107 lines
2.8 KiB
JavaScript
107 lines
2.8 KiB
JavaScript
import {D2R, R2D, PJD_3PARAM, PJD_7PARAM, PJD_GRIDSHIFT} from './constants/values';
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import datum_transform from './datum_transform';
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import adjust_axis from './adjust_axis';
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import proj from './Proj';
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import toPoint from './common/toPoint';
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import checkSanity from './checkSanity';
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function checkNotWGS(source, dest) {
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return (
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(source.datum.datum_type === PJD_3PARAM || source.datum.datum_type === PJD_7PARAM || source.datum.datum_type === PJD_GRIDSHIFT) && dest.datumCode !== 'WGS84') ||
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((dest.datum.datum_type === PJD_3PARAM || dest.datum.datum_type === PJD_7PARAM || dest.datum.datum_type === PJD_GRIDSHIFT) && source.datumCode !== 'WGS84');
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}
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export default function transform(source, dest, point, enforceAxis) {
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var wgs84;
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if (Array.isArray(point)) {
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point = toPoint(point);
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} else {
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// Clone the point object so inputs don't get modified
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point = {
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x: point.x,
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y: point.y,
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z: point.z,
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m: point.m
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};
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}
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var hasZ = point.z !== undefined;
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checkSanity(point);
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// Workaround for datum shifts towgs84, if either source or destination projection is not wgs84
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if (source.datum && dest.datum && checkNotWGS(source, dest)) {
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wgs84 = new proj('WGS84');
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point = transform(source, wgs84, point, enforceAxis);
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source = wgs84;
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}
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// DGR, 2010/11/12
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if (enforceAxis && source.axis !== 'enu') {
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point = adjust_axis(source, false, point);
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}
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// Transform source points to long/lat, if they aren't already.
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if (source.projName === 'longlat') {
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point = {
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x: point.x * D2R,
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y: point.y * D2R,
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z: point.z || 0
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};
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} else {
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if (source.to_meter) {
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point = {
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x: point.x * source.to_meter,
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y: point.y * source.to_meter,
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z: point.z || 0
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};
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}
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point = source.inverse(point); // Convert Cartesian to longlat
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if (!point) {
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return;
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}
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}
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// Adjust for the prime meridian if necessary
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if (source.from_greenwich) {
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point.x += source.from_greenwich;
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}
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// Convert datums if needed, and if possible.
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point = datum_transform(source.datum, dest.datum, point);
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if (!point) {
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return;
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}
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// Adjust for the prime meridian if necessary
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if (dest.from_greenwich) {
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point = {
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x: point.x - dest.from_greenwich,
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y: point.y,
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z: point.z || 0
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};
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}
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if (dest.projName === 'longlat') {
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// convert radians to decimal degrees
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point = {
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x: point.x * R2D,
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y: point.y * R2D,
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z: point.z || 0
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};
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} else { // else project
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point = dest.forward(point);
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if (dest.to_meter) {
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point = {
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x: point.x / dest.to_meter,
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y: point.y / dest.to_meter,
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z: point.z || 0
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};
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}
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}
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// DGR, 2010/11/12
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if (enforceAxis && dest.axis !== 'enu') {
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return adjust_axis(dest, true, point);
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}
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if (!hasZ) {
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delete point.z;
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}
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return point;
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}
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