mapbox-gl/js/data/create_bucket.js

A WebGL interactive maps library

'use strict';

module.exports = createBucket;

var LineBucket = require('./line_bucket');
var FillBucket = require('./fill_bucket');
var SymbolBucket = require('./symbol_bucket');
var LayoutProperties = require('../style/layout_properties');
var featureFilter = require('feature-filter');
var StyleDeclarationSet = require('../style/style_declaration_set');

function createBucket(layer, buffers, z, overscaling, collisionDebug) {
    var values = new StyleDeclarationSet('layout', layer.type, layer.layout, {}).values(),
        fakeZoomHistory = { lastIntegerZoom: Infinity, lastIntegerZoomTime: 0, lastZoom: 0 },
        layout = {};

    for (var k in values) {
        layout[k] = values[k].calculate(z, fakeZoomHistory);
    }

    var BucketClass =
        layer.type === 'line' ? LineBucket :
        layer.type === 'fill' ? FillBucket :
        layer.type === 'symbol' ? SymbolBucket : null;

    var bucket = new BucketClass(buffers, new LayoutProperties[layer.type](layout), overscaling, z, collisionDebug);

    bucket.id = layer.id;
    bucket.type = layer.type;
    bucket['source-layer'] = layer['source-layer'];
    bucket.interactive = layer.interactive;
    bucket.minZoom = layer.minzoom;
    bucket.maxZoom = layer.maxzoom;
    bucket.filter = featureFilter(layer.filter);
    bucket.features = [];

    return bucket;
}