Function fitNwSe

src/lib/index.js:74–122

(nw, se, width, height)

}

function fitNwSe(nw, se, width, height) {
  const EPS = 0.000000001;
  const nwWorld = latLng2World(nw);
  const seWorld = latLng2World(se);
  const dx =
    nwWorld.x < seWorld.x ? seWorld.x - nwWorld.x : 1 - nwWorld.x + seWorld.x;
  const dy = seWorld.y - nwWorld.y;

  if (dx <= 0 && dy <= 0) {
    return null;
  }

  const zoomX = log2(width / GOOGLE_TILE_SIZE / Math.abs(dx));
  const zoomY = log2(height / GOOGLE_TILE_SIZE / Math.abs(dy));
  const zoom = Math.floor(EPS + Math.min(zoomX, zoomY));

  // TODO find center just unproject middle world point
  const middle = {
    x: nwWorld.x < seWorld.x // eslint-disable-line
        ? 0.5 * (nwWorld.x + seWorld.x)
        : nwWorld.x + seWorld.x - 1 > 0
        ? 0.5 * (nwWorld.x + seWorld.x - 1)
        : 0.5 * (1 + nwWorld.x + seWorld.x),
    y: 0.5 * (nwWorld.y + seWorld.y),
  };

  const scale = Math.pow(2, zoom);
  const halfW = width / scale / GOOGLE_TILE_SIZE / 2;
  const halfH = height / scale / GOOGLE_TILE_SIZE / 2;

  const newNW = world2LatLng({
    x: middle.x - halfW,
    y: middle.y - halfH,
  });

  const newSE = world2LatLng({
    x: middle.x + halfW,
    y: middle.y + halfH,
  });

  return {
    center: world2LatLng(middle),
    zoom,
    newBounds: {
      nw: newNW,
      se: newSE,
    },
  };
}

export function convertNeSwToNwSe({ ne, sw }) {
  return {