Android Open Source - Schooner-3D Line

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 Dan Mercer/* ww  w .  java  2s .co 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.supermercerbros.gameengine.collision;

import com.supermercerbros.gameengine.util.Utils;

/**
 * Represents a Line defined by two points, known as the "head" and "tail". 
 */
public class Line {
  final Point head, tail;
  /**
   * The <b>unit</b> vector of this Line's direction
   */
  final Vector vector;
  final float length;

  public Line(Point head, Point tail) {
    this.head = head;
    this.tail = tail;
    this.length = Utils.pythagF(head.x - tail.x, head.y - tail.y, head.z
        - tail.z);
    this.vector = new Vector(tail, head, 1.0f);
  }

  /**
   * @return The <b>non-unit</b> vector of this Line's direction.
   */
  public Vector asVector() {
    return new Vector(tail, head, 0.0f);
  }

  /**
   * Projects point <code>p</code> onto this Line.
   * @param p
   * @return The point on this Line closest to <code>p</code>.
   */
  public Point projectPoint(Point p) {
    float scl = vector.cos(new Vector(tail, p, 1.0f));
    return new Point(tail.x + (head.x - tail.x) * scl, tail.y + (head.y - tail.y) * scl, tail.z + (head.z - tail.z) * scl);
  }
  
  @Override
  public String toString() {
    return "Line{" + tail + ", " + head + "}";
  }
}

Java Source Code List

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