Merge pull request #290 from bbinet/projection_stuff

Add a getMetersPerUnit instance method to ol.Projection class
2013-03-06 08:50:47 -08:00
parent 388eac3838 1ff3c79ff6
commit d1762a06f8
2 changed files with 27 additions and 1 deletions
@@ -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
@@ -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.
 */