I was trying to get the sink nodes to align centrally in the vertical direction in d3 JS Sankey implementation. Toward the top it is (almost) properly aligned like this
Correct Alignment
but towards the bottom, the sink nodes are no longer centrally aligned when compared to their inputs
Wrong Alignment
Here's the code `
sankey.nodeWidth = function (_) {
if (!arguments.length) return nodeWidth;
nodeWidth = +_;
return sankey;
};
sankey.nodePadding = function (_) {
if (!arguments.length) return nodePadding;
nodePadding = +_;
return sankey;
};
sankey.nodes = function (_) {
if (!arguments.length) return nodes;
nodes = _;
return sankey;
};
sankey.links = function (_) {
if (!arguments.length) return links;
links = _;
return sankey;
};
sankey.size = function (_) {
if (!arguments.length) return size;
size = _;
return sankey;
};
sankey.layout = function (iterations) {
computeNodeLinks();
computeNodeValues();
computeNodeBreadths();
computeNodeDepths(iterations);
computeLinkDepths();
return sankey;
};
sankey.relayout = function () {
computeLinkDepths();
return sankey;
};
sankey.link = function () {
//Original value of 0.5
var curvature = 0.5;
function link(d) {
var x0 = d.source.x + d.source.dx,
x1 = d.target.x,
xi = d3.interpolateNumber(x0, x1),
x2 = xi(curvature),
x3 = xi(1 - curvature),
y0 = d.source.y + d.sy + d.dy / 2,
y1 = d.target.y + d.ty + d.dy / 2;
return "M" + x0 + "," + y0 + "C" + x2 + "," + y0 + " " + x3 + "," + y1 + " " + x1 + "," + y1;
}
link.curvature = function (_) {
if (!arguments.length) return curvature;
curvature = +_;
return link;
};
return link;
};
// Populate the sourceLinks and targetLinks for each node.
// Also, if the source and target are not objects, assume they are indices.
function computeNodeLinks() {
nodes.forEach(function (node) {
node.sourceLinks = [];
node.targetLinks = [];
});
links.forEach(function (link) {
var source = link.source,
target = link.target;
if (typeof source == "number")
source = link.source = nodes[link.source];
if (typeof target == "number")
target = link.target = nodes[link.target];
source.sourceLinks.push(link);
target.targetLinks.push(link);
});
}
// Compute the value (size) of each node by summing the associated links.
function computeNodeValues() {
nodes.forEach(function (node) {
node.value = 15;
//Original code
//node.value = Math.max(
// d3.sum(node.sourceLinks, value),
//d3.sum(node.targetLinks, value));
});
}
// Iteratively assign the breadth (x-position) for each node.
// Nodes are assigned the maximum breadth of incoming neighbors plus one;
// nodes with no incoming links are assigned breadth zero, while
// nodes with no outgoing links are assigned the maximum breadth.
function computeNodeBreadths() {
var remainingNodes = nodes,
nextNodes,
x = 0;
while (remainingNodes.length) {
nextNodes = [];
remainingNodes.forEach(function (node) {
node.x = x;
node.dx = nodeWidth;
node.sourceLinks.forEach(function (link) {
nextNodes.push(link.target);
});
});
remainingNodes = nextNodes;
//Original value of x+=1
x++;
}
//
moveSinksRight(x);
scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));
}
function moveSourcesRight() {
nodes.forEach(function (node) {
if (!node.targetLinks.length) {
node.x = d3.min(node.sourceLinks, function (d) {
return d.target.x;
}) - 1;
}
});
}
function moveSinksRight(x) {
nodes.forEach(function (node) {
if (!node.sourceLinks.length) {
node.x = x - 1;
}
});
}
function scaleNodeBreadths(kx) {
nodes.forEach(function (node) {
node.x *= kx;
});
}
function computeNodeDepths(iterations) {
var nodesByBreadth = d3.nest()
.key(function (d) {
return d.x;
})
.sortKeys(d3.ascending)
.entries(nodes)
.map(function (d) {
return d.values;
});
//
initializeNodeDepth();
resolveCollisions();
for (var alpha = 1; iterations > 0; --iterations) {
relaxRightToLeft(alpha *= .99);
resolveCollisions();
relaxLeftToRight(alpha);
resolveCollisions();
}
function initializeNodeDepth() {
var ky = d3.min(nodesByBreadth, function (nodes) {
return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
});
nodesByBreadth.forEach(function (nodes) {
nodes.forEach(function (node, i) {
node.y = i;
node.dy = node.value * ky;
});
});
links.forEach(function (link) {
link.dy = link.value * ky;
});
}
function relaxLeftToRight(alpha) {
nodesByBreadth.forEach(function (nodes, breadth) {
nodes.forEach(function (node) {
if (node.targetLinks.length) {
var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedSource(link) {
return center(link.source) * link.value;
}
}
function relaxRightToLeft(alpha) {
nodesByBreadth.slice().reverse().forEach(function (nodes) {
nodes.forEach(function (node) {
if (node.sourceLinks.length) {
var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedTarget(link) {
return center(link.target) * link.value;
}
}
function resolveCollisions() {
nodesByBreadth.forEach(function (nodes) {
var node,
dy,
y0 = 0,
n = nodes.length,
i;
// Push any overlapping nodes down.
nodes.sort(ascendingDepth);
for (i = 0; i < n; ++i) {
node = nodes[i];
dy = y0 - node.y;
//Make some changes here
//Originally there in code
if (dy > 0) node.y += dy;
y0 = node.y + node.dy + nodePadding;
}
// If the bottommost node goes outside the bounds, push it back up.
dy = y0 - nodePadding - size[1];
if (dy > 0) {
y0 = node.y -= dy;
// Push any overlapping nodes back up.
for (i = n - 2; i >= 0; --i) {
node = nodes[i];
dy = node.y + node.dy + nodePadding - y0;
if (dy > 0) node.y -= dy;
y0 = node.y;
}
}
});
}
function ascendingDepth(a, b) {
return a.y - b.y;
}
}
function computeLinkDepths() {
nodes.forEach(function (node) {
node.sourceLinks.sort(ascendingTargetDepth);
node.targetLinks.sort(ascendingSourceDepth);
});
nodes.forEach(function (node) {
var sy = 0,
ty = 0;
node.sourceLinks.forEach(function (link) {
link.sy = sy;
sy += link.dy;
});
node.targetLinks.forEach(function (link) {
link.ty = ty;
ty += link.dy;
});
});
function ascendingSourceDepth(a, b) {
return a.source.y - b.source.y;
}
function ascendingTargetDepth(a, b) {
return a.target.y - b.target.y;
}
}
function center(node) {
//return 0;
//Original code +node.dy/2
return node.y+node.dy/2 ;
// return node.y ;
}
function value(link) {
return link.value;
}
return sankey;
`
and here are the user parameters that are usually set
var units = "Widgets";
var VariableHeight = graphData.nodes.length*25; //Change to suit the needs of the
graph,
//reduce factor of 100 for sleeker design
var margin = {top: 10, right: 10, bottom: 10, left: 10},
//Original Values are 700 and 300, 2700 is definitely a dangerous value for width
width = 1200 - margin.left - margin.right,
height = VariableHeight - margin.top - margin.bottom;
var formatNumber = d3.format(",.0f"), // zero decimal places
format = function(d) { return formatNumber(d) + " " + units; },
color = d3.scale.category20();
// append the svg canvas to the html page
var svg = d3.select("#sankeyContainer").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
// Set the sankey diagram properties
var sankey = d3sankey()
.nodeWidth(36)
.nodePadding(40)
.size([width, height]);
//Changes to connect links to centre of nodes
//Original Value
//var path = sankey.link();
var path = d3.svg.diagonal()
.source(function(d) {
return {"x":d.source.y + d.source.dy / 2,
"y":d.source.x + sankey.nodeWidth()/2};
})
.target(function(d) {
return {"x":d.target.y + d.target.dy / 2,
"y":d.target.x + sankey.nodeWidth()/2};
})
.projection(function(d) { return [d.y, d.x]; });
// load the data
var graph = graphData;
sankey.nodes(graph.nodes)
.links(graph.links)
.layout(32);
// add in the links
var link = svg.append("g").selectAll(".link")
.data(graph.links)
.enter().append("path")
.attr("class", "link")
.attr("d", path)
.style("fill", "none")
.style("stroke", "black")
.style("stroke-opacity", ".1")
//.style("stroke-opacity", ".2")
.on("mouseover", function() { d3.select(this).style("stroke-opacity", ".4") } )
