CartoDB-SQL-API/test/acceptance/export/topojson.js

require('../../helper');
require('../../support/assert');


var app    = require(global.settings.app_root + '/app/controllers/app')
    , assert = require('assert')
    , querystring = require('querystring')
    , _ = require('underscore')
    , zipfile = require('zipfile')
    , fs      = require('fs')
    , libxmljs = require('libxmljs')
    ;

// allow lots of emitters to be set to silence warning
app.setMaxListeners(0);


suite('export.topojson', function() {

// TOPOJSON tests

test('GET two polygons sharing an edge as topojson', function(done){
    assert.response(app, {
        url: '/api/v1/sql?' + querystring.stringify({
          q: "SELECT 1 as cartodb_id, 'POLYGON((-5 0,5 0,0 5,-5 0))'::geometry as the_geom " +
             " UNION ALL " +
             "SELECT 2 as cartodb_id, 'POLYGON((0 -5,0 5,-5 0,0 -5))'::geometry as the_geom ",
          format: 'topojson'
        }),
        headers: {host: 'vizzuality.cartodb.com'},
        method: 'GET'
    },{ }, function(res){
        assert.equal(res.statusCode, 200, res.body);
        var cd = res.header('Content-Disposition');
        assert.equal(true, /^attachment/.test(cd), 'TOPOJSON is not disposed as attachment: ' + cd);
        assert.equal(true, /filename=cartodb-query.topojson/gi.test(cd));
        var topojson = JSON.parse(res.body);
        assert.equal(topojson.type, 'Topology');
        
        // Check transform
        assert.ok(topojson.hasOwnProperty('transform'));
        var trans = topojson.transform;
        assert.equal(_.keys(trans).length, 2); // only scale and translate
        assert.equal(trans.scale.length, 2); // scalex, scaley
        assert.equal(Math.round(trans.scale[0]*1e6), 1000); 
        assert.equal(Math.round(trans.scale[1]*1e6), 1000);
        assert.equal(trans.translate.length, 2); // translatex, translatey
        assert.equal(trans.translate[0], -5);
        assert.equal(trans.translate[1], -5);

        // Check objects
        assert.ok(topojson.hasOwnProperty('objects'));
        assert.equal(_.keys(topojson.objects).length, 2);
        var obj = topojson.objects[0];
        //console.dir(obj);
        // Expected: { type: 'Polygon', arcs: [ [ 0, 1 ] ] }
        assert.equal(_.keys(obj).length, 2); // only type and arcs, no props
        assert.equal(obj.type, 'Polygon');
        assert.equal(obj.arcs.length, 1); /* only shell, no holes */
        var shell = obj.arcs[0];
        assert.equal(shell.length, 2); /* one shared arc, one non-shared */
        assert.equal(shell[0], 0); /* shared arc */
        assert.equal(shell[1], 1); /* non-shared arc */
        obj = topojson.objects[1];
        //console.dir(obj);
        // Expected: { type: 'Polygon', arcs: [ [ 0, 2 ] ] }
        assert.equal(_.keys(obj).length, 2); // only type and arcs, no props
        assert.equal(obj.type, 'Polygon');
        assert.equal(obj.arcs.length, 1); /* only shell, no holes */
        shell = obj.arcs[0];
        assert.equal(shell.length, 2); /* one shared arc, one non-shared */
        assert.equal(shell[0], 0); /* shared arc */
        assert.equal(shell[1], 2); /* non-shared arc */

        // Check arcs
        assert.ok(topojson.hasOwnProperty('arcs'));
        assert.equal(topojson.arcs.length, 3); // one shared, two non-shared 
        var arc = topojson.arcs[0]; // shared arc
        assert.equal(arc.length, 2); // shared arc has two vertices
        var p = arc[0];
        assert.equal(Math.round(p[0]*trans.scale[0]), 0); 
        assert.equal(Math.round(p[1]*trans.scale[1]), 5); 
        p = arc[1];
        assert.equal(Math.round(p[0]*trans.scale[0]), 5); 
        assert.equal(Math.round(p[1]*trans.scale[1]), 5); 
        arc = topojson.arcs[1]; // non shared arc
        assert.equal(arc.length, 3); // non shared arcs have three vertices
        p = arc[0];
        assert.equal(Math.round(p[0]*trans.scale[0]), 5); 
        assert.equal(Math.round(p[1]*trans.scale[1]), 10); 
        p = arc[1];
        assert.equal(Math.round(p[0]*trans.scale[0]), 5); 
        assert.equal(Math.round(p[1]*trans.scale[1]), -5); 
        p = arc[2];
        assert.equal(Math.round(p[0]*trans.scale[0]), -10); 
        assert.equal(Math.round(p[1]*trans.scale[1]), 0); 
        arc = topojson.arcs[2]; // non shared arc
        assert.equal(arc.length, 3); // non shared arcs have three vertices
        p = arc[0];
        assert.equal(Math.round(p[0]*trans.scale[0]), 5); 
        assert.equal(Math.round(p[1]*trans.scale[1]), 10); 
        p = arc[1];
        assert.equal(Math.round(p[0]*trans.scale[0]), 0); 
        assert.equal(Math.round(p[1]*trans.scale[1]), -10); 
        p = arc[2];
        assert.equal(Math.round(p[0]*trans.scale[0]), -5); 
        assert.equal(Math.round(p[1]*trans.scale[1]), 5); 

        done();
    });
});

});