maplibre-gl/src/data/load_geometry.test.ts

BSD licensed community fork of mapbox-gl, a WebGL interactive maps library

import fs from 'fs';
import path from 'path';
import Protobuf from 'pbf';
import {VectorTile} from '@mapbox/vector-tile';
import loadGeometry from './load_geometry';

// Load a line feature from fixture tile.
const vt = new VectorTile(new Protobuf(fs.readFileSync(path.resolve(__dirname, '../../test/unit/assets/mbsv5-6-18-23.vector.pbf'))));

describe('loadGeometry', () => {
    test('loadGeometry', () => {
        const feature = vt.layers.road.feature(0);
        const originalGeometry = feature.loadGeometry();
        const scaledGeometry = loadGeometry(feature);
        expect(scaledGeometry[0][0].x).toBe(originalGeometry[0][0].x * 2);
        expect(scaledGeometry[0][0].y).toBe(originalGeometry[0][0].y * 2);
    });

    test('loadGeometry warns and clamps when exceeding extent', () => {
        const feature = vt.layers.road.feature(0);
        feature.extent = 2048;

        let numWarnings = 0;

        // Use a custom console.warn to count warnings
        const warn = console.warn;
        console.warn = function(warning) {
            if (warning.match(/Geometry exceeds allowed extent, reduce your vector tile buffer size/)) {
                numWarnings++;
            }
        };

        const lines = loadGeometry(feature);

        expect(numWarnings).toBe(1);

        let maxValue = -Infinity;
        for (const line of lines) {
            for (const {x, y} of line) {
                maxValue = Math.max(x, y, maxValue);
            }
        }
        expect(maxValue).toBe(16383);

        // Put it back
        console.warn = warn;

    });
});