Simple graph of nodes and links without using force layout
I have made a small code snippet. Hope this helpful.
var data = {
nodes: [{
name: "A",
x: 200,
y: 150
}, {
name: "B",
x: 140,
y: 300
}, {
name: "C",
x: 300,
y: 300
}, {
name: "D",
x: 300,
y: 180
}],
links: [{
source: 0,
target: 1
}, {
source: 1,
target: 2
}, {
source: 2,
target: 3
}, ]
};
var c10 = d3.scale.category10();
var svg = d3.select("body")
.append("svg")
.attr("width", 1200)
.attr("height", 800);
var drag = d3.behavior.drag()
.on("drag", function(d, i) {
d.x += d3.event.dx
d.y += d3.event.dy
d3.select(this).attr("cx", d.x).attr("cy", d.y);
links.each(function(l, li) {
if (l.source == i) {
d3.select(this).attr("x1", d.x).attr("y1", d.y);
} else if (l.target == i) {
d3.select(this).attr("x2", d.x).attr("y2", d.y);
}
});
});
var links = svg.selectAll("link")
.data(data.links)
.enter()
.append("line")
.attr("class", "link")
.attr("x1", function(l) {
var sourceNode = data.nodes.filter(function(d, i) {
return i == l.source
})[0];
d3.select(this).attr("y1", sourceNode.y);
return sourceNode.x
})
.attr("x2", function(l) {
var targetNode = data.nodes.filter(function(d, i) {
return i == l.target
})[0];
d3.select(this).attr("y2", targetNode.y);
return targetNode.x
})
.attr("fill", "none")
.attr("stroke", "white");
var nodes = svg.selectAll("node")
.data(data.nodes)
.enter()
.append("circle")
.attr("class", "node")
.attr("cx", function(d) {
return d.x
})
.attr("cy", function(d) {
return d.y
})
.attr("r", 15)
.attr("fill", function(d, i) {
return c10(i);
})
.call(drag);
svg {
background-color: grey;
}
<script src="https://d3js.org/d3.v3.min.js"></script>
Gilsha has a great answer, but note that newer versions of d3 no longer use the behavior module.
Instead of this:
var drag = d3.behavior.drag()
.on("drag", function(d, i) {
d.x += d3.event.dx
d.y += d3.event.dy
d3.select(this).attr("cx", d.x).attr("cy", d.y);
links.each(function(l, li) {
if (l.source == i) {
d3.select(this).attr("x1", d.x).attr("y1", d.y);
} else if (l.target == i) {
d3.select(this).attr("x2", d.x).attr("y2", d.y);
}
});
});
Simply change d3.behavior.drag() to d3.drag()
var drag = d3.drag()
.on("drag", function(d, i) {
d.x += d3.event.dx
d.y += d3.event.dy
d3.select(this).attr("cx", d.x).attr("cy", d.y);
links.each(function(l, li) {
if (l.source == i) {
d3.select(this).attr("x1", d.x).attr("y1", d.y);
} else if (l.target == i) {
d3.select(this).attr("x2", d.x).attr("y2", d.y);
}
});
});