org/
+/tests/
diff --git a/src/org/ntlab/actions/AbstractViewerAction.java b/src/org/ntlab/actions/AbstractViewerAction.java
new file mode 100644
index 0000000..5446ada
--- /dev/null
+++ b/src/org/ntlab/actions/AbstractViewerAction.java
@@ -0,0 +1,17 @@
+package org.ntlab.actions;
+
+import javax.swing.AbstractAction;
+import javax.swing.Icon;
+
+import org.ntlab.deltaViewer.MagnetRONViewer;
+
+public abstract class AbstractViewerAction extends AbstractAction {
+
+	protected MagnetRONViewer viewer;
+
+	public AbstractViewerAction(String name, MagnetRONViewer viewer) {
+		super(name);
+		this.viewer = viewer;
+	}
+
+}
\ No newline at end of file
diff --git a/src/org/ntlab/actions/ZoomActualAction.java b/src/org/ntlab/actions/ZoomActualAction.java
new file mode 100644
index 0000000..2d8ca2b
--- /dev/null
+++ b/src/org/ntlab/actions/ZoomActualAction.java
@@ -0,0 +1,17 @@
+package org.ntlab.actions;
+
+import java.awt.event.ActionEvent;
+
+import org.ntlab.deltaViewer.MagnetRONViewer;
+
+public class ZoomActualAction extends AbstractViewerAction {
+	public ZoomActualAction(MagnetRONViewer viewer) {
+		super("100%", viewer);
+	}
+
+	@Override
+	public void actionPerformed(ActionEvent arg0) {
+		viewer.getGraphComponent().zoomActual();
+	}
+
+}
diff --git a/src/org/ntlab/actions/ZoomInAction.java b/src/org/ntlab/actions/ZoomInAction.java
new file mode 100644
index 0000000..e8c9e83
--- /dev/null
+++ b/src/org/ntlab/actions/ZoomInAction.java
@@ -0,0 +1,17 @@
+package org.ntlab.actions;
+
+import java.awt.event.ActionEvent;
+
+import org.ntlab.deltaViewer.MagnetRONViewer;
+
+public class ZoomInAction extends AbstractViewerAction {
+	public ZoomInAction(MagnetRONViewer viewer) {
+		super("�g��", viewer);
+	}
+
+	@Override
+	public void actionPerformed(ActionEvent arg0) {
+		viewer.getGraphComponent().zoomIn();
+	}
+
+}
diff --git a/src/org/ntlab/actions/ZoomOutAction.java b/src/org/ntlab/actions/ZoomOutAction.java
new file mode 100644
index 0000000..ddd5b85
--- /dev/null
+++ b/src/org/ntlab/actions/ZoomOutAction.java
@@ -0,0 +1,17 @@
+package org.ntlab.actions;
+
+import java.awt.event.ActionEvent;
+
+import org.ntlab.deltaViewer.MagnetRONViewer;
+
+public class ZoomOutAction extends AbstractViewerAction {
+	public ZoomOutAction(MagnetRONViewer viewer) {
+		super("�k��", viewer);
+	}
+
+	@Override
+	public void actionPerformed(ActionEvent arg0) {
+		viewer.getGraphComponent().zoomOut();
+	}
+
+}
diff --git a/src/org/ntlab/deltaViewer/MagnetRONFrame.java b/src/org/ntlab/deltaViewer/MagnetRONFrame.java
index ea290a2..185abdd 100644
--- a/src/org/ntlab/deltaViewer/MagnetRONFrame.java
+++ b/src/org/ntlab/deltaViewer/MagnetRONFrame.java
@@ -56,6 +56,10 @@
 
