#Rebound
##About
Rebound is a java library that models spring dynamics. Rebound spring models can be used to create animations that feel natural by introducing real world physics to your application.
Rebound is not a general purpose physics library; however, spring dynamics can be used to drive a wide variety of animations. The simplicity of Rebound makes it easy to integrate and use as a building block for creating more complex components like pagers, toggles, and scrollers.
##Usage
Here's a simple example of using a Spring model to drive scaling animation on a View.
// Create a system to run the physics loop for a set of springs.
SpringSystem springSystem = SpringSystem.create();
// Add a spring to the system.
Spring spring = springSystem.createSpring();
// Add a listener to observe the motion of the spring.
spring.addListener(new SimpleSpringListener() {
@Override
public void onSpringUpdate(Spring spring) {
// You can observe the updates in the spring
// state by asking its current value in onSpringUpdate.
float value = (float) spring.getCurrentValue();
float scale = 1f - (value * 0.5f);
myView.setScaleX(scale);
myView.setScaleY(scale);
}
});
// Set the spring in motion; moving from 0 to 1
spring.setEndValue(1);##Download
Rebound is available as a prebuilt jar or can be built using Gradle or Buck.
Buck is a build system developed at Facebook that encourages the creation of small, reusable modules consisting of code and resources.
##License
BSD License
For Rebound software
Copyright (c) 2013, Facebook, Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
-
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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