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Merge pull request #290 from bbinet/projection_stuff

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Add a getMetersPerUnit instance method to ol.Projection class
This commit is contained in:
Bruno Binet
2013-03-06 08:50:47 -08:00
parent 388eac3838 1ff3c79ff6
commit d1762a06f8
2 changed files with 27 additions and 1 deletions
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18
src/ol/projection.js
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@@ -33,6 +33,16 @@ ol.ProjectionUnits = {
}; };
/**
* @const {Object.<ol.ProjectionUnits, number>} Meters per unit lookup table.
*/
ol.METERS_PER_UNIT = {};
ol.METERS_PER_UNIT[ol.ProjectionUnits.DEGREES] =
2 * Math.PI * ol.sphere.NORMAL.radius / 360;
ol.METERS_PER_UNIT[ol.ProjectionUnits.FEET] = 0.3048;
ol.METERS_PER_UNIT[ol.ProjectionUnits.METERS] = 1;
/** /**
* @constructor * @constructor
@@ -109,6 +119,14 @@ ol.Projection.prototype.getUnits = function() {
}; };
/**
* @return {number} Meters.
*/
ol.Projection.prototype.getMetersPerUnit = function() {
return ol.METERS_PER_UNIT[this.units_];
};
/** /**
* @return {string} Axis orientation. * @return {string} Axis orientation.
*/ */

10
test/spec/ol/projection.test.js
View File

@@ -221,7 +221,6 @@ describe('ol.projection', function() {
}); });
describe('ol.projection.getTransformFromCodes()', function() { describe('ol.projection.getTransformFromCodes()', function() {
it('returns a function', function() { it('returns a function', function() {
@@ -321,6 +320,15 @@ describe('ol.projection', function() {
}); });
describe('ol.Projection.prototype.getMetersPerUnit()', function() {
it('returns value in meters', function() {
var epsg4326 = ol.projection.getFromCode('EPSG:4326');
expect(epsg4326.getMetersPerUnit()).toEqual(111194.87428468118);
});
});
}); });
goog.require('goog.array'); goog.require('goog.array');