| 1 | const constrainFeatureMovement = require('./constrain_feature_movement');
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| 2 | const Constants = require('../constants');
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| 3 |
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| 4 | module.exports = function(features, delta) {
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| 5 | const constrainedDelta = constrainFeatureMovement(features.map(feature => feature.toGeoJSON()), delta);
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| 6 |
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| 7 | features.forEach(feature => {
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| 8 | const currentCoordinates = feature.getCoordinates();
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| 9 |
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| 10 | const moveCoordinate = (coord) => {
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| 11 | const point = {
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| 12 | lng: coord[0] + constrainedDelta.lng,
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| 13 | lat: coord[1] + constrainedDelta.lat
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| 14 | };
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| 15 | return [point.lng, point.lat];
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| 16 | };
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| 17 | const moveRing = (ring) => ring.map(coord => moveCoordinate(coord));
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| 18 | const moveMultiPolygon = (multi) => multi.map(ring => moveRing(ring));
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| 19 |
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| 20 | let nextCoordinates;
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| 21 | if (feature.type === Constants.geojsonTypes.POINT) {
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| 22 | nextCoordinates = moveCoordinate(currentCoordinates);
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| 23 | } else if (feature.type === Constants.geojsonTypes.LINE_STRING || feature.type === Constants.geojsonTypes.MULTI_POINT) {
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| 24 | nextCoordinates = currentCoordinates.map(moveCoordinate);
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| 25 | } else if (feature.type === Constants.geojsonTypes.POLYGON || feature.type === Constants.geojsonTypes.MULTI_LINE_STRING) {
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| 26 | nextCoordinates = currentCoordinates.map(moveRing);
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| 27 | } else if (feature.type === Constants.geojsonTypes.MULTI_POLYGON) {
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| 28 | nextCoordinates = currentCoordinates.map(moveMultiPolygon);
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| 29 | }
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| 30 |
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| 31 | feature.incomingCoords(nextCoordinates);
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| 32 | });
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| 33 | };
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