It looks better now

src/awlex/ospu/polymover/ArcMover.java

@@ -1,7 +1,10 @@
 package awlex.ospu.polymover;
 
 import Jama.Matrix;
+import itdelatrisu.opsu.objects.Circle;
 import itdelatrisu.opsu.objects.GameObject;
+import itdelatrisu.opsu.objects.Slider;
+import itdelatrisu.opsu.states.Game;
 
 import static java.lang.Math.*;
 
@@ -36,17 +39,39 @@ public class ArcMover extends PolyMover {
 		alpha = atan2(p1.end.y - ym, p1.end.x - xm);
 		beta = atan2(middle.end.y - ym, middle.end.x - xm);
 		gamma = atan2(p2.start.y - ym, p2.start.x - xm);
+		//fixAngles();
+	}
+	
+	private void fixAngles() {
+		if (alpha < gamma && gamma < beta) {
+			gamma += 2 * PI;
+		}
+		else if ((beta < alpha && alpha < gamma)) {
+			beta += 2 * PI;
+			gamma += 2 * PI;
+		}
+		else if (beta < gamma && gamma < alpha) {
+			alpha -= 2 * PI;
+		}
+		else if (gamma < alpha && alpha < beta) {
+			alpha -= 2 * PI;
+		}
 	}
 	
 	@Override
 	public double[] getPointAt(int time) {
 		double angle;
+		double percent;
 		if (time < middle.getTime()) {
-			angle = alpha + beta * ((double) time - p1.getEndTime()) / ((middle.getTime() - p1.getEndTime()));
+			percent = ((double) time - p1.getEndTime()) / (middle.getTime() - p1.getEndTime());
+			angle = alpha + (beta - alpha) * percent;
 		}
 		else {
-			angle = beta + gamma * ((double) time - middle.getTime()) / (p2.getTime() - middle.getTime());
+			percent = ((double) time - middle.getTime()) / (p2.getTime() - middle.getTime());
+			angle = beta + (gamma - beta) * percent;
 		}
+		if (angle > PI)
+			angle -= PI;
 		return new double[]{
 			xm + r * cos(angle),
 			ym + r * sin(angle)
@@ -63,16 +88,32 @@ public class ArcMover extends PolyMover {
 	}
 	
 	private static Matrix prepareMatrix(GameObject p1, GameObject middle, GameObject p2) {
-		Matrix a = new Matrix(new double[][]{
+		Matrix a, b;
+		if (p2.isSlider()) {
+			Circle c = (((Slider) p2).getTickPositionCircles()[0]);
+			a = new Matrix(new double[][]{
 				{1, -p1.end.x, -p1.end.y},
-			{1, -middle.end.x, -middle.end.y},
+				{1, -middle.start.x, -middle.start.y},
+				{1, -c.end.x, -c.end.y}
+			});
+			b = new Matrix(new double[][]{
+				{-(pow(p1.end.x, 2) + pow(p1.end.y, 2))},
+				{-(pow(middle.start.x, 2) + pow(middle.start.y, 2))},
+				{-(pow(c.end.x, 2) + pow(c.end.y, 2))},
+			});
+		}
+		else {
+			a = new Matrix(new double[][]{
+				{1, -p1.end.x, -p1.end.y},
+				{1, -middle.start.x, -middle.start.y},
 				{1, -p2.start.x, -p2.start.y}
 			});
-		Matrix b = new Matrix(new double[][]{
+			b = new Matrix(new double[][]{
 				{-(pow(p1.end.x, 2) + pow(p1.end.y, 2))},
-			{-(pow(middle.end.x, 2) + pow(middle.end.y, 2))},
+				{-(pow(middle.start.x, 2) + pow(middle.start.y, 2))},
 				{-(pow(p2.start.x, 2) + pow(p2.start.y, 2))},
 			});
+		}
 		
 		return a.solve(b);
 	}

src/awlex/ospu/polymover/LineMover.java

@@ -9,7 +9,7 @@ import yugecin.opsudance.movers.LinearMover;
  */
 public class LineMover extends PolyMover {
 	
