dc.graph/src/webworker_message.js

Graph visualizations integrated with crossfilter and dc.js

var _layouts;

function postResponse(event, layoutId) {
    return function() {
        var message = {
            response: event,
            layoutId: layoutId
        };
        message.args = Array.prototype.slice.call(arguments);
        postMessage(message);
    };
}

onmessage = function(e) {
    var args = e.data.args;
    switch(e.data.command) {
    case 'init':
        // find a function under dc_graph that has `scripts`
        var layout_name;
        for(var name in dc_graph) {
            if(typeof dc_graph[name] === 'function' && dc_graph[name].scripts)
                layout_name = name;
        }
        if(!_layouts) {
            _layouts = {};
            importScripts.apply(null, dc_graph[layout_name].scripts);
            if(dc_graph[layout_name].optional_scripts) {
                try {
                    importScripts.apply(null, dc_graph[layout_name].optional_scripts);
                }
                catch(xep) {
                    console.log(xep);
                }
            }
        }

        _layouts[args.layoutId] = dc_graph[layout_name]()
            .on('tick', postResponse('tick', args.layoutId))
            .on('start', postResponse('start', args.layoutId))
            .on('end', postResponse('end', args.layoutId))
            .init(args.options);
        break;
    case 'data':
        if(_layouts)
            _layouts[args.layoutId].data(args.graph, args.nodes, args.edges, args.clusters, args.constraints);
        break;
    case 'start':
        // if(args.initialOnly) {
        //     if(args.showLayoutSteps)
        //         _tick();
        //     _done();
        // }
        // else
        _layouts[args.layoutId].start();
        break;
    case 'stop':
        if(_layouts)
            _layouts[args.layoutId].stop();
        break;
    }
};