.on("mouseout", function() { d3.select(this).style("stroke-opacity", ".1") } )
.style("stroke-width", function (d) {
return 15;
//return Math.max(1, Math.sqrt(d.dy));
//Original value
//return Math.max(1, d.dy);
})
.sort(function (a, b) {
return b.dy - a.dy;
});
// add the link titles
link.append("title")
.text(function (d) {
return d.source.name + " → " + d.target.name + "\n" + format(d.value);
});
// add in the nodes
var node = svg.append("g").selectAll(".node")
.data(graph.nodes).enter().append("g").attr("class", "node")
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
}).on("click",function(d){
if (d3.event.defaultPrevented) {
document.getElementById("ErrorDisplay").innerHTML="";
return;}
document.getElementById("ErrorDisplay").innerHTML="You Have Clicked "+ d.name;
}).call(d3.behavior.drag().origin(function(d) {
return d;
}).on("dragstart", function() {
//Removing the following line's comment status will make nodes unclickable
//this.parentNode.appendChild(this);
}).on("drag", dragmove));
// add the rectangles for the nodes, Original Code
/*
node.append("rect")
.attr("height", function (d) {
//Changed to make sure all node heights are the same
//Original Value
//return d.dy;
return 15;
})
.attr("width", sankey.nodeWidth())
*/// add the circles for the nodes
node.append("circle")
.attr("cx", sankey.nodeWidth()/2)
.attr("cy", function (d) {
return d.dy/2;
})
.attr("r", function (d) {
return Math.sqrt(d.dy);
})
.style("fill", function (d) {
return d.color = color(d.name.replace(/ .*/, ""));
})
.style("fill-opacity", ".9")
.style("shape-rendering", "crispEdges")
.style("stroke", function (d) {
return d3.rgb(d.color).darker(2);
})
.append("title")
.text(function (d) {
return d.name + "\n" + format(d.value);
});
// add in the title for the nodes
node.append("text")
.attr("x", -6)
.attr("y", function (d) {
return d.dy / 2+15; //Original value of only d.dy/2
})
.attr("dy", ".35em")
.attr("text-anchor", "end")
.attr("text-shadow", "0 1px 0 #fff")
.attr("transform", null)
.text(function (d) {
return d.name;
})
.filter(function (d) {
return d.x < width / 2;
})
.attr("x", 6 + sankey.nodeWidth())
.attr("text-anchor", "start");
// the function for moving the nodes
function dragmove(d) {
d3.select(this).attr("transform",
"translate(" + (
d.x = Math.max(0, Math.min(width - d.dx, d3.event.x))) + "," + (
d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))) + ")");
sankey.relayout();
link.attr("d", path);
};
`
What I have tried until now
1) Make the center(node) function node return 0, which doesnt work out well
2) Tried removing +node.dy in the expression y0 = node.y + node.dy + nodePadding in nodes.sort, which results in the opposite happening, the bottom half is aligned, but the top alignment is out of order. How do I make the sink nodes align with the center of the corresponding source nodes?
Okay, I got it (quite by chance), in the relaxRightToLeft function, simply comment out the node.y += (y - center(node)) * alpha; line, which causes the sink nodes to misalign
Related
I am trying to reduce the size of the parent level inner and outer radius' when I click on one of its children nodes. You can view my current diagram here: https://jsfiddle.net/2heLd2b1/. As you can see, when a child node is clicked and the distorts to display the selected node and its path, the parent layers take up too much space. I am looking for any suggestions as to how I could reduce or shrink the parent nodes width.
ar width = 960,
height = 750,
radius = (Math.min(width, height) / 2) - 10;
var color = d3.scale.category20c();
var x = d3.scale.linear()
.range([0, 2 * Math.PI]);
var y = d3.scale.linear()
.range([0, radius]);
function percent(d) {
var percentage = (d.value / 956129) * 100;
return percentage.toFixed(2);
}
// var tip = d3.tip()
// .attr('class', 'd3-tip')
// .offset([-10, 0])
// .html(function(d) {
// return "<strong>" + d.name + "</strong> <span style='color:red'>" + percent(d) + "%</span>";
// })
var partition = d3.layout.partition()
// .value(function(d) { return d.size; });
.value(function(d) { return 1; });
var arc = d3.svg.arc()
.startAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x))); })
.endAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x + d.dx))); })
.innerRadius(function(d) { return Math.max(0, y(d.y)) })
.outerRadius(function(d) { return Math.max(0, y(d.y + d.dy)) })
.cornerRadius(function(d) { return 5;});
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
.append("g")
.classed("inner", true);
// svg.call(tip);
d3.json("flare.json", function(error, root) {
if (error) throw error;
var g = svg.selectAll("g")
.data(partition.nodes(root))
.enter().append("g");
path = g.append("path")
.attr("d", arc)
.attr('stroke', 'white')
.attr("fill", function(d) { return color((d.children ? d : d.parent).name); })
.on("click", magnify)
// .on('mouseover', tip.show)
// .on('mouseout', tip.hide)
.each(stash);
var text = g.append("text")
.attr("x", function(d) { return d.x; })
.attr("dx", "6") // margin
.attr("dy", ".35em") // vertical-align
.text(function(d) {
return d.name;
})
.attr('font-size', function(d) {
return '10px';
})
.attr("text-anchor", "middle")
.attr("transform", function(d) {
if (d.depth > 0) {
return "translate(" + arc.centroid(d) + ")" +
"rotate(" + getStartAngle(d) + ")";
} else {
return null;
}
})
.on("click", magnify);
var innerG = d3.selectAll("g.inner");
// Distort the specified node to 80% of its parent.
function magnify(node) {
// get and store parent sequence
var parentSequence = getAncestors(node)
text.transition().attr("opacity", 0);
spin(node);
// check if node has a parent. If so, iterate throught parentSequence and update the size of each node in the sequence
if (node.parent) {
for (var p = 0; p < parentSequence.length; p++) {
if (parent = parentSequence[p].parent) {
var parent,
x = parent.x,
k = 0.95;
parent.children.forEach(function(sibling) {
x += reposition(sibling, x, sibling === parentSequence[p]
? parent.dx * k / parentSequence[p].value
: parent.dx * (1 - k) / (parent.value - parentSequence[p].value));
});
} else {
reposition(parentSequence[p], 0, parentSequence[p].dx / parentSequence[p].value);
}
}
// if node does not have parent (center node) reset all values to original
} else {
if (parent = node.parent) {
var parent,
x = parent.x,
k = 0.95;
parent.children.forEach(function(sibling) {
x += reposition(sibling, x, sibling === node
? parent.dx * k / node.value
: parent.dx * (1 - k) / (parent.value - node.value));
});
} else {
reposition(node, 0, node.dx / node.value);
}
}
path.transition()
.duration(750)
.attrTween("d", arcTween)
.each("end", function(e, i) {
// check if the animated element's data e lies within the visible angle span given in node
if (e.x >= node.x && e.x < (node.x + node.dx)) {
// get a selection of the associated text element
var arcText = d3.select(this.parentNode).select("text");
// fade in the text element and recalculate positions
arcText.transition().duration(750)
.attr("opacity", 1)
.attr("x", function(d) {
return d.x;
})
.attr("transform", function(d) {
if (d.depth > 0) {
return "translate(" + arc.centroid(d) + ")" +
"rotate(" + getNewAngle(d) + ")";
} else {
return null;
}
});
}
});
}
function spin(d) {
var spin1 = new Promise (function(resolve, reject) {
var newAngle = - x(d.x + d.dx / 2);
// console.log('newAngle', newAngle)
innerG
.transition()
.duration(1500)
.attr("transform", "rotate(" + ((180 / Math.PI * newAngle)) + ")");
resolve("Success!");
});
spin1.then(function() {
var newerAngle = - x(d.x + d.dx / 2);
// console.log('newerAngle', newerAngle)
innerG
.transition()
.duration(1500)
.attr("transform", "rotate(" + ((180 / Math.PI * newerAngle)) + ")");
})
path
.classed("selected", function (x) { return d.name == x.name; });
}
// Recursively reposition the node at position x with scale k.
