add movers

src/yugecin/opsudance/movers/QuartCircleMover.java

@@ -0,0 +1,57 @@
+/*
+ * 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! 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.movers;
+
+import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.objects.GameObject;
+
+public class QuartCircleMover extends Mover {
+
+	private double middlex;
+	private double middley;
+	private double radius;
+	private double ang;
+
+	public QuartCircleMover(GameObject start, GameObject end, int dir) {
+		super(start, end, dir);
+		middlex = (startX - endX) / 2d;
+		middley = (startY - endY) / 2d;
+		radius = Utils.distance(middlex, middley, startX, startY);
+		ang = Math.atan2(startY - middley, startX - middlex) + Math.PI / 2d * dir;
+		middlex = middlex + Math.cos(ang) * radius;
+		middley = middley + Math.sin(ang) * radius;
+		radius = Utils.distance(middlex, middley, startX, startY);
+		ang = Math.atan2(startY - middley, startX - middlex);
+	}
+
+	@Override
+	public double[] getPointAt(int time) {
+		double ang = this.ang - Math.PI / 2d * getT(time) * dir;
+
+		return new double[] {
+			middlex + Math.cos(ang) * radius,
+			middlex + Math.sin(ang) * radius
+		};
+	}
+
+	@Override
+	public String getName() {
+		return "1/4th circle";
+	}
+
+}