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Very raw implementation of SubstitutionTokens based on origin data

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This commit is contained in:
Raul Ochoa 2016-05-19 12:13:49 +02:00
parent fd3f928d81
commit ee94b8a587
1 changed files with 36 additions and 2 deletions
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38
lib/cartodb/utils/style/turbo-carto-adapter.js
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@ -1,5 +1,7 @@
'use strict';
var dot = require('dot');
dot.templateSettings.strip = false;
var queue = require('queue-async');
var SubstitutionTokens = require('../substitution-tokens');
@ -31,17 +33,49 @@ TurboCartoAdapter.prototype.getLayers = function (username, layers, callback) {
});
};
var bboxTemplate = dot.template('(select ST_SetSRID(st_extent(the_geom_webmercator), 3857) from ({{=it._sql}}) __c)');
var zoomTemplate = dot.template([
'GREATEST(',
'ceil(log(40075017000 / 256 / GREATEST(',
' st_xmax({{=it._bbox}}) - st_xmin({{=it._bbox}}),',
' st_ymax({{=it._bbox}}) - st_ymin({{=it._bbox}})',
'))/log(2)),',
'0',
')'
].join('\n'));
var pixelSizeTemplate = dot.template('40075017 * cos(ST_Y(ST_Centroid({{=it._bbox}}))) / 2 ^ (({{=it._zoom}}) + 8)');
var scaleDenominatorTemplate = dot.template('({{=it._pixelSize}} / 0.00028)::numeric');
TurboCartoAdapter.prototype._parseCartoCss = function (username, layer, callback) {
if (!shouldParseLayerCartocss(layer)) {
return callback(null, layer);
}
var sql = SubstitutionTokens.replace(layer.options.sql, {
var tokens = {
bbox: 'ST_MakeEnvelope(-20037508.34,-20037508.34,20037508.34,20037508.34,3857)',
scale_denominator: '500000001',
pixel_width: '156412',
pixel_height: '156412'
});
};
var layerSql = layer.options.sql;
var layerRawSql = layer.options.sql_raw;
if (SubstitutionTokens.hasTokens(layerSql) && layerRawSql) {
var bbox = bboxTemplate({ _sql: layerRawSql });
var zoom = zoomTemplate({ _bbox: bbox });
var pixelSize = pixelSizeTemplate({ _bbox: bbox, _zoom: zoom });
var scaleDenominator = scaleDenominatorTemplate({ _pixelSize: pixelSize });
tokens = {
bbox: bbox,
scale_denominator: scaleDenominator,
pixel_width: pixelSize,
pixel_height: pixelSize
};
}
var sql = SubstitutionTokens.replace(layerSql, tokens);
this.turboCartoParser.process(username, layer.options.cartocss, sql, function (err, cartocss) {
// Only return turbo-carto errors