function reposition(node, x, k) {
// console.log(k)
node.x = x;
if (node.children && (n = node.children.length)) {
var i = -1, n;
while (++i < n) x += reposition(node.children[i], x, k);
}
return node.dx = node.value * k;
}
// Stash the old values for transition.
function stash(d) {
d.x0 = d.x;
d.dx0 = d.dx;
}
// Interpolate the arcs in data space.
function arcTween(a) {
var i = d3.interpolate({x: a.x0, dx: a.dx0}, a);
return function(t) {
var b = i(t);
a.x0 = b.x;
a.dx0 = b.dx;
return arc(b);
};
};
});
function getStartAngle(d) {
// Offset the angle by 90 deg since the '0' degree axis for arc is Y axis, while
// for text it is the X axis.
var thetaDeg = (180 / Math.PI * (arc.startAngle()(d) + arc.endAngle()(d)) / 2 - 90);
// If we are rotating the text by more than 90 deg, then "flip" it.
// This is why "text-anchor", "middle" is important, otherwise, this "flip" would
// a little harder.
return (thetaDeg > 90) ? thetaDeg - 180 : thetaDeg;
}
function getNewAngle(d) {
var thetaDeg = (180 / Math.PI * (arc.startAngle()(d) + arc.endAngle()(d)) / 2 - 90);
return (thetaDeg < 90) ? thetaDeg - 180 : thetaDeg;
}
function getAncestors(node) {
var path = [];
var current = node;
while (current.parent) {
path.unshift(current);
current = current.parent;
}
return path;
}
I managed to figure it out by combining the tween methods from my original jsFiddle link, https://jsfiddle.net/2heLd2b1/, with the traditional tween used by a zoomable sunburst.You can see the implementation here: https://jsfiddle.net/6e4y0s11/
I altered my innerRadius and outerRadius from:
var arc = d3.svg.arc()
.startAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x))); })
.endAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x + d.dx))); })
.innerRadius(function(d) { return Math.max(0, y(d.y)) })
.outerRadius(function(d) { return Math.max(0, y(d.y + d.dy)) })
.cornerRadius(function(d) { return 5;});
to:
var arc = d3.svg.arc()
.startAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x))); })
.endAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x + d.dx))); })
.innerRadius(function(d) { return Math.max(d.depth * 20, y(d.y)) })
.outerRadius(function(d) { return Math.max(100, y(d.y + d.dy)) })
.cornerRadius(function(d) { return 5;});
I also added:
function arcTweenZoom(d) {
var yd = d3.interpolate(y.domain(), [d.y, 1]),
yr = d3.interpolate(y.range(), [d.y ? 20 : 0, radius]);
return function(d, i) {
return i
? function(t) { return arc(d); }
: function(t) {
y.domain(yd(t)).range(yr(t));
return arc(d);
};
};
}
so that I could interpolate the scales. The final result allows the inner parent level nodes to shrink without actually disappearing. The maintain a minimum radius based on their d.y values.
I'm struggling to get my first Sankey made the data is pretty simple:
Discharge OBS ADM FULL ADM Total
Station 1 1725 610 708 3043
Station 2 1095 424 464 1983
Station 3 1652 24 27 1703
So, I was thinking of creating the nodes and links in the following fashion - which was unsuccessful:
{
"nodes":[
{"name":"All Patients"},
{"name":"Station 1"},
{"name":"Station 2"},
{"name":"Station 3"},
{"name":"Discharge"},
{"name":"Obs Admission"},
{"name":"Full Admission"}
],
"links":[
{"source":"All Patients","target":"Station 1","value":3.043},
{"source":"All Patients","target":"Station 2","value":1.983},
{"source":"All Patients","target":"Station 3","value":1.703},
{"source":"Station 1","target":"Discharge","value":1.725},
{"source":"Station 2","target":"Discharge","value":1.095},
{"source":"Station 3","target":"Discharge","value":1.652},
{"source":"Station 1","target":"Obs Admission","value":.610},
{"source":"Station 2","target":"Obs Admission","value":.424},
{"source":"Station 3","target":"Obs Admission","value":.024},
{"source":"Station 1","target":"Full Admission","value":.708},
{"source":"Station 2","target":"Full Admission","value":.464},
{"source":"Station 3","target":"Full Admission","value":.027},
]}
Using this index.html:
<!DOCTYPE html>
<meta charset="utf-8">
<title>SANKEY Experiment</title>
<style>
.node rect {
cursor: move;
fill-opacity: .9;
shape-rendering: crispEdges;
}
.node text {
pointer-events: none;
text-shadow: 0 1px 0 #fff;
}
.link {
fill: none;
stroke: #000;
stroke-opacity: .2;
}
.link:hover {
stroke-opacity: .5;
}
</style>
<body>
<p id="chart">
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="sankey.js"></script>
<script>
var units = "Widgets";
var margin = {top: 10, right: 10, bottom: 10, left: 10},
width = 700 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom;
var formatNumber = d3.format(",.0f"), // zero decimal places
format = function(d) { return formatNumber(d) + " " + units; },
color = d3.scale.category20();
// append the svg canvas to the page
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
// Set the sankey diagram properties
var sankey = d3.sankey()
.nodeWidth(36)
.nodePadding(40)
.size([width, height]);
var path = sankey.link();
// load the data
d3.json("sankey-formatted-names.json", function(error, graph) {
var nodeMap = {};
graph.nodes.forEach(function(x) { nodeMap[x.name] = x; });
graph.links = graph.links.map(function(x) {
return {
source: nodeMap[x.source],
target: nodeMap[x.target],
value: x.value
};
});
sankey
.nodes(graph.nodes)
.links(graph.links)
.layout(32);
// add in the links
var link = svg.append("g").selectAll(".link")
.data(graph.links)
.enter().append("path")
.attr("class", "link")
.attr("d", path)
.style("stroke-width", function(d) { return Math.max(1, d.dy); })
.sort(function(a, b) { return b.dy - a.dy; });
// add the link titles
link.append("title")
.text(function(d) {
return d.source.name + " → " +
d.target.name + "\n" + format(d.value); });
// add in the nodes
var node = svg.append("g").selectAll(".node")
.data(graph.nodes)
.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")"; })
.call(d3.behavior.drag()
.origin(function(d) { return d; })
.on("dragstart", function() {
this.parentNode.appendChild(this); })
.on("drag", dragmove));
// add the rectangles for the nodes
node.append("rect")
.attr("height", function(d) { return d.dy; })
.attr("width", sankey.nodeWidth())
.style("fill", function(d) {
return d.color = color(d.name.replace(/ .*/, "")); })
.style("stroke", function(d) {
return d3.rgb(d.color).darker(2); })
.append("title")
.text(function(d) {
return d.name + "\n" + format(d.value); });
// add in the title for the nodes
node.append("text")
.attr("x", -6)
.attr("y", function(d) { return d.dy / 2; })
.attr("dy", ".35em")
.attr("text-anchor", "end")
.attr("transform", null)
.text(function(d) { return d.name; })
.filter(function(d) { return d.x < width / 2; })
.attr("x", 6 + sankey.nodeWidth())
.attr("text-anchor", "start");
// the function for moving the nodes
function dragmove(d) {
d3.select(this).attr("transform",
"translate(" + d.x + "," + (
d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))
) + ")");
sankey.relayout();
link.attr("d", path);
}
});
</script>
</body>
</html>
And this sankey.js:
d3.sankey = function() {
var sankey = {},
nodeWidth = 24,
nodePadding = 8,
size = [1, 1],
nodes = [],
links = [];
sankey.nodeWidth = function(_) {
if (!arguments.length) return nodeWidth;
nodeWidth = +_;
return sankey;
};
sankey.nodePadding = function(_) {
if (!arguments.length) return nodePadding;
nodePadding = +_;
return sankey;
};
sankey.nodes = function(_) {
if (!arguments.length) return nodes;
nodes = _;
return sankey;
};
sankey.links = function(_) {
if (!arguments.length) return links;
links = _;
return sankey;
};
sankey.size = function(_) {
if (!arguments.length) return size;
size = _;
return sankey;
};
sankey.layout = function(iterations) {
computeNodeLinks();
computeNodeValues();
computeNodeBreadths();
computeNodeDepths(iterations);
computeLinkDepths();
return sankey;
};
sankey.relayout = function() {
computeLinkDepths();
return sankey;
};
sankey.link = function() {
var curvature = .5;
function link(d) {
var x0 = d.source.x + d.source.dx,
x1 = d.target.x,
xi = d3.interpolateNumber(x0, x1),
x2 = xi(curvature),
x3 = xi(1 - curvature),
y0 = d.source.y + d.sy + d.dy / 2,
y1 = d.target.y + d.ty + d.dy / 2;
return "M" + x0 + "," + y0
+ "C" + x2 + "," + y0
+ " " + x3 + "," + y1
+ " " + x1 + "," + y1;
}
link.curvature = function(_) {
if (!arguments.length) return curvature;
curvature = +_;
return link;
};
return link;
};
// Populate the sourceLinks and targetLinks for each node.
