Android Open Source - droidengine2d Transform

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The source code is released under:

Apache License

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Java Source Code

/*   Copyright 2013-2014 Miguel Vicente Linares
 */*from   w  ww.  ja  v a  2 s.com*/
 *  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.miviclin.droidengine2d.util;

import com.miviclin.droidengine2d.util.math.Vector2;

/**
 * Transform. It has position, scale, rotation...
 * 
 * @author Miguel Vicente Linares
 * 
 */
public class Transform {

  private Vector2 position;
  private Vector2 scale;
  private Vector2 origin;
  private float rotation;

  /**
   * Creates a new Transform with the specified position and scale.<br>
   * The default origin is (scale.getX() / 2, scale.getY() / 2).
   * 
   * @param position Position.
   * @param scale Scale.
   */
  public Transform(Vector2 position, Vector2 scale) {
    this(position, scale, new Vector2(scale.getX() / 2, scale.getY() / 2), 0.0f);
  }

  /**
   * Creates a new Transform with the specified position, scale, origin and rotation.
   * 
   * @param position Position.
   * @param scale Scale.
   * @param origin Origin (must be a point between (0, 0) and (scale.getX(), scale.getY())).
   * @param rotation Rotation angle.
   */
  public Transform(Vector2 position, Vector2 scale, Vector2 origin, float rotation) {
    super();
    checkNotNull(position, "position");
    checkNotNull(scale, "scale");
    checkNotNull(origin, "origin");
    this.position = position;
    this.scale = scale;
    this.origin = origin;
    this.rotation = rotation;
  }

  /**
   * Returns the rotation angle around the origin.
   * 
   * @return rotation angle
   */
  public float getRotation() {
    return rotation;
  }

  /**
   * Sets the rotation angle around the origin.
   * 
   * @param rotation Rotation angle.
   */
  public void setRotation(float rotation) {
    this.rotation = rotation;
  }

  /**
   * Returns the position.
   * 
   * @return position
   */
  public Vector2 getPosition() {
    return position;
  }

  /**
   * Returns the scale.
   * 
   * @return scale
   */
  public Vector2 getScale() {
    return scale;
  }

  /**
   * Returns the origin.
   * 
   * @return origin
   */
  public Vector2 getOrigin() {
    return origin;
  }

  /**
   * Checks if the specified Vector2 is not null. If it is null, throws an exception.
   * 
   * @param vector Vector2.
   * @param variableName Name of the Vector2 variable. This name will be used in the message of the exception.
   */
  private void checkNotNull(Vector2 vector, String variableName) {
    if (vector == null) {
      throw new IllegalArgumentException(variableName + " can not be null");
    }
  }

}

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