ffrgb / meshviewer

define(function () {

  /**

   * https://github.com/Mappy/Leaflet-active-area

   * Apache 2.0 license https://www.apache.org/licenses/LICENSE-2.0

   */

  var previousMethods = {

    setView: L.Map.prototype.setView,

    setZoomAround: L.Map.prototype.setZoomAround,

    getBoundsZoom: L.Map.prototype.getBoundsZoom,

    PopupAdjustPan: L.Popup.prototype._adjustPan,

    RendererUpdate: L.Renderer.prototype._update

  };

  L.Map.include({

    getBounds: function () {

      if (this._viewport) {

        return this.getViewportLatLngBounds();

      }

      var bounds = this.getPixelBounds();

      var sw = this.unproject(bounds.getBottomLeft());

      var ne = this.unproject(bounds.getTopRight());

    },

    getViewport: function () {

      return this._viewport;

    },

    getViewportBounds: function () {

      var vp = this._viewport;

      var vpsize = L.point(vp.clientWidth, vp.clientHeight);

      if (vpsize.x === 0 || vpsize.y === 0) {

        // Our own viewport has no good size - so we fallback to the container size:

        vp = this.getContainer();

        if (vp) {

          topleft = L.point(0, 0);

          vpsize = L.point(vp.clientWidth, vp.clientHeight);

        }

      }

      return L.bounds(topleft, topleft.add(vpsize));

    },

    getViewportLatLngBounds: function () {

      var bounds = this.getViewportBounds();

    },

    getOffset: function () {

      var mCenter = this.getSize().divideBy(2);

      var vCenter = this.getViewportBounds().getCenter();

      return mCenter.subtract(vCenter);

    },

    getCenter: function (withoutViewport) {

      var center = previousMethods.getCenter.call(this);

      if (this.getViewport() && !withoutViewport) {

        var zoom = this.getZoom();

        var point = this.project(center, zoom);

        point = point.subtract(this.getOffset());

        center = this.unproject(point, zoom);

      }

      return center;

    },

    setView: function (center, zoom, options) {

      zoom = zoom === undefined ? this._zoom : this._limitZoom(zoom);

      if (this.getViewport()) {

        var point = this.project(center, this._limitZoom(zoom));

        point = point.add(this.getOffset());

        center = this.unproject(point, this._limitZoom(zoom));

      }

      return previousMethods.setView.call(this, center, zoom, options);

    },

    setZoomAround: function (latlng, zoom, options) {

      var vp = this.getViewport();

      if (vp) {

        var scale = this.getZoomScale(zoom);

        var viewHalf = this.getViewportBounds().getCenter();

        var centerOffset = containerPoint.subtract(viewHalf).multiplyBy(1 - 1 / scale);

        var newCenter = this.containerPointToLatLng(viewHalf.add(centerOffset));

        return this.setView(newCenter, zoom, { zoom: options });

      }

      return previousMethods.setZoomAround.call(this, latlng, zoom, options);

    },

    getBoundsZoom: function (bounds, inside, padding) { // (LatLngBounds[, Boolean, Point]) -> Number

      padding = L.point(padding || [0, 0]);

      var zoom = this.getZoom() || 0;

      var min = this.getMinZoom();

      var max = this.getMaxZoom();

      var nw = bounds.getNorthWest();

      var se = bounds.getSouthEast();

      var vp = this.getViewport();

      var size = (vp ? L.point(vp.clientWidth, vp.clientHeight) : this.getSize()).subtract(padding);

      var boundsSize = this.project(se, zoom).subtract(this.project(nw, zoom));

      var snap = L.Browser.any3d ? this.options.zoomSnap : 1;

      var scale = Math.min(size.x / boundsSize.x, size.y / boundsSize.y);

      zoom = this.getScaleZoom(scale, zoom);

      if (snap) {

        zoom = Math.round(zoom / (snap / 100)) * (snap / 100); // don't jump if within 1% of a snap level

        zoom = inside ? Math.ceil(zoom / snap) * snap : Math.floor(zoom / snap) * snap;

      }

      return Math.max(min, Math.min(max, zoom));

    }

  });

  L.Map.include({

    setActiveArea: function (css, keepCenter, animate) {

      var center;

      if (keepCenter && this._zoom) {

        // save center if map is already initialized

        // and keepCenter is passed

        center = this.getCenter();

      }

      if (!this._viewport) {

        // Make viewport if not already made

        var container = this.getContainer();

        container.insertBefore(this._viewport, container.firstChild);

      }

      if (typeof css === 'string') {

        this._viewport.className = css;

      } else {

        L.extend(this._viewport.style, css);

      }

      if (center) {

        this.setView(center, this.getZoom(), { animate: !!animate });

      }

      return this;

    }

  });

  L.Renderer.include({

    _onZoom: function () {

      this._updateTransform(this._map.getCenter(true), this._map.getZoom());

    },

    _update: function () {

      previousMethods.RendererUpdate.call(this);

      this._center = this._map.getCenter(true);

    }

  });

