To the esteemed readers. I'm reasonably new in javascript and I have come across this problem. I'm trying to implement a modified version of this force directed graph:
http://mbostock.github.com/d3/ex/force.html
The json data is generated on the fly from a php script. The idea is to color all lines connecting to one specific node ( defined in a php script) in one color and all the others in shades of gray. I'm attempting to do it by matching the source variable in the json file to the variable from the php script and changing color when that is true like this:
var link = svg.selectAll("line.link")
.data(json.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value);})
.style("stroke-opacity", function(d) { return d.value/10;})
.style("stroke", function(d) {
x = (tested == d.source) ? return '#1f77b4' : '#707070';// <-- Attempt to change the color of the link when this is true.
})
however this does not work. The script works fine but without the color change if I just do this
var link = svg.selectAll("line.link")
.data(json.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value);})
.style("stroke-opacity", function(d) { return d.value/10;})
.style("stroke", function(d) {
return '#707070';
})
I've been staring at this for days trying to figure out to get this done and I'm stuck. Any help would be greatly appreciated!!
Here is my complete script
<script type="text/javascript">
var width = 1200,
height = 1200;
var color = d3.scale.category20();
var tested=<?php echo $tested_source;?>; //<-- the variable from php
var svg = d3.select("#chart").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("data.json", function(json) {
var force = d3.layout.force()
.charge(-130)
.linkDistance(function(d) { return 500-(50*d.value);})
.size([width, height]);
force
.nodes(json.nodes)
.links(json.links)
.start();
var link = svg.selectAll("line.link")
.data(json.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value);})
.style("stroke-opacity", function(d) { return d.value/10;})
.style("stroke", function(d) {
x = (tested == d.source) ? return '#1f77b4' : '#707070'; //<-- Attempt to change the color of the link when this is true. But is is not working... :(
})
var node = svg.selectAll("circle.node")
.data(json.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 12)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
</script>
d.source is an object, you can't use == to determine if tested is a similar object. Have a look at this answer for more details on object equality.
If you want to test for a specific value of the d.source object described below, which I assume you want, you need to specify it.
Here is the source object architecture : (I'm using the example you pointed so the data comes from the miserables.json)
source: Object
group: 4
index: 75
name: "Brujon"
px: 865.6440689638284
py: 751.3426708796574
weight: 7
x: 865.9584580575608
y: 751.2658636251376
Now, here is the broken part in your code :
x = (tested == d.source) ? return '#1f77b4' : '#707070';// <-- Attempt to change the color of the link when this is true.
It doesn't work because the return is misplaced.
You're mixing ternary and return statements but you don't put them in the right order :
return test ? value_if_true : value_if_false;
if you want to assign the value to x anyway, you can do
x = test ? value_if_true : value_if_false;
return x;
You should do something like this :
return (tested == d.source) ? '#1f77b4' : '#707070';// <-- Attempt to change the color of the link when this is true.
That's for the general syntax, but this won't work as is You need to pick one of the value for your test for example :
return (tested === d.source.name) ? '#1f77b4' : '#707070';
Also, if the variable from PHP is a string you should do
var tested="<?php echo $tested_source;?>"; //<-- the variable from php
and in most cases you should use json_encode to map PHP variables into javascript ones.
As a final note, I would recommend using console functions coupled with Firebug's console panel if you're using Firefox, or the Chrome Developer Tool's console panel if you're using a Chromium based browser. It would allow you to debug your code more easily.
