react-native-fiesta/lib/module/components/Confetti.js

A set of celebration animations powered by Skia. Engage more with your users by celebrating in your React Native application.

import React, { memo, useEffect, useMemo } from 'react';
import { Rect, vec } from '@shopify/react-native-skia';
import { useDerivedValue, useSharedValue, withRepeat, withTiming } from 'react-native-reanimated';
import { screenHeight } from '../constants/dimensions';
import { degreesToRadians, randomIntFromInterval, DEFAULT_ANIMATION_DURATION } from '../utils/confettis';
export const Confetti = /*#__PURE__*/memo(({
  initialPosition = {
    x: 0,
    y: 0
  },
  color = '#fff',
  index = 0,
  size = 30,
  duration = DEFAULT_ANIMATION_DURATION
}) => {
  const randomDuration = useMemo(() => randomIntFromInterval(duration, duration * 1.5), [duration]);
  const yPosition = useSharedValue(-screenHeight / 2 + initialPosition.y);
  const xOrigin = useSharedValue(initialPosition.x);
  const rotateValue = useSharedValue(0);
  const scaleYValue = useSharedValue(Math.random() < 0.5 ? -0.5 : 0.5);
  useEffect(() => {
    yPosition.value = withTiming(screenHeight + 300, {
      duration: randomDuration
    });
    xOrigin.value = withRepeat(withTiming(initialPosition.x + randomIntFromInterval(100, 50), {
      duration: randomDuration
    }), -1, true);
    rotateValue.value = withRepeat(withTiming(degreesToRadians(Math.random() < 0.5 ? -360 : 360), {
      duration: randomDuration / 2
    }), -1, true);
    scaleYValue.value = withRepeat(withTiming(0, {
      duration: randomDuration / 2
    }), -1, true);
  }, [initialPosition.x, randomDuration, rotateValue, scaleYValue, xOrigin, yPosition]);
  const origin = useDerivedValue(() => vec(xOrigin.value, yPosition.value), [yPosition, xOrigin]);
  const matrix = useDerivedValue(() => [{
    scaleY: scaleYValue.value
  }, {
    rotate: rotateValue.value
  }, {
    skewX: scaleYValue.value / 2
  }, {
    skewY: -scaleYValue.value / 2
  }]);
  return /*#__PURE__*/React.createElement(Rect, {
    x: initialPosition.x,
    y: yPosition,
    width: size / 3,
    height: size,
    color: color,
    origin: origin,
    transform: matrix,
    key: index
  });
});
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