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Update to ol.proj

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Add support for custom getPointResolution
and setting the 'global' boolean
This commit is contained in:
bill-chadwick
2015-03-16 22:46:47 +00:00
parent 47f32a30b8
commit 3efea3ddfc
2 changed files with 69 additions and 11 deletions
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70
src/ol/proj/proj.js
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@@ -121,6 +121,13 @@ ol.proj.Projection = function(options) {
*/
this.global_ = goog.isDef(options.global) ? options.global : false;
/**
* @private
* @type {function(number, ol.Coordinate):number}
*/
this.getPointResolutionFunc_ = goog.isDef(options.getPointResolution) ?
options.getPointResolution : this.getPointResolution_;
/**
* @private
* @type {ol.tilegrid.TileGrid}
@@ -206,6 +213,16 @@ ol.proj.Projection.prototype.isGlobal = function() {
};
/**
* Set if the projection is a global projection which spans the whole world
* @param {boolean} global Whether the projection is global.
* @api stable
*/
ol.proj.Projection.prototype.setGlobal = function(global) {
this.global_ = global;
};
/**
* @return {ol.tilegrid.TileGrid} The default tile grid.
*/
@@ -244,16 +261,29 @@ ol.proj.Projection.prototype.setWorldExtent = function(worldExtent) {
/**
* Get the resolution of the point in degrees. For projections with degrees as
* the unit this will simply return the provided resolution. For other
* projections the point resolution is estimated by transforming the center
* pixel to EPSG:4326, measuring its width and height on the normal sphere,
* and taking the average of the width and height.
* @param {number} resolution Resolution.
* @param {ol.Coordinate} point Point.
* @return {number} Point resolution.
*/
ol.proj.Projection.prototype.getPointResolution = function(resolution, point) {
* Set the getPointResolution function for this projection.
* @param {function(number, ol.Coordinate):number} func Function
* @api
*/
ol.proj.Projection.prototype.setGetPointResolution = function(func) {
this.getPointResolutionFunc_ = func;
};
/**
* Default version.
* Get the resolution of the point in degrees or distance units.
* For projections with degrees as the unit this will simply return the
* provided resolution. For other projections the point resolution is
* estimated by transforming the 'point' pixel to EPSG:4326,
* measuring its width and height on the normal sphere,
* and taking the average of the width and height.
* @param {number} resolution Nominal resolution in projection units.
* @param {ol.Coordinate} point Point to find adjusted resolution at.
* @return {number} Point resolution at point in projection units.
* @private
*/
ol.proj.Projection.prototype.getPointResolution_ = function(resolution, point) {
var units = this.getUnits();
if (units == ol.proj.Units.DEGREES) {
return resolution;
@@ -284,6 +314,26 @@ ol.proj.Projection.prototype.getPointResolution = function(resolution, point) {
};
/**
* Get the resolution of the point in degrees or distance units.
* For projections with degrees as the unit this will simply return the
* provided resolution. The default for other projections is to estimate
* the point resolution by transforming the 'point' pixel to EPSG:4326,
* measuring its width and height on the normal sphere,
* and taking the average of the width and height.
* An alternative implementation may be given when constructing a
* projection. For many local projections,
* such a custom function will return the resolution unchanged.
* @param {number} resolution Resolution in projection units.
* @param {ol.Coordinate} point Point.
* @return {number} Point resolution in projection units.
* @api
*/
ol.proj.Projection.prototype.getPointResolution = function(resolution, point) {
return this.getPointResolutionFunc_(resolution, point);
};
/**
* @private
* @type {Object.<string, ol.proj.Projection>}