我正在尝试修改此处D3示例(https://bl.ocks.org/mbostock/1062288)中的代码,以直观地显示边缘方向和节点文本。但是到目前为止,我还没有完成,甚至没有删除节点。下面是我玩的代码。
我认为生成svg的方式不正确,因此无法显示我想要的内容。对不起,我的JavaScript技术。谢谢
var w = 1280,
h = 800,
node,
link,
root;
var force = d3.layout.force()
.on("tick", tick)
.charge(function(d) {
return d._children ? -d.size / 100 : -30;
})
.linkDistance(function(d) {
return d.target._children ? 80 : 30;
})
.size([w, h - 160]);
var vis = d3.select("body").append("svg:svg")
.attr("width", w)
.attr("height", h);
d3.json("https://raw.githubusercontent.com/d3/d3-hierarchy/master/test/data/flare.json", function(json) {
root = json;
root.fixed = true;
root.x = w / 2;
root.y = h / 2 - 80;
update();
});
function update() {
var nodes = flatten(root),
links = d3.layout.tree().links(nodes);
// Restart the force layout.
force
.nodes(nodes)
.links(links)
.start();
// Update the links…
link = vis.selectAll("line.link")
.data(links, function(d) {
return d.target.id;
});
// Enter any new links.
link.enter().insert("svg:line", ".node")
.attr("class", "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;
});
// Exit any old links.
link.exit().remove();
// Update the nodes…
node = vis.selectAll("circle.node")
.data(nodes, function(d) {
return d.id;
});
//.style("fill", color);
node.transition()
.attr("r", function(d) {
return d.children ? 4.5 : Math.sqrt(d.size) / 10;
});
// Enter any new nodes.
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.on("click", click)
.call(force.drag);
nodeEnter.append("circle")
.attr("cx", function(d) {
return d.x;
})
.attr("cy", function(d) {
return d.y;
})
.attr("r", function(d) {
return d.children ? 4.5 : Math.sqrt(d.size) / 10;
})
.style("fill", color)
.attr("r", function(d) {
return Math.sqrt(d.size) / 10 || 4.5;
});
nodeEnter.append("text")
.attr("dy", ".35em")
.text(function(d) {
return d.name;
});
// Exit any old nodes.
node.exit().remove();
}
function tick() {
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;
});
}
// Color leaf nodes orange, and packages white or blue.
function color(d) {
return d._children ? "#3182bd" : d.children ? "#c6dbef" : "#fd8d3c";
}
// Toggle children on click.
function click(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update();
}
// Returns a list of all nodes under the root.
function flatten(root) {
var nodes = [],
i = 0;
function recurse(node) {
if (node.children) node.size = node.children.reduce(function(p, v) {
return p + recurse(v);
}, 0);
if (!node.id) node.id = ++i;
nodes.push(node);
return node.size;
}
root.size = recurse(root);
return nodes;
}
.node {
cursor: pointer;
stroke: #3182bd;
stroke-width: 1.5px;
}
.link {
fill: none;
stroke: #9ecae1;
stroke-width: 1.5px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>