Working code
var width = 960,
height = 500;
var color = d3.scale.category20();
var force = d3.layout.force().charge(-120).linkDistance(30).size([width, height]);
var svg = d3.select("#chart").append("svg").attr("width", width).attr("height", height);
var tested = 20;
d3.json("miserables.json", function (json) {
force.nodes(json.nodes).links(json.links).start();
var link = svg.selectAll("line.link")
.data(json.links)
.enter()
.append("line")
.attr("class", "link")
.style("stroke-width", function (d) {
return Math.sqrt(d.value);
}).style("stroke-opacity", function (d) {
return d.value / 10;
}).style("stroke", function (d) {
return (tested == d.source.index) ? '#ee3322' : '#707070'; //'#1f77b4'
});
var node = svg.selectAll("circle.node")
.data(json.nodes)
.enter()
.append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function (d) {
return color(d.group);
}).call(force.drag);
node.append("title").text(function (d) {
return d.name;
});
force.on("tick", function () {
link.attr("x1", function (d) {
return d.source.x;
}).attr("y1", function (d) {
return d.source.y;
}).attr("x2", function (d) {
return d.target.x;
}).attr("y2", function (d) {
return d.target.y;
});
node.attr("cx", function (d) {
return d.x;
}).attr("cy", function (d) {
return d.y;
});
});
});
Related
I can't multiple D3 force directed graphs to appear on one page, as they all pile into the same svg for whatever reason. I am out of ideas, and I have tried the top ideas online, which generally center around making sure you have a unique div to place each in, which I do.
I have divs with ids occurrences5, occurrences5...etc. So the loop should correctly find each div. The names of the JSON files are the same as the ids for each div.
var color = d3.scale.category20();
var occurences = ["occurrences3", "occurrences5", "occurrences10","occurrences20"];
for (var i = 0; i < occurences.length; i++) {
var occurence = occurences[i];
var svg = d3.select("#" + occurence).append("svg")
.attr("width", width)
.attr("height", height)
.attr("id", "#" + occurence + "svg");
d3.json(occurence + ".json", function(error, graph) {
if (error) throw error;
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
}})
You need to set svg within the callback function(error, graph) you pass to d3.json and not outside it
Reason: the callback function you pass to d3.json is called asynchronously i.e. it won't run nicely once per iteration as you're looping through the occurrences array. It appears all 4 callbacks are returning after that loop has finished and thus svg is set to the last value it had in that loop, thus everything's getting added to that svg element.
If I separate the creation of each chart into their own function() blocks, it works. I got my answer from: D3 Dimple - How to show multiple dimple charts on same page?
However, you can separate into a function like so:
var occurences = ["occurrences3", "occurrences5", "occurrences10","occurrences20"];
occurences.forEach(function(entry) {
draw(entry);
});
function draw(occurence) {...
I've added a new peice of javascript to an old script I had to add a highlighting functionality to a force network layout. I get the information for the diagram from generated json in a rails app. The original code I've been using is here:
var width = 960,
height = 960;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-100)
.linkDistance(530)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var endpoint = window.location.href+".json"
d3.json(endpoint, function(graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("marker-end", "url(#suit)");
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 10)
.style("fill", function(d) { return color(d.group); })
.call(force.drag)
.on('dblclick', connectedNodes);
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
svg.append("defs").selectAll("marker")
.data(["suit", "licensing", "resolved"])
.enter().append("marker")
.attr("id", function(d) { return d; })
.attr("viewBox", "0 -5 10 10")
.attr("refX", 25)
.attr("refY", 0)
.attr("markerWidth", 6)
.attr("markerHeight", 6)
.attr("orient", "auto")
.append("path")
.attr("d", "M0,-5L10,0L0,5 L10,0 L0, -5")
.style("stroke", "#4679BD")
.style("opacity", "0.6");
//APPENDED CODE ADDED HERE
//Toggle stores whether the highlighting is on
var toggle = 0;
//Create an array logging what is connected to what
var linkedByIndex = {};
for (i = 0; i < graph.nodes.length; i++) {
linkedByIndex[i + "," + i] = 1;
};
graph.links.forEach(function (d) {
linkedByIndex[d.source.index + "," + d.target.index] = 1;
});
//This function looks up whether a pair are neighbours
function neighboring(a, b) {
return linkedByIndex[a.index + "," + b.index];
}