// Also, if the source and target are not objects, assume they are indices.
function computeNodeLinks() {
nodes.forEach(function(node) {
node.sourceLinks = [];
node.targetLinks = [];
});
links.forEach(function(link) {
var source = link.source,
target = link.target;
if (typeof source === "number") source = link.source = nodes[link.source];
if (typeof target === "number") target = link.target = nodes[link.target];
source.sourceLinks.push(link);
target.targetLinks.push(link);
});
}
// Compute the value (size) of each node by summing the associated links.
function computeNodeValues() {
nodes.forEach(function(node) {
node.value = Math.max(
d3.sum(node.sourceLinks, value),
d3.sum(node.targetLinks, value)
);
});
}
// Iteratively assign the breadth (x-position) for each node.
// Nodes are assigned the maximum breadth of incoming neighbors plus one;
// nodes with no incoming links are assigned breadth zero, while
// nodes with no outgoing links are assigned the maximum breadth.
function computeNodeBreadths() {
var remainingNodes = nodes,
nextNodes,
x = 0;
while (remainingNodes.length) {
nextNodes = [];
remainingNodes.forEach(function(node) {
node.x = x;
node.dx = nodeWidth;
node.sourceLinks.forEach(function(link) {
nextNodes.push(link.target);
});
});
remainingNodes = nextNodes;
++x;
}
//
moveSinksRight(x);
scaleNodeBreadths((width - nodeWidth) / (x - 1));
}
function moveSourcesRight() {
nodes.forEach(function(node) {
if (!node.targetLinks.length) {
node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
}
});
}
function moveSinksRight(x) {
nodes.forEach(function(node) {
if (!node.sourceLinks.length) {
node.x = x - 1;
}
});
}
function scaleNodeBreadths(kx) {
nodes.forEach(function(node) {
node.x *= kx;
});
}
function computeNodeDepths(iterations) {
var nodesByBreadth = d3.nest()
.key(function(d) { return d.x; })
.sortKeys(d3.ascending)
.entries(nodes)
.map(function(d) { return d.values; });
//
initializeNodeDepth();
resolveCollisions();
for (var alpha = 1; iterations > 0; --iterations) {
relaxRightToLeft(alpha *= .99);
resolveCollisions();
relaxLeftToRight(alpha);
resolveCollisions();
}
function initializeNodeDepth() {
var ky = d3.min(nodesByBreadth, function(nodes) {
return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
});
nodesByBreadth.forEach(function(nodes) {
nodes.forEach(function(node, i) {
node.y = i;
node.dy = node.value * ky;
});
});
links.forEach(function(link) {
link.dy = link.value * ky;
});
}
function relaxLeftToRight(alpha) {
nodesByBreadth.forEach(function(nodes, breadth) {
nodes.forEach(function(node) {
if (node.targetLinks.length) {
var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedSource(link) {
return center(link.source) * link.value;
}
}
function relaxRightToLeft(alpha) {
nodesByBreadth.slice().reverse().forEach(function(nodes) {
nodes.forEach(function(node) {
if (node.sourceLinks.length) {
var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedTarget(link) {
return center(link.target) * link.value;
}
}
function resolveCollisions() {
nodesByBreadth.forEach(function(nodes) {
var node,
dy,
y0 = 0,
n = nodes.length,
i;
// Push any overlapping nodes down.
nodes.sort(ascendingDepth);
for (i = 0; i < n; ++i) {
node = nodes[i];
dy = y0 - node.y;
if (dy > 0) node.y += dy;
y0 = node.y + node.dy + nodePadding;
}
// If the bottommost node goes outside the bounds, push it back up.
dy = y0 - nodePadding - size[1];
if (dy > 0) {
y0 = node.y -= dy;
// Push any overlapping nodes back up.
for (i = n - 2; i >= 0; --i) {
node = nodes[i];
dy = node.y + node.dy + nodePadding - y0;
if (dy > 0) node.y -= dy;
y0 = node.y;
}
}
});
}
function ascendingDepth(a, b) {
return a.y - b.y;
}
}
function computeLinkDepths() {
nodes.forEach(function(node) {
node.sourceLinks.sort(ascendingTargetDepth);
node.targetLinks.sort(ascendingSourceDepth);
});
nodes.forEach(function(node) {
var sy = 0, ty = 0;
node.sourceLinks.forEach(function(link) {
link.sy = sy;
sy += link.dy;
});
node.targetLinks.forEach(function(link) {
link.ty = ty;
ty += link.dy;
});
});
function ascendingSourceDepth(a, b) {
return a.source.y - b.source.y;
}
function ascendingTargetDepth(a, b) {
return a.target.y - b.target.y;
}
}
function center(node) {
return node.y + node.dy / 2;
}
function value(link) {
return link.value;
}
return sankey;
};
It didn't work... not sure why. Any advice is greatly appreciated.
Alfa
Unfortunately, looks like couple very minor mistakes.
1) You have an extra comma at the end of your links {"source":"Station 3","target":"Full Admission","value":.027}**,** so use updated sankey-formatted-names.json file without extra comma below. I like to use JSON validator https://jsonformatter.curiousconcept.com/ to confirm if valid JSON file.
2) Also, I looked at an example JSON file at http://bl.ocks.org/d3noob/5028304 and they have the values in double quotes. Since you have source and target as strings, then looks like value must also be a string. If you have source and target as numeric, then value can be numeric.
{
"nodes":[
{"name":"All Patients"},
{"name":"Station 1"},
{"name":"Station 2"},
{"name":"Station 3"},
{"name":"Discharge"},
{"name":"Obs Admission"},
{"name":"Full Admission"}
],
"links":[
{"source":"All Patients","target":"Station 1","value":"3.043"},
{"source":"All Patients","target":"Station 2","value":"1.983"},
{"source":"All Patients","target":"Station 3","value":"1.703"},
{"source":"Station 1","target":"Discharge","value":"1.725"},
{"source":"Station 2","target":"Discharge","value":"1.095"},
{"source":"Station 3","target":"Discharge","value":"1.652"},
{"source":"Station 1","target":"Obs Admission","value":"0.610"},
{"source":"Station 2","target":"Obs Admission","value":"0.424"},
{"source":"Station 3","target":"Obs Admission","value":"0.024"},
{"source":"Station 1","target":"Full Admission","value":"0.708"},
{"source":"Station 2","target":"Full Admission","value":"0.464"},
{"source":"Station 3","target":"Full Admission","value":"0.027"}
]}
I am trying to set the position of nodes (by name) either on the top or the bottom of the Sankey Diagram. For example, if I had a node named "New" and another node named "Dropped", and I wanted to keep the New node at the top of the diagram always, and Dropped nodes at the bottom, how would I accomplish this?
