js/graf.js

window.addEventListener("load", initGraf);

// s is the sigma graph
// graf is the JSON graph
var s, graf;

// query dario JSON for the graph information
function xhr(method, url, params, callback) {
	var http = new XMLHttpRequest();
	if (method == "POST") {
		http.open(method, url, true);
	} else {
		if (params != "") {
			http.open(method, url+"?"+params, true);
		} else {
			http.open(method, url, true);
		}
	}
	http.onload = function() {
		if(this.status != 200) {
			console.warn("Attention, status code "+this.status+" when loading via xhr url "+url);
		}
		callback(this.responseText, this.status);
	};
	if (method == "POST") {
		http.setRequestHeader("Content-type","application/x-www-form-urlencoded");
		http.send(params);
	} else {
		http.send();
	}
}


function initGraf() {
	// create new methods for sigma library
	updateSigma();
	
	// create graf, s is the sigma graf
	s = new sigma({
		renderers: [{
			container: "graf",
			type: "webgl"
		}],
		settings: {
			defaultEdgeColor: "#fff",
			edgeColor: "default",
			defaultLabelColor: "#fff",
			autoRescale: false,
			zoomMax: 10,
			// enableEdgeHovering: true,
			font: "Roboto",
			labelThreshold: 5
		}
	});

	
	// query for JSON for graph data
	xhr("GET", "api.php", "action=getgraf", function(responseText, status) {
		// graf is the JSON data
		graf = JSON.parse(responseText);

		// does graf.nodes have a size attribute?
		var sizegraf = 0;
		for (var i in graf.nodes) {
			sizegraf++;
		}
		
		var nnode = 0;
		for (var i in graf.nodes) {
			var ncolor = null;
			
			if(graf.nodes[i].sex =="F") ncolor = "#d61c08";
			else if(graf.nodes[i].sex == "M") ncolor = "#0159aa";
			else ncolor = "#0ca80a";
			
			// post-processing for year corrections
			if(1970 < graf.nodes[i].year && graf.nodes[i].year < 2004) graf.nodes[i].year += 18;
			
			var newX = 5000*Math.cos( 2*Math.PI*nnode/sizegraf );
			var newY = 5000*Math.sin( 2*Math.PI*nnode/sizegraf );	
			
			s.graph.addNode({
				// we add color, originalColor, size, originalX..Y, circleX..Y atributes
				id: graf.nodes[i].id,
				year: graf.nodes[i].year,
				sex: graf.nodes[i].sex,
				label: graf.nodes[i].name,
				x: graf.nodes[i].x,
				y: graf.nodes[i].y, 
				circleX: newX,
				circleY: newY,
				originalX: graf.nodes[i].x,
				originalY: graf.nodes[i].y, 
				size: 10,
				color: ncolor,
				originalColor: ncolor
			});
			nnode++;
		}

		for (var i in graf.edges) {
			
			s.graph.addEdge({
				id: i,
				source: graf.edges[i].a,
				target: graf.edges[i].b,
				size: Math.min(4, Math.max((7/(2*Math.pow(20, 2)))*Math.pow(graf.edges[i].votes, 2) + 1/2, 0.5))
			});
		
		}

		s.bind('clickNode', function(e) {			
			var nodeId = e.data.node.id,
				toKeep = s.graph.neighbors(nodeId);
				// toKeep[nodeId] = e.data.node;
	
			s.graph.nodes().forEach(function(n) {
				if (toKeep[n.id] || n.id == nodeId) {
					n.color = n.originalColor;
				} else {
					n.color = '#333';
				}
			});

			s.graph.edges().forEach(function(e) {
				if ((e.source == nodeId || e.target == nodeId) && (toKeep[e.source] || toKeep[e.target])) {
					e.color = '#fff';
				} else {
					e.color = '#333';
				}
			});
			
			if (circleMode) {
				e.data.node.x = 0;
				e.data.node.y = 0;
				e.data.node.size = 30;
			}
			
			s.refresh();

			dialog.show(nodeId, toKeep);
		});


		s.refresh();
		initSearchBar();

		autocomplete(document.querySelector("#search-input"), graf.nodes, "search");
	});
}

function updateSigma() {
	// returns set of neighouts
	sigma.classes.graph.addMethod("neighbors", function(nodeId) {
		var k,
		neighbors = {},
		index = this.allNeighborsIndex[nodeId] || [];

		for (k in index) {
			neighbors[k] = this.nodesIndex[k];
		}

		return neighbors;
	});
	
	// returns number of neighbours from a set of years
	sigma.classes.graph.addMethod("numNeighborsFromYears", function(nodeId, showYearsCopy) {
		var k,
		neighbors = 0,
		index = this.allNeighborsIndex[nodeId] || [];

		for (k in index) {
			if(this.nodesIndex){
				if (showYearsCopy.has("" + this.nodesIndex[k].year)) neighbors++;
				else if (this.nodesIndex[k].year == 0) neighbors++;
			}
		}
		
		return neighbors;
	});
}