-	GameObject[] objects;
+	private GameObject[] objects;
 	
 	public LineMover(GameObject[] objects, int startIndex, int count) {
 		this.objects = new GameObject[count];
@@ -27,6 +27,6 @@ public class LineMover extends PolyMover {
 	
 	@Override
 	public GameObject[] getItems() {
-		return new GameObject[0];
+		return objects;
 	}
 }

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

@@ -3,6 +3,7 @@ package awlex.ospu.polymover.factory;
 import awlex.ospu.polymover.ArcMover;
 import awlex.ospu.polymover.LineMover;
 import awlex.ospu.polymover.PolyMover;
+import itdelatrisu.opsu.objects.DummyObject;
 import itdelatrisu.opsu.objects.GameObject;
 
 /**
@@ -17,6 +18,8 @@ public class ArcFactory implements PolyMoverFactory {
 	public double[] getPointAt(int time) {
 		if (previous == null) {
 			return current.getPointAt(time);
+		} else if (current == null) {
+			return previous.getPointAt(time);
 		}
 		
 		double[] point1 = current.getPointAt(time);
@@ -32,24 +35,42 @@ public class ArcFactory implements PolyMoverFactory {
 	public void init(GameObject[] objects, int startIndex) {
 		if (objects == null)
 			throw new NullPointerException("Objects musn't be null");
-		
+		boolean b;
+		if (b = startIndex == -1) {
+			objects = new GameObject[]{
+				new DummyObject(),
+				objects[0],
+				objects[1]
+			};
+			startIndex++;
+		}
 		GameObject middle = objects[startIndex + 1];
 		if (middle.isSlider() || middle.isSpinner() || !ArcMover.canCricleExistBetweenItems(objects[startIndex], middle, objects[startIndex + 2]))
 			current = new LineMover(objects, startIndex, 3);
 		else
 			current = new ArcMover(objects[startIndex], middle, objects[startIndex + 2]);
 		lastIndex = startIndex + 2;
+		if (b)
+			lastIndex--;
 		previous = null;
 	}
 	
 	public void update(GameObject p) {
-		GameObject[] items = (previous == null ? current : previous).getItems();
+		GameObject[] items = current.getItems();
+		System.out.println(items.length);
 		GameObject last = items[items.length - 1];
 		if (last != p) {
-			if (ArcMover.canCricleExistBetweenItems(items[items.length - 2], items[items.length - 1], p)) {
 			previous = current;
+			if (!(last.isSpinner() || last.isSlider()))
+				if (ArcMover.canCricleExistBetweenItems(items[items.length - 2], last, p)) {
 					current = new ArcMover(previous, p);
 				}
+				else {
+					current = new LineMover(items, 0, items.length);
+				}
+			else {
+				current = null;
+			}
 		}
 		lastIndex++;
 	}

src/yugecin/opsudance/Dancer.java

@@ -266,10 +266,11 @@ public class Dancer {
 				double[] spinnerStartPoint = spinner.getPoint();
 				c.start = new Vec2f((float) spinnerStartPoint[0], (float) spinnerStartPoint[1]);
 			}
-			
+			//	polyMoverFactory.init(gameObjects, objectIndex);
 			if (polyMoverFactory.isInitialized() && polyMoverFactory.getLatestIndex() < objectIndex + polyMoverFactory.getPrefferedBufferSize() - 1) {
-				polyMoverFactory.update(gameObjects[polyMoverFactory.getPrefferedBufferSize() - 1]);
-			} else {
+				polyMoverFactory.update(gameObjects[polyMoverFactory.getLatestIndex()]);
+			}
+			else {
 				polyMoverFactory.init(gameObjects, objectIndex);
 			}
 		}