function connectedNodes() {
if (toggle == 0) {
//Reduce the opacity of all but the neighbouring nodes
d = d3.select(this).node().__data__;
node.style("opacity", function (o) {
return neighboring(d, o) | neighboring(o, d) ? 1 : 0.1;
});
link.style("opacity", function (o) {
return d.index==o.source.index | d.index==o.target.index ? 1 : 0.1;
});
//Reduce the op
toggle = 1;
} else {
//Put them back to opacity=1
node.style("opacity", 1);
link.style("opacity", 1);
toggle = 0;
}
}
I then tried to append further code as suggested here and simply added the following to the bottom of the script above where it is marked in capital letters
Could have been so simple.... The script worked but the added functionlity (to add highlights between nodes) didn't. An error message says:
Uncaught ReferenceError: graph is not defined
My susipicion is that it relates to the line
d3.json(endpoint, function(graph) {
and the fact that the subsequent }); is in the wrong place to encompass the new code but I've played with it and I'm not sure how to correct it
UPDATE
I've solved this. The problem was simply that I was declaring graph inside a function and the other functions couldn't access it. The solution is to put the other functions inside the function that delares it which in effect means moving the last
});
from the line
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
to the very last line. Works fine now
The answer is now given in the UPDATE section of the question
I'm not an expert in d3 (as many of you know) however I am attempting to modify a working force network so that the nodes are fixed. So far I have been able to get the nodes to work but haven't been able to get the lines between them to work.
I've created a fiddle at http://jsfiddle.net/PatriciaW/Dnnve/
Any help will be very welcome.
var width = 960,
height = 700,
n = 100;
var categoryColour = {
"community group": "red",
"volunteer": "blue",
"organization": "green",
"air": "transparent"
};
var json2 = {"nodes":[{"node":{"name":"TCAN","x2":1,"y2":2,"description":"A network of organizations in Toronto devoted to climate change mitigation and adaptation.","category":"organization","size":3,"URL":"http:\/\/localhost:8888\/mydrupal\/groups\/tcan"}},{"node":{"name":"Rita ","x2":5,"y2":3,"description":"Rita is devoted to mitigating climate change and participates in many organizations.","category":"volunteer","size":2,"URL":"http:\/\/localhost:8888\/mydrupal\/groups\/rita"}},{"node":{"name":"Green 13","x2":5,"y2":4,"description":"Green 13","category":"community group","size":2,"URL":"http:\/\/localhost:8888\/mydrupal\/groups\/green-13"}},{"node":{"name":"ZCO","x2":3,"y2":1,"description":"Zero Carbon Ontario","category":"organization","size":2,"URL":"http:\/\/localhost:8888\/mydrupal\/groups\/zco"}},{"node":{"name":"Resilient Toronto","x2":3,"y2":5,"description":"","category":"organization","size":3,"URL":"http:\/\/localhost:8888\/mydrupal\/groups\/resilient-toronto"}},{"node":{"name":"City of Toronto","x2":3,"y2":3,"description":"","category":"organization","size":5,"URL":"http:\/\/localhost:8888\/mydrupal\/groups\/city-toronto"}}]};
var nodes=json2.nodes.map(function(json2) {
return json2.node;
});
var i = 0;
while (i < nodes.length) {
nodes[i].fixed=true;
nodes[i].x = (nodes[i].x2)*100;
nodes[i].y = (nodes[i].y2)*100;
i = i+ 1;
}
var json = {"connections":[{"connection":{"source":"Rita","target":"Resilient Toronto"}},{"connection":{"source":"TCAN","target":"Resilient Toronto"}},{"connection":{"source":"Resilient Toronto","target":"City of Toronto"}},{"connection":{"source":"Rita","target":"ZCO"}},{"connection":{"source":"Rita","target":"Green 13"}},{"connection":{"source":"Green 13","target":"TCAN"}},{"connection":{"source":"ZCO","target":"TCAN"}}]};
var links=json.connections.map(function(json) {
return json.connection;
});
var force = d3.layout.force()
.nodes(nodes)
.links(links)
.size([width, height])
.linkDistance(60)
.charge(-300)
.on("tick", tick)
.start();
svg = d3.select("#network")
.append("svg")
.attr("width", width)
.attr("height", height);
var link = svg.selectAll(".link")
.data(force.links())
.enter().append("line")
.attr("class", "link");
var node = svg.selectAll(".node")
.data(force.nodes())
.enter().append("g")
.attr("class", "node")
.call(force.drag);
node.append("circle") // this is OK if use nodes or links below but defaults to links
.attr("r", 8)
.style("fill", function(nodes) {
return categoryColour [nodes.category];
})
node.append("text") // OK
.attr("x", 12)
.attr("dy", ".35em")
.text(function(d) {
return d.name; });
function tick() {
link
.attr("x1", function(d) {
// console.log("d"); console.log(d); has source and target but not .x and y values?
