The version of rebound.js on npm has an outdated version of createSpring:

 createSpring: function() {
      var spring = new Spring(this);
      this.registerSpring(spring);
      return spring;
    },

Instead of what is in the docs

createSpring: function(tension, friction) {
      var spring = new Spring(this);
      this.registerSpring(spring);
      if (typeof tension === 'undefined' || typeof friction === 'undefined') {
        spring.setSpringConfig(SpringConfig.DEFAULT_ORIGAMI_SPRING_CONFIG);
      } else {
        var springConfig = SpringConfig.fromOrigamiTensionAndFriction(tension, friction);
        spring.setSpringConfig(springConfig);
      }
      return spring;
    },

When following the example in the docs it throws an error since this._springConfig is never defined in the old version. *Great addition btw

I would love to see rebound.js become it's own project with it's own repo etc. I have some performance improvements to add :)

The Android Gradle plugin has changed a bit since the last commit to this project, so I've updated the various build scripts to use the newest version (since current Android Studio requires it).

@willbailey What do you think about a sequencer Spring? It's similar of SpringChain but without any interaction with another springs. Look like:

SpringSquencer().create()
  .add(0, new Spring())
  .add(1, new Spring(), 1000)
  .add(2, new Spring());

The first spring(at 0 index) will run, when this animation ends, it will run the second spring(at index 1) and wait 1000 miliseconds to run the spring at index 2.

Would you explain to me how to understand these params by your sample app

  // On each update of the spring value, we adjust the scale of the image view to match the
      // springs new value. We use the SpringUtil linear interpolation function mapValueFromRangeToRange
      // to translate the spring's 0 to 1 scale to a 100% to 50% scale range and apply that to the View
      // with setScaleX/Y. Note that rendering is an implementation detail of the application and not
      // Rebound itself. If you need Gingerbread compatibility consider using NineOldAndroids to update
      // your view properties in a backwards compatible manner.
      float mappedValue = (float) SpringUtil.mapValueFromRangeToRange(spring.getCurrentValue(), 0, 1, 1, 0.5);

At the end, I would like to apply the spring's 0 to 1 to 400dp to 100 dp in the layout height. Please let me know how to apply it into SpringUtil.mapValueFromRangeToRange(spring.getCurrentValue(), 0, 1, 1, 0.5);. Thank you so much.

Guava is used for Preconditions and list/map utilities. There is no reason to force downstream consumers of this library to bundle a massive 2.1MB jar when you aren't even really using it.

Preconditions is easily inlined since they amount to just an if+throw. The list and map utilities are easily replaced by instantiating lists and maps yourself and using Collections.unmodifiableFoo(new Foo(thing)) for defensive copies.

I would have sent a pull request, but buck isn't on brew and didn't work with java 6, 7, or 8 on my system.

Hi, I would like to be able to download the samples apk. I tried to compile the source code, but I just have the jdk 1.8 in my machine and #53 says it is not compatible with that..so, could you, please, make the samples apk available?

If you call the following consecutively it produces a Concurrent Exception, see the Stacktrace below.

Seems that ReentrantCallback is not as safe as intended.

mSpringFrom.addListener(new SimpleSpringListener() {
            @Override
            public void onSpringUpdate(final Spring spring) {
                from.setTranslationX((float) spring.getCurrentValue());
            }

            @Override
            public void onSpringAtRest(final Spring spring) {
                removeView(from);
                mSpringFrom.removeListener(this);
            }
        });

java.util.ConcurrentModificationException
            at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
            at java.util.HashMap$KeyIterator.next(HashMap.java:833)
            at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:960)
            at com.facebook.rebound.Spring.advance(Spring.java:402)
            at com.facebook.rebound.BaseSpringSystem.advance(BaseSpringSystem.java:138)
            at com.facebook.rebound.BaseSpringSystem.loop(BaseSpringSystem.java:159)
            at com.facebook.rebound.AndroidSpringLooperFactory$ChoreographerAndroidSpringLooper$1.doFrame(AndroidSpringLooperFactory.java:108)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:759)
            at android.view.Choreographer.doCallbacks(Choreographer.java:574)
            at android.view.Choreographer.doFrame(Choreographer.java:543)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

Hi,

Just saw we can list app using rebound here. Inflikr is using it for some animations. Like here http://www.youtube.com/watch?v=a8A80I8S3fs#t=26

Playstore link https://play.google.com/store/apps/details?id=kr.infli

Thanks

• Add repository (fixes npm repo rebound)
• Add bugs (fixes npm bugs rebound)
• Add keywords (helps discoverability with npm search)
• Add author
• Add license

Not sure if this is known, but installing Rebound using JDK 1.8u25 fails (both Playground and Example). It's weird because Gradle says the build succeeds until I try to push it to a device. JDK 1.7u75 has no issues, so I'm not too sure exactly what's going on. I don't see any specific build.gradle or settings.gradle files which specify a JDK version to build with either.

Error occurs during preDexDebug:

UNEXPECTED TOP-LEVEL EXCEPTION: com.android.dx.cf.iface.ParseException: bad class file magic (cafebabe) or version (0034.0000) at com.android.dx.cf.direct.DirectClassFile.parse0(DirectClassFile.java:472) at com.android.dx.cf.direct.DirectClassFile.parse(DirectClassFile.java:406) at com.android.dx.cf.direct.DirectClassFile.parseToInterfacesIfNecessary(DirectClassFile.java:388) at com.android.dx.cf.direct.DirectClassFile.getMagic(DirectClassFile.java:251) at com.android.dx.command.dexer.Main.processClass(Main.java:665) at com.android.dx.command.dexer.Main.processFileBytes(Main.java:634) at com.android.dx.command.dexer.Main.access$600(Main.java:78) at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:572) at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284) at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166) at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144) at com.android.dx.command.dexer.Main.processOne(Main.java:596) at com.android.dx.command.dexer.Main.processAllFiles(Main.java:498) at com.android.dx.command.dexer.Main.runMonoDex(Main.java:264) at com.android.dx.command.dexer.Main.run(Main.java:230) at com.android.dx.command.dexer.Main.main(Main.java:199) at com.android.dx.command.Main.main(Main.java:103) ...while parsing com/facebook/rebound/BaseSpringSystem.class

This adds the ability to change the simulation speed for debugging purposes, and also the ability to change the simulation speed from the SpringConfiguratorView.

This is pull request was created automatically because we noticed your project was missing a Code of Conduct file.

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This PR was crafted with love by Facebook's Open Source Team.

• Updated the following components:

• Gradle wrapper from 2.2.1 to 4.10.1
• Gradle version from 1.2.3 to 3.3.1

• Added google() and jcenter() repositories instead of using mavenCentral()
• Removed buildToolsVersion from .gradle files (no longer required)
• Updated variant.javaCompile to variant.javaCompileProvider.get() (soon will be deprecated)
• Updated compile to implementation (deprecated on latest gradle versions)
• Removed uses-sdk tag from AndroidManifest (no longer required)
• Added dependencie :rebound-core to example and playground in other to run these projects

Hi.

SpringOverScroller.java#L86-L87: getCurrVelocity

  public float getCurrVelocity() {
    double velX = mSpringX.getVelocity();
    double velY = mSpringX.getVelocity();
    return (int) Math.sqrt(velX * velX + velY * velY);
  }

It is suspicious that the variables 'velX' and 'velY' are initialized with the same value.

Probably, it should be:

  public float getCurrVelocity() {
    double velX = mSpringX.getVelocity();
    double velY = mSpringY.getVelocity();
    return (int) Math.sqrt(velX * velX + velY * velY);
  }

This possible defect found by AppChecker.