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/*
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* Copyright 2018 the original author or authors.
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
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* applicable law or agreed to in writing, software distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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* OF ANY KIND, either express or implied. See the License for the specific
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* language governing permissions and limitations under the License.
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*/
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package com.github.drinkjava2.frog.egg;
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public class CellGroup {
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}
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/* Copyright 2018-2020 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
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* applicable law or agreed to in writing, software distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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* OF ANY KIND, either express or implied. See the License for the specific
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* language governing permissions and limitations under the License.
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*/
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package com.github.drinkjava2.frog.util;
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import java.util.Random;
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import com.github.drinkjava2.frog.brain.Zone;
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/**
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* Random Utilities used in this project
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*
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* @author Yong Zhu
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* @since 1.0
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*/
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public class RandomUtils {
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private static final Random rand = new Random();
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public static int nextInt(int i) {
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return rand.nextInt(i);
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}
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public static float nextFloat() {
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return rand.nextFloat();
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}
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public static Zone randomPosInZone(Zone z) {
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return new Zone(z.x - z.r + z.r * 2 * rand.nextFloat(), z.y - z.r + z.r * 2 * rand.nextFloat(),
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z.r * rand.nextFloat() * .02f);
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}
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public static boolean percent(int percent) {
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return rand.nextInt(100) < percent;
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}
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public static float vary(float f) { // 大部分时候不变,有极小机会变异,有极极小机会大变异,有极极极小机会大大大变异
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int i = rand.nextInt(100);
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if (i < 95)
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return f;
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float rate = .05f;
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if (i > 97)
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rate = .1f;
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return (float) (f * ((1 - rate) + rand.nextFloat() * rate * 2));
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}
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}
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