mapbox-gl/js/style/style_layer/symbol_style_layer.js

A WebGL interactive maps library

'use strict';

var util = require('../../util/util');
var StyleLayer = require('../style_layer');

function SymbolStyleLayer() {
    StyleLayer.apply(this, arguments);
}

module.exports = SymbolStyleLayer;

SymbolStyleLayer.prototype = util.inherit(StyleLayer, {
    getLayoutValue: function(name, globalProperties, featureProperties) {
        var value = StyleLayer.prototype.getLayoutValue.apply(this, arguments);
        if (value !== 'auto') {
            return value;
        }

        switch (name) {
        case 'text-rotation-alignment':
        case 'icon-rotation-alignment':
            return this.getLayoutValue('symbol-placement', globalProperties, featureProperties) === 'line' ? 'map' : 'viewport';
        case 'text-pitch-alignment':
            return this.getLayoutValue('text-rotation-alignment', globalProperties, featureProperties);
        default:
            return value;
        }
    }
});