ashatora/openlayers
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Respect XYZ source projection

Browse Source
This commit is contained in:
Tim Schaub
2014-08-18 23:03:33 -06:00
parent 63ad916ca7
commit e97f79b4ab
4 changed files with 81 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
src/ol/tilegrid/tilegrid.js
View File

@@ -9,6 +9,7 @@ goog.require('ol.TileRange');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.extent.Corner');
goog.require('ol.proj');
goog.require('ol.proj.METERS_PER_UNIT');
goog.require('ol.proj.Projection');
goog.require('ol.proj.Units');
@@ -415,26 +416,14 @@ ol.tilegrid.getForProjection = function(projection) {
*/
ol.tilegrid.createForExtent =
function(extent, opt_maxZoom, opt_tileSize, opt_corner) {
var maxZoom = goog.isDef(opt_maxZoom) ?
opt_maxZoom : ol.DEFAULT_MAX_ZOOM;
var tileSize = goog.isDef(opt_tileSize) ?
opt_tileSize : ol.DEFAULT_TILE_SIZE;
var corner = goog.isDef(opt_corner) ?
opt_corner : ol.extent.Corner.BOTTOM_LEFT;
var extentHeight = ol.extent.getHeight(extent);
var extentWidth = ol.extent.getWidth(extent);
var maxResolution = Math.max(
extentWidth / tileSize, extentHeight / tileSize);
var resolutions = new Array(maxZoom + 1);
for (var z = 0, zz = resolutions.length; z < zz; ++z) {
resolutions[z] = maxResolution / Math.pow(2, z);
}
var resolutions = ol.tilegrid.resolutionsFromExtent(
extent, opt_maxZoom, tileSize);
return new ol.tilegrid.TileGrid({
origin: ol.extent.getCorner(extent, corner),
@@ -445,7 +434,37 @@ ol.tilegrid.createForExtent =
/**
* @param {ol.proj.Projection} projection Projection.
* Create a resolutions array from an extent. A zoom factor of 2 is assumed.
* @param {ol.Extent} extent Extent.
* @param {number=} opt_maxZoom Maximum zoom level (default is
* ol.DEFAULT_MAX_ZOOM).
* @param {number=} opt_tileSize Tile size (default uses ol.DEFAULT_TILE_SIZE).
* @return {!Array.<number>} Resolutions array.
*/
ol.tilegrid.resolutionsFromExtent =
function(extent, opt_maxZoom, opt_tileSize) {
var maxZoom = goog.isDef(opt_maxZoom) ?
opt_maxZoom : ol.DEFAULT_MAX_ZOOM;
var height = ol.extent.getHeight(extent);
var width = ol.extent.getWidth(extent);
var tileSize = goog.isDef(opt_tileSize) ?
opt_tileSize : ol.DEFAULT_TILE_SIZE;
var maxResolution = Math.max(
width / tileSize, height / tileSize);
var length = maxZoom + 1;
var resolutions = new Array(length);
for (var z = 0; z < length; ++z) {
resolutions[z] = maxResolution / Math.pow(2, z);
}
return resolutions;
};
/**
* @param {ol.proj.ProjectionLike} projection Projection.
* @param {number=} opt_maxZoom Maximum zoom level (default is
* ol.DEFAULT_MAX_ZOOM).
* @param {number=} opt_tileSize Tile size (default uses ol.DEFAULT_TILE_SIZE).
@@ -455,12 +474,25 @@ ol.tilegrid.createForExtent =
*/
ol.tilegrid.createForProjection =
function(projection, opt_maxZoom, opt_tileSize, opt_corner) {
var extent = ol.tilegrid.extentFromProjection(projection);
return ol.tilegrid.createForExtent(
extent, opt_maxZoom, opt_tileSize, opt_corner);
};
/**
* Generate a tile grid extent from a projection. If the projection has an
* extent, it is used. If not, a global extent is assumed.
* @param {ol.proj.ProjectionLike} projection Projection.
* @return {ol.Extent} Extent.
*/
ol.tilegrid.extentFromProjection = function(projection) {
projection = ol.proj.get(projection);
var extent = projection.getExtent();
if (goog.isNull(extent)) {
var half = 180 * ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] /
projection.getMetersPerUnit();
extent = ol.extent.createOrUpdate(-half, -half, half, half);
}
return ol.tilegrid.createForExtent(
extent, opt_maxZoom, opt_tileSize, opt_corner);
return extent;
};