mapbox-gl/js/data/load_geometry.js

A WebGL interactive maps library

'use strict';

var EXTENT = require('./buffer').EXTENT;

/**
 * Loads a geometry from a VectorTileFeature and scales it to the common extent
 * used internally.
 * @private
 */
module.exports = function loadGeometry(feature) {
    var scale = EXTENT / feature.extent;
    var geometry = feature.loadGeometry();
    for (var r = 0; r < geometry.length; r++) {
        var ring = geometry[r];
        for (var p = 0; p < ring.length; p++) {
            var point = ring[p];
            // round here because mapbox-gl-native uses integers to represent
            // points and we need to do the same to avoid renering differences.
            point.x = Math.round(point.x * scale);
            point.y = Math.round(point.y * scale);
        }
    }
    return geometry;
};