react-native-zoom-toolkit/lib/module/commons/utils/getVisibleRect.js

Most complete set of pinch to zoom utilites for React Native

export const getVisibleRect = options => {
  'worklet';

  const {
    scale,
    translation,
    itemSize,
    containerSize
  } = options;
  const offsetX = (itemSize.width * scale - containerSize.width) / 2;
  const offsetY = (itemSize.height * scale - containerSize.height) / 2;
  const clampedX = Math.max(offsetX, 0);
  const clampedY = Math.max(offsetY, 0);
  const reducerX = (-1 * translation.x + clampedX) / (itemSize.width * scale);
  const reducerY = (-1 * translation.y + clampedY) / (itemSize.height * scale);
  const x = itemSize.width * reducerX;
  const y = itemSize.height * reducerY;
  const width = itemSize.width * Math.min(1, containerSize.width / (itemSize.width * scale));
  const height = itemSize.height * Math.min(1, containerSize.height / (itemSize.height * scale));
  return {
    x,
    y,
    width,
    height
  };
};
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