I have a large number of nodes to display on the page, most of the times the circles goes off the visible area of the screen due to node placements.
Is there a way to set the initial zoom level based on the whole boundary box of nodes dynamically so that all the nodes fits on the visible area of the screen?
Updated:
I have added a fiddle for this https://jsfiddle.net/navinleon/6ygaxoyq/3/
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var zoom = d3.zoom()
.scaleExtent([-8 / 2, 4])
.on("zoom", zoomed);
svg.call(zoom);
var g = svg.append("g");
var simulation = d3.forceSimulation()
.force("link", d3.forceLink().id(function(d) {
return d.id;
}))
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));
var graph = {
"nodes": [{
"id": "Myriel",
"group": 1
}, {
"id": "Napoleon",
"group": 1
}, {
"id": "Mlle.Baptistine",
"group": 1
}, {
"id": "Mme.Magloire",
"group": 1
}, {
"id": "CountessdeLo",
"group": 1
}, {
"id": "Geborand",
"group": 1
}, {
"id": "Champtercier",
"group": 1
}, {
"id": "Cravatte",
"group": 1
}, {
"id": "Count",
"group": 1
}, {
"id": "OldMan",
"group": 1
}, {
"id": "Labarre",
"group": 2
}, {
"id": "Valjean",
"group": 2
}, {
"id": "Marguerite",
"group": 3
}, {
"id": "Mme.deR",
"group": 2
}, {
"id": "Isabeau",
"group": 2
}, {
"id": "Gervais",
"group": 2
}, {
"id": "Tholomyes",
"group": 3
}, {
"id": "Listolier",
"group": 3
}, {
"id": "Fameuil",
"group": 3
}, {
"id": "Blacheville",
"group": 3
}, {
"id": "Favourite",
"group": 3
}, {
"id": "Dahlia",
"group": 3
}, {
"id": "Zephine",
"group": 3
}, {
"id": "Fantine",
"group": 3
}, {
"id": "Mme.Thenardier",
"group": 4
}, {
"id": "Thenardier",
"group": 4
}, {
"id": "Cosette",
"group": 5
}, {
"id": "Javert",
"group": 4
}, {
"id": "Fauchelevent",
"group": 0
}, {
"id": "Bamatabois",
"group": 2
}, {
"id": "Perpetue",
"group": 3
}, {
"id": "Simplice",
"group": 2
}, {
"id": "Scaufflaire",
"group": 2
}, {
"id": "Woman1",
"group": 2
}, {
"id": "Judge",
"group": 2
}, {
"id": "Champmathieu",
"group": 2
}, {
"id": "Brevet",
"group": 2
}, {
"id": "Chenildieu",
"group": 2
}, {
"id": "Cochepaille",
"group": 2
}, {
"id": "Pontmercy",
"group": 4
}, {
"id": "Boulatruelle",
"group": 6
}, {
"id": "Eponine",
"group": 4
}, {
"id": "Anzelma",
"group": 4
}, {
"id": "Woman2",
"group": 5
}, {
"id": "MotherInnocent",
"group": 0
}, {
"id": "Gribier",
"group": 0
}, {
"id": "Jondrette",
"group": 7
}, {
"id": "Mme.Burgon",
"group": 7
}, {
"id": "Gavroche",
"group": 8
}, {
"id": "Gillenormand",
"group": 5
}, {
"id": "Magnon",
"group": 5
}, {
"id": "Mlle.Gillenormand",
"group": 5
}, {
"id": "Mme.Pontmercy",
"group": 5
}, {
"id": "Mlle.Vaubois",
"group": 5
}, {
"id": "Lt.Gillenormand",
"group": 5
}, {
"id": "Marius",
"group": 8
}, {
"id": "BaronessT",
"group": 5
}, {
"id": "Mabeuf",
"group": 8
}, {
"id": "Enjolras",
"group": 8
}, {
"id": "Combeferre",
"group": 8
}, {
"id": "Prouvaire",
"group": 8
}, {
"id": "Feuilly",
"group": 8
}, {
"id": "Courfeyrac",
"group": 8
}, {
"id": "Bahorel",
"group": 8
}, {
"id": "Bossuet",
"group": 8
}, {
"id": "Joly",
"group": 8
}, {
"id": "Grantaire",
"group": 8
}, {
"id": "MotherPlutarch",
"group": 9
}, {
"id": "Gueulemer",
"group": 4
}, {
"id": "Babet",
"group": 4
}, {
"id": "Claquesous",
"group": 4
}, {
"id": "Montparnasse",
"group": 4
}, {
"id": "Toussaint",
"group": 5
}, {
"id": "Child1",
"group": 10
}, {
"id": "Child2",
"group": 10
}, {
"id": "Brujon",
"group": 4
}, {
"id": "Mme.Hucheloup",
"group": 8
}],
"links": [{
"source": "Napoleon",
"target": "Myriel",
"value": 1
}, {
"source": "Mlle.Baptistine",
"target": "Myriel",
"value": 8
}, {
"source": "Mme.Magloire",
"target": "Myriel",
"value": 10
}]
}
var link = g.append("g")
.attr("class", "links")
.selectAll("line")
.data(graph.links)
.enter().append("line");
var node = g.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(graph.nodes)
.enter().append("circle")
.attr("r", 2.5)
.on('click', clicked);
node.append("title")
.text(function(d) {
return d.id;
});
simulation
.nodes(graph.nodes)
.on("tick", ticked);
simulation.force("link")
.links(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;
})
.attr('r',20)
}
var active = d3.select(null);
function clicked(d) {
if (active.node() === this){
active.classed("active", false);
return reset();
}
active = d3.select(this).classed("active", true);
svg.transition()
.duration(750)
.call(zoom.transform,
d3.zoomIdentity
.translate(width / 2, height / 2)
.scale(8)
.translate(-(+active.attr('cx')), -(+active.attr('cy')))
);
}
function reset() {
svg.transition()
.duration(750)
.call(zoom.transform,
d3.zoomIdentity
.translate(0, 0)
.scale(1)
);
}
function zoomed() {
g.attr("transform", d3.event.transform);
}<script src="https://d3js.org/d3.v5.min.js"></script>
<svg width="960" height="600"></svg>Expected:
