77 lines
2.0 KiB
JavaScript
77 lines
2.0 KiB
JavaScript
/**
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* @module ol/proj/proj4
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*/
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import Projection from './Projection.js';
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import Units from './Units.js';
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import {
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addCoordinateTransforms,
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addEquivalentProjections,
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addProjection,
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createSafeCoordinateTransform,
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get,
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} from '../proj.js';
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import {assign} from '../obj.js';
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import {get as getTransform} from './transforms.js';
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/**
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* Make projections defined in proj4 (with `proj4.defs()`) available in
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* OpenLayers.
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*
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* This function should be called whenever changes are made to the proj4
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* registry, e.g. after calling `proj4.defs()`. Existing transforms will not be
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* modified by this function.
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*
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* @param {?} proj4 Proj4.
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* @api
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*/
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export function register(proj4) {
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const projCodes = Object.keys(proj4.defs);
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const len = projCodes.length;
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let i, j;
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for (i = 0; i < len; ++i) {
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const code = projCodes[i];
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if (!get(code)) {
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const def = proj4.defs(code);
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let units = def.units;
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if (!units && def.projName === 'longlat') {
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units = Units.DEGREES;
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}
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addProjection(
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new Projection({
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code: code,
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axisOrientation: def.axis,
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metersPerUnit: def.to_meter,
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units,
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})
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);
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}
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}
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for (i = 0; i < len; ++i) {
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const code1 = projCodes[i];
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const proj1 = get(code1);
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for (j = 0; j < len; ++j) {
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const code2 = projCodes[j];
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const proj2 = get(code2);
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if (!getTransform(code1, code2)) {
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const def1 = proj4.defs(code1);
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const def2 = proj4.defs(code2);
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if (def1 === def2) {
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addEquivalentProjections([proj1, proj2]);
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} else {
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// Reset axis because OpenLayers always uses x, y axis order
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const transform = proj4(
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assign({}, def1, {axis: undefined}),
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assign({}, def2, {axis: undefined})
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);
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addCoordinateTransforms(
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proj1,
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proj2,
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createSafeCoordinateTransform(proj1, proj2, transform.forward),
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createSafeCoordinateTransform(proj2, proj1, transform.inverse)
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);
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}
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}
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}
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}
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}
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