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history/003b_simple/src/main/java/com/github/drinkjava2/frog/util/RandomUtils.java

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+/* Copyright 2018-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.github.drinkjava2.frog.util;
+
+import java.util.Random;
+
+import com.github.drinkjava2.frog.Frog;
+import com.github.drinkjava2.frog.brain.Zone;
+import com.github.drinkjava2.frog.egg.Egg;
+
+/**
+ * Random Utilities used in this project
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+public class RandomUtils {
+	private static final Random rand = new Random();
+
+	public static int nextInt(int i) {
+		return rand.nextInt(i);
+	}
+
+	public static float nextFloat() {
+		return rand.nextFloat();
+	}
+
+	/** Return a random zone inside of a zone */
+	public static Zone randomZoneInZone(Zone z) { // 在一个区内随机取一个小小区
+		return new Zone(z.x - z.r + z.r * 2 * rand.nextFloat(), z.y - z.r + z.r * 2 * rand.nextFloat(),
+				z.r * rand.nextFloat() * .04f);
+	}
+
+	/** Return a random zone inside of frog's random organ */
+	public static Zone randomPosInAnyFrogOrgan(Frog f) {
+		if (f.organs == null || f.organs.size() == 0)
+			throw new IllegalArgumentException("Can not call randomPosInRandomOrgan method when frog has no organ");
+		return randomZoneInZone(f.organs.get(RandomUtils.nextInt(Egg.FIXED_ORGAN_QTY)));
+	}
+
+	/** Return a random zone inside of frog's random organ */
+	public static Zone randomPosMostInNewEye(Frog f) {
+		if (f.organs == null || f.organs.size() == 0)
+			throw new IllegalArgumentException("Can not call randomPosInRandomOrgan method when frog has no organ");
+		if (RandomUtils.percent(95))
+			return randomZoneInZone(f.organs.get(7));// 这是一个硬编码，大部分新联接建立在newEye中
+		return randomZoneInZone(f.organs.get(RandomUtils.nextInt(Egg.FIXED_ORGAN_QTY)));
+	}
+
+	public static boolean percent(float percent) {
+		return rand.nextFloat() * 100 < percent;
+	}
+
+	public static int vary(int v) {// 随机有大概率小变异，小概率大变异，极小概率极大变异
+		if (percent(40))
+			v += v * .04 * (nextFloat() - 0.5); // v=v+-.04
+		if (percent(10))
+			v += v * .103 * (nextFloat() - 0.5); // v=v+-0.1
+		else if (percent(5))
+			v += v * 1 * (nextFloat() - 0.5); // v=v+-0.4
+		else if (percent(2))
+			v += v * 4 * (nextFloat() - 0.5); // v=v+-2
+		else if (percent(1f))
+			v += v * 8 * (nextFloat() - 0.5); // v=v+-6
+		return v;
+	}
+
+	public static float vary(float v) {// 随机有大概率小变异，小概率大变异，极小概率极大变异
+		if (percent(40))
+			v += v * .04 * (nextFloat() - 0.5); // v=v+-.04
+		if (percent(10))
+			v += v * .103 * (nextFloat() - 0.5); // v=v+-0.1
+		else if (percent(5))
+			v += v * 1 * (nextFloat() - 0.5); // v=v+-0.4
+		else if (percent(2))
+			v += v * 4 * (nextFloat() - 0.5); // v=v+-2
+		else if (percent(1f))
+			v += v * 8 * (nextFloat() - 0.5); // v=v+-6
+		return v;
+	}
+
+	public static int varyInLimit(int v, int from, int to) {// 让返回值在from和to之间随机变异
+		int i = vary(v);
+		if (i < from)
+			i = from;
+		if (i > to)
+			i = to;
+		return i;
+	}
+
+	public static float varyInLimit(float v, float from, float to) {// 让返回值在from和to之间随机变异
+		float i = vary(v);
+		if (i < from)
+			i = from;
+		if (i > to)
+			i = to;
+		return i;
+	}
+
+}