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我试图找到一种方法将自动缩放添加到当前的代码。通常的缩放平移工作正常。但是，当一棵树中的节点数量很多时，就会被角落切断。无论如何，只要树通过svg的宽度和高度的边界，就会自动缩放。也许基于深度大小或节点的总数。D3Js树布局自动缩放功能
function buildTree(treeData){
var contextMenuList = [
{
title: 'Remove Node',
action: function(elm, d, i) {
if (d.parent && d.parent.children){
var nodeToDelete = _.where(d.parent.children, {name: d.name});
if (nodeToDelete){
d.parent.children = _.without(d.parent.children, nodeToDelete[0]);
}
update(d);
}
}
},
{
title: 'Synopsis',
action: function(elm, d, i) {
console.log("Option 2 clicked");
console.log("Node Name: "+ d.name);
setNodeTopic(d.name);
}
}
];
var margin = {top:40, right:120,bottom:20,left:20};
var width = 960 - margin.right - margin.left;
var height = 900 - margin.top - margin.bottom;
var i = 0,duration = 750;
//refers to the tree itself
var tree = d3.layout.tree()
.size([height,width])
.nodeSize([100,100]);
var diagonal = d3.svg.diagonal()
.projection(function(d){
return [d.x, d.y];
});
//refers to the rectangle outside
var zm;
var svg = d3.select("#tree").append("svg")
.attr("width",width+margin.right+margin.left)
.attr("height",height+margin.top+margin.bottom)
.append("svg:g")
.attr("transform","translate("+margin.left+","+margin.top+")")
.call(zm = d3.behavior.zoom().scaleExtent([0.5,2]).on("zoom", redraw)).append("g")
.attr("transform","translate("+400+","+50+")");
zm.translate([400,20]);
var root = treeData;
function autoOpen(head, time) {
window.setTimeout(function() {
nodeclick(head); //do node click
if (head._children) {
//if has children
var timeOut = 1000; //set the timout variable
head._children.forEach(function(child) {
autoOpen(child, timeOut); //open the child recursively
timeOut = timeOut + 1000;
})
}
}, time);
}
autoOpen(root,1000);
update(root);
function update(source){
var nodes = tree.nodes(root).reverse(),
links = tree.links(nodes);
nodes.forEach(function(d){
d.y = d.depth * 150;
});
var node = svg.selectAll("g.node")
.data(nodes,function(d){
return d.id || (d.id = ++ i);
});
var nodeEnter = node.enter().append("svg:g")
.attr("class","node")
.attr("transform",function(d){
if(!source.x0 && !source.y0)
return "";
return "translate("+source.x0 + "," + source.y0 + ")";
})
.on("click",nodeClick)
.on('contextmenu', d3.contextMenu(contextMenuList));
nodeEnter.append("circle")
.attr("r",50)
.attr("stroke",function(d){
return d.children || d._children ? "steelblue" : "#00c13f";
})
.style("fill",function(d){
return d.children || d._children ? "lightsteelblue" : "#fff";
})
nodeEnter.append("text")
.attr("y",function(d){
//return d.children || d._children ? -18 : 18;
return -10;
})
.attr("dy",".35em")
.attr("text-anchor","middle")
.style("fill-opacity",1e-6)
.each(function (d) {
var arr = d.name.split(" ");
for (i = 0; i < arr.length; i++) {
d3.select(this).append("tspan")
.text(arr[i])
.attr("dy", i ? "1.2em" : 0)
.attr("x", 0)
.attr("text-anchor", "middle")
.attr("class", "tspan" + i);
}
});
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform",function(d){
return "translate(" + d.x + "," + d.y + ")";
});
nodeUpdate.select("circle")
.attr("r",50)
.style("fill",function(d){
return d._children ? "lightsteelblue" : "#fff";
});
nodeUpdate.select("text")
.style("fill-opacity",1);
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform",function(d){
return "translate("+ source.x+","+source.y+")";
})
.remove();
nodeExit.select("circle")
.attr("r",1e-6);
nodeExit.select("text")
.style("fill-opacity",1e-6);
var link = svg.selectAll("path.link")
.data(links,function(d){
return d.target.id;
});
link.enter().insert("svg:path","g")
.attr("class","link")
.attr("d",function(d){
if(!source.x0 && !source.y0)
return "";
var o = {x:source.x0,y:source.y0};
return diagonal({source:o,target:o});
});
link.transition()
.duration(duration)
.attr("d",diagonal);
link.exit().transition()
.duration(duration)
.attr("d",function(d){
var o = {x:source.x,y:source.y};
return diagonal({source:o,target:o});
})
.remove();
nodes.forEach(function(d){
d.x0 = d.x;
d.y0 = d.y;
});
}
function nodeClick(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update(d);
}
function redraw() {
svg.attr("transform",
"translate(" + d3.event.translate + ")"
+ " scale(" + d3.event.scale + ")");
}
}
buildTree(that.objectList);
};