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64 lines
2.3 KiB
JavaScript
64 lines
2.3 KiB
JavaScript
/**
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* @module ol/proj/transforms
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*/
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import { isEmpty } from '../obj.js';
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/**
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* @private
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* @type {!Object<string, Object<string, import("../proj.js").TransformFunction>>}
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*/
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var transforms = {};
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/**
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* Clear the transform cache.
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*/
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export function clear() {
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transforms = {};
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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 {import("./Projection.js").default} source Source.
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* @param {import("./Projection.js").default} destination Destination.
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* @param {import("../proj.js").TransformFunction} transformFn Transform.
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*/
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export function add(source, destination, transformFn) {
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var sourceCode = source.getCode();
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var destinationCode = destination.getCode();
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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 {import("./Projection.js").default} source Source projection.
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* @param {import("./Projection.js").default} destination Destination projection.
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* @return {import("../proj.js").TransformFunction} transformFn The unregistered transform.
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*/
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export function remove(source, destination) {
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var sourceCode = source.getCode();
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var destinationCode = destination.getCode();
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var transform = transforms[sourceCode][destinationCode];
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delete transforms[sourceCode][destinationCode];
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if (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 {import("../proj.js").TransformFunction|undefined} The transform function (if found).
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*/
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export function get(sourceCode, destinationCode) {
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var transform;
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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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//# sourceMappingURL=transforms.js.map
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