react-native-wagmi-charts/lib/module/charts/line/useCurrentY.js

A sweet candlestick chart for React Native

import { useContext, useMemo } from 'react';
import { useDerivedValue } from 'react-native-reanimated';
import { getYForX, parse } from 'react-native-redash';
import { LineChartContext } from './Context';
import { LineChartDimensionsContext } from './Chart';
export function useCurrentY() {
  const {
    path,
    width
  } = useContext(LineChartDimensionsContext);
  const {
    currentX
  } = useContext(LineChartContext);
  const parsedPath = useMemo(() => path ? parse(path) : undefined, [path]);
  const currentY = useDerivedValue(() => {
    if (!parsedPath) {
      return -1;
    }
    const boundedX = Math.min(width, currentX.value);
    return getYForX(parsedPath, boundedX) || 0;
  }, [parsedPath, width, currentX]);
  return currentY;
}
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