return d.source.x; })
.attr("y1", function(d) {
return d.source.y; })
.attr("x2", function(d) {
return d.target.x; })
.attr("y2", function(d) {
return d.target.y; });
node
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
};
// Use a timeout to allow the rest of the page to load first.
setTimeout(function() {
force.tick();
console.log("timeout nodes "); console.log(nodes); //
svg.selectAll("line")
.data(links)
.enter().append("line")
.attr("x1", function(d) {
return d.source.x; })
.attr("y1", function(d) {
return d.source.y; })
.attr("x2", function(d) {
return d.target.x; })
.attr("y2", function(d) {
return d.target.y; });
svg.selectAll("circle")
.data(nodes)
.enter().append("circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", 4.5);
}, 10);
I'm not an expert either but I think you are having issues because the source and target values in your connections should be referencing the respective positional array index for the node (not the name of the node).
A simple example, in your fiddle just change the first connection from...
{"connection":{"source":"Rita","target":"Resilient Toronto"}}
to...
{"connection":{"source":1,"target":4}}
1 and 4 being the index of the elements in the nodes array. Hope this is what you are looking for.
I updated the jsfiddle with the working code. Needs improvement but demonstrates the principle.
I'm working on the example located on jsfiddle, here.
It appears that I have everything structured properly, as the children are properly associated with their parents and the proper text is displayed.
The problems I've run into are as follows...
The main node (in the center) is not collapsible. The overall behavior of the graph is somewhat glitchy when compared to the example located here.
Colors do not change when nodes are collapsed, children of the parent node are displayed when the parent is collapsed. After several clicks on various nodes, children and parents seem to get switched.
My question is what section of code could be causing this and why?
Here's the code that I'm using to generate the chart. Data is missing, but is provided by the jsfiddle. Any help is appreciated, thanks in advance.
var width = 960,
height = 500,
root;
var force = d3.layout.force()
.charge(-220)
.size([width, height])
.on("tick", tick);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var link = svg.selectAll(".link");
function update() {
var nodes = flatten(root);
var links = d3.layout.tree().links(nodes);
console.log(nodes);
// Restart the force layout.
force.nodes(nodes)
.links(links)
.linkDistance(55)
.start();
var link = svg.selectAll(".link")
.data(links, function(d) { return d.target.id; });
link.enter().append("line")
.attr("class", "link");
link.exit().remove();
var node = svg.selectAll("g.node")
.data(nodes)
var groups = node.enter().append("g")
.attr("class", "node")
.attr("id", function (d) {
return d.id
})
.on('click', click)
.call(force.drag);
groups.append("circle")
.attr("class","node")
.attr("x", -8)
.attr("y",-8)
.attr("r", function(d) { return d.children ? 4.5 : 10 })
.style("fill", color)
.on("click", click)
.call(force.drag);
groups.append("text")
.attr("dx", 12)
.attr("dy", "0.35em")
.style("font-size", "10px")
.style("color", "#000000")
.style("font-family", "Arial")
.text(function (d) {
console.log(d);
return d.name
});
node.exit().remove();
force.on("tick", function () {
link.attr("x1", function (d) {
return d.source.x;
})
.attr("y1", function (d) {
return d.source.y;
})
.attr("x2", function (d) {
return d.target.x;
})
.attr("y2", function (d) {
return d.target.y;
});
node.attr("transform", function (d) {
return "translate(" + d.x + "," + d.y + ")";
});
});
}
function tick() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("transform", function (d) {
return "translate(" + d.x + "," + d.y + ")";
});
}
// Color leaf nodes orange, and packages white or blue.
