Android Open Source - AniDroid Custom Easing

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Back to project page AniDroid.

License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

/**********************************************************************
This class is a port of greensock's excellent customease class
http://www.greensock.com/customease//*from  w w  w. j  a v  a 2s. c o m*/
**********************************************************************/
package net.mediavrog.ani.easing;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class CustomEasing extends Easing {
  private static HashMap<String, CustomEasing> customEasingsLookup = new HashMap<String, CustomEasing>();
  private ArrayList<Segment> segments = new ArrayList<CustomEasing.Segment>();
  private String name;
  
  private class Segment{
    public float s;
    public float cp;
    public float e;
    
    public Segment(float s, float cp, float e) {
      this.s = s;
      this.cp = cp;
      this.e = e;
    }
  }

  public CustomEasing(String theName, String theSegments){
    // no use here for easingMode ... just inherited from superclass
    setMode(easingMode);

    this.name = theName;
    this.segments = new ArrayList<CustomEasing.Segment>();

    // parse theSegments string in property list style 
    // e.g. [{s:0,cp:0.54,e:0.748},{s:0.748,cp:0.956,e:0.832},{s:0.832,cp:0.708,e:1}]
    Pattern regex = Pattern.compile("\\{(.*?)\\}");
    Matcher regexMatcher = regex.matcher(theSegments.toLowerCase());
    
    while (regexMatcher.find()) {
      String segmentString = regexMatcher.group();
      segmentString = segmentString.replace( '{', ' ' );
      segmentString = segmentString.replace( '}', ' ' );
      segmentString = segmentString.trim();

      String[] segmentPropertiesString = segmentString.split(",");
      HashMap<String, Float> segmentProperties = new HashMap<String, Float>();
      for (int i = 0; i < segmentPropertiesString.length; i++) {
        String[] p = segmentPropertiesString[i].trim().split(":");
        segmentProperties.put( p[0].trim(), Float.parseFloat(p[1]) );
      }
      segments.add(new Segment(segmentProperties.get("s"), 
                   segmentProperties.get("cp"), 
                   segmentProperties.get("e") ));
    }

    customEasingsLookup.put(name, this);
    //Log.d(ANI_DEBUG_PREFIX+" Info @ CustomEasing -> add CustomEasing: "+theName);
  }
  
  public static CustomEasing create(String theName, String theSegments) {
    CustomEasing tmp = new CustomEasing(theName, theSegments);
    return tmp;
  }
  
  public static CustomEasing byName(String theName) {
    return customEasingsLookup.get(theName);
  }
  
  public float easeIn(float t, float b, float c, float d) {
    return easeBezier(t, b, c, d);
  }

  public float easeOut(float t, float b, float c, float d) {
    return easeBezier(t, b, c, d);
  }

  public float easeInOut(float t, float b, float c, float d) {
    return easeBezier(t, b, c, d);
  }
  private float easeBezier(float t, float b , float c, float d) {
    float factor = t / d; 
    int qty = segments.size(); 
    int i = (int)(qty * factor);
    i = Math.min(i, segments.size()-1);
    float time = (factor - (i * (1 / (float)qty))) * qty;
    Segment s = segments.get(i);
    //Log.d("tmp: "+time);
    return b + c * (s.s + time * (2 * (1 - time) * (s.cp - s.s) + time * (s.e - s.s)));
  }

}

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