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index.html
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<!DOCTYPE html>
<meta charset="utf-8">
<head>
<style>
body {
margin: 0;
min-width: 800px;
min-height: 600px;
overflow-y: hidden;
overflow-x: hidden;
}
.node circle{
r: 5;
}
.label text{
font-family: "sans-serif";
font-weight: bold;
}
</style>
</head>
<body onresize="resize()"><script src="http://d3js.org/d3.v4.min.js" charset="utf-8"></script>
<script>
/* Magic numbers etc */
var width = innerWidth,
height = innerHeight;
// Colours (solarized)
var baseColours = ['#002b36', '#073642', '#586e75', '#657b83', '#839496', '#93a1a1', '#eee8d5', '#fdf6e3'],
highlightColours = ['#b58900', '#cb4b16', '#dc322f', '#d33682', '#6c71c4', '#268bd2', '#2aa198', '#859900', '#000000'];
var xSpacing = 40;
var ySpacing = 50;
var nodeSize = 10;
/* Behaviours */
// Zoom behaviour
var zoom = d3.zoom()
.scaleExtent([0.01, 10])
.on("zoom", zoomed);
// Drag behaviour
var drag = d3.drag()
.on("start", dragStarted)
.on("drag", dragged)
.on("end", dragEnded);
/* Basic containers */
// Place svg, set size
var graph = d3.select("body")
.style("background", baseColours[0])
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + 0 + "," + 0 + ")")
.call(zoom);
// Panning rectangle
var rect = graph.append("rect")
.attr("width", width)
.attr("height", height )
.style("fill", "none")
.style("pointer-events", "all");
var container = graph.append("g");
var labels = container.append("g")
.attr("class", "labels");
var mouseDown = 0;
/*
graph.append("defs").append("marker")
.attr({
"id":"arrow",
"viewBox":"0 -5 10 10",
"refX":5,
"refY":0,
"markerWidth":4,
"markerHeight":4,
"orient":"auto"
})
.append("path")
.attr("d", "M0,-5L10,0L0,5")
.attr("class","arrowHead");*/
var logicalGraph = {
nodes: [],
edges: []
};
var nodes,
edges;
/* Assumptions about this data:
*
* All nodes have unique hashes
* The DAG is connected
* Depth is the maximum path length to the root
*
* */
d3.json("http://localhost:1234/graph", function(error, data) {
if (error) throw error;
logicalGraph.nodes = [];
logicalGraph.edges = data.edges;
var currentLayer = data.nodes.filter(function isHead(node) { return node.depth == 0});
var visited = [currentLayer[0].hash];
var nextLayer = [];
var branches = [currentLayer[0].branch];
var x = 0;
while(currentLayer.length > 0){
currentLayer = currentLayer.sort(function (a, b) {
var ai = branches.indexOf(a.branch);
var bi = branches.indexOf(b.branch);
if(ai < bi) return -1;
if(ai > bi) return 1;
return 0;
});
for(var j = 0; j < currentLayer.length; j++){
var node = currentLayer[j];
//Set logical coords
//node.x = xSpacing*(x+1);
node.x = xSpacing*(branches.indexOf(node.branch)+1);
node.y = ySpacing*(node.depth+1);
x++;
// Store data in data
logicalGraph.nodes.push(node);
// Find all child nodes not already in the graph (for the next layer)
var outEdges = data.edges.filter(function (edge) { return edge.n1 == node.hash;});
for(var k = 0; k < outEdges.length; k++){
var candidateChild = data.nodes.find(function (node) {return node.hash == outEdges[k].n2});
// Check if already in the graph
var previouslyOccurs = false;
for(var l = 0; l < visited.length && !previouslyOccurs; l++){
if (visited[l] == candidateChild.hash)
previouslyOccurs = true;
}
// If not already in graph/next layer, push node to next layer queue
if(!previouslyOccurs && candidateChild.depth == node.depth+1) {
nextLayer.push(candidateChild);
visited.push(candidateChild.hash);
// Check branches
