Android Open Source - unknown-pleasures Strech Original Cover Animator

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The source code is released under:

Creative Commons Attribution NonCommercial NoDerivs (CC-NC-ND) THE WORK (AS DEFINED BELOW) IS PROVIDED UNDER THE TERMS OF THIS CREATIVE COMMONS PUBLIC LICENSE ("CCPL" OR "LICENSE"). THE WORK IS PROTE...

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Java Source Code

/**
 * StrechOriginalCoverAnimator.java//from w  w  w .j av a  2  s . c  o  m
 * Author: marek.brodziak@gmail.com
 * Created: Jun 2, 2014
 * Copyright 2014 by miniti
 */

package pl.miniti.android.pleasures.animation;

import java.util.ArrayList;
import java.util.List;

import android.graphics.Matrix;
import android.graphics.Path;

/**
 * Horizontal strech of the album cover
 */
public class StrechOriginalCoverAnimator implements Animator {

  /**
   * Controls streching speed
   */
  protected static final float DIFF = .01f;

  /**
   * Out of 2f the begining of the magnified part of the animation
   */
  protected static final float MIN = .7f;

  /**
   * Out of 2f the end of the magnified part of the animation
   */
  protected static final float MAX = 1.3f;

  /**
   * Collection of currently available paths
   */
  protected List<Path> paths = new ArrayList<Path>();

  /**
   * Phase of the animation
   */
  protected float phase = 1f;

  /**
   * Translation matrix for the current phase
   */
  protected Matrix phaseMatrix = new Matrix();

  /**
   * Current strech value: positive or negative depending on the animation
   * phase
   */
  protected float diff = DIFF;

  /**
   * No-arg default constructor
   */
  public StrechOriginalCoverAnimator() {
    paths = OriginalCover.paths(1 - MIN);
    phaseMatrix.setScale(1f, 1f, .5f, 0f);
  }

  /*
   * (non-Javadoc)
   * 
   * @see pl.miniti.android.pleasures.animation.Animator#of(int)
   */
  @Override
  public Path of(int line, int of) {
    Path copy = new Path(paths.get(line));
    copy.transform(phaseMatrix);
    return copy;
  }

  /*
   * (non-Javadoc)
   * 
   * @see pl.miniti.android.pleasures.animation.Animator#frame()
   */
  @Override
  public void frame() {
    phase += diff;
    if (phase >= MAX || phase <= MIN) {
      diff = -diff;
    }
    phaseMatrix.setScale(phase, 1f, .5f, 0f);
  }

}

Java Source Code List