| 1 | const Constants = require('../constants');
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| 2 |
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| 3 | module.exports = function(parent, startVertex, endVertex, map) {
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| 4 | const startCoord = startVertex.geometry.coordinates;
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| 5 | const endCoord = endVertex.geometry.coordinates;
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| 6 |
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| 7 |
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| 8 |
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| 9 | if (startCoord[1] > Constants.LAT_RENDERED_MAX ||
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| 10 | startCoord[1] < Constants.LAT_RENDERED_MIN ||
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| 11 | endCoord[1] > Constants.LAT_RENDERED_MAX ||
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| 12 | endCoord[1] < Constants.LAT_RENDERED_MIN) {
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| 13 | return null;
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| 14 | }
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| 15 |
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| 16 | const ptA = map.project([ startCoord[0], startCoord[1] ]);
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| 17 | const ptB = map.project([ endCoord[0], endCoord[1] ]);
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| 18 | const mid = map.unproject([ (ptA.x + ptB.x) / 2, (ptA.y + ptB.y) / 2 ]);
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| 19 |
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| 20 | return {
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| 21 | type: Constants.geojsonTypes.FEATURE,
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| 22 | properties: {
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| 23 | meta: Constants.meta.MIDPOINT,
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| 24 | parent: parent,
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| 25 | lng: mid.lng,
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| 26 | lat: mid.lat,
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| 27 | coord_path: endVertex.properties.coord_path
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| 28 | },
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| 29 | geometry: {
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| 30 | type: Constants.geojsonTypes.POINT,
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| 31 | coordinates: [mid.lng, mid.lat]
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| 32 | }
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| 33 | };
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| 34 | };
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