I am looking for something similar to this jsFiddle for setting the x axis position, but for the y position:
//////////////////////// sankey.js /////////////////////////
d3.sankey = function() {
var sankey = {},
nodeWidth = 24,
nodePadding = 8,
size = [1, 1],
nodes = [],
links = [];
sankey.nodeWidth = function(_) {
if (!arguments.length) return nodeWidth;
nodeWidth = +_;
return sankey;
};
sankey.nodePadding = function(_) {
if (!arguments.length) return nodePadding;
nodePadding = +_;
return sankey;
};
sankey.nodes = function(_) {
if (!arguments.length) return nodes;
nodes = _;
return sankey;
};
sankey.links = function(_) {
if (!arguments.length) return links;
links = _;
return sankey;
};
sankey.size = function(_) {
if (!arguments.length) return size;
size = _;
return sankey;
};
sankey.layout = function(iterations) {
computeNodeLinks();
computeNodeValues();
computeNodeBreadths();
computeNodeDepths(iterations);
computeLinkDepths();
return sankey;
};
sankey.relayout = function() {
computeLinkDepths();
return sankey;
};
sankey.link = function() {
var curvature = .5;
function link(d) {
var x0 = d.source.x + d.source.dx,
x1 = d.target.x,
xi = d3.interpolateNumber(x0, x1),
x2 = xi(curvature),
x3 = xi(1 - curvature),
y0 = d.source.y + d.sy + d.dy / 2,
y1 = d.target.y + d.ty + d.dy / 2;
return "M" + x0 + "," + y0
+ "C" + x2 + "," + y0
+ " " + x3 + "," + y1
+ " " + x1 + "," + y1;
}
link.curvature = function(_) {
if (!arguments.length) return curvature;
curvature = +_;
return link;
};
return link;
};
// Populate the sourceLinks and targetLinks for each node.
// Also, if the source and target are not objects, assume they are indices.
function computeNodeLinks() {
nodes.forEach(function(node) {
node.sourceLinks = [];
node.targetLinks = [];
});
links.forEach(function(link) {
var source = link.source,
target = link.target;
if (typeof source === "number") source = link.source = nodes[link.source];
if (typeof target === "number") target = link.target = nodes[link.target];
source.sourceLinks.push(link);
target.targetLinks.push(link);
});
}
// Compute the value (size) of each node by summing the associated links.
function computeNodeValues() {
nodes.forEach(function(node) {
node.value = Math.max(
d3.sum(node.sourceLinks, value),
d3.sum(node.targetLinks, value)
);
});
}
// Iteratively assign the breadth (x-position) for each node.
// Nodes are assigned the maximum breadth of incoming neighbors plus one;
// nodes with no incoming links are assigned breadth zero, while
// nodes with no outgoing links are assigned the maximum breadth.
function computeNodeBreadths() {
var remainingNodes = nodes,
nextNodes,
x = 0;
while (remainingNodes.length) {
nextNodes = [];
remainingNodes.forEach(function(node) {
if (node.xPos)
node.x = node.xPos;
else
node.x = x;
node.dx = nodeWidth;
node.sourceLinks.forEach(function(link) {
nextNodes.push(link.target);
});
});
remainingNodes = nextNodes;
++x;
}
//
moveSinksRight(x);
scaleNodeBreadths((width - nodeWidth) / (x - 1));
}
function moveSourcesRight() {
nodes.forEach(function(node) {
if (!node.targetLinks.length) {
node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
}
});
}
function moveSinksRight(x) {
nodes.forEach(function(node) {
if (!node.sourceLinks.length) {
node.x = x - 1;
}
});
}
function scaleNodeBreadths(kx) {
nodes.forEach(function(node) {
node.x *= kx;
});
}
function computeNodeDepths(iterations) {
var nodesByBreadth = d3.nest()
.key(function(d) { return d.x; })
.sortKeys(d3.ascending)
.entries(nodes)
.map(function(d) { return d.values; });
//
initializeNodeDepth();
resolveCollisions();
for (var alpha = 1; iterations > 0; --iterations) {
relaxRightToLeft(alpha *= .99);
resolveCollisions();
relaxLeftToRight(alpha);
resolveCollisions();
}
function initializeNodeDepth() {
var ky = d3.min(nodesByBreadth, function(nodes) {
return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
});
nodesByBreadth.forEach(function(nodes) {
nodes.forEach(function(node, i) {
node.y = i;
node.dy = node.value * ky;
});
});
links.forEach(function(link) {
link.dy = link.value * ky;
});
}
function relaxLeftToRight(alpha) {
nodesByBreadth.forEach(function(nodes, breadth) {
nodes.forEach(function(node) {
if (node.targetLinks.length) {
var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedSource(link) {
return center(link.source) * link.value;
}
}
function relaxRightToLeft(alpha) {
nodesByBreadth.slice().reverse().forEach(function(nodes) {
nodes.forEach(function(node) {
if (node.sourceLinks.length) {
var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedTarget(link) {
return center(link.target) * link.value;
}
}
function resolveCollisions() {
nodesByBreadth.forEach(function(nodes) {
var node,
dy,
y0 = 0,
n = nodes.length,
i;
// Push any overlapping nodes down.
nodes.sort(ascendingDepth);
for (i = 0; i < n; ++i) {
node = nodes[i];
dy = y0 - node.y;
if (dy > 0) node.y += dy;
y0 = node.y + node.dy + nodePadding;
}
// If the bottommost node goes outside the bounds, push it back up.
dy = y0 - nodePadding - size[1];
if (dy > 0) {
y0 = node.y -= dy;
// Push any overlapping nodes back up.
for (i = n - 2; i >= 0; --i) {
node = nodes[i];
dy = node.y + node.dy + nodePadding - y0;
if (dy > 0) node.y -= dy;
y0 = node.y;
}
}
});
}
function ascendingDepth(a, b) {
return a.y - b.y;
}
}
function computeLinkDepths() {
nodes.forEach(function(node) {
node.sourceLinks.sort(ascendingTargetDepth);
node.targetLinks.sort(ascendingSourceDepth);
});
nodes.forEach(function(node) {
var sy = 0, ty = 0;
node.sourceLinks.forEach(function(link) {
link.sy = sy;
sy += link.dy;
});
node.targetLinks.forEach(function(link) {
link.ty = ty;
ty += link.dy;
});
});
function ascendingSourceDepth(a, b) {
return a.source.y - b.source.y;
}
function ascendingTargetDepth(a, b) {
return a.target.y - b.target.y;
}
}
function center(node) {
return node.y + node.dy / 2;
}
function value(link) {
return link.value;
}
return sankey;
};
///////////////////////////////////////////
function getData() {
return {
"nodes": [{
"node": 0,
"name": "node0"
}, {
"node": 1,
"name": "node1"
}, {
"node": 2,
"name": "node2",
"xPos": 1
}, {
"node": 3,
"name": "node3"
}],
"links": [{
"source": 0,
"target": 1,
"value": 5
}, {
"source": 1,
"target": 3,
"value": 2
}, {
"source": 2,
"target": 3,
"value": 3
}]};
}
var margin = {top: 1, right: 1, bottom: 6, left: 1},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var formatNumber = d3.format(",.0f"),
format = function(d) { return formatNumber(d) + " TWh"; },
color = d3.scale.category20();
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var sankey = d3.sankey()
.nodeWidth(15)
.nodePadding(10)
.size([width, height]);
var path = sankey.link();
var renderSankey = function(energy) {
window.width = 500;
sankey
.nodes(energy.nodes)
.links(energy.links)
.layout(32);
var link = svg.append("g").selectAll(".link")
.data(energy.links)
.enter().append("path")
.attr("class", "link")
.attr("d", path)
.style("stroke-width", function(d) { return Math.max(1, d.dy); })
.sort(function(a, b) { return b.dy - a.dy; });
link.append("title")
.text(function(d) { return d.source.name + " → " + d.target.name + "\n" + format(d.value); });
var node = svg.append("g").selectAll(".node")
.data(energy.nodes)
.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
.call(d3.behavior.drag()
.origin(function(d) { return d; })
.on("dragstart", function() { this.parentNode.appendChild(this); })
.on("drag", dragmove));
node.append("rect")
.attr("height", function(d) { return d.dy; })
.attr("width", sankey.nodeWidth())
.style("fill", function(d) { return d.color = color(d.name.replace(/ .*/, "")); })
.style("stroke", function(d) { return d3.rgb(d.color).darker(2); })
.append("title")
.text(function(d) { return d.name + "\n" + format(d.value); });
node.append("text")
.attr("x", -6)
.attr("y", function(d) { return d.dy / 2; })
.attr("dy", ".35em")
.attr("text-anchor", "end")
.attr("transform", null)
.text(function(d) { return d.name; })
.filter(function(d) { return d.x < width / 2; })
.attr("x", 6 + sankey.nodeWidth())
.attr("text-anchor", "start");
function dragmove(d) {
d3.select(this).attr("transform", "translate(" + d.x + "," + (d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))) + ")");
sankey.relayout();
link.attr("d", path);
}
}
renderSankey(getData());
Try to change the target sort. Instead of function ascendingTargetDepth(a, b) change it to function ascendingTargetDepth(b, a). IE sort by name in descending order.