function color(d) {
return d._children ? "#3182bd" // collapsed package
: d.children ? "#c6dbef" // expanded package
: "#fd8d3c"; // leaf node
}
// Toggle children on click.
function click(d) {
if (!d3.event.defaultPrevented) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update();
}
}
// Returns a list of all nodes under the root.
function flatten(root) {
var nodes = [], i = 0;
function recurse(node) {
if (node.children) node.children.forEach(recurse);
if (!node.id) node.id = ++i;
nodes.push(node);
}
recurse(root);
return nodes;
}
Ok, there are two things going on here.
First, by default, d3 uses the index of each datum as its ID (to determine when the item enters/exits the selection). This is your issue with parent/children moving around, when the element at index X is replaced by a new element, d3 thinks they are the same. You need to provide a function to return the id:
var node = svg.selectAll("g.node")
.data(nodes, function(d) { return d.id; });
Second, you're only setting the fill color of the circle when an item enters the selection. You should extract the bit that is assigning the style out of the enter() block, so it will be executed each time you call update().
node.selectAll('circle').style('fill', color);
I copied and hacked together your fiddle into plunker, because jsFiddle was running really slow for me:
http://plnkr.co/edit/7AJlQub6uCGQ3VSvq4pa?p=preview
experts out there,
i've got a little probem I seem not to be able to figure out by myself.
I have some data that are displayed as a graph. I get a file with the data and extract the required nodes to an array i called 'reqNodes'.
The main-node that is supposed to be 'the center' of all the displayed data is fixed, the others have a force layout applied to them.
What I struggle with at the moment: if the user clicks on any other node, this one becomes the center of the graph. he is fixed, the old one unfixed. Working so far. But I would like the new center node to transition to the center of the screen. At the moment all the nodes always stay where I clicked them, and so the graph moves with every new node i click, if i don't push it back to the center manually.
If you have any great idea to help me out, I'd be very glad!
greetz, Dave
function update() {
group.selectAll(".link").remove();
group.selectAll(".node").remove();
for(var count = 0; count < reqNodes.length; count++){
reqNodes[count].fixed = false;
}
var fixedNode = reqNodes[getNodesFinalIndex(mittelpunkt)];
fixedNode.fixed = true;
fixedNode.px = width/2;
fixedNode.py = height/2;
force
.nodes(reqNodes)
.links(reqLinks)
.start();
link = group.selectAll(".link")
.data(reqLinks);
link.enter().append("line")
.attr("class", "link")
.style("stroke", "#000")
.style("stroke-width", function(d) { return Math.sqrt(d.value)*1.2; });
node = group.selectAll(".node")
.data(reqNodes);
node.enter().append("circle")
.attr("class", "node")
.attr("r", 7)
.style("stroke", "black")
.style("fill", function(d) { return colorArray[d.group]; })
.call(force.drag);
for(var oo = 0; oo < group.selectAll(".node").length; oo++){
if(group.selectAll(".node")[oo].name = mittelpunkt){
console.log("node[0][oo]: ");
console.log(node[0][oo]);
node[0][oo].style.stroke = "red";
node[0][oo].style.strokeWidth = 4;
}
}
node.append("title")
.text(function(d) { return d.name; });
node.on("click", function(d) {
mittelpunkt = d.name;
paintIt();
});
node.append("text").attr("dx", 12).attr("dy", ".35em").attr("fill", "#aa0101").text(function(d) {
return d.name
});
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
Hope i didn't forget something essential. If you miss something, just let me know!
Note:
var group = d3.select("#chart").append("svg").attr("width", width).attr("height", height).attr("id", 'networkBox').append('g');