I have a a D3 v4 force simulation with nodes moving around the screen. Each node is a group consisting of a circle and some text below it. How do I order this so that the circles are on a bottom layer and the text on a top layer always. It's okay for a circle to overlap a circle, but it's never okay for a circle to overlap on top of text. Here is what I've got. Currently, the node's circle that is ahead of the other node will overlap that node's text.
this.centerNode = this.d3Graph.selectAll(null)
.data(this.nodes.slice(10,20))
.enter()
.append("g")
this.centerNode.append("circle")
.attr("class", "backCircle")
.attr("r", 60)
.attr("fill", "red")
this.centerNode
.append("text")
.attr("fill", "black")
.attr("font-size", "20px")
.attr("y", -60)
.text("test text" )
You cannot achieve the desired outcome with your current approach. The reason is simple: each group has a text and a circle. However, the painting order depends on the order of the groups:
<g>
<circle></circle>
<text></text><!-- this text here... -->
</g>
<g>
<circle></circle><!-- ...will be behind this circle here -->
<text></text>
</g>
<!-- etc... -->
So, grouping the texts and the circles inside <g> elements, you will have the groups painted in a given order and, consequently, a circle over a text (the circle of a given group is painted over the texts of all groups before it).
Here is a demo (the Baz circle will be on top of all texts, and the Bar circle will be on top of Foo text):
var width = 300;
var height = 200;
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
var nodes = [{
name: "Foo"
}, {
name: "Bar"
}, {
name: "Baz"
}];
var links = [{
"source": 0,
"target": 1
}, {
"source": 0,
"target": 2
}];
var simulation = d3.forceSimulation()
.force("link", d3.forceLink())
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));
var link = svg.selectAll(null)
.data(links)
.enter()
.append("line")
.style("stroke", "#ccc")
.style("stroke-width", 1);
var color = d3.scaleOrdinal(d3.schemeCategory20);
var node = svg.selectAll(null)
.data(nodes)
.enter()
.append("g")
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
var nodeCircle = node.append("circle")
.attr("r", 20)
.attr("stroke", "gray")
.attr("stroke-width", "2px")
.attr("fill", function(d, i) {
return color(i)
});
var nodeTexts = node.append("text")
.style("fill", "black")
.attr("dx", 20)
.attr("dy", 8)
.text(function(d) {
return d.name;
});
simulation.nodes(nodes);
simulation.force("link")
.links(links);
simulation.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", (d) => "translate(" + d.x + "," + d.y + ")")
});
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
<script src="https://d3js.org/d3.v4.min.js"></script>
Solution
A possible solution is creating two selections, one for the circles and one for the texts. Append the circles before, and the texts later. Remember to use the same nodes array for both:
var node = svg.selectAll(null)
.data(nodes)
.enter()
.append("circle")
//etc...
var nodeTexts = svg.selectAll(null)
.data(nodes)
.enter()
.append("text")
//etc...
That way, the texts will be always on top of the circles.
Check the demo:
var width = 300;
var height = 200;
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
var nodes = [{
name: "Foo"
}, {
name: "Bar"
}, {
name: "Baz"
}];
var links = [{
"source": 0,
"target": 1
}, {
"source": 0,
"target": 2
}];
var simulation = d3.forceSimulation()
.force("link", d3.forceLink())
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));
var link = svg.selectAll(null)
.data(links)
.enter()
.append("line")
.style("stroke", "#ccc")
.style("stroke-width", 1);
var color = d3.scaleOrdinal(d3.schemeCategory20);
var node = svg.selectAll(null)
.data(nodes)
.enter()
.append("circle")
.attr("r", 20)
.attr("stroke", "gray")
.attr("stroke-width", "2px")
.attr("fill", function(d, i) {
return color(i)
})
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
var nodeTexts = svg.selectAll(null)
.data(nodes)
.enter()
.append("text")
.style("fill", "black")
.attr("dx", 20)
.attr("dy", 8)
.text(function(d) {
return d.name;
});
simulation.nodes(nodes);
simulation.force("link")
.links(links);
simulation.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", (d) => "translate(" + d.x + "," + d.y + ")")
nodeTexts.attr("transform", (d) => "translate(" + d.x + "," + d.y + ")")
});
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
<script src="https://d3js.org/d3.v4.min.js"></script>
I'm trying to create a forceSimulation in d3 v4 which does not let the nodes float outside the boundries of the svg in the same way that this example has it for d3 v3 https://bl.ocks.org/mbostock/1129492.