function ascendingTargetDepth(b, a) {
return a.target.y - b.target.y;
}
Fiddle Example
I can't figure out how to tweak the transform:rotate attribute for the nodes so that the pictures and text in the foreign objects don't rotate/ go upside down. I have tried tweaking with this block of code:
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function (d) {
return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")";
});
In the Chrome Console, I change a node from
<g transform="translate(226.5247584249853,-164.57987064189248)rotate(-36)">
<foreignObject.....></foreignObject></g>
to
transform="translate(226.5247584249853,-164.57987064189248)rotate(0)
and it works. But changing rotate to 0 in the code above would make every children node go to the left side., like this
Full code:
treeData = myJSON;
// Calculate total nodes, max label length
var totalNodes = 0;
var maxLabelLength = 0;
// variables for drag/drop
var selectedNode = null;
var draggingNode = null;
// panning variables
var panSpeed = 200;
var panBoundary = 20; // Within 20px from edges will pan when dragging.
// Misc. variables
var i = 0;
var duration = 750;
var root;
// size of the diagram
var width = $(document).width();
var height = $(document).height();
var diameter = 800;
var tree = d3.layout.tree().size([360, diameter / 2 - 120])
.separation(function (a, b) {
return (a.parent == b.parent ? 1 : 10) / a.depth;
});
// define a d3 diagonal projection for use by the node paths later on.
var diagonal = d3.svg.diagonal.radial()
.projection(function (d) {
return [d.y, d.x / 180 * Math.PI];
});
// Define the root
root = treeData;
root.x0 = height / 2;
root.y0 = 0;
// A recursive helper function for performing some setup by walking through all nodes
function visit(parent, visitFn, childrenFn) {
if (!parent) return;
visitFn(parent);
var children = childrenFn(parent);
if (children) {
var count = children.length;
for (var i = 0; i < count; i++) {
visit(children[i], visitFn, childrenFn);
}
}
}
// Call visit function to establish maxLabelLength
visit(treeData, function (d) {
totalNodes++;
maxLabelLength = Math.max(d.name.length, maxLabelLength);
}, function (d) {
return d.children && d.children.length > 0 ? d.children : null;
});
// sort the tree according to the node names
function sortTree() {
tree.sort(function (a, b) {
return b.name.toLowerCase() < a.name.toLowerCase() ? 1 : -1;
});
}
// Sort the tree initially incase the JSON isn't in a sorted order.
sortTree();
// TODO: Pan function, can be better implemented.
function pan(domNode, direction) {
var speed = panSpeed;
if (panTimer) {
clearTimeout(panTimer);
translateCoords = d3.transform(svgGroup.attr("transform"));
if (direction == 'left' || direction == 'right') {
translateX = direction == 'left' ? translateCoords.translate[0] + speed : translateCoords.translate[0] - speed;
translateY = translateCoords.translate[1];
} else if (direction == 'up' || direction == 'down') {
translateX = translateCoords.translate[0];
translateY = direction == 'up' ? translateCoords.translate[1] + speed : translateCoords.translate[1] - speed;
}
scaleX = translateCoords.scale[0];
scaleY = translateCoords.scale[1];
scale = zoomListener.scale();
svgGroup.transition().attr("transform", "translate(" + translateX + "," + translateY + ")scale(" + scale + ")");
d3.select(domNode).select('g.node').attr("transform", "translate(" + translateX + "," + translateY + ")");
zoomListener.scale(zoomListener.scale());
zoomListener.translate([translateX, translateY]);
panTimer = setTimeout(function () {
pan(domNode, speed, direction);
}, 50);
}
}
// Define the zoom function for the zoomable tree
function zoom() {
svgGroup.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
}
// define the zoomListener which calls the zoom function on the "zoom" event constrained within the scaleExtents
var zoomListener = d3.behavior.zoom().scaleExtent([1, 1]).on("zoom", zoom);
function initiateDrag(d, domNode) {
draggingNode = d;
d3.select(domNode).select('.ghostCircle').attr('pointer-events', 'none');
d3.selectAll('.ghostCircle').attr('class', 'ghostCircle show');
d3.select(domNode).attr('class', 'node activeDrag');
svgGroup.selectAll("g.node").sort(function (a, b) { // select the parent and sort the path's
if (a.id != draggingNode.id) return 1; // a is not the hovered element, send "a" to the back
else return -1; // a is the hovered element, bring "a" to the front
});
// if nodes has children, remove the links and nodes
if (nodes.length > 1) {
// remove link paths
links = tree.links(nodes);
nodePaths = svgGroup.selectAll("path.link")
.data(links, function (d) {
return d.target.id;
}).remove();
// remove child nodes
nodesExit = svgGroup.selectAll("g.node")
.data(nodes, function (d) {
return d.id;
}).filter(function (d, i) {
if (d.id == draggingNode.id) {
return false;
}
return true;
}).remove();
}
// remove parent link
parentLink = tree.links(tree.nodes(draggingNode.parent));
svgGroup.selectAll('path.link').filter(function (d, i) {
if (d.target.id == draggingNode.id) {
return true;
}
return false;
}).remove();
dragStarted = null;
}
// define the baseSvg, attaching a class for styling and the zoomListener
var baseSvg = d3.select("#tree-container").append("svg")
.attr("width", width)
.attr("height", height)
.attr("class", "overlay")
.call(zoomListener);
// Define the drag listeners for drag/drop behaviour of nodes.
dragListener = d3.behavior.drag()
.on("dragstart", function (d) {
if (d == root) {
return;
}
dragStarted = true;
nodes = tree.nodes(d);
d3.event.sourceEvent.stopPropagation();
// it's important that we suppress the mouseover event on the node being dragged. Otherwise it will absorb the mouseover event and the underlying node will not detect it d3.select(this).attr('pointer-events', 'none');
})
.on("drag", function (d) {
if (d == root) {
return;
}
if (dragStarted) {
domNode = this;
initiateDrag(d, domNode);
}
// get coords of mouseEvent relative to svg container to allow for panning
relCoords = d3.mouse($('svg').get(0));
if (relCoords[0] < panBoundary) {
panTimer = true;
pan(this, 'left');
} else if (relCoords[0] > ($('svg').width() - panBoundary)) {
panTimer = true;
pan(this, 'right');
} else if (relCoords[1] < panBoundary) {
panTimer = true;
pan(this, 'up');
} else if (relCoords[1] > ($('svg').height() - panBoundary)) {
panTimer = true;
pan(this, 'down');
} else {
try {
clearTimeout(panTimer);
} catch (e) {
}
}
d.x0 = d3.event.x;
d.y0 = d3.event.y;
var node = d3.select(this);
node.attr("transform", "translate(" + d.x0 + "," + (d.y0) + ")");
updateTempConnector();
})
.on("dragend", function (d) {
if (d == root) {
return;
}
domNode = this;
if (selectedNode) {
// now remove the element from the parent, and insert it into the new elements children
var index = draggingNode.parent.children.indexOf(draggingNode);
if (index > -1) {
draggingNode.parent.children.splice(index, 1);
}
if (typeof selectedNode.children !== 'undefined' || typeof selectedNode._children !== 'undefined') {
if (typeof selectedNode.children !== 'undefined') {
selectedNode.children.push(draggingNode);
} else {
selectedNode._children.push(draggingNode);
}
} else {
selectedNode.children = [];
selectedNode.children.push(draggingNode);
}
// Make sure that the node being added to is expanded so user can see added node is correctly moved
expand(selectedNode);
sortTree();
endDrag();
} else {
endDrag();
}
});
function endDrag() {
selectedNode = null;
d3.selectAll('.ghostCircle').attr('class', 'ghostCircle');
d3.select(domNode).attr('class', 'node');
// now restore the mouseover event or we won't be able to drag a 2nd time
d3.select(domNode).select('.ghostCircle').attr('pointer-events', '');
updateTempConnector();
if (draggingNode !== null) {
update(root);
//centerNode(draggingNode);
draggingNode = null;
}
}
// Helper functions for collapsing and expanding nodes.
