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Practical UI Physics Dave DeSandro @desandro

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Physics

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Practical UI Physics

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Why Physics?

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Mouse ! Precision — pen Might not need physics

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Touch ! General — finger Physics feels right

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Box2D JS

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Practical You understand it User interface For the benefit of your users

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Practical UI physics Change position with drag Keep moving after flick Flick movement slows Rubber band at ends

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Physics basics

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position velocity force friction

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function  update()  {      velocity  *=  friction      position  +=  velocity   }   ! function  applyForce(  force  )  {      velocity  +=  force   }

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Basics demo

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Drag demo

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Forces

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function  update()  {      velocity  *=  friction      position  +=  velocity   }   ! function  applyForce(  force  )  {      velocity  +=  force   }

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var  wind  //  particle  force   ! function  update()  {      applyForce(  wind  )      velocity  *=  friction      position  +=  velocity   }   ! function  applyForce(  force  )  {      velocity  +=  force   }

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Wind force demo

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position target distance  =  target  -­‐  position force  =  distance  *  strength

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var  attractionStrength  =  0.02;   ! function  update()  {      //  attract  particle  to  target      var  distance  =  target  -­‐  positionX;      var  attraction  =  distance  *
        attractionStrength;      applyForce(  attraction  );   !    //  integrate  physics      velocity  *=  friction;      position  +=  velocity;   }

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Attraction demo

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Conditional demo

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Flickity demo

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Bonus: 
 Rubber band bounds

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Rubber band bounds demo

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//  calculate  resting  position   rest  =  position  +      velocity  /  (  1  -­‐  friction  )

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function  update()  {      velocity  *=  friction      position  +=  velocity   }   ! function  applyForce(  force  )  {      velocity  +=  force   }

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More resources Nature of Code (Ch. 1 & 2)
 natureofcode.com Coding Math
 youtube.com/user/codingmath

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These demos codepen.io/desandro/tag/practical-ui-physics github.com/desandro/practical-ui-physics

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Thank you! — @desandro Try Flickity