81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
goog.provide('ol.proj.transforms');
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goog.require('ol');
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goog.require('ol.obj');
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/**
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* @private
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* @type {Object.<string, Object.<string, ol.TransformFunction>>}
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*/
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ol.proj.transforms.cache_ = {};
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/**
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* Clear the transform cache.
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*/
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ol.proj.transforms.clear = function() {
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ol.proj.transforms.cache_ = {};
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};
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/**
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* Registers a conversion function to convert coordinates from the source
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* projection to the destination projection.
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*
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* @param {ol.proj.Projection} source Source.
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* @param {ol.proj.Projection} destination Destination.
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* @param {ol.TransformFunction} transformFn Transform.
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*/
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ol.proj.transforms.add = function(source, destination, transformFn) {
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var sourceCode = source.getCode();
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var destinationCode = destination.getCode();
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var transforms = ol.proj.transforms.cache_;
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if (!(sourceCode in transforms)) {
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transforms[sourceCode] = {};
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}
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transforms[sourceCode][destinationCode] = transformFn;
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};
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/**
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* Unregisters the conversion function to convert coordinates from the source
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* projection to the destination projection. This method is used to clean up
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* cached transforms during testing.
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*
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* @param {ol.proj.Projection} source Source projection.
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* @param {ol.proj.Projection} destination Destination projection.
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* @return {ol.TransformFunction} transformFn The unregistered transform.
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*/
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ol.proj.transforms.remove = function(source, destination) {
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var sourceCode = source.getCode();
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var destinationCode = destination.getCode();
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var transforms = ol.proj.transforms.cache_;
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ol.DEBUG && console.assert(sourceCode in transforms,
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'sourceCode should be in transforms');
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ol.DEBUG && console.assert(destinationCode in transforms[sourceCode],
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'destinationCode should be in transforms of sourceCode');
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var transform = transforms[sourceCode][destinationCode];
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delete transforms[sourceCode][destinationCode];
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if (ol.obj.isEmpty(transforms[sourceCode])) {
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delete transforms[sourceCode];
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}
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return transform;
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};
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/**
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* Get a transform given a source code and a destination code.
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* @param {string} sourceCode The code for the source projection.
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* @param {string} destinationCode The code for the destination projection.
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* @return {ol.TransformFunction|undefined} The transform function (if found).
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*/
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ol.proj.transforms.get = function(sourceCode, destinationCode) {
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var transform;
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var transforms = ol.proj.transforms.cache_;
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if (sourceCode in transforms && destinationCode in transforms[sourceCode]) {
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transform = transforms[sourceCode][destinationCode];
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}
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return transform;
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};
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