我在d3.js中使用简单的垂直树形图，其中我需要显示圆内每个节点的名称和计数。链接正在https://codesandbox.io/s/cool-field-vsc6m上运行。现在，该名称正显示在圈子之外。我想将节点的名称和计数包括在一个圆圈内
var treeData = {
name: "Top Level",
children: [
{
name: "Level 2: A",
count: 600,
children: [
{ name: "Son of A", count: 200 },
{ name: "Daughter of A", count: 300 }
]
},
{ name: "Level 2: B", count: 100 }
]
};
var margin = { top: 40, right: 90, bottom: 50, left: 90 },
width = 660 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// declares a tree layout and assigns the size
var treemap = d3.tree().size([width, height]);
// assigns the data to a hierarchy using parent-child relationships
var nodes = d3.hierarchy(treeData);
// maps the node data to the tree layout
nodes = treemap(nodes);
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3
.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom),
g = svg
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// adds the links between the nodes
var link = g
.selectAll(".link")
.data(nodes.descendants().slice(1))
.enter()
.append("path")
.attr("class", "link")
.attr("d", function(d) {
return (
"M" +
d.x +
"," +
d.y +
"C" +
d.x +
"," +
(d.y + d.parent.y) / 2 +
" " +
d.parent.x +
"," +
(d.y + d.parent.y) / 2 +
" " +
d.parent.x +
"," +
d.parent.y
);
});
// adds each node as a group
var node = g
.selectAll(".node")
.data(nodes.descendants())
.enter()
.append("g")
.attr("class", function(d) {
return "node" + (d.children ? " node--internal" : " node--leaf");
})
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
})
.on("mouseover", function(d) {
var g = d3.select(this); // The node
// The class is used to remove the additional text later
var info = g
.append("text")
.classed("info", true)
.attr("x", 20)
.attr("y", 10)
.text("More info");
})
.on("mouseout", function() {
// Remove the info text on mouse out.
d3.select(this)
.select("text.info")
.remove();
});
// adds the circle to the node
node.append("circle").attr("r", 10);
// adds the text to the node
node
.append("text")
.attr("dy", ".35em")
.attr("y", function(d) {
return d.children ? -20 : 20;
})
.style("text-anchor", "middle")
.text(function(d) {
return d.data.name;
});
我对您现有的代码进行了必要的更改，以显示圆内每个节点的名称和数量。
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<head>
<script src="http://d3js.org/d3.v5.min.js"></script>
<style>
.node {
cursor: pointer;
}
.tooltip {
position: relative;
display: inline-block;
border-bottom: 1px dotted black;
/* If you want dots under the hoverable text */
}
path.link {
fill: rgb(133, 129, 196);
stroke: #333;
stroke-width: 1.5px;
}
/* Tooltip text */
.tooltip .tooltiptext {
visibility: hidden;
width: 120px;
background-color: black;
color: #fff;
text-align: center;
padding: 5px 0;
border-radius: 6px;
/* Position the tooltip text - see examples below! */
position: absolute;
z-index: 1;
}
/* Show the tooltip text when you mouse over the tooltip container */
.tooltip:hover .tooltiptext {
visibility: visible;
}
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 3px;
}
.node text {
font: 12px sans-serif;
text-overflow: ellipsis;
white-space: nowrap;
}
.node--internal text {
text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 2px;
}
</style>
</head>
<body>
<script type="text/javascript">
var treeData = {
name: "Top Level",
count: 1200,
children: [
{
name: "Level 2: A",
count: 600,
children: [
{ name: "Son of A", count: 200 },
{ name: "Daughter of A", count: 300 }
]
},
{ name: "Level 2: B", count: 100 }
]
};
var margin = { top: 50, right: 90, bottom: 50, left: 90 },
width = 660 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// declares a tree layout and assigns the size
var treemap = d3.tree().size([width, height]);
// assigns the data to a hierarchy using parent-child relationships
var nodes = d3.hierarchy(treeData);
// maps the node data to the tree layout
nodes = treemap(nodes);
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3
.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom),
g = svg
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// adds the links between the nodes
var link = g
.selectAll(".link")
.data(nodes.descendants().slice(1))
.enter()
.append("path")
.attr("class", "link")
.attr("d", function(d) {
return (
"M" +
d.x +
"," +
d.y +
"C" +
d.x +
"," +
(d.y + d.parent.y) / 2 +
" " +
d.parent.x +
"," +
(d.y + d.parent.y) / 2 +
" " +
d.parent.x +
"," +
d.parent.y
);
});
// adds each node as a group
var node = g
.selectAll(".node")
.data(nodes.descendants())
.enter()
.append("g")
.attr("class", function(d) {
return "node" + (d.children ? " node--internal" : " node--leaf");
})
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
})
.on("mouseover", function(d) {
var g = d3.select(this); // The node
// The class is used to remove the additional text later
var info = g
.append("text")
.classed("info", true)
.attr("x", 20)
.attr("y", 10)
.text("More info");
})
.on("mouseout", function() {
// Remove the info text on mouse out.
d3.select(this)
.select("text.info")
.remove();
});
// adds the circle to the node
node.append("circle").attr("r", 45);
// adds the text to the node
node
.append("text")
.attr("dy", ".35em")
.attr("y", function(d) {
// return d.children ? -20 : 20;
return -10;
})
.style("text-anchor", "middle")
.text(function(d) {
return d.data.name;
});
node
.append("text")
.attr("dy", ".35em")
.attr("y", function(d) {
return 10;
})
.style("text-anchor", "middle")
.text(function(d) {
return d.data.count;
});
</script>
</body>
</html>