function collapse(d) {
if (d.children) {
d._children = d.children;
d._children.forEach(collapse);
d.children = null;
}
}
function expand(d) {
if (d._children) {
d.children = d._children;
d.children.forEach(expand);
d._children = null;
}
}
var overCircle = function (d) {
console.log(d);
selectedNode = d;
updateTempConnector();
};
var outCircle = function (d) {
selectedNode = null;
updateTempConnector();
};
// Function to update the temporary connector indicating dragging affiliation
var updateTempConnector = function () {
var data = [];
if (draggingNode !== null && selectedNode !== null) {
// have to flip the source coordinates since we did this for the existing connectors on the original tree
data = [{
source: {
x: $('svg g').first().offset().left + selectedNode.position.left,
y: selectedNode.position.top
},
target: {
x: draggingNode.x0,
y: draggingNode.y0
}
}];
}
var link = svgGroup.selectAll(".templink").data(data);
link.enter().append("path")
.attr("class", "templink")
.attr("d", d3.svg.diagonal.radial())
.attr('pointer-events', 'none');
link.attr("d", d3.svg.diagonal.radial());
link.exit().remove();
};
// Function to center node when clicked/dropped so node doesn't get lost when collapsing/moving with large amount of children.
function centerNode(source) {
scale = zoomListener.scale();
x = -source.x0;
y = -source.y0;
x = x * scale + width / 2;
y = y * scale + height / 2;
d3.select('g').transition()
.duration(duration)
.attr("transform", "translate(" + x + "," + y + ")scale(" + scale + ")");
zoomListener.scale(scale);
zoomListener.translate([x, y]);
}
// Toggle children function
function toggleChildren(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else if (d._children) {
d.children = d._children;
d._children = null;
}
return d;
}
// Toggle children on click.
function click(d) {
if (d3.event.defaultPrevented) return; // click suppressed
d = toggleChildren(d);
update(d);
//centerNode(d);
//dofocus([{ name : 'o_id' , value : d.o_id }]);
}
function update(source) {
// Compute the new height, function counts total children of root node and sets tree height accordingly.
// This prevents the layout looking squashed when new nodes are made visible or looking sparse when nodes are removed
// This makes the layout more consistent.
var levelWidth = [1];
var childCount = function (level, n) {
if (n.children && n.children.length > 0) {
if (levelWidth.length <= level + 1) levelWidth.push(0);
levelWidth[level + 1] += n.children.length;
n.children.forEach(function (d) {
childCount(level + 1, d);
});
}
};
childCount(0, root);
//var newHeight = d3.max(levelWidth) * 25; // 25 pixels per line
// tree = tree.size([newHeight, width]);
// Compute the new tree layout.
var nodes = tree.nodes(root); //.reverse(),
links = tree.links(nodes);
// Set widths between levels based on maxLabelLength.
// nodes.forEach(function(d) {
// d.y = (d.depth * (maxLabelLength * 10)); //maxLabelLength * 10px
// // alternatively to keep a fixed scale one can set a fixed depth per level
// // Normalize for fixed-depth by commenting out below line
// // d.y = (d.depth * 500); //500px per level.
// });
// Update the nodes…
node = svgGroup.selectAll("g.node")
.data(nodes, function (d) {
return d.id || (d.id = ++i);
});
// Enter any new nodes at the parent's previous position.
var nodeEnter = node.enter().append("g")
.call(dragListener)
.attr("class", "node")
// .attr("transform", function(d) {
// return "translate(" + source.y0 + "," + source.x0 + ")";
// })
.on('click', click)
nodeEnter.append("foreignObject")
.attr("class", "smallcircle")
.attr("width", function (d) {
var f = document.createElement("span");
f.id = "hiddenText";
f.style.display = 'hidden';
f.style.padding = '0px';
f.innerHTML = d.name;
document.body.appendChild(f);
textWidth = f.offsetWidth;
var f1 = document.getElementById('hiddenText');
f1.parentNode.removeChild(f1);
return textWidth + 50;
})
.attr("overflow", "visible")
.attr("height", 50)
.attr("y", - 50 / 2)
.attr("x", - 50)
.append("xhtml:div").attr("class", "mainDiv")
.html(function (d) {
var htmlString = "";
htmlString += "<div class='userImage' style='border-color:red '><img src='https://www.gravatar.com/avatar/6d2db975d856b8799a6198bab4777aed?s=32&d=identicon&r=PG' width='50' height='50'></div>";
htmlString += "<div class='content' style='color:red;'>" + d.name + "</div>";
htmlString += "<div style='clear:both;'></div>";
return htmlString;
})
nodeEnter.append("text")
.text(function (d) {
return d.name;
})
.style("font", "8px serif")
.style("opacity", 0.9)
.style("fill-opacity", 0);
// phantom node to give us mouseover in a radius around it
nodeEnter.append("circle")
.attr('class', 'ghostCircle')
.attr("r", 30)
.attr("opacity", 0.2) // change this to zero to hide the target area
.style("fill", "red")
.attr('pointer-events', 'mouseover')
.on("mouseover", function (node) {
node.position = $(this).position();
node.offset = $(this).offset();
overCircle(node);
})
.on("mouseout", function (node) {
outCircle(node);
});
// Update the text to reflect whether node has children or not.
// node.select('text')
// .attr("x", function(d) {
// return d.children || d._children ? -10 : 10;
// })
// .attr("text-anchor", function(d) {
// return d.children || d._children ? "end" : "start";
// })
// .text(function(d) {
// return d.name;
// });
// Change the circle fill depending on whether it has children and is collapsed
node.select("circle.nodeCircle")
.attr("r", 4.5)
.style("fill", function (d) {
return d._children ? "lightsteelblue" : "#fff";
});
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function (d) {
return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")";
});
nodeUpdate.select("circle")
.attr("r", 4.5)
.style("fill", function (d) {
return d._children ? "lightsteelblue" : "#fff";
});
// Fade the text in
// nodeUpdate.select("text")
// .style("fill-opacity", 1);
nodeUpdate.select("text")
.style("fill-opacity", 1)
// .attr("transform", function(d) { return d.x < 180 ? "translate(0)" : "rotate(180)translate(-" + (d.name.length + 50) + ")"; })
.attr("dy", ".35em")
.attr("text-anchor", function (d) {
return d.x < 180 ? "start" : "end";
})
.attr("transform", function (d) {
return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)";
});
// Transition exiting nodes to the parent's new position.
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function (d) {
return "translate(" + source.x + "," + source.y + ")";
})
.remove();
nodeExit.select("circle")
.attr("r", 0);
nodeExit.select("text")
.style("fill-opacity", 0);
// Update the links…
var link = svgGroup.selectAll("path.link")
.data(links, function (d) {
return d.target.id;
});
// Enter any new links at the parent's previous position.
link.enter().insert("path", "g")
.attr("class", "link")
.attr("d", function (d) {
var o = {
x: source.x0,
y: source.y0
};
return diagonal({
source: o,
target: o
});
});
// Transition links to their new position.
link.transition()
.duration(duration)
.attr("d", diagonal);
// Transition exiting nodes to the parent's new position.
link.exit().transition()
.duration(duration)
.attr("d", function (d) {
var o = {
x: source.x,
y: source.y
};
return diagonal({
source: o,
target: o
});
})
.remove();
// Stash the old positions for transition.
nodes.forEach(function (d) {
d.x0 = d.x;
d.y0 = d.y;
});
}
// Append a group which holds all nodes and which the zoom Listener can act upon.
var svgGroup = baseSvg.append("g").attr("transform", "translate(" + diameter / 2 + "," + diameter / 2 + ")");
// Collapse all children of roots children before rendering.
root.children.forEach(function (child) {
collapse(child);
});
// Layout the tree initially and center on the root node.
update(root);
d3.select(self.frameElement).style("height", width);
The rotation is set in line 1221 of your fiddle:
return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")";
The rotation here is required for the positioning, as you're rotating around the origin of the non-translated coordinate system. So simply removing the rotate(...) won't work. However, you can rotate the elements back after positioning:
return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")rotate(" + (-d.x + 90) + ")";
Complete fiddle here.