Have tried a few different things in simulation.on("tick", ticked) to no avail. My codePen is below. Any ideas on how to achieve this?
https://codepen.io/mtsvelik/pen/rzxVrE
//Read the data from the mis element
var graph = document.getElementById('json').innerHTML;
graph = JSON.parse(graph);
render(graph);
function render(graph){
// Dimensions of sunburst.
var radius = 6;
var maxValue = d3.max(graph.links, function(d, i, data) {
return d.value;
});
//sub-in max-value from
d3.select("div").html('<form class="force-control" ng-if="formControl">Link threshold 0 <input type="range" id="thersholdSlider" name="points" value="0" min="0" max="'+ maxValue +'">'+ maxValue +'</form>');
document.getElementById("thersholdSlider").onchange = function() {threshold(this.value);};
var svg = d3.select("svg");
var width = svg.attr("width");
var height = svg.attr("height");
console.log(graph);
var graphRec = JSON.parse(JSON.stringify(graph)); //Add this line
//graphRec = graph; //Add this line
console.log(graphRec);
var simulation = d3.forceSimulation()
.force("link", d3.forceLink().id(function(d) { return d.id; }))
.force("charge", d3.forceManyBody().strength(Number(-1000 + (1.25*graph.links.length)))) //default force is -30, making weaker to increase size of chart
.force("center", d3.forceCenter(width / 2, height / 2));
var link = svg.append("g")
.attr("class", "links")
.selectAll("line")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.attr("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", radius)
.attr("fill", function(d) { return d.color; })
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
node.append("title")
.text(function(d) { return d.id; });
simulation
.nodes(graph.nodes)
.on("tick", ticked);
simulation.force("link")
.links(graph.links);
console.log(link.data(graph.links));
function ticked() {
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; });
}
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
function threshold(thresh) {
thresh = Number(thresh);
graph.links.splice(0, graph.links.length);
for (var i = 0; i < graphRec.links.length; i++) {
if (graphRec.links[i].value > thresh) {graph.links.push(graphRec.links[i]);}
}
console.log(graph.links);
/*var threshold_links = graph.links.filter(function(d){ return (d.value > thresh);});
console.log(graph.links);
restart(threshold_links);*/
restart();
}
//Restart the visualisation after any node and link changes
// function restart(threshold_links) {
function restart() {
//DATA JOIN
//link = link.data(threshold_links);
link = link.data(graph.links);
console.log(link);
//EXIT
link.exit().remove();
console.log(link);
// ENTER - https://bl.ocks.org/colbenkharrl/21b3808492b93a21de841bc5ceac4e47
// Create new links as needed.
link = link.enter().append("line")
.attr("class", "link")
.attr("stroke-width", function(d) { return Math.sqrt(d.value); }).merge(link);
console.log(link);
// DATA JOIN
node = node.data(graph.nodes);
/*
// EXIT
node.exit().remove();
// ENTER
node = node.enter().append("circle")
.attr("class", "node")
.attr("r", radius)
.attr("fill", function(d) {return d.color;})
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended)
)
.merge(node);
node.append("title")
.text(function(d) { return d.id; });
*/
simulation
.nodes(graph.nodes)
.on("tick", ticked);
simulation.force("link")
.links(graph.links);
simulation.alphaTarget(0.3).restart();
}
}
In the tick function restrict the nodes to move out from the boundary:
node
.attr("cx", function(d) {
return (d.x = Math.max(radius, Math.min(width - radius, d.x)));
})
.attr("cy", function(d) {
return (d.y = Math.max(radius, Math.min(height - radius, d.y)));
})
//now update the links.