    _updateLevels: function () {

      var zoom = this._tileZoom;

      var maxZoom = this.options.maxZoom;

      if (zoom === undefined) {

        return undefined;

      }

        if (this._levels[z].el.children.length || z === zoom) {

          this._levels[z].el.style.zIndex = maxZoom - Math.abs(zoom - z);

        } else {

          this._removeTilesAtZoom(z);

          delete this._levels[z];

        }

      }

      var level = this._levels[zoom];

      var map = this._map;

      if (!level) {

        level = this._levels[zoom] = {};

        level.el = L.DomUtil.create('div', 'leaflet-tile-container leaflet-zoom-animated', this._container);

        level.el.style.zIndex = maxZoom;

        level.origin = map.project(map.unproject(map.getPixelOrigin()), zoom).round();

        level.zoom = zoom;

        this._setZoomTransform(level, map.getCenter(true), map.getZoom());

        // force the browser to consider the newly added element for transition

        L.Util.falseFn(level.el.offsetWidth);

      }

      this._level = level;

      return level;

    },

    _resetView: function (e) {

      var animating = e && (e.pinch || e.flyTo);

      this._setView(this._map.getCenter(true), this._map.getZoom(), animating, animating);

    },

    _update: function (center) {

      var map = this._map;

      if (!map) {

        return;

      }

      var zoom = map.getZoom();

      if (center === undefined) {

        center = map.getCenter(this);

      }

      if (this._tileZoom === undefined) {

        return;

      }    // if out of minzoom/maxzoom

      var pixelBounds = this._getTiledPixelBounds(center);

      var tileRange = this._pxBoundsToTileRange(pixelBounds);

      var tileCenter = tileRange.getCenter();

      var queue = [];

        this._tiles[key].current = false;

      }

      // _update just loads more tiles. If the tile zoom level differs too much

      // from the map's, let _setView reset levels and prune old tiles.

      if (Math.abs(zoom - this._tileZoom) > 1) {

        this._setView(center, zoom);

        return;

      }

      // create a queue of coordinates to load tiles from

      for (var j = tileRange.min.y; j <= tileRange.max.y; j++) {

        for (var i = tileRange.min.x; i <= tileRange.max.x; i++) {

          coords.z = this._tileZoom;

          if (!this._isValidTile(coords)) {

            continue;

          }

          var tile = this._tiles[this._tileCoordsToKey(coords)];

          if (tile) {

            tile.current = true;

          } else {

            queue.push(coords);

          }

        }

      }

      // sort tile queue to load tiles in order of their distance to center

      queue.sort(function (a, b) {

        return a.distanceTo(tileCenter) - b.distanceTo(tileCenter);

      });

      if (queue.length !== 0) {

        // if its the first batch of tiles to load

        if (!this._loading) {

          this._loading = true;

          // @event loading: Event

          // Fired when the grid layer starts loading tiles

          this.fire('loading');

        }

        // create DOM fragment to append tiles in one batch

        var fragment = document.createDocumentFragment();

        for (i = 0; i < queue.length; i++) {

          this._addTile(queue[i], fragment);

        }

        this._level.el.appendChild(fragment);

      }

    }

  });

    _adjustPan: function () {

      if (!this._map._viewport) {

        previousMethods.PopupAdjustPan.call(this);

      } else {

        if (!this.options.autoPan || (this._map._panAnim && this._map._panAnim._inProgress)) {

          return;

        }

        var map = this._map;

        var vp = map._viewport;

        var containerHeight = this._container.offsetHeight;

        var containerWidth = this._containerWidth;

        var layerPos = new L.Point(

          this._containerLeft - vpTopleft.x,

          -containerHeight - this._containerBottom - vpTopleft.y);

        if (this._zoomAnimated) {

          layerPos._add(L.DomUtil.getPosition(this._container));

        }

        var containerPos = map.layerPointToContainerPoint(layerPos);

        var padding = L.point(this.options.autoPanPadding);

        var paddingTL = L.point(this.options.autoPanPaddingTopLeft || padding);

        var paddingBR = L.point(this.options.autoPanPaddingBottomRight || padding);

        var size = L.point(vp.clientWidth, vp.clientHeight);

        var dx = 0;

        var dy = 0;

        if (containerPos.x + containerWidth + paddingBR.x > size.x) { // right

          dx = containerPos.x + containerWidth - size.x + paddingBR.x;

        }

        if (containerPos.x - dx - paddingTL.x < 0) { // left

          dx = containerPos.x - paddingTL.x;

        }

        if (containerPos.y + containerHeight + paddingBR.y > size.y) { // bottom

          dy = containerPos.y + containerHeight - size.y + paddingBR.y;

        }

        if (containerPos.y - dy - paddingTL.y < 0) { // top

          dy = containerPos.y - paddingTL.y;

        }

        // @namespace Map

        // @section Popup events

        // @event autopanstart

        // Fired when the map starts autopanning when opening a popup.

        if (dx || dy) {

          map

            .fire('autopanstart')

            .panBy([dx, dy]);

        }

      }

    }

  });

});