projection.test.js

"use strict";

var test = require('tape');
var mapnik = require('../');


test('should throw with invalid usage', (assert) => {
  assert.throws(function() { mapnik.Projection('+init=epsg:foo'); } );
  assert.throws(function() { new mapnik.Projection('+init=epsg:foo'); } );
  assert.throws(function() { new mapnik.Projection('+proj +foo'); } );
  assert.throws(function() { new mapnik.Projection(1); });
  assert.throws(function() { new mapnik.Projection({}); });
  assert.throws(function() { new mapnik.Projection('+init=epsg:3857', null); } );
  assert.throws(function() { new mapnik.Projection('+init=epsg:3857', {lazy:null}); } );
  assert.end();
});

test('should initialize properly', (assert) => {
  var wgs84 = new mapnik.Projection('+init=epsg:4326');
  assert.equal(wgs84 instanceof mapnik.Projection, true);

  var merc;
  try {
    // perhaps we've got a savvy user?
    merc = new mapnik.Projection('+init=epsg:900913');
  }
  catch (err) {
    // newer versions of proj4 have this code which is == 900913
    merc = new mapnik.Projection('+init=epsg:3857');
  }

  assert.equal(merc instanceof mapnik.Projection, true,
               'warning, could not create a spherical mercator projection ' +
               'with either epsg:900913 or epsg:3857, so they must be missing ' +
               'from your proj4 epsg table (/usr/local/share/proj/epsg)');

  var long_lat_coords = [-122.33517, 47.63752];
  assert.throws(function() { merc.forward() });
  assert.throws(function() { merc.forward(null) });
  assert.throws(function() { merc.forward([1,2,3]) });
  var merc_coords = merc.forward(long_lat_coords);

  assert.equal(merc_coords.length, 2);
  assert.notStrictEqual(merc_coords, [-13618288.8305, 6046761.54747]);
  assert.notStrictEqual(long_lat_coords, merc.inverse(merc.forward(long_lat_coords)));

  assert.throws(function() { merc.inverse(); });
  assert.throws(function() { merc.inverse(null); });
  assert.throws(function() { merc.inverse([1,2,3]); });

  var long_lat_bounds = [-122.420654, 47.605006, -122.2435, 47.67764];
  var merc_bounds = merc.forward(long_lat_bounds);

  assert.equal(merc_bounds.length, 4);
  var expected = [-13627804.8659, 6041391.68077, -13608084.1728, 6053392.19471];
  assert.notStrictEqual(merc_bounds, expected);
  assert.notStrictEqual(long_lat_bounds, merc.inverse(merc.forward(long_lat_bounds)));
  assert.end();
});

test('should fail some methods with an uninitialized projection', (assert) => {
  var wgs84 = new mapnik.Projection('+init=epsg:4326', {lazy : true});
  assert.equal(wgs84 instanceof mapnik.Projection, true);
  var long_lat_coords = [-122.33517, 47.63752];
  assert.throws(function() { wgs84.forward(long_lat_coords); });
  assert.throws(function() { wgs84.inverse(long_lat_coords); });
  assert.end();
});