working code here
You can also use d3.forceBoundary that allows you to set a boundary with a strength. In your code
import it
<script src="https://unpkg.com/d3-force-boundary#0.0.1/dist/d3-force-boundary.min.js"></script>
then
var simulation = d3.forceSimulation()
.force("boundary", forceBoundary(0,0,width, height))
.force("link", d3.forceLink().id(function(d) { return d.id; }))
.force("charge", d3.forceManyBody().strength(Number(-1000 + (1.25*graph.links.length)))) //default force is -30, making weaker to increase size of chart
.force("center", d3.forceCenter(width / 2, height / 2));
your pen fixed https://codepen.io/duto_guerra/pen/XWXagqm
I'm new to D3 and I cannot seem to find a way to implement node labels plus zoom/pan at the same time on my D3.js v4 forced-directed graph. My code is as below.
Any help with this would be greatly appreciated
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.links line {
stroke: #999;
stroke-opacity: 0.6;
}
.nodes circle {
stroke: black ;
stroke-width: 0px;
}
.svg-container {
display: inline-block;
position: relative;
width: 100%;
padding-bottom: 100%;
vertical-align: top;
overflow: hidden;
}
.svg-content {
display: inline-block;
position: absolute;
top: 0;
left: 0;
}
</style>
<div id="container" class="svg-container">
</div>
<!--<svg viewBox="0 0 300 300"></svg>-->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var width = 3000;
var height = 3000;
//create somewhere to put the force directed graph
var svg = d3.select("div#container")
.append("svg")
.attr("preserveAspectRatio", "xMinYMin meet")
.attr("viewBox", "0 0 3000 3000")
.classed("svg-content", true);
var color = d3.scaleOrdinal(d3.schemeCategory20);
var radius = 5;
var nodes_data; // global
var links_data; // global
d3.json("features_map_export.json", function(error, data) {
nodes_data = data.nodes
links_data = data.links
var simulation = d3.forceSimulation()
.nodes(nodes_data);
var link_force = d3.forceLink(links_data)
.id(function(d) { return d.name; });
var charge_force = d3.forceManyBody()
.strength(-100);
var center_force = d3.forceCenter(width / 2, height / 2);
simulation
.force("charge_force", charge_force)
.force("center_force", center_force)
.force("links",link_force)
;
//add tick instructions:
simulation.on("tick", tickActions );
//add encompassing group for the zoom
var g = svg.append("g")
.attr("class", "everything");
//draw lines for the links
var link = g.append("g")
.attr("class", "links")
.selectAll("line")
.data(links_data)
.enter().append("line")
.attr("stroke-width", 2)
.style("stroke", linkColour);
//draw circles for the nodes
var node = g.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(nodes_data)
.enter()
.append("circle")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); });
node.append("title")
.text(function(d) { return d.name; });
node.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.category });
//add drag capabilities
var drag_handler = d3.drag()
.on("start", drag_start)
.on("drag", drag_drag)
.on("end", drag_end);
drag_handler(node);
//add zoom capabilities
var zoom_handler = d3.zoom()
.on("zoom", zoom_actions);
zoom_handler(svg);
/** Functions **/
//Function to choose what color circle we have
//Let's return blue for males and red for females
function circleColour(d){
return "pink";
}
//Function to choose the line colour and thickness
//If the link type is "A" return green
//If the link type is "E" return red
function linkColour(d){
return "green";
}
//Drag functions
//d is the node
function drag_start(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
//make sure you can't drag the circle outside the box
function drag_drag(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function drag_end(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
//Zoom functions
function zoom_actions(){
g.attr("transform", d3.event.transform)
}
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; })-->
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });;
//update link positions
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>
I have been doing quite a bit of work in this area recently, have a look at this complete solution in plunker...
