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var width = 960,
height = 500;
var color = d3.scale.category20();
var d3cola = cola.d3adaptor()
.avoidOverlaps(true)
.size([width, height]);
jQuery(function () {
draw_graph();
});
function draw_graph () {
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("test.json", function (error, graph) {
var nodeRadius = 5;
graph.nodes.forEach(function (v) { v.height = v.width = 2 * nodeRadius; });
d3cola
.nodes(graph.nodes)
.links(graph.links)
.flowLayout("y", 30)
.symmetricDiffLinkLengths(6)
.start(10,20,20);
// define arrow markers for graph links
svg.append('svg:defs').append('svg:marker')
.attr('id', 'end-arrow')
.attr('viewBox', '0 -5 10 10')
.attr('refX', 6)
.attr('markerWidth', 3)
.attr('markerHeight', 3)
.attr('orient', 'auto')
.append('svg:path')
.attr('d', 'M0,-5L10,0L0,5')
.attr('fill', '#000');
var path = svg.selectAll(".link")
.data(graph.links)
.enter().append('svg:path')
.attr('class', 'link');
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", nodeRadius)
.style("fill", function (d) { return color(d.group); })
.call(d3cola.drag);
node.append("title")
.text(function (d) { return d.name; });
d3cola.on("tick", function () {
path.each(function (d) {
if (isIE()) this.parentNode.insertBefore(this, this);
});
// draw directed edges with proper padding from node centers
path.attr('d', function (d) {
var deltaX = d.target.x - d.source.x,
deltaY = d.target.y - d.source.y,
dist = Math.sqrt(deltaX * deltaX + deltaY * deltaY),
normX = deltaX / dist,
normY = deltaY / dist,
sourcePadding = nodeRadius,
targetPadding = nodeRadius + 2,
sourceX = d.source.x + (sourcePadding * normX),
sourceY = d.source.y + (sourcePadding * normY),
targetX = d.target.x - (targetPadding * normX),
targetY = d.target.y - (targetPadding * normY);
return 'M' + sourceX + ',' + sourceY + 'L' + targetX + ',' + targetY;
});
node.attr("cx", function (d) { return d.x; })
.attr("cy", function (d) { return d.y; });
});
// turn on overlap avoidance after first convergence
//cola.on("end", function () {
// if (!cola.avoidOverlaps()) {
// graph.nodes.forEach(function (v) {
// v.width = v.height = 10;
// });
// cola.avoidOverlaps(true);
// cola.start();
// }
//});
});
}
function isIE() {
return (navigator.appName == 'Microsoft Internet Explorer') ||
((navigator.appName == 'Netscape') &&
(new RegExp("Trident/.*rv:([0-9]{1,}[\.0-9]{0,})").exec(navigator.userAgent)
!= null));
}
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