add star approach circle

src/yugecin/opsudance/Dancer.java

@@ -69,6 +69,7 @@ public class Dancer {
 		new ApproachCircleSpinner(),
 		new SpiralSpinner(),
 		new FivePointStarSpinner(),
+		new FivePointStarApproachSpinner(),
 	};
 
 	public static SliderMoverController[] sliderMovers = new SliderMoverController[] {

src/yugecin/opsudance/spinners/FivePointStarApproachSpinner.java

@@ -0,0 +1,56 @@
+/*
+ * opsu!dance - fork of opsu! with cursordance auto
+ * Copyright (C) 2016 yugecin
+ *
+ * opsu!dance is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * opsu!dance is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with opsu!dance.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package yugecin.opsudance.spinners;
+
+import itdelatrisu.opsu.Options;
+
+public class FivePointStarApproachSpinner extends Spinner {
+
+	final double angleIncRads = Math.PI * 36d / 180d;
+	double ang;
+	final double[] point = new double[2];
+	boolean odd;
+
+	@Override
+	public void init() {
+		ang = -Math.PI / 2d;
+		odd = true;
+	}
+
+	@Override
+	public double[] getPoint() {
+		if (waitForDelay()) {
+			ang += angleIncRads;
+			odd = !odd;
+		}
+
+		double rad = Options.width / 4.0f * (1d - Spinner.PROGRESS);
+		if (!odd) {
+			rad /= 3d;
+		}
+		point[0] = Options.width / 2d + Math.cos(ang) * rad;
+		point[1] = Options.height / 2d + Math.sin(ang) * rad;
+		return point;
+	}
+
+	@Override
+	public String toString() {
+		return "5-point approach star";
+	}
+
+}