http://plnkr.co/edit/ZSmvH05nnAD6cYZb0EM4?p=preview
The key bit here is:
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
Then just include the boiler-plate drag functions:
//Used to drag the graph round the screen
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
As for the zoom, this is just a case of attaching the zoom handler to the top level svg container... see the Plunker for details.
svg.call(zoom_handler)
.call(zoom_handler.transform, d3.zoomIdentity.scale(1,1))
;
The initial zoom can be set by changing the scale values:
.call(zoom_handler.transform, d3.zoomIdentity.scale(0.5,0.5))
will be half the size.
As for attaching your labels, this should hopefully be fairly obvious from the Plunker.
Hope this helps
The goal is to combine d3 force simulation, g elements, and voronoi polygons to make trigger events on nodes easier, such as dragging, mouseovers, tooltips and so on with a graph that can be dynamically modified. This follows the d3 Circle Dragging IV example.
In the following code, when adding the clip path attribute to the g element and clippath elements:
Why does dragging not trigger on the cells?
Why do the nodes become obscured and the
paths lose their styles on edges?
How can this be fixed to drag the nodes and trigger events on them like mouseovers?
var data = [
{
"index" : 0,
"vx" : 0,
"vy" : 0,
"x" : 842,
"y" : 106
},
{
"index" : 1,
"vx" : 0,
"vy" : 0,
"x" : 839,
"y" : 56
},
{
"index" : 2,
"vx" : 0,
"vy" : 0,
"x" : 771,
"y" : 72
}
]
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var simulation = d3.forceSimulation(data)
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2))
.on("tick", ticked);
var nodes = svg.append("g").attr("class", "nodes"),
node = nodes.selectAll("g"),
paths = svg.append("g").attr("class", "paths"),
path = paths.selectAll("path");
var voronoi = d3.voronoi()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.extent([[0, 0], [width, height]]);
var update = function() {
node = nodes.selectAll("g").data(data);
var nodeEnter = node.enter()
.append("g")
.attr("class", "node")
.attr("clip-path", function(d, i) { return "url(#clip-" + i + ")"; });
nodeEnter.append("circle");
nodeEnter.append("text")
.text(function(d, i) { return i; });
node.merge(nodeEnter);
path = paths.selectAll(".path")
.data(data)
.enter().append("clipPath")
.attr("id", function(d, i) { return "clip-" + i; })
.append("path")
.attr("class", "path");
simulation.nodes(data);
simulation.restart();
}();
function ticked() {
var node = nodes.selectAll("g");
var diagram = voronoi(node.data()).polygons();
paths.selectAll("path")
.data(diagram)
.enter()
.append("clipPath")
.attr("id", function(d, i) { return "clip-" + i; })
.append("path")
.attr("class", "path");
paths.selectAll("path")
.attr("d", function(d) { return d == null ? null : "M" + d.join("L") + "Z"; });
node.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
node
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")" });
}
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
svg {
border: 1px solid #888888;
}
circle {
r: 3;
cursor: move;
fill: black;
}
.node {
pointer-events: all;
}
path {
fill: none;
stroke: #999;
pointer-events: all;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.1/d3.js"></script>
<svg width="400" height="400"></svg>
(Separate question, but nesting the paths in the g elements as in the Circle Dragging IV element causes undesired positioning of the paths off to the side of the graph.)
In a related question, using polygons instead of paths and clippaths, I can get the dragging to work, but am trying to use the clippath version as a comparison and not sure what are the differences, other than clippath seems to be preferred by Mike Bostock (d3 creator).
If the goal is:
is to combine d3 force simulation, g elements, and voronoi polygons to
make trigger events on nodes easier, such as dragging, mouseovers,
tooltips and so on with a graph that can be dynamically updated.
