86 lines
3.4 KiB
Markdown
86 lines
3.4 KiB
Markdown
Torque
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==
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[](https://travis-ci.org/CartoDB/torque)
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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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* Play with your own data: http://cartodb.github.com/torque/
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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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* A car in Nürburgring track: http://cartodb.github.com/torque/examples/car.html
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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](https://github.com/CartoDB/tilecubes/blob/master/2.0/spec.md) 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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// define the torque layer style using cartocss
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var CARTOCSS = [
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'Map {',
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'-torque-time-attribute: "date";',
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'-torque-aggregation-function: "count(cartodb_id)";',
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'-torque-frame-count: 760;',
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'-torque-animation-duration: 15;',
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'-torque-resolution: 2',
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'}',
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'#layer {',
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' marker-width: 3;',
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' marker-fill-opacity: 0.8;',
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' marker-fill: #FEE391; ',
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' comp-op: "lighten";',
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' [value > 2] { marker-fill: #FEC44F; }',
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' [value > 3] { marker-fill: #FE9929; }',
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' [value > 4] { marker-fill: #EC7014; }',
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' [value > 5] { marker-fill: #CC4C02; }',
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' [value > 6] { marker-fill: #993404; }',
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' [value > 7] { marker-fill: #662506; }',
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' [frame-offset = 1] { marker-width: 10; marker-fill-opacity: 0.05;}',
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' [frame-offset = 2] { marker-width: 15; marker-fill-opacity: 0.02;}',
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'}'
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].join('\n');
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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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zoom: 3
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});
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L.tileLayer('http://{s}.api.cartocdn.com/base-dark/{z}/{x}/{y}.png', {
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attribution: 'CartoDB'
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}).addTo(map);
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var torqueLayer = new L.TorqueLayer({
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user : 'viz2',
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table : 'ow',
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cartocss: CARTOCSS
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});
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torqueLayer.addTo(map);
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torqueLayer.play()
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<script>
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```
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[Grab the complete example source code](https://github.com/CartoDB/torque/blob/master/examples/navy_leaflet.html)
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<div class="margin20"></div>
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### API
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[see reference](https://github.com/CartoDB/torque/blob/master/doc/API.md)
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