Physics Based UI for Fun and Profit

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Physics based UI for Fun and Proﬁt

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Overview ▪ Material Design guidelines around motion ▪ Predeﬁned and Dynamic Animations ▪ How a physics system complements Material Design ▪ Brief detour into physics ▪ Rebound Library Walk thru ▪ Comparison of Rebound and Android SDK Animation Techniques ▪ Physics animation techniques

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Material Design

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Authentic Motion

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Consistent choreography

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Delightful Details

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Predeﬁned vs Dynamic

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Predeﬁned Animations

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Time Driven | Imperative

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Interpolators can provide realistic feeling curves

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Discrete user interactions

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Transitions

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Dynamic Animations

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Goal Driven | Declarative

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Continuous user interactions

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Retargetable

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Physics Deterministic

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A Physics system complements Material Design ▪ Authentic motion with a declarative programming model ▪ Consistent Choreography ▪ Delightful to the user

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Delightful Details

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Brief Detour into Physics

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Newton’s Laws of Motion

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Inertia

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f = ma

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For every action there is an equal and opposite reaction.

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Hooke’s Law

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f = -kx

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http://gafferongames.com/game-physics/spring-physics

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Rebound

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A simple library that accurately models spring dynamics for the purpose of driving physical animations.

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Born out of prototyping efforts for Facebook Home

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Brief trip down memory lane...

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Design Goals ▪ Not a replacement for a full physics engine ▪ Lightweight and cheap to integrate ▪ Not opinionated about rendering ▪ Low level building block to construct higher level components from

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More interesting as a pattern than as a framework * * but it’s a not a bad implementation of the pattern

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What can it help you build? ▪ delightful transitions ▪ toggles ▪ pagers ▪ scrollers ▪ Anything that involves goal driven animation with inertia…

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Hello World

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Core API ▪ SpringSystem ▪ Spring ▪ Listeners ▪ Utilities

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SpringSystem ▪ maintains a set of springs ▪ provides hooks for acting before and after each integration ▪ Is driven by a looper until equilibrium is achieved on all the springs it maintains ▪ allows synchronous and time choreographed simulation

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Spring ▪ A model of the motion of a spring ▪ accepts listeners and notifies of lifecycle events ▪ accepts a configuration object for defining spring tension and friction ▪ accepts a velocity and/or end value

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Listeners SpringListener ▪ onSpringActivate ▪ onSpringUpdate ▪ onSpringAtRest ▪ onSpringEndStateChange SpringSystemListener ▪ onBeforeIntegrate ▪ onAfterIntegrate

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Architecture

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SpringSystem Spring SpringSystemListener SpringListener creates/observes observes observes SpringLooper drives Concrete Classes SteppingLooper SynchronousLooper ChoreographerAndroidSpringLooper LegacyAndroidSpringLooper Methods onSpringActivate onSpringUpdate onSpringAtRest onSpringEndStateChange Methods onBeforeIntegrate onAfterIntegrate SpringConﬁg SpringConﬁgRegistry holds has Methods setCurrentValue setEndValue setVelocity

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Utilities ▪ SpringConﬁg provides tension and friction values to a spring ▪ SpringUtil provides helper functions for clamping and interpolating values in ranges ▪ ChoreographerCompat polyﬁlls the Choreographer timing API on pre-JellyBean

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More Utilities ▪ SpringConﬁguratorView provides an Android View for live tuning your SpringConﬁgs while the app is running ▪ AnimationQueue and SpringChain can help you create cascading effects

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SpringConﬁguratorView SpringChain

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Comparative Example

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Tips & Tricks

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Use 0 to 1 toggle Springs and interpolate

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Use springs to indirectly manipulate views

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Use a common Spring to converge animations

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Use SpringSystemListener to apply constraints

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Origami Integration

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Future Plans ▪ Release more components built on Rebound ▪ Iterate and Improve integration with Origami ▪ Create more examples of Rebound physics complementing Material design patterns

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Get the Code dependencies { compile 'com.facebook.rebound:rebound:0.3.7' } http://facebook.github.io/rebound or

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There’s a JavaScript version too! npm install rebound https://github.com/facebook/rebound-js or

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Thank you! @will_bailey [email protected]