+++ /dev/null
-/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
- * See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
- * text of the license. */
-// @require: OpenLayers/Layer.js
-// @require: OpenLayers/Util.js
-OpenLayers.Layer.Grid = Class.create();
-OpenLayers.Layer.Grid.TILE_WIDTH = 256;
-OpenLayers.Layer.Grid.TILE_HEIGHT = 256;
-OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
-
- // str: url
- url: null,
-
- // hash: params
- params: null,
-
- // tileSize: OpenLayers.Size
- tileSize: null,
-
- // grid: Array(Array())
- // this is an array of rows, each row is an array of tiles
- grid: null,
-
- /**
- * @param {str} name
- * @param {str} url
- * @param {hash} params
- */
- initialize: function(name, url, params) {
- var newArguments = arguments;
- if (arguments.length > 0) {
- newArguments = [name];
- }
- OpenLayers.Layer.prototype.initialize.apply(this, newArguments);
- this.url = url;
- this.params = params;
- this.tileSize = new OpenLayers.Size(OpenLayers.Layer.Grid.TILE_WIDTH,
- OpenLayers.Layer.Grid.TILE_HEIGHT);
- },
-
- /**
- *
- */
- destroy: function() {
- this.params = null;
- this.clearGrid();
- this.grid = null;
- OpenLayers.Layer.prototype.destroy.apply(this, arguments);
- },
-
- setTileSize: function (size) {
- this.tileSize = size.copyOf();
- },
-
- /**
- * moveTo
- * moveTo is a function called whenever the map is moved. All the moving
- * of actual 'tiles' is done by the map, but moveTo's role is to accept
- * a bounds and make sure the data that that bounds requires is pre-loaded.
- * @param {OpenLayers.Bounds}
- */
- moveTo:function(bounds,zoomChanged) {
- if (!this.getVisibility()) {
- if (zoomChanged) {
- this.grid = null;
- }
- return;
- }
- if (!this.grid || zoomChanged) {
- this._initTiles();
- } else {
- var i = 0;
- while (this.getGridBounds().bottom > bounds.bottom) {
- this.insertRow(false);
- }
- while (this.getGridBounds().left > bounds.left) {
- this.insertColumn(true);
- }
- while (this.getGridBounds().top < bounds.top) {
- this.insertRow(true);
- }
- while (this.getGridBounds().right < bounds.right) {
- this.insertColumn(false);
- }
- }
- },
- getGridBounds:function() {
- var topLeftTile = this.grid[0][0];
- var bottomRightTile = this.grid[this.grid.length-1][this.grid[0].length-1];
- return new OpenLayers.Bounds(topLeftTile.bounds.left,
- bottomRightTile.bounds.bottom,
- bottomRightTile.bounds.right,
- topLeftTile.bounds.top);
- },
-
- /**
- */
- _initTiles:function() {
-
- //first of all, clear out the main div
- this.div.innerHTML = "";
-
- //now clear out the old grid and start a new one
- this.clearGrid();
- this.grid = new Array();
-
- var viewSize = this.map.getSize();
- var bounds = this.map.getExtent();
- var extent = this.map.getFullExtent();
- var resolution = this.map.getResolution();
- var tilelon = resolution*this.tileSize.w;
- var tilelat = resolution*this.tileSize.h;
-
- var offsetlon = bounds.left - extent.left;
- var tilecol = Math.floor(offsetlon/tilelon);
- var tilecolremain = offsetlon/tilelon - tilecol;
- var tileoffsetx = -tilecolremain * this.tileSize.w;
- var tileoffsetlon = extent.left + tilecol * tilelon;
-
- var offsetlat = bounds.top - (extent.bottom + tilelat);
- var tilerow = Math.ceil(offsetlat/tilelat);
- var tilerowremain = tilerow - offsetlat/tilelat;
- var tileoffsety = -tilerowremain * this.tileSize.h;
- var tileoffsetlat = extent.bottom + tilerow * tilelat;
-
- tileoffsetx = Math.round(tileoffsetx); // heaven help us
- tileoffsety = Math.round(tileoffsety);
-
- this.origin = new OpenLayers.Pixel(tileoffsetx,tileoffsety);
-
- var startX = tileoffsetx;
- var startLon = tileoffsetlon;
-
- do {
- var row = new Array();
- this.grid.append(row);
- tileoffsetlon = startLon;
- tileoffsetx = startX;
- do {
- var tileBounds = new OpenLayers.Bounds(tileoffsetlon,
- tileoffsetlat,
- tileoffsetlon+tilelon,
- tileoffsetlat+tilelat);
-
- var tile = this.addTile(tileBounds,
- new OpenLayers.Pixel(tileoffsetx - parseInt(this.map.layerContainerDiv.style.left),
- tileoffsety - parseInt(this.map.layerContainerDiv.style.top))
- );
- tile.draw((this.params.TRANSPARENT == 'true'));
- row.append(tile);
-
- tileoffsetlon += tilelon;
- tileoffsetx += this.tileSize.w;
- } while (tileoffsetlon < bounds.right)
-
- tileoffsetlat -= tilelat;
- tileoffsety += this.tileSize.h;
- } while(tileoffsetlat > bounds.bottom - tilelat)
-
- },
-
- /**
- * @param {bool} prepend - if true, prepend to beginning.
