The model is now working and downwards compatible

src/awlex/ospu/polymover/ArcMover.java

@@ -21,7 +21,6 @@ public class ArcMover implements PolyMover {
 		this.middle = middle;
 		this.p2 = p2;
 		init();
-		System.out.println("r: " + r + " xm: " + xm + " ym: " + ym);
 	}
 	
 	private void init() {
@@ -99,4 +98,9 @@ public class ArcMover implements PolyMover {
 		}
 		return true;
 	}
+
+	@Override
+	public GameObject getLastItem() {
+		return p2;
+	}
 }

src/awlex/ospu/polymover/LineMover.java

@@ -41,4 +41,15 @@ public class LineMover implements PolyMover {
 		return objects;
 	}
 
+	@Override
+	public GameObject getLastItem() {
+		int i = objects.length - 1;
+		while (i > 0) {
+			if (objects[i] != null) {
+				break;
+			}
+			i--;
+		}
+		return objects[i];
+	}
 }

src/awlex/ospu/polymover/PolyMover.java

@@ -10,4 +10,6 @@ public interface PolyMover {
 	double[] getPointAt(int time);
 
 	GameObject[] getItems();
+
+	GameObject getLastItem();
 }

src/awlex/ospu/polymover/factory/ArcFactory.java

@@ -16,8 +16,7 @@ public class ArcFactory extends PolyMoverFactory {
 	private static final int PREFFERED_BUFFER_SIZE = 3;
 
 	public void init(GameObject[] objects, int count) {
-		System.out.println("count: " + count);
-		if (count < 3 || !ArcMover.canCricleExistBetweenItems(objects[0], objects[1], objects[2]))
+		if (count < 3 || (!ArcMover.canCricleExistBetweenItems(objects[0], objects[1], objects[2])))
 			addMover(new LineMover(objects, 3));
 		else
 			addMover(new ArcMover(objects[0], objects[1], objects[2]));
@@ -30,7 +29,7 @@ public class ArcFactory extends PolyMoverFactory {
 
 	@Override
 	public int getMinBufferSize() {
-		return ArcMover.ITEMS_NEEDED;
+		return LineMover.ITEMS_NEEDED;
 	}
 
 	@Override

src/awlex/ospu/polymover/factory/PolyMoverFactory.java

@@ -4,7 +4,9 @@ import awlex.ospu.polymover.LineMover;
 import awlex.ospu.polymover.PolyMover;
 import itdelatrisu.opsu.objects.DummyObject;
 import itdelatrisu.opsu.objects.GameObject;
+import yugecin.opsudance.Dancer;
 
+import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -28,8 +30,7 @@ public abstract class PolyMoverFactory {
 		double[] ret = new double[2];
 		int i = 0;
 		while (i < movers.size()) {
-			GameObject[] items = movers.get(i).getItems();
-			if (items[items.length - 1].getEndTime() < time)
+			if (movers.get(i).getLastItem().getEndTime() < time)
 				break;
 			double[] point = movers.get(i).getPointAt(time);
 			ret[0] += point[0];
@@ -47,17 +48,16 @@ public abstract class PolyMoverFactory {
 		}
 		GameObject[] items = new GameObject[getMaxBufferSize()];
 		int i = 1;
-		items[0] = startIndex == -1 ? new DummyObject() : objects[startIndex];
-		while (i < items.length - 2) {
+		items[0] = startIndex == -1 ? Dancer.d : objects[startIndex];
+		while (i < items.length - 1) {
 			GameObject g = objects[startIndex + i];
 			if (g.isSlider() || g.isSpinner())
 				break;
 			items[i++] = g;
 		}
 		items[i] = objects[startIndex + i];
-		i++;
 		latestIndex = startIndex + getMaxBufferSize() + i - items.length;
-		if (i >= getMinBufferSize()) {
+		if (++i >= getMinBufferSize()) {
 			init(items, i);
 		}
 		else {

src/yugecin/opsudance/Dancer.java

@@ -250,6 +250,7 @@ public class Dancer {
 					c.start.set((float) spinnerStartPoint[0], (float) spinnerStartPoint[1]);
 				}
 			}
+
 			isCurrentLazySlider = false;
 			// detect lazy sliders, should work pretty good
 			if (c.isSlider() && LAZY_SLIDERS && Utils.distance(c.start.x, c.start.y, c.end.x, c.end.y) <= Circle.diameter * 0.8f) {
@@ -275,7 +276,6 @@ public class Dancer {
 				polyMoverFactory.create(gameObjects, objectIndex - 1);
 			}
 		}
-
 		if (time < c.getTime()) {
 			if (!(p.isSpinner() || c.isSpinner())) {
 				double[] point = polyMoverFactory.getPointAt(time);