76 lines
2.8 KiB
Markdown
76 lines
2.8 KiB
Markdown
Torque
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==
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Render big, timeseries data in the client. Uses CartoDB to generate a datacube format. For a brief introduction to the format and methods, see our [presentation slides](http://gijs.github.com/images/cartodb_datacubes.pdf)
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CartoDB users can use this code right away. Specify your username/tablename and datecolumn to get mapping time immediatley.
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Have fun!
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* USPO creation over time: http://cartodb.github.com/torque/examples/uspo.html
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* OpenStreetMap edits in Madrid over time: http://cartodb.github.com/torque/examples/osm.html
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* The Guardian's Data Blog write-up of Royal Navy ships in WWI: http://www.guardian.co.uk/news/datablog/interactive/2012/oct/01/first-world-war-royal-navy-ships-mapped
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## Torque library reference
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Torque lets you render big, timeseries or categorical data in the client. This is useful for many modern applications that need more than just a static map. Early versions of Torque have been used to visualize human movement, Twitter activity, biodiversity data, and many more large-scale datasets.
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The library uses CartoDB to generate a [layercube]() format. For a brief introduction to the format and methods, see our [presentation slides](http://gijs.github.com/images/cartodb_datacubes.pdf). If you are not using CartoDB to host your data, you can modify the input parameters to point toward any layercube service.
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### Getting started
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The simplest way to use a visualization with Torque is...
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<div class="margin20"></div>
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<div class="code_title">Create a simple Torque visualization</div>
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``` javascript
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...
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<body>
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<div id="map"></div>
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</body>
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...
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<script>
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window.onload = function() {
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// Create a Leaflet map
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var map = new L.Map('map', {
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zoomControl: true,
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center: [40, 0],
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//center: [36.60670888641815, 38.627929687],
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zoom: 3
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});
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// Add a basemap, here we use one provided by Stamen
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L.tileLayer('http://tile.stamen.com/toner/{z}/{x}/{y}.png', {
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attribution: 'Stamen'
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}).addTo(map);
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// Add Torque visualization
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// - create the torqueLayer object
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// - add the torqueLayer to the map
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var torqueLayer = new L.TorqueLayer({
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provider: 'sql_api',
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user : 'viz2',
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table : 'ow',
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column : 'date',
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countby : 'count(cartodb_id)',
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resolution: 1,
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is_time: true,
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steps: 750,
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pixel_size: 4,
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blendmode : 'lighter'
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});
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torqueLayer.addTo(map);
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var t = 0;
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setInterval(function() {
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torqueLayer.setKey((t++%750));
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}, 100);
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}
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</script>
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```
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<div class="margin20"></div>
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[Grab the complete example source code](https://github.com/CartoDB/cartodb.js/blob/develop/examples/easy.html)
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