tethys-feature-service/node_modules/proj4/lib/core.js

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2023-10-02 13:04:02 +00:00
import proj from './Proj';
import transform from './transform';
var wgs84 = proj('WGS84');
function transformer(from, to, coords, enforceAxis) {
var transformedArray, out, keys;
if (Array.isArray(coords)) {
transformedArray = transform(from, to, coords, enforceAxis) || {x: NaN, y: NaN};
if (coords.length > 2) {
if ((typeof from.name !== 'undefined' && from.name === 'geocent') || (typeof to.name !== 'undefined' && to.name === 'geocent')) {
if (typeof transformedArray.z === 'number') {
return [transformedArray.x, transformedArray.y, transformedArray.z].concat(coords.splice(3));
} else {
return [transformedArray.x, transformedArray.y, coords[2]].concat(coords.splice(3));
}
} else {
return [transformedArray.x, transformedArray.y].concat(coords.splice(2));
}
} else {
return [transformedArray.x, transformedArray.y];
}
} else {
out = transform(from, to, coords, enforceAxis);
keys = Object.keys(coords);
if (keys.length === 2) {
return out;
}
keys.forEach(function (key) {
if ((typeof from.name !== 'undefined' && from.name === 'geocent') || (typeof to.name !== 'undefined' && to.name === 'geocent')) {
if (key === 'x' || key === 'y' || key === 'z') {
return;
}
} else {
if (key === 'x' || key === 'y') {
return;
}
}
out[key] = coords[key];
});
return out;
}
}
function checkProj(item) {
if (item instanceof proj) {
return item;
}
if (item.oProj) {
return item.oProj;
}
return proj(item);
}
function proj4(fromProj, toProj, coord) {
fromProj = checkProj(fromProj);
var single = false;
var obj;
if (typeof toProj === 'undefined') {
toProj = fromProj;
fromProj = wgs84;
single = true;
} else if (typeof toProj.x !== 'undefined' || Array.isArray(toProj)) {
coord = toProj;
toProj = fromProj;
fromProj = wgs84;
single = true;
}
toProj = checkProj(toProj);
if (coord) {
return transformer(fromProj, toProj, coord);
} else {
obj = {
forward: function (coords, enforceAxis) {
return transformer(fromProj, toProj, coords, enforceAxis);
},
inverse: function (coords, enforceAxis) {
return transformer(toProj, fromProj, coords, enforceAxis);
}
};
if (single) {
obj.oProj = toProj;
}
return obj;
}
}
export default proj4;