Include a second knife swing animation for the combo attack

Co-authored-by: r3cp3ct <45179536+r3cp3ct@users.noreply.github.com>
Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/objects/weapons/KnifeSwing2.java

@@ -0,0 +1,69 @@
+package sig.objects.weapons;
+
+import sig.engine.AnimatedSprite;
+import sig.engine.Panel;
+import sig.engine.Transform;
+import sig.objects.actor.AttachableObject;
+import sig.objects.actor.PhysicsObject;
+import sig.objects.actor.State;
+import sig.engine.objects.AnimatedObject;
+import sig.engine.objects.Object;
+
+public class KnifeSwing2 extends AttachableObject{
+
+    final byte frameCount = 5; //Number of frames before animation ends.
+
+    public KnifeSwing2(AnimatedSprite spr, double animationSpd, Panel panel, Object attachedObj) {
+        super(spr, animationSpd, panel, attachedObj);
+    }
+
+    @Override
+    public void update(double updateMult) {
+        super.update(updateMult);
+        if (getCurrentFrame()>frameCount) {
+            setMarkedForDeletion(true);
+            return;
+        }
+        if (getSpriteTransform()==Transform.HORIZONTAL) {
+            setX(getAttachedObject().getX()+getAnimatedSpr().getWidth()/2);
+        } else {
+            setX(getAttachedObject().getX()-getAnimatedSpr().getWidth()/2);
+        }
+        setY(getAttachedObject().getY());
+    }
+
+    @Override
+    public void collisionEvent(AnimatedObject obj) {
+        //System.out.println("Bonk");
+        if(obj instanceof PhysicsObject){
+            PhysicsObject pobj = (PhysicsObject)obj;
+            if(pobj.state!=State.STAGGER){
+                if(getSpriteTransform()==Transform.NONE){
+                    pobj.staggerDuration=0.3;
+                    pobj.x_velocity = -500;
+                    pobj.y_velocity = -300;
+                    pobj.state = State.STAGGER;
+                }else{
+                    pobj.staggerDuration=0.3;
+                    pobj.x_velocity = 500;
+                    pobj.y_velocity = -300;
+                    pobj.state = State.STAGGER;
+                }
+            }
+        }
+    }
+
+    @Override
+    public void draw(byte[] p) {
+    }
+
+    @Override
+    public Transform getSpriteTransform() {
+        return getAttached().getSpriteTransform();
+    }
+
+    @Override
+    public boolean isFriendlyObject() {
+        return true;
+    }    
+}