//noinspection JSUnresolvedVariable
if(branches.indexOf(candidateChild.branch) == -1)
{ //noinspection JSUnresolvedVariable
branches.push(candidateChild.branch);
}
}
}
}
currentLayer = nextLayer;
nextLayer = [];
x = 0;
}
for(var i = 0; i < branches.length; i++){
console.log(branches[i] + " " + i);
}
// Create edges
edges = container.append("g")
.attr("class", "edges")
.selectAll(".edge")
.data(logicalGraph.edges)
.enter().append("line")
.attr("class", "edge")
.attr("x1", function (d) {return logicalGraph.nodes.find(function (node) {return d.n1 == node.hash;}).x})
.attr("y1", function (d) {return logicalGraph.nodes.find(function (node) {return d.n1 == node.hash;}).y})
.attr("x2", function (d) {return logicalGraph.nodes.find(function (node) {return d.n2 == node.hash;}).x})
.attr("y2", function (d) {return logicalGraph.nodes.find(function (node) {return d.n2 == node.hash;}).y})
.attr("n1", function (d) {return d.n1})
.attr("n2", function (d) {return d.n2})
.attr("stroke", (function (d) {
return highlightColours[branches.indexOf(data.nodes.filter(function isTarget(node) {return node.hash == d.n2})[0].branch) % highlightColours.length];
}))
.attr("opacity", 0.6)
.attr("stroke-width", 3);
//.attr("marker-end", "url(#arrow");
// Create nodes
nodes = container.append("g")
.attr("class", "graph")
.selectAll("node")
.data(logicalGraph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", nodeSize)
.attr("cx", function(d) {return d.x;})
.attr("cy", function(d) {return d.y;})
.attr("fill", function (d) {
return highlightColours[branches.indexOf(d.branch) % highlightColours.length];
})
.call(drag)
.on("mouseover", function (d, i) {
d3.select(this).attr("stroke", baseColours[1])
.attr("stroke-width", "1.5px");
if(!mouseDown)
labels.append("text")
.attr("class", "label")
.attr("text-anchor", "middle")
.attr("x", d.x)
.attr("y", d.y + 25)
.text(d.hash.substring(0, 6) + "...")
.attr("node", i)
.attr("fill", baseColours[6])
.attr("font-family", "sans-serif")
.attr("font-weight", "bold")
.raise();
})
.on("mouseout", function () {
d3.select(this).attr("stroke-width", "0px");
// IMPORTANT - only 1 label can be present at once (I think)
if(!mouseDown)
labels.selectAll(".label").remove();
});
labels.raise();
});
function updateEdges () {
edges.attr("x1", function (d) {return logicalGraph.nodes.find(function (node) {return d.n1 == node.hash;}).x})
.attr("y1", function (d) {return logicalGraph.nodes.find(function (node) {return d.n1 == node.hash;}).y})
.attr("x2", function (d) {return logicalGraph.nodes.find(function (node) {return d.n2 == node.hash;}).x})
.attr("y2", function (d) {return logicalGraph.nodes.find(function (node) {return d.n2 == node.hash;}).y});
}
function resize() {
// Update size vars
width = innerWidth;
height = innerHeight;
// Update svg
d3.selectAll("svg")
.attr("width", width)
.attr("height", height);
// Update rect
rect.attr("width", width)
.attr("height", height);
}
function zoomed() {
container.attr("transform", d3.event.transform);
}
function dragStarted() {
d3.event.sourceEvent.stopPropagation();
labels.selectAll(".label")
.attr("visibility", "hidden");
mouseDown = 1;
}
function dragged(d) {
d3.select(this).attr("cx", d.x = d3.event.x)
.attr("cy", d.y = d3.event.y);
updateEdges();
}
function dragEnded(){
// Update label (only 1)
var index = labels.select(".label").attr("node");
labels.select(".label")
.attr("visibility", "visible")
.attr("x", logicalGraph.nodes[index].x)
.attr("y", logicalGraph.nodes[index].y+20);
mouseDown = 0;
}
</script></body>