52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
/**
|
|
* @module ol/proj/proj4
|
|
*/
|
|
import {addCoordinateTransforms, addProjection, addEquivalentProjections, get} from '../proj.js';
|
|
import {get as getTransform} from './transforms.js';
|
|
import Projection from './Projection.js';
|
|
|
|
/**
|
|
* Make projections defined in proj4 (with `proj4.defs()`) available in
|
|
* OpenLayers.
|
|
*
|
|
* This function should be called whenever changes are made to the proj4
|
|
* registry, e.g. after calling `proj4.defs()`. Existing transforms will not be
|
|
* modified by this function.
|
|
*
|
|
* @param {?} proj4 Proj4.
|
|
* @api
|
|
*/
|
|
export function register(proj4) {
|
|
var projCodes = Object.keys(proj4.defs);
|
|
var len = projCodes.length;
|
|
var i, j;
|
|
for (i = 0; i < len; ++i) {
|
|
var code = projCodes[i];
|
|
if (!get(code)) {
|
|
var def = proj4.defs(code);
|
|
addProjection(new Projection({
|
|
code: code,
|
|
axisOrientation: def.axis,
|
|
metersPerUnit: def.to_meter,
|
|
units: def.units
|
|
}));
|
|
}
|
|
}
|
|
for (i = 0; i < len; ++i) {
|
|
var code1 = projCodes[i];
|
|
var proj1 = get(code1);
|
|
for (j = 0; j < len; ++j) {
|
|
var code2 = projCodes[j];
|
|
var proj2 = get(code2);
|
|
if (!getTransform(code1, code2)) {
|
|
if (proj4.defs[code1] === proj4.defs[code2]) {
|
|
addEquivalentProjections([proj1, proj2]);
|
|
} else {
|
|
var transform = proj4(code1, code2);
|
|
addCoordinateTransforms(proj1, proj2, transform.forward, transform.inverse);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|