I have my data formatted like flare.json that's used in this example :
I am just wondering what function the d3 zoomable chart uses to get the data in this format
In flare.json it's like this
{
name: "stuff",
children: [
....
]
}
and it's converted to this in the example. Which line does this?
{
children: Array[17]
depth: 1
dx: 0.6028744305756647
dy: 0.25
name: "A name would appear here"
parent: Object
value: 39850000.06
x: 0
y: 0.25
}
Chart
var total_revenue = json.total_revenue;
json = json.chart_data;
var width = 840,
height = width,
radius = width / 2,
x = d3.scale.linear().range([0, 2 * Math.PI]),
y = d3.scale.pow().exponent(1.3).domain([0, 1]).range([0, radius]),
padding = 5,
duration = 1000;
var div = d3.select("#chart_render");
div.select("img").remove();
var vis = div.append("svg")
.attr("width", width + padding * 2)
.attr("height", height + padding * 2)
.append("g")
.attr("transform", "translate(" + [radius + padding, radius + padding] + ")");
var partition = d3.layout.partition()
.value(function(d) { return d.size });
var arc = d3.svg.arc()
.startAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x))); })
.endAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x + d.dx))); })
.innerRadius(function(d) { return Math.max(0, d.y ? y(d.y) : d.y); })
.outerRadius(function(d) { return Math.max(0, y(d.y + d.dy)); });
console.log(json);
var nodes = partition.nodes({children: json});
var path = vis.selectAll("path").data(nodes);
path.enter().append("path")
.attr("id", function(d, i) { return "path-" + i; })
.attr("d", arc)
.attr("fill-rule", "evenodd")
.style("fill", colour)
.on("click", click);
var text = vis.selectAll("text").data(nodes);
var textEnter = text.enter().append("text")
.style("fill-opacity", function(d) {
var relative_percent = 0;
var relative_total = 0;
//console.log(d);
if (d.depth != 0) {
for(var i = 0; i < d.parent.children.length; i++) {
relative_total += d.parent.children[i].value;
}
//console.log(relative_total);
relative_percent = d.value/total_revenue*100;
if (relative_percent > 1) {
return '1';
} else {
return '0';
}
}
})
.style("fill", function(d) {
return "#fff";
})
.attr("text-anchor", function(d) {
return x(d.x + d.dx / 2) > Math.PI ? "end" : "start";
})
.attr("dy", ".2em")
.attr("transform", function(d) {
var multiline = (d.name || "").split(" ").length > 1,
angle = x(d.x + d.dx / 2) * 180 / Math.PI - 90,
rotate = angle + (multiline ? -.5 : 0);
return "rotate(" + rotate + ")translate(" + (y(d.y) + padding) + ")rotate(" + (angle > 90 ? -180 : 0) + ")";
})
.on("click", click);
textEnter.append("tspan")
.attr("x", 0)
.text(function(d) { return d.depth ? d.name.split(" ")[0] : ""; });
textEnter.append("tspan")
.attr("x", 0)
.attr("dy", "1em")
.text(function(d) { return d.depth ? d.name.split(" ")[1] || "" : ""; });
function click(d) {
path.transition()
.duration(duration)
.attrTween("d", arcTween(d));
// Somewhat of a hack as we rely on arcTween updating the scales.
text.style("visibility", function(e) {
return isParentOf(d, e) && e.value > 1500000 ? null : d3.select(this).style("visibility");
})
.transition()
.duration(duration)
.attrTween("text-anchor", function(d) {
return function() {
return x(d.x + d.dx / 2) > Math.PI ? "end" : "start";
};
})
.attrTween("transform", function(d) {
var multiline = (d.name || "").split(" ").length > 1;
return function() {
var angle = x(d.x + d.dx / 2) * 180 / Math.PI - 90,
rotate = angle + (multiline ? -.5 : 0);
return "rotate(" + rotate + ")translate(" + (y(d.y) + padding) + ")rotate(" + (angle > 90 ? -180 : 0) + ")";
};
})
.style("fill-opacity", function(e) { return isParentOf(d, e) ? 1 : 1e-6; })
.each("end", function(e) {
d3.select(this).style("visibility", function (d) {
// var relative_total = 0;
// var relative_percent = 0;
// for(var i = 0; i < d.parent.children.length; i++) {
// relative_total += d.parent.children[i].value;
// }
// console.log(relative_total);
// relative_percent = d.value/relative_total*100;
// console.log(relative_percent);
return isParentOf(d, e) && e.value > 1500000 ? null : "hidden";
})
});
}
function isParentOf(p, c) {
if (p === c) return true;
if (p.children) {
return p.children.some(function(d) {
return isParentOf(d, c);
});
}
return false;
}
function colour(d) {
if (d.depth == 0) {
return "rgb(250, 250, 250)";
} else if (d.depth == 1) {
return 'rgb(86, 135, 209)';
} else if (d.depth == 2) {
return 'rgb(222, 120, 59)';
} else if (d.depth == 3) {
return 'rgb(106, 185, 117)';
}
// if (d.children) {
// // There is a maximum of two children!
// var colours = d.children.map(colour),
// a = d3.hsl(colours[0]),
// b = d3.hsl(colours[1]);
// // L*a*b* might be better here...
// return d3.hsl((a.h + b.h) / 2, a.s * 1.2, a.l / 1.2);
// }
// return d.colour || "#fff";
}
// Interpolate the scales!
function arcTween(d) {
var my = maxY(d),
xd = d3.interpolate(x.domain(), [d.x, d.x + d.dx]),
yd = d3.interpolate(y.domain(), [d.y, my]),
yr = d3.interpolate(y.range(), [d.y ? 20 : 0, radius]);
return function(d) {
return function(t) { x.domain(xd(t)); y.domain(yd(t)).range(yr(t)); return arc(d); };
};
}
function maxY(d) {
return d.children ? Math.max.apply(Math, d.children.map(maxY)) : d.y + d.dy;
}
// http://www.w3.org/WAI/ER/WD-AERT/#color-contrast
function brightness(rgb) {
return rgb.r * .299 + rgb.g * .587 + rgb.b * .114;
}
This line:
var nodes = partition.nodes({children: json});
Explanation of code that sets up sunburst diagram
In D3 parlance, sunburst diagram is based on D3 "partition layout". Actually, D3 "partition layout" is in a way more general term, since it can be used for displaying not only sunburst diagram, but also others based on the idea of "partitioning" parents (hence the name "partition"). This is also a useful example for noticing difference between "layout" and "diagram" (in D3 mindset), but this is another story.
Following 2 lines are first steps in initializing partition layout:
var partition = d3.layout.partition()
.value(function(d) { return d.size });
This line does all calculations:
var nodes = partition.nodes({children: json});
Then variable nodes can be used for defining actual visual appearance of svg elements (arcs and labels):
var path = vis.selectAll("path").data(nodes);
and
var text = vis.selectAll("text").data(nodes);
These two lines represent something which is called "data binding" often. They enable programmers to use data to drive visual elements, like in the following line:
.text(function(d) { return d.depth ? d.name.split(" ")[0] : ""; });
Here, d.name originates from data, and d.depth is added by partition layout. They are both actually part of nodes.
I tried to explain in simple terms, but probably there are some confusing points to you - don't worry, it will be crystal clear to you soon, if you read the right docs and tutorials. ;)