attempt to improve the fpsmeter

src/yugecin/opsudance/utils/FPSMeter.java

@@ -0,0 +1,52 @@
+/*
+ * opsu!dance - fork of opsu! with cursordance auto
+ * Copyright (C) 2017 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.utils;
+
+public class FPSMeter {
+
+	private final int targetTimeBetweenUpdates;
+
+	private int[] measurements;
+	private int timeBetweenUpdates;
+	private int currentMeasureIndex;
+
+	public FPSMeter(int measurements) {
+		targetTimeBetweenUpdates = 1000 / measurements;
+		this.measurements = new int[measurements];
+	}
+
+	public void update(int delta) {
+		timeBetweenUpdates += delta;
+		while (timeBetweenUpdates >= targetTimeBetweenUpdates) {
+			timeBetweenUpdates -= targetTimeBetweenUpdates;
+			measurements[currentMeasureIndex] = 0;
+			currentMeasureIndex = ++currentMeasureIndex % measurements.length;
+		}
+		for (int i = 0; i < measurements.length; i++) {
+			if (i == currentMeasureIndex) {
+				continue;
+			}
+			measurements[i]++;
+		}
+	}
+
+	public int getValue() {
+		return measurements[currentMeasureIndex];
+	}
+
+}