Skip to content

Instantly share code, notes, and snippets.

@the-winter

the-winter/.block

Last active March 28, 2018 01:38
Show Gist options
  • Save the-winter/da1649b3a56ffd035cfdba86cdb0f7ad to your computer and use it in GitHub Desktop.
Save the-winter/da1649b3a56ffd035cfdba86cdb0f7ad to your computer and use it in GitHub Desktop.
Download ZIP
d3-force: minimal working example
Raw
.block
license: mit
Raw
README.md
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.links line {
stroke: #999;
stroke-opacity: 0.6;
}
.nodes circle {
stroke: #fff;
stroke-width: 1.5px;
}
</style>
ID: <input type="number" id="data_id"><br>
Join: <input type="number" id="data_join"><br>
<button type="button" onclick="updateArray()"></button>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
function updateArray() {
var data_id = document.getElementById('data_id').value
var data_join = document.getElementById("data_join").value
dataArray.push({source: data_id, target: data_join});
linksArray.push({name: data_id});
console.log(dataArray);
console.log(linksArray);
}
var dataArray = [{sortBy: "Location", name: 1},
{sortBy: "Location", name: 2},
{sortBy: "Location", name: 3},
{sortBy: "Location", name: 4},
{sortBy: "Location", name: 5},
{sortBy: "Location", name: 6}
];
var linksArray = [{source: 1, target: 2},
{source: 1, target: 3},
{source: 1, target: 4}
];
//create somewhere to put the force directed graph
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var nodes_data = [
{"name": "Travis", "sex" : "M"},
{"name": "Rake", "sex": "M"},
{"name": "Diana", "sex": "F"},
{"name": "Rachel", "sex": "F"},
{"name": "Shawn", "sex": "M"},
{"name": "Emerald", "sex": "F"}
]
//set up the simulation
//nodes only for now
var simulation = d3.forceSimulation()
//add nodes
.nodes(dataArray);
//add forces
//we're going to add a charge to each node
//also going to add a centering force
simulation
.force("charge_force", d3.forceManyBody())
.force("center_force", d3.forceCenter(width / 2, height / 2));
//draw circles for the nodes
var node = svg.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(dataArray)
.enter()
.append("circle")
.attr("r", 5)
.attr("fill", "red");
//add tick instructions:
simulation.on("tick", tickActions );
//Time for the links
//Create links data
var links_data = [
{"source": "Travis", "target": "Rake"},
{"source": "Diana", "target": "Rake"},
{"source": "Diana", "target": "Rachel"},
{"source": "Rachel", "target": "Rake"},
{"source": "Rachel", "target": "Shawn"},
{"source": "Emerald", "target": "Rachel"}
]
//Create the link force
//We need the id accessor to use named sources and targets
var link_force = d3.forceLink(linksArray)
.id(function(d) { return d.name; })
//Add a links force to the simulation
//Specify links in d3.forceLink argument
simulation.force("links",link_force)
//draw lines for the links
var link = svg.append("g")
.attr("class", "links")
.selectAll("line")
.data(linksArray)
.enter().append("line")
.attr("stroke-width", 2);
function tickActions() {
//update circle positions each tick of the simulation
node
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
//update link positions
//simply tells one end of the line to follow one node around
//and the other end of the line to follow the other node around
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; });
}
</script>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment