View

• zoom and resolution express the same scale; resolution is projection units per pixel.
• getCenter returns projected coordinates, so convert with ol.proj.toLonLat before storing.
• animate accepts multiple segments, each with its own duration and easing.

var view = new ol.View({
  center: ol.proj.fromLonLat([116.391263, 39.907359]),
  zoom: 12,
  minZoom: 4,
  maxZoom: 18
});

/* 缩放到一个矩形范围，留 40 像素边距并带过渡 */
view.fit([116.30, 39.85, 116.50, 39.98], {
  padding: [40, 40, 40, 40],
  duration: 600
});

var resolution = view.getResolution();
var metersPerPixel = resolution;      // EPSG:3857 下单位就是米

/* 反过来设一个固定分辨率，相当于锁定显示比例 */
view.setResolution(10);

• Treating getCenter or calculateExtent output as longitude and latitude causes offset data.
• fit expects an extent in view projection, so passing raw lon/lat bounds zooms to the wrong place.