I'm going to step back a bit from the specifics of your code and try to get to the goal. I will use two primary sources (one which you reference) in this attempt to get there (and I may be way off base in doing so).
Source one: Mike Bostock's block circle dragging example.
Source two: Mike Bostock's Force-directed Graph example.
I hope that this approach at least helps to get to your goal (I took it partly as I was having difficulty with your snippet). It should be useful as a minimal example and proof of concept.
As with you, I'll use the circle dragging example as the foundation, and then I'll try to incorporate the force-directed example.
The key portions of the force directed graph that need to be imported are defining the simulation:
var simulation = d3.forceSimulation()
Assigning the nodes:
simulation
.nodes(circle)
.on("tick", ticked);
( .nodes(graph.nodes) in original )
Instructing what to do on tick:
force.nodes(circles)
.on('tick',ticked);
The ticked function:
function ticked() {
circle.selectAll('circle')
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
}
( we don't need the link portion, and we want to update the circles (rather than a variable named node )
And the portions that fall in the drag events.
If we import all that into a snippet (combining drag events, adding a ticked function, and we get:
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height"),
radius = 32;
var simulation = d3.forceSimulation()
.force("charge", d3.forceManyBody())
var circles = d3.range(20).map(function() {
return {
x: Math.round(Math.random() * (width - radius * 2) + radius),
y: Math.round(Math.random() * (height - radius * 2) + radius)
};
});
var color = d3.scaleOrdinal()
.range(d3.schemeCategory20);
var voronoi = d3.voronoi()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.extent([[-1, -1], [width + 1, height + 1]]);
var circle = svg.selectAll("g")
.data(circles)
.enter().append("g")
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
var cell = circle.append("path")
.data(voronoi.polygons(circles))
.attr("d", renderCell)
.attr("id", function(d, i) { return "cell-" + i; });
circle.append("clipPath")
.attr("id", function(d, i) { return "clip-" + i; })
.append("use")
.attr("xlink:href", function(d, i) { return "#cell-" + i; });
circle.append("circle")
.attr("clip-path", function(d, i) { return "url(#clip-" + i + ")"; })
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", radius)
.style("fill", function(d, i) { return color(i); });
simulation
.nodes(circles)
.on("tick", ticked);
function ticked() {
circle.selectAll('circle')
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
}
function dragstarted(d) {
d3.select(this).raise().classed("active", true);
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d3.select(this).select("circle").attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y);
cell = cell.data(voronoi.polygons(circles)).attr("d", renderCell);
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d, i) {
d3.select(this).classed("active", false);
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
function renderCell(d) {
return d == null ? null : "M" + d.join("L") + "Z";
}
path {
pointer-events: all;
fill: none;
stroke: #666;
stroke-opacity: 0.2;
}
.active circle {
stroke: #000;
stroke-width: 2px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.min.js"></script>
<svg width="600" height="400"></svg>
The obvious problem is that the cells don't update unless there is a drag. To solve this we just need to take the line that updates the cells on drag and put it in the ticked function so it updates on tick:
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height"),
radius = 32;
var simulation = d3.forceSimulation()
.force("charge", d3.forceManyBody())
var circles = d3.range(20).map(function() {
return {
x: Math.round(Math.random() * (width - radius * 2) + radius),
y: Math.round(Math.random() * (height - radius * 2) + radius)
};
});
var color = d3.scaleOrdinal()
.range(d3.schemeCategory20);
var voronoi = d3.voronoi()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.extent([[-1, -1], [width + 1, height + 1]]);
var circle = svg.selectAll("g")
.data(circles)
.enter().append("g")
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
var cell = circle.append("path")
