javascript - 如何在谷歌地图中显示经度和纬度(矢量变化)

Question

我如何在谷歌地图中显示经度和纬度(矢量变化)，以前有人用过吗？P.S:Delta经度和纬度与经度和纬度不同。

Answer 1

您可以引用这个thread 。给定一个坐标数组 coords，此函数返回包含这些坐标的区域(纬度、经度和增量)。

export function getRegionForCoordinates(points) {
  // points should be an array of { latitude: X, longitude: Y }
  let minX, maxX, minY, maxY;

  // init first point
  ((point) => {
    minX = point.latitude;
    maxX = point.latitude;
    minY = point.longitude;
    maxY = point.longitude;
  })(points[0]);

  // calculate rect
  points.map((point) => {
    minX = Math.min(minX, point.latitude);
    maxX = Math.max(maxX, point.latitude);
    minY = Math.min(minY, point.longitude);
    maxY = Math.max(maxY, point.longitude);
  });

  const midX = (minX + maxX) / 2;
  const midY = (minY + maxY) / 2;
  const deltaX = (maxX - minX);
  const deltaY = (maxY - minY);

  return {
    latitude: midX,
    longitude: midY,
    latitudeDelta: deltaX,
    longitudeDelta: deltaY
  };
}

以下是一些相关主题:

• Calculate latitudeDelta and longitudeDelta in titanium maps [Android]
• How to calculate delta latitude and longitude for MapView component in React-Native?