KaMap.js
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/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
* for the full text of the license. */
/**
* @class
*
* @requires OpenLayers/Layer/Grid.js
*/
OpenLayers.Layer.KaMap = OpenLayers.Class.create();
OpenLayers.Layer.KaMap.prototype =
OpenLayers.Class.inherit( OpenLayers.Layer.Grid, {
/** KaMap Layer is always a base layer
*
* @type Boolean
*/
isBaseLayer: true,
units: null,
resolution: OpenLayers.DOTS_PER_INCH,
DEFAULT_PARAMS: {
i: 'jpeg',
map: ''
},
initialize: function(name, url, params, options) {
var newArguments = new Array();
newArguments.push(name, url, params, options);
OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments);
this.params = (params ? params : {});
if (params) {
OpenLayers.Util.applyDefaults(
this.params,
this.DEFAULT_PARAMS
);
}
},
/**
* @param {OpenLayers.Bounds} bounds
*
* @returns A string with the layer's url and parameters and also the
* passed-in bounds and appropriate tile size specified as
* parameters
* @type String
*/
getURL: function (bounds) {
var mapRes = this.map.getResolution();
var scale = Math.round((this.map.getScale() * 10000)) / 10000;
var pX = Math.round(bounds.left / mapRes);
var pY = -Math.round(bounds.top / mapRes);
return this.getFullRequestString(
{ t: pY,
l: pX,
s: scale
});
},
addTile:function(bounds,position) {
var url = this.getURL(bounds);
return new OpenLayers.Tile.Image(this, position, bounds,
url, this.tileSize);
},
_initTiles:function() {
var viewSize = this.map.getSize();
var bounds = this.map.getExtent();
var extent = this.map.getMaxExtent();
var resolution = this.map.getResolution();
var tilelon = resolution*this.tileSize.w;
var tilelat = resolution*this.tileSize.h;
var offsetlon = bounds.left;
var tilecol = Math.floor(offsetlon/tilelon);
var tilecolremain = offsetlon/tilelon - tilecol;
var tileoffsetx = -tilecolremain * this.tileSize.w;
var tileoffsetlon = tilecol * tilelon;
var offsetlat = bounds.top;
var tilerow = Math.ceil(offsetlat/tilelat);
var tilerowremain = tilerow - offsetlat/tilelat;
var tileoffsety = -(tilerowremain+1) * this.tileSize.h;
var tileoffsetlat = 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;
var rowidx = 0;
do {
var row;
row = this.grid[rowidx++];
if (!row) {
row = new Array();
this.grid.push(row);
}
tileoffsetlon = startLon;
tileoffsetx = startX;
var colidx = 0;
do {
var tileBounds = new OpenLayers.Bounds(tileoffsetlon,
tileoffsetlat,
tileoffsetlon + tilelon,
tileoffsetlat + tilelat);
var x = tileoffsetx;
x -= parseInt(this.map.layerContainerDiv.style.left);
var y = tileoffsety;
y -= parseInt(this.map.layerContainerDiv.style.top);
var px = new OpenLayers.Pixel(x, y);
var tile;
tile = row[colidx++];
if (!tile) {
tile = this.addTile(tileBounds, px);
row.push(tile);
} else {
tile.moveTo(tileBounds, px, false);
}
tileoffsetlon += tilelon;
tileoffsetx += this.tileSize.w;
} while (tileoffsetlon <= bounds.right + tilelon * this.buffer)
tileoffsetlat -= tilelat;
tileoffsety += this.tileSize.h;
} while(tileoffsetlat >= bounds.bottom - tilelat * this.buffer)
this.spiralTileLoad();
},
/**
* @param {Object} obj
*
* @returns An exact clone of this OpenLayers.Layer.Grid
* @type OpenLayers.Layer.Grid
*/
clone: function (obj) {
if (obj == null) {
obj = new OpenLayers.Layer.KaMap(this.name,
this.url,
this.params,
this.options);
}
//get all additions from superclasses
obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]);
// copy/set any non-init, non-simple values here
if (this.tileSize != null) {
obj.tileSize = this.tileSize.clone();
}
// we do not want to copy reference to grid, so we make a new array
obj.grid = new Array();
return obj;
},
/** @final @type String */
CLASS_NAME: "OpenLayers.Layer.KaMap"
});