我使用 d3js 创建了一个树形布局图。节点可单击以切换显示子节点。子节点应插入到预定义的位置,然后转换到所需的位置。问题是插入坐标总是关闭的。使用 Firebug 进行调试时,它显示直接在附加新节点后,其坐标为 x = 51.42857142857142 和 y = 200.0,即使该行
.attr("transform", "translate(90,100)" )
应该改变它们(我在这里使用固定值,以进一步确定问题。
我的错误在哪里?
完整代码:
// Toggle children.
function toggle(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
}
function toggleAll(d) {
if (d.children) {
d.children.forEach(toggleAll);
toggle(d);
}
}
function update(source) {
// Node movement delay
var duration = d3.event && 1500;
// Compute the new tree layout.
var nodes = tree.nodes(root).reverse();
// Normalize for fixed-depth.
nodes.forEach(function(d) { d.y = d.depth * 100; });
// 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("svg:g")
.attr("class", "node")
.attr("transform", "translate(90,100)" )
.on("click", function(d) { toggle(d); update(d); });
nodeEnter.append("svg:circle")
.attr("r", 1e-6);
// Transition nodes to their new position.
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")"; })
nodeUpdate.select("circle")
.attr("r", 4.5)
.style("fill", function(d) { return d._children ? "red" : "#fff"; });
// Transition exiting nodes to the parent's new position.
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
.remove();
// While moving the nodes, they need to shrink
nodeExit.select("circle")
.attr("r", 1e-6);
// Stash the old positions for transition.
nodes.forEach(function(d) {
d.x0 = d.x;
d.y0 = d.y;
});
}
var i = 0, root;
var radius = 960 / 2;
var tree = d3.layout.tree()
.size([360, radius - 120]);
var diagonal = d3.svg.diagonal.radial()
.projection(function(d) { return [d.y, d.x / 180 * Math.PI]; });
var vis = d3.select("#body").append("svg:svg")
.attr("width", radius * 2)
.attr("height", radius * 2 - 50)
.append("g")
.attr("transform", "translate(" + radius + "," + radius + ")");
d3.json("flare.json", function(json) {
root = json;
root.x0 = 0;
root.y0 = 0;
// Initialize the display to show a few nodes.
root.children.forEach(toggleAll);
toggle(root.children[1]);
update(root);
});