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javascript - v4 中的 d3 缩放功能问题

转载 作者:数据小太阳 更新时间:2023-10-29 06:14:53 24 4
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我在使用 v4 时遇到 D3 中的缩放功能问题。它抛出一个错误,指出 zoom.translate 未定义。我主要使用此答案中的以下代码 d3 focus on node on click ,这对 v3 非常有效。但是,由于我在使用 v3 时遇到问题,因为它对源和节点采用字符串形式(而不是索引)的数据有限制 D3 JSON file with source and index as strings rather than indices ,我切换到 v4.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.links line {
stroke: #999;
stroke-opacity: 0.6;
}

.nodes circle {
stroke: #fff;
stroke-width: 1.5px;
}

</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>


var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height")
active = d3.select(null);

var zoom = d3.zoom()
.scaleExtent([1, 8])
.on("zoom", zoomed);

var color = d3.scaleOrdinal(d3.schemeCategory20);

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));

d3.json("graph.json", function(error, graph) {
if (error) throw error;

var link = svg.append("g")
.attr("class", "links")
.selectAll("line")
.data(graph.links)
.enter().append("line")
.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("r", 5)
.attr("fill", function(d) { return color(d.group); })
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.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; });
}
});

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 clicked(d){
if (active.node() === this) return reset();
active.classed("active", false);
active = d3.select(this).classed("active", true);

var bbox = active.node().getBBox(),
bounds = [[bbox.x, bbox.y],[bbox.x + bbox.width, bbox.y + bbox.height]];

var dx = bounds[1][0] - bounds[0][0],
dy = bounds[1][1] - bounds[0][1],
x = (bounds[0][0] + bounds[1][0]) / 2,
y = (bounds[0][1] + bounds[1][1]) / 2,
scale = Math.max(1, Math.min(8, 0.9 / Math.max(dx / width, dy / height))),
translate = [width / 2 - scale * x, height / 2 - scale * y];

svg.transition()
.duration(750)
.call(zoom.translate(translate).scale(scale).event);
}

function reset() {
active.classed("active", false);
active = d3.select(null);

svg.transition()
.duration(750)
.call(zoom.translate([0, 0]).scale(1).event);
}

function zoomed() {
console.log(d3.event)
g.style("stroke-width", 1.5 / d3.event.scale + "px");
g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
}

</script>

我将 d3.behaviour.zoom() 更改为 d3.zoom() 甚至更改了

.call(zoom.translate(translate).scale(scale).event);

.call(d3.zoom().on("zoom", function () {
svg.attr("transform", d3.event.transform)
}));

这会抛出一个奇怪的错误,error: unknown type: wheel

克服这种情况的最佳方法是什么?

最佳答案

d3 版本 4 中,正确的做法是:

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')))
);
}

缩放处理程序在哪里:

function zoomed() {
g.attr("transform", d3.event.transform);
}

注意,我根据之前的回答简化了转换计算。那里的边界计算并不是真正必要的。


完整代码:

<!DOCTYPE html>
<meta charset="utf-8">
<style>
.links line {
stroke: #aaa;
}

.nodes circle {
pointer-events: all;
stroke: none;
stroke-width: 40px;
}

.active {
fill: yellow;
}
</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");

var zoom = d3.zoom()
.scaleExtent([1 / 2, 4])
.on("zoom", zoomed);

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;
});
}

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>

关于javascript - v4 中的 d3 缩放功能问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41918012/

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