60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
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var Canvas = require('canvas');
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var request = require('request');
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var _ = require('underscore');
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var fs = require('fs');
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var torque = require('../../lib/torque/index');
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function getTile(jsonRelPath, cartocss, z, x, y, step, callback) {
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step = step || 0;
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var cartoCssOptions = torque.common.TorqueLayer.optionsFromCartoCSS(cartocss);
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var provider = new torque.providers.windshaft(_.extend({ no_fetch_map: true }, cartoCssOptions));
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var rendererOptions = _.extend({cartocss: cartocss}, cartoCssOptions, {
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canvasClass: Canvas,
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imageClass: Canvas.Image,
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setImageSrc: function(img, url, callback) {
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var requestOpts = {
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url: url,
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method: 'GET',
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encoding: null
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};
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request(requestOpts, function (err, response, body) {
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if (!err && response.statusCode === 200) {
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img.onload = function() {
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callback(null);
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};
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img.onerror = function() {
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callback(new Error('Could not load marker-file image: ' + url));
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};
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img.src = body;
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} else {
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callback(new Error('Could not load marker-file image: ' + url));
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}
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});
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},
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qualifyURL: function(url) {
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return url;
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}
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});
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var rows = JSON.parse(fs.readFileSync(__dirname + '/../fixtures/json/' + jsonRelPath));
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var canvas = new Canvas(256, 256);
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var pointRenderer = new torque.renderer.Point(canvas, rendererOptions);
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pointRenderer.renderTile(provider.proccessTile(rows, {x: x, y: y}, z), step, function(err) {
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if (err) {
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return callback(err, null);
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}
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pointRenderer.applyFilters();
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return callback(null, canvas);
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});
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}
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module.exports = {
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getTile: getTile
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};
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