Android Open Source - DolphinOES Positions

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The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2015 See AUTHORS file./*  w  ww .ja  v  a  2 s  .  c  o  m*/
 * 
 * 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.sidereal.dolphinoes.architecture.pos;

import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;

/** Conveniance method for retrieving data between multiple {@link Position}
 * objects. All methods are static. Methods appended with a '2' are in 
 * 2D space, and methods appended with a '3' are in 3D space
 * 
 * @author Claudiu
 *
 */
public class Positions
{
  public static float getDist2(Position p1 , Position p2)
  {
    final float x = p2.getX() - p1.getX();
    final float y = p2.getY() - p1.getY();
    return (float)Math.sqrt(x * x + y * y);
  }
  
  public static float getDist3(Position p1, Position p2)
  {
    final float x = p2.getX() - p1.getX();
    final float y = p2.getY() - p1.getY();
    final float z = p2.getZ() - p1.getZ();
    return (float)Math.sqrt(x * x + y * y + z * z);
  }
  
  public static Vector2 getTrajectory2(Position p1, Position p2)
  {
    double angle = Math.atan2(p1.getY() - p2.getY(),
        p1.getX() - p2.getX());

    float trajX = (float) Math.sin(angle);
    float trajY = (float) Math.sin(angle);

    return new Vector2(trajX, trajY);
  }
  
  public static double getAngle2(Position p1, Position p2)
  {
    float crossProd = p1.getX() * p2.getY() - p1.getY() * p2.getX();
    float dot = p1.getX() * p2.getX() + p1.getY() * p2.getY();
    return (float)Math.atan2(crossProd, dot) * MathUtils.radiansToDegrees;
  }
  
  
}

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