 		pack();
 	}
+	
+	public MagnetRONViewer getViewer() {
+		return viewer;
+	}
 
 	public TraceJSON getTrace() {
 		return trace;
@@ -431,32 +435,35 @@
 
 	@Override
 	public void startAnimation() {
-		animationThread = new Thread() {
-			public void run() {	
-				// Build a frame, create a graph, and add the graph to the frame so you can actually see the graph.
-				if (objectCallGraph != null && aliasCollector != null) {
-					List<TracePoint> relatedPoints = objectCallGraph.getRelatedPoints();
-					TracePoint lastRP = relatedPoints.get(relatedPoints.size() - 1);
-					Map.Entry<Reference, String> rpInf = MagnetRONViewer.getRelatedInformation(lastRP);
-					WINDOW_TITLE = "extract delta of:" + rpInf.getKey().getSrcClassName() + "(" + rpInf.getKey().getSrcObjectId() + ")" + " -> " + rpInf.getKey().getDstClassName()+ "(" + rpInf.getKey().getDstObjectId()+ ")";
-					setTitle(WINDOW_TITLE);			
-					
-					viewer.init(objectCallGraph, aliasCollector, new CollaborationLayout());
-					List<Alias> aliasList = new ArrayList<>(aliasCollector.getAliasList());
-		
-//					dv.setCoordinatorPoint(1200, 100);
-					viewer.initAnimation();
-//					for(int i = 0; i < aliasList.size(); i++) {
-//						System.out.println(aliasList.get(i).getObjectId() + ", " + aliasList.get(i).getMethodSignature() + " l." + aliasList.get(i).getLineNo() + " : " + aliasList.get(i).getAliasType().toString());
-//					}
-					for (int i = 0; i <= aliasList.size(); i++) {
-						viewer.stepToAnimation(i);
+		if (animationThread != null) {
+			animationThread = new Thread() {
+				public void run() {	
+					// Build a frame, create a graph, and add the graph to the frame so you can actually see the graph.
+					if (objectCallGraph != null && aliasCollector != null) {
+						List<TracePoint> relatedPoints = objectCallGraph.getRelatedPoints();
+						TracePoint lastRP = relatedPoints.get(relatedPoints.size() - 1);
+						Map.Entry<Reference, String> rpInf = MagnetRONViewer.getRelatedInformation(lastRP);
+						WINDOW_TITLE = "extract delta of:" + rpInf.getKey().getSrcClassName() + "(" + rpInf.getKey().getSrcObjectId() + ")" + " -> " + rpInf.getKey().getDstClassName()+ "(" + rpInf.getKey().getDstObjectId()+ ")";
+						setTitle(WINDOW_TITLE);			
+						
+						viewer.init(objectCallGraph, aliasCollector, new CollaborationLayout());
+						List<Alias> aliasList = new ArrayList<>(aliasCollector.getAliasList());
+			
+//						dv.setCoordinatorPoint(1200, 100);
+						viewer.initAnimation();
+//						for(int i = 0; i < aliasList.size(); i++) {
+//							System.out.println(aliasList.get(i).getObjectId() + ", " + aliasList.get(i).getMethodSignature() + " l." + aliasList.get(i).getLineNo() + " : " + aliasList.get(i).getAliasType().toString());
+//						}
+						for (int i = 0; i <= aliasList.size(); i++) {
+							viewer.stepToAnimation(i);
+						}
+			
 					}
-		
+					animationThread = null;
 				}
-			}
-		};
-		animationThread.start();
+			};
+			animationThread.start();
+		}
 	}
 
 	@Override
@@ -469,7 +476,9 @@
 
 	@Override
 	public void stopAnimation() {
-		animationThread.stop();
+		if (animationThread != null) {
+			animationThread.stop();
+		}
 	}
 
 	public void startDeltaViewer(IObjectCallGraph ocg, IAliasCollector ac) {
diff --git a/src/org/ntlab/deltaViewer/MagnetRONMenuBar.java b/src/org/ntlab/deltaViewer/MagnetRONMenuBar.java
index 60d8845..83f370f 100644
--- a/src/org/ntlab/deltaViewer/MagnetRONMenuBar.java
+++ b/src/org/ntlab/deltaViewer/MagnetRONMenuBar.java
@@ -6,10 +6,13 @@
 import org.ntlab.actions.OpenAction;
 import org.ntlab.actions.StartAnimationAction;
 import org.ntlab.actions.StopAnimationAction;
+import org.ntlab.actions.ZoomInAction;
+import org.ntlab.actions.ZoomOutAction;
+import org.ntlab.actions.ZoomActualAction;
 
 public class MagnetRONMenuBar extends JMenuBar {
 
-	public MagnetRONMenuBar(IMagnetRON magnetRON) {
+	public MagnetRONMenuBar(MagnetRONFrame magnetRON) {
 		super();
 		JMenu fileMenu = add(new JMenu("�t�@�C��"));
 		fileMenu.add(new OpenAction(magnetRON));
@@ -19,6 +22,9 @@
 		JMenu animationSettingMenu = add(new JMenu("�A�j���[�V�����ݒ�"));
 		
 		JMenu viewMenu = add(new JMenu("�\��"));
+		viewMenu.add(new ZoomInAction(magnetRON.getViewer()));
+		viewMenu.add(new ZoomOutAction(magnetRON.getViewer()));
+		viewMenu.add(new ZoomActualAction(magnetRON.getViewer()));
 	
 		JMenu animationMenu = add(new JMenu("�A�j���[�V����"));
 		animationMenu.add(new StartAnimationAction(magnetRON));
diff --git a/src/org/ntlab/deltaViewer/MagnetRONViewer.java b/src/org/ntlab/deltaViewer/MagnetRONViewer.java
index be95f46..0339170 100644
--- a/src/org/ntlab/deltaViewer/MagnetRONViewer.java
+++ b/src/org/ntlab/deltaViewer/MagnetRONViewer.java
@@ -77,6 +77,10 @@
 		setLayout(new BorderLayout());
 		add(mxgraphComponent, BorderLayout.CENTER);
 	}
+	
+	public mxGraphComponent getGraphComponent() {
+		return mxgraphComponent;
+	}
 
 	abstract public void initAnimation();
 
@@ -653,7 +657,7 @@
 		}
 	}
 
-	abstract public void createMethodExecutionVertex(Alias alias);
+	abstract protected void createMethodExecutionVertex(Alias alias);
 
 	/**
 	 * Parent : Create MethodExecutionVertex.