.data(voronoi.polygons(circles))
.attr("d", renderCell)
.attr("id", function(d, i) { return "cell-" + i; });
circle.append("clipPath")
.attr("id", function(d, i) { return "clip-" + i; })
.append("use")
.attr("xlink:href", function(d, i) { return "#cell-" + i; });
circle.append("circle")
.attr("clip-path", function(d, i) { return "url(#clip-" + i + ")"; })
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", radius)
.style("fill", function(d, i) { return color(i); });
circle.append("text")
.attr("clip-path", function(d, i) { return "url(#clip-" + i + ")"; })
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; })
.attr("dy", '0.35em')
.attr("text-anchor", function(d) { return 'middle'; })
.attr("opacity", 0.6)
.style("font-size", "1.8em")
.style("font-family", "Sans-Serif")
.text(function(d, i) { return i; })
simulation
.nodes(circles)
.on("tick", ticked);
function ticked() {
circle.selectAll('circle')
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
circle.selectAll('text')
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; });
cell = cell.data(voronoi.polygons(circles)).attr("d", renderCell);
}
function dragstarted(d) {
d3.select(this).raise().classed("active", true);
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d3.select(this).select("circle").attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y);
cell = cell.data(voronoi.polygons(circles)).attr("d", renderCell);
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d, i) {
d3.select(this).classed("active", false);
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
function renderCell(d) {
return d == null ? null : "M" + d.join("L") + "Z";
}
path {
pointer-events: all;
fill: none;
stroke: #666;
stroke-opacity: 0.2;
}
.active circle {
stroke: #000;
stroke-width: 2px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.min.js"></script>
<svg width="600" height="400"></svg>
update: updating nodes:
Adding and removing nodes is where it got complicated for me at least. The primary issue was that the code above rearranged the svg groups with d3.selection.raise() on drag events, which could mess up my clip path ordering if using only the data element increment. Likewise with removing items from within the middle of the array, this would cause pairing issues between cells, groups, and circles. This pairing was the primary challenge - along with ensuring any appended nodes were in the proper parent and in the right order.
To solve the pairing issues, I used a new property in the data to use as an identifier, rather than the increment. Secondly, I do a couple specific manipulations of the cells when adding: ensuring they are in the right parent and that the cell appears above the circle in the DOM (using d3.selection.lower()).
Note: I haven't managed a good way to remove a circle and keep the voronoi working with a typical update cycle, so I've just recreated for each removal - and since as far as I know the Voronoi is recalculated every tick, this shouldn't be an issue.
The result is (click to remove/add, click the button to toggle remove/add):
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height"),
radius = 32;
var n = 0;
var circles = d3.range(15).map(function() {
return {
n: n++,
x: Math.round(Math.random() * (width - radius * 2) + radius),
y: Math.round(Math.random() * (height - radius * 2) + radius)
};
});
// control add/remove
var addNew = false;
d3.select('#control').append('input')
.attr('type','button')
.attr('value', addNew ? "Add" : "Remove")
.on('click', function(d) {
addNew = !addNew;
d3.select(this).attr('value', addNew ? "Add" : "Remove")
d3.selectAll('g').on('click', (addNew) ? add : remove);
});
var color = d3.scaleOrdinal()
.range(d3.schemeCategory20);
var voronoi = d3.voronoi()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.extent([[-1, -1], [width + 1, height + 1]]);
var circle = svg.selectAll("g")
.data(circles)
.enter().append("g")
.attr('id',function(d) { return 'g-'+d.n })
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.on('click', (addNew) ? add : remove);
var cell = circle.append("path")
.data(voronoi.polygons(circles))
.attr("d", renderCell)
.attr("class","cell")
.attr("id", function(d) { return "cell-" + d.data.n; });
circle.append("clipPath")