- * if false, then append to end
- */
- insertRow:function(prepend) {
- var modelRowIndex = (prepend) ? 0 : (this.grid.length - 1);
- var modelRow = this.grid[modelRowIndex];
-
- var newRow = new Array();
-
- var resolution = this.map.getResolution();
- var deltaY = (prepend) ? -this.tileSize.h : this.tileSize.h;
- var deltaLat = resolution * -deltaY;
-
- for (var i=0; i < modelRow.length; i++) {
- var modelTile = modelRow[i];
- var bounds = modelTile.bounds.copyOf();
- var position = modelTile.position.copyOf();
- bounds.bottom = bounds.bottom + deltaLat;
- bounds.top = bounds.top + deltaLat;
- position.y = position.y + deltaY;
- var newTile = this.addTile(bounds, position);
- newTile.draw((this.params.TRANSPARENT == 'true'));
- newRow.append(newTile);
- }
-
- if (newRow.length>0){
- if (prepend) {
- this.grid.prepend(newRow);
- } else {
- this.grid.append(newRow);
- }
- }
- },
-
- /**
- * @param {bool} prepend - if true, prepend to beginning.
- * if false, then append to end
- */
- insertColumn:function(prepend) {
- var modelCellIndex;
- var deltaX = (prepend) ? -this.tileSize.w : this.tileSize.w;
- var resolution = this.map.getResolution();
- var deltaLon = resolution * deltaX;
-
- for (var i=0; i<this.grid.length; i++) {
- var row = this.grid[i];
- modelTileIndex = (prepend) ? 0 : (row.length - 1);
- var modelTile = row[modelTileIndex];
-
- var bounds = modelTile.bounds.copyOf();
- var position = modelTile.position.copyOf();
- bounds.left = bounds.left + deltaLon;
- bounds.right = bounds.right + deltaLon;
- position.x = position.x + deltaX;
- var newTile = this.addTile(bounds, position);
- newTile.draw((this.params.TRANSPARENT == 'true'));
-
- if (prepend) {
- row = row.prepend(newTile);
- } else {
- row = row.append(newTile);
- }
- }
- },
- /** combine the ds's serverPath with its params and the tile's params.
- *
- * does checking on the serverPath variable, allowing for cases when it
- * is supplied with trailing ? or &, as well as cases where not.
- *
- * return in formatted string like this:
- * "server?key1=value1&key2=value2&key3=value3"
- *
- * @return {str}
- */
- getFullRequestString:function(params) {
- var requestString = "";
- this.params.SRS = this.map.projection;
- // concat tile params with layer params and convert to string
- var allParams = Object.extend(this.params, params);
- var paramsString = OpenLayers.Util.getParameterString(allParams);
-
- var server = this.url;
- var lastServerChar = server.charAt(server.length - 1);
-
- if ((lastServerChar == "&") || (lastServerChar == "?")) {
- requestString = server + paramsString;
- } else {
- if (server.indexOf('?') == -1) {
- //serverPath has no ? -- add one
- requestString = server + '?' + paramsString;
- } else {
- //serverPath contains ?, so must already have paramsString at the end
- requestString = server + '&' + paramsString;
- }
- }
- return requestString;
- },
-
- /** go through and remove all tiles from the grid, calling
- * destroy() on each of them to kill circular references
- *
- * @private
- */
- clearGrid:function() {
- if (this.grid) {
- while(this.grid.length > 0) {
- var row = this.grid[0];
- while(row.length > 0) {
- var tile = row[0];
- tile.destroy();
- row.remove(tile);
- }
- this.grid.remove(row);
- }
- }
- },
-
- /**
- * addTile gives subclasses of Grid the opportunity to create an
- * OpenLayer.Tile of their choosing. The implementer should initialize
- * the new tile and take whatever steps necessary to display it.
- *
- * @param {OpenLayers.Bounds} bounds
- *
- * @returns The added OpenLayers.Tile
- * @type OpenLayers.Tile
- */
- addTile:function(bounds,position) {
- // Should be implemented by subclasses
- },
-
- /** @final @type String */
- CLASS_NAME: "OpenLayers.Grid"
-});
projects / rails.git / blobdiff