我刚开始涉足网络可视化，所以我完全是新手。我的目标是显示一个家庭树，其中一个根节点将同时具有多个父节点和多个子节点。在寻找解决方案时，我发现了这个示例：http ://bl.ocks.org/jdarling/2503502 这很棒，因为它似乎具有我需要的功能。但是，我想改变方向（从上到下）。我尝试使用以下示例这样做：http: //bl.ocks.org/mbostock/3184089但失败了。
我的代码：
var tree = d3.layout.tree()
.size([height, width]);
var diagonal = d3.svg.diagonal()
.projection(function(d) {
return [d.x, d.y];
});
var elbow = function (d, i){
var source = calcTop(d.source);
var target = calcTop(d.target);
var hx = (target.x-source.x)/2;
if(d.isRight)
hx = -hx;
return "M" + source.x + "," + source.y
+ "H" + (source.x+hx)
+ "V" + target.y + "H" + target.x;
};
var connector = elbow;
var calcTop = function(d){
var top = d.x;
if(!d.isRight){
top = d.x-halfHeight;
top = halfHeight - top;
}
return {x : top, y : d.y};
};
var vis = d3.select("#chart")
.append("svg")
.attr("height", height + margin.top + margin.bottom)
.attr("width", width + margin.right + margin.left)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.json("tree.json", function(json) {
root = json;
root.x0 = height / 2;
root.y0 = width / 2;
var t1 = d3.layout.tree()
.size([halfHeight, width])
.children(function(d){
return d.winners;
});
var t2 = d3.layout.tree()
.size([halfHeight, width])
.children(function(d){
return d.challengers;
});
t1.nodes(root);
t2.nodes(root);
var rebuildChildren = function(node){
node.children = getChildren(node);
if(node.children)
node.children.forEach(rebuildChildren);
}
rebuildChildren(root);
root.isRight = false;
update(root);
});
var toArray = function(item, arr){
arr = arr || [];
var i = 0, l = item.children?item.children.length:0;
arr.push(item);
for(; i < l; i++){
toArray(item.children[i], arr);
}
return arr;
};
function update(source) {
// Compute the new tree layout.
var nodes = toArray(source);
// Normalize for fixed-depth.
nodes.forEach(function(d) { d.x = d.depth * 180 + halfHeight; });
// Update the nodes…
var node = vis.selectAll("g.node")
.data(nodes, function(d) { return d.id || (d.id = ++i); });
// Enter any new nodes at the parent's previous position.
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) {
return "translate(" + source.x0 + "," + source.y0 + ")";
})
.on("click", click);
nodeEnter.append("circle")
.attr("r", 1e-6)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});
nodeEnter.append("text")
.attr("dy", function(d) { return d.isRight?14:-8;})
.attr("text-anchor", "middle")
.text(function(d) { return d.name; })
.style("fill-opacity", 1e-6);
// Transition nodes to their new position.
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function(d) {
p = calcTop(d);
return "translate(" + p.x + "," + p.y + ")";
});
nodeUpdate.select("circle")
.attr("r", 4.5)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});
nodeUpdate.select("text")
.style("fill-opacity", 1);
// Transition exiting nodes to the parent's new position.
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
p = calcTop(d.parent||source);
return "translate(" + p.x + "," + p.y + ")";
})
.remove();
nodeExit.select("circle")
.attr("r", 1e-6);
nodeExit.select("text")
.style("fill-opacity", 1e-6);
// Update the links...
var link = vis.selectAll("path.link")
.data(tree.links(nodes), function(d) { return d.target.id; });
// Enter any new links at the parent's previous position.
link.enter().insert("path", "g")
.attr("class", "link")
.attr("d", function(d) {
var o = {x: source.x0, y: source.y0};
return connector({source: o, target: o});
});
// Transition links to their new position.
link.transition()
.duration(duration)
.attr("d", connector);
// Transition exiting nodes to the parent's new position.
link.exit()
.transition()
.duration(duration)
.attr("d", function(d) {
var o = calcTop(d.source||source);
if(d.source.isRight)
o.x -= halfHeight - (d.target.x - d.source.x);
else
o.x += halfHeight - (d.target.x - d.source.x);
return connector({source: o, target: o});
})
.remove();
// Stash the old positions for transition.
nodes.forEach(function(d) {
var p = calcTop(d);
d.x0 = p.x;
d.y0 = p.y;
});
// 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(source);
} }
非常感谢您的帮助！