.attr("id", function(d) { return "clip-" + d.n; })
.append("use")
.attr("xlink:href", function(d) { return "#cell-" + d.n; });
circle.append("circle")
.attr("clip-path", function(d) { return "url(#clip-" + d.n + ")"; })
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", radius)
.style("fill", function(d) { return color(d.n); });
circle.append("text")
.attr("clip-path", function(d, i) { return "url(#clip-" + i + ")"; })
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; })
.attr("dy", '0.35em')
.attr("text-anchor", function(d) { return 'middle'; })
.attr("opacity", 0.6)
.style("font-size", "1.8em")
.style("font-family", "Sans-Serif")
.text(function(d) { return d.n; })
var simulation = d3.forceSimulation()
.nodes(circles)
.force('charge', d3.forceManyBody());
simulation.nodes(circles)
.on('tick',ticked);
function ticked() {
circle.selectAll('circle')
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
circle.selectAll('text')
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; });
cell = cell.data(voronoi.polygons(circles)).attr("d", renderCell);
}
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d3.select(this).select("circle").attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y);
cell = cell.data(voronoi.polygons(circles)).attr("d", renderCell);
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
function remove () {
d3.select(this).raise();
var id = d3.select(this).attr('id').split('-')[1];
id = +id;
// Get the clicked item:
var index = circles.map(function(d) {
return d.n;
}).indexOf(id);
circles.splice(index,1);
// Update circle data:
var circle = svg.selectAll("g")
.data(circles);
circle.exit().remove();
circle.selectAll("clipPath").exit().remove();
circle.selectAll("circle").exit().remove();
circle.selectAll("text").exit().remove();
//// Update voronoi:
d3.selectAll('.cell').remove();
cell = circle.append("path")
.data(voronoi.polygons(circles))
.attr("d", renderCell)
.attr("class","cell")
.attr("id", function(d) { return "cell-" + d.data.n; });
simulation.nodes(circles)
.on('tick',ticked);
}
function add() {
// Add circle to circles:
var coord = d3.mouse(this);
var newIndex = d3.max(circles, function(d) { return d.n; }) + 1;
circles.push({x: coord[0], y: coord[1], n: newIndex });
// Enter and Append:
circle = svg.selectAll("g").data(circles).enter()
var newCircle = circle.append("g")
.attr('id',function(d) { return 'g-'+d.n })
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.on('click',add)
cell = circle.selectAll("path")
.data(voronoi.polygons(circles)).enter();
cell.select('#g-'+newIndex).append('path')
.attr("d", renderCell)
.attr("class","cell")
.attr("id", function(d) { return "cell-" + d.data.n; });
newCircle.data(circles).enter();
newCircle.append("clipPath")
.attr("id", function(d) { return "clip-" + d.n; })
.append("use")
.attr("xlink:href", function(d) { return "#cell-" + d.n; });
newCircle.append("circle")
.attr("clip-path", function(d) { return "url(#clip-" + d.n + ")"; })
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", radius)
.style("fill", function(d) { return color(d.n); });
newCircle.append("text")
.attr("clip-path", function(d) { return "url(#clip-" + d.n + ")"; })
.attr("x", function(d) { return d.x; })
.attr("y", function(d) { return d.y; })
.attr("dy", '0.35em')
.attr("text-anchor", function(d) { return 'middle'; })
.attr("opacity", 0.6)
.style("font-size", "1.8em")
.style("font-family", "Sans-Serif")
.text(function(d) { return d.n; })
cell = d3.selectAll('.cell');
d3.select("#cell-"+newIndex).lower(); // ensure the path is above the circle in svg.
simulation.nodes(circles)
.on('tick',ticked);
}
function renderCell(d) {
return d == null ? null : "M" + d.join("L") + "Z";
}
.cell {
pointer-events: all;
fill: none;
stroke: #666;
stroke-opacity: 0.2;
}
.active circle {
stroke: #000;
stroke-width: 2px;
}
svg {
background: #eeeeee;
}
<script src="https://d3js.org/d3.v4.min.js"></script>
<div id="control"> </div>
<svg width="960" height="500"></svg>
In terms of specific parts of your question, I found that the dragging and clip path issues in the first two bullets of your question were a largely problem of pairing clip paths, cells, and circles as well as finding the right manner in which to add new elements to the chart - which I hope I demonstrated above.
