React Spring

React Spring Animation Principles

Implement all 12 Disney animation principles using React Spring's spring physics system.

1. Squash and Stretch

const [springs, api] = useSpring(() => ({
  scaleX: 1,
  scaleY: 1,
  config: { tension: 300, friction: 10 }
}));

api.start({ scaleX: 1.2, scaleY: 0.8 });
<animated.div style={springs} />

2. Anticipation

const [props, api] = useSpring(() => ({ y: 0, scaleY: 1 }));

const jump = async () => {
  await api.start({ y: 10, scaleY: 0.9 }); // wind up
  api.start({ y: -200, config: { tension: 200 } }); // action
};

3. Staging

const bgSpring = useSpring({ filter: 'blur(3px)', opacity: 0.6 });
const heroSpring = useSpring({ scale: 1.1, zIndex: 10 });

4. Straight Ahead / Pose to Pose

const [props] = useSpring(() => ({
  from: { x: 0, y: 0 },
  to: [
    { x: 100, y: -50 },
    { x: 200, y: 0 },
    { x: 300, y: -30 }
  ]
}));

5. Follow Through and Overlapping Action

const bodySpring = useSpring({ x: 200 });
const hairSpring = useSpring({ x: 200, delay: 50 });
const capeSpring = useSpring({ x: 200, delay: 100, config: { friction: 15 } });

6. Slow In and Slow Out

const spring = useSpring({
  x: 300,
  config: {
    tension: 170,
    friction: 26 // balanced = smooth in/out
  }
});
// High tension + low friction = fast
// Low tension + high friction = slow

7. Arc

const [props] = useSpring(() => ({
  to: async (next) => {
    await next({ x: 100, y: -100 });
    await next({ x: 200, y: 0 });
  },
  config: { tension: 200, friction: 20 }
}));

8. Secondary Action

const buttonSpring = useSpring({ scale: hover ? 1.05 : 1 });
const iconSpring = useSpring({
  rotate: hover ? 15 : 0,
  delay: 50
});

9. Timing

const configs = {
  fast: { tension: 400, friction: 30 },
  normal: { tension: 170, friction: 26 },
  slow: { tension: 100, friction: 40 },
  wobbly: { tension: 180, friction: 12 }
};
// Or use presets: config.gentle, config.stiff, config.slow

10. Exaggeration

const spring = useSpring({
  scale: 1.5,
  rotate: 720,
  config: { tension: 200, friction: 8 } // low friction = overshoot
});

11. Solid Drawing

const spring = useSpring({
  transform: 'perspective(1000px) rotateX(45deg) rotateY(30deg)'
});

12. Appeal

const cardSpring = useSpring({
  scale: hover ? 1.02 : 1,
  boxShadow: hover
    ? '0 20px 40px rgba(0,0,0,0.2)'
    : '0 5px 15px rgba(0,0,0,0.1)',
  config: config.gentle
});

useTrail for Stagger

const trail = useTrail(items.length, {
  opacity: show ? 1 : 0,
  y: show ? 0 : 20,
  config: { tension: 200, friction: 20 }
});

trail.map((props, i) => <animated.div style={props}>{items[i]}</animated.div>)

Key React Spring Features

• useSpring - Single animation
• useSprings - Multiple springs
• useTrail - Staggered animations
• useChain - Sequence animations
• useTransition - Mount/unmount animations
• config presets - gentle, stiff, slow, molasses
• Physics-based: tension, friction, mass, velocity

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