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43 lines
1.6 KiB
Java
43 lines
1.6 KiB
Java
/*
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* JSweet - http://www.jsweet.org
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* Copyright (C) 2015 CINCHEO SAS <renaud.pawlak@cincheo.fr>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package source.blocksgame.util;
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import jsweet.lang.Math;
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public class Collisions {
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// see http://williamecraver.wix.com/elastic-equations
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public static void sphericCollision(MobileElement refMobile, MobileElement targetMobile) {
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double th1 = refMobile.speedVector.angle();
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double th2 = targetMobile.speedVector.angle();
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double v1 = refMobile.speedVector.length();
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double v2 = targetMobile.speedVector.length();
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double m1 = refMobile.weight;
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double m2 = targetMobile.weight;
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Vector r_per = targetMobile.getPosition().to(refMobile.getPosition());
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double phi = r_per.angle();
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double a2 = (v2 * Math.cos(th2 - phi) * (m2 - m1) + 2 * m1 * v1 * Math.cos(th1 - phi)) / (m1 + m2);
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double b2 = v2 * Math.sin(th2 - phi);
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targetMobile.speedVector.x = a2 * Math.cos(phi) + b2 * Math.cos(phi + Math.PI / 2);
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targetMobile.speedVector.y = a2 * Math.sin(phi) + b2 * Math.sin(phi + Math.PI / 2);
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}
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}
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