I hope this is last snippet is closer to the specific problems you were encountering, and I hope that the code above is clear - but it likely went from the clear and concise Bostockian to some other lower standard.
Block version.
Why does dragging not trigger on the cells?
Because if the cell attribute has fill:none, then it must have pointer-events:all.
Why do the nodes become obscured and the paths lose their styles on
edges?
Because the clip path was targeting the g elements position instead of the circles position.
How can this be fixed to drag the nodes and trigger events on
them like mouseovers?
use path attr pointer-events: all, path { pointer-events: all; }
select the desired child element such as circle, or text, in the drag or tick event for positioning parent.select(child).attr('d' function(d) { ..do stuff.. });
use node id's for references to simplify data array updates or deletions node.data(data, function(d) { return d.id; })
Thanks Andrew Reid for your help.
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height"),
color = d3.scaleOrdinal(d3.schemeCategory10);
var a = {id: "a"},
b = {id: "b"},
c = {id: "c"},
data = [a, b, c],
links = [];
var simulation = d3.forceSimulation(data)
.force("charge", d3.forceManyBody().strength(-10))
.force("link", d3.forceLink(links).distance(200))
.force("center", d3.forceCenter(width / 2, height / 2))
.alphaTarget(1)
.on("tick", ticked);
var link = svg.append("g").attr("class", "links").selectAll(".link"),
node = svg.append("g").attr("class", "nodes").selectAll(".node");
var voronoi = d3.voronoi()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.extent([[-1, 1], [width + 1, height + 1]]);
update();
d3.timeout(function() {
links.push({source: a, target: b}); // Add a-b.
links.push({source: b, target: c}); // Add b-c.
links.push({source: c, target: a}); // Add c-a.
update();
}, 1000);
d3.interval(function() {
data.pop(); // Remove c.
links.pop(); // Remove c-a.
links.pop(); // Remove b-c.
update();
}, 5000, d3.now());
d3.interval(function() {
data.push(c); // Re-add c.
links.push({source: b, target: c}); // Re-add b-c.
links.push({source: c, target: a}); // Re-add c-a.
update();
}, 5000, d3.now() + 1000);
function update() {
node = node.data(data, function(d) { return d.id; });
node.exit().remove();
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.on("mouseover", mouseover)
.on("mouseout", mouseout);
nodeEnter.append("circle").attr("fill", function(d) { return color(d.id); }).attr("r", 8);
nodeEnter.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.id; });
nodeEnter.append("path").attr("class", "path");
nodeEnter.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
node = node.merge(nodeEnter);
// Apply the general update pattern to the links.
link = link.data(links, function(d) { return d.source.id + "-" + d.target.id; });
link.exit().remove();
link = link.enter().append("line").merge(link);
// Update and restart the simulation.
simulation.nodes(data);
simulation.force("link").links(links);
simulation.alpha(1).restart();
}
function mouseover(d) {
d3.select(this).raise().classed("active", true);
}
function mouseout(d) {
d3.select(this).raise().classed("active", false);
}
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d3.select(this).select("circle").attr("cx", d.fx = d3.event.x).attr("cy", d.fy = d3.event.y);
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
function ticked() {
node.select("circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
node.select("path")
.data(voronoi.polygons(data))
.attr("d", function(d) { return d == null ? null : "M" + d.join("L") + "Z"; });
node.select("text")
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")" });
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; });
}
path {
pointer-events: all;
fill: none;
stroke: #666;
stroke-opacity: 0.2;
}
.active path {
fill: #111;
opacity: 0.05;
}
.active text {
visibility: visible;
}
.active circle {
stroke: #000;
stroke-width: 1.5px;
}
svg {
border: 1px solid #888;
}
.links {
stroke: #000;
stroke-width: 1.5;
}
.nodes {
stroke-width: 1.5;
}
text {
pointer-events: none;
font: 1.8em sans-serif;
visibility: hidden;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.min.js"></script>
<svg width="400" height="400"></svg>