根據縮放級別和中心點創建latLngBounds

Question

我有一個列表，其中列出了我需要在不移動地圖的情況下基於相對於地圖項的地圖邊界框運行操作的地圖項/多邊形。

為了進一步解釋我的問題，我可以舉一個例子，說明在移動地圖不是問題的情況下如何執行此操作：

features.forEach(function (feature) {
    var bbox,
        ne,
        sw,
        fBounds,
        zoom,
        mBounds;

    bbox = feature.geometry.bbox;
    sw = L.latLng(bbox[1], bbox[0]);
    ne = L.latLng(bbox[3], bbox[2]);
    fBounds = L.latLngBounds(sw, ne);
    map.fitBounds(bounds);
    mBounds = map.getBounds();
    zoom = map.getZoom();
    //Execute operation based on mBounds and zoom
}    

我已經測試了很多，這是我與工作代碼段最接近的內容：

        var self = this,
            bbox,
            sw,
            ne,
            bounds,
            zoom,
            swPoint,
            nePoint,
            center,
            factor,
            dw,
            dh,
            cpx;

        bbox = feature.geometry.bbox;
        sw = L.latLng(bbox[1], bbox[0]);
        ne = L.latLng(bbox[3], bbox[2]);
        bounds = L.latLngBounds(sw, ne);
        zoom = self.map.getBoundsZoom(bounds, false); //maxZoom?
        swPoint = self.map.project(bounds.getSouthWest(), zoom),
        nePoint = self.map.project(bounds.getNorthEast(), zoom),
        center = self.map.unproject(swPoint.add(nePoint).divideBy(2), zoom);

        factor = self.map.options.crs.scale(zoom) / 8388608;
        dw = self.map.getSize().x / 2*factor;
        dh = self.map.getSize().y / 2*factor;
        cpx = self.map.options.crs.latLngToPoint(center, zoom);            

        return {
            ne: self.map.options.crs.pointToLatLng(L.point(cpx.x + dw, cpx.y - dh, false), zoom),
            sw: self.map.options.crs.pointToLatLng(L.point(cpx.x - dw, cpx.y + dh, false), zoom),
            center: center,
            zoom: zoom
        }

        //Execute operation based on returned object, repeat for every feature

這是“有效的”，但它給出的結果與第一個代碼段的結果不同（即結果不正確）。

Answer 1

以下代碼段對我有用，以防其他人有同樣的問題：

var self = this,
    bbox,
    sw,
    ne,
    bounds,
    zoom,
    center;

bbox = feature.geometry.bbox;
sw = L.latLng(bbox[1], bbox[0]);
ne = L.latLng(bbox[3], bbox[2]);
bounds = L.latLngBounds(sw, ne);
zoom = self.map.getBoundsZoom(bounds, false); //maxZoom?
sw = self.map.project(bounds.getSouthWest(), zoom),
ne = self.map.project(bounds.getNorthEast(), zoom),
center = self.map.unproject(sw.add(ne).divideBy(2), zoom);

bounds = self.map.getPixelBounds(center, zoom),
sw = self.map.unproject(b2.getBottomLeft()),
ne = self.map.unproject(b2.getTopRight());

return new L.LatLngBounds(sw, ne);