问题
I implemented my own version of https://bl.ocks.org/mbostock/7607535, but I would like to fill in the white circles with colors representing the data I am dealing with. For example some of the children in my json look like this:
I would like to fill in the white circles with the numerical numbers displayed. I have access to those numbers in my code. Is there a way for me to fill in the color for each circle that can also represent negative numbers? In order to see a working version of this check out my website here and enter the following information into the form "Cuba", "Yearly", and "2016."
Here is my code:
var svg = d3.select("svg"),
margin = 20,
diameter = +svg.attr("width"),
g = svg.append("g").attr("transform", "translate(" + diameter / 2 + "," + diameter / 2 + ")");
var format = d3.format(",d")
var color = d3.scaleLinear()
.domain([-1, 5])
.range(["hsl(152,80%,80%)", "hsl(228,30%,40%)"])
.interpolate(d3.interpolateHcl);
var pack = d3.pack()
.size([diameter - margin, diameter - margin])
.padding(2);
var poot = {"name":"flare","children":[]}
$( "#target" ).click(function() {
var data = {};
data.country = $("#country").val();
data.timeframe = $("#timeframe").val();
data.eventdate = $("#eventdate").val();
$.ajax({
type : "POST",
url : "/overview",
data: JSON.stringify(data, null, '\t'),
contentType: 'application/json;charset=UTF-8',
success: function(result) {
//poot = add_simple(poot,result["result"])
draw(poot,result["result"]);
// poot = getData(poot,result["result"])
}
});
})
function draw(root,updates_dict){
function getData(json,dict_country){
function find_index(curr_json,country){
var country_children = curr_json["children"]
for (var i=0; i < country_children.length;i++){
if (country_children[i]["name"] == country){
return i
}
}
return -1
}
function event_children(event_dict){ //returns a list with event children
var time_lst = []
var event_names = Object.keys(event_dict)
for (var i = 0; i<event_names.length; i++){
var event_type = {}
event_type["name"] = event_names[i]
event_type["children"] = []
event_info = event_dict[event_names[i]]
// console.log(event_info)
total_topic = event_info["ArticleMentions"]
delete event_info["ArticleMentions"]
for (var key in event_info){
key_obj = {}
key_obj["name"] = key + " => " + event_info[key]
key_obj["size"] = total_topic / 2
event_type["children"].push(key_obj)
}
time_lst.push(event_type)
}
return time_lst
}
function add_child(insertname,bool,tot){
var new_add = {}
new_add["children"] = []
if (bool == true){
new_add["name"] = insertname + " => " + tot
}
else{
new_add["name"] = insertname
}
return new_add
}
var country = dict_country["Country"]
var timeframe = dict_country["Timeframe"]
var date = dict_country["Date"]
var total = dict_country["Total"]
var info = dict_country["Overview"]
var country_ind = find_index(json,country) //returns index of country
if (country_ind == -1){
var country_dict = add_child(country) //here {"name":Ecuador,"children":[]}
var timeframe_dict = add_child(timeframe) //here {"name":"Daily","children":[]}
var add_date = add_child(date,true,total) //here {"name":"20150709","children":[]}
add_date["children"] = event_children(info)
timeframe_dict["children"].push(add_date)
country_dict["children"].push(timeframe_dict)
json["children"].push(country_dict)
return json
}
else{ //the country exists
timeframe_ind = find_index(json["children"][country_ind],timeframe)
if (timeframe_ind == -1){
//create new timeframe and make the same additonas above
var new_timeframe = add_child(timeframe) //{"name": Daily, "children":[]}
var new_date = add_child(date,true,total) //{"name":date,children:[]}
new_date["children"] = event_children(info)
new_timeframe["children"].push(new_date)
json["children"][country_ind]["children"].push(new_timeframe)
return json
}
else{
var event_day = add_child(date,true,total)
event_day["children"] = event_children(info)
json["children"][country_ind]["children"][timeframe_ind]["children"].push(event_day)
return json
}
}
}
var root = getData(root,updates_dict)
root = d3.hierarchy(root)
.sum(function(d) { return d.size; })
.sort(function(a, b) { return b.value - a.value; });
var focus = root,
nodes = pack(root).descendants(),
view;
var circle = g.selectAll("circle")
.data(nodes,function(d){
return d.country; //I thinks this will fail
})
circle.exit().remove()
circle = circle.enter()
.append("circle")
.attr("class", function(d) { return d.parent ? d.children ? "node" : "node node--leaf" : "node node--root"; })
.style("fill", function(d) { return d.children ? color(d.depth) : null; })
.on("click", function(d) { if (focus !== d) zoom(d), d3.event.stopPropagation(); })
.merge(circle);
var text = g.selectAll("text")
.data(nodes,function(d){
return d.country;
})
text.exit().remove();
text = text.enter().append("text")
.attr("class", "label")
.merge(text)
text = text.style("fill-opacity", function(d) { return d.parent === root ? 1 : 0; })
.style("display", function(d) { return d.parent === root ? "inline" : "none"; })
.text(function(d) { return d.data.name; });
var node = g.selectAll("circle,text");
node.append("title")
.text(function(d){
return d.country})
svg
.style("background", color(-1))
.on("click", function() { zoom(root); });
zoomTo([root.x, root.y, root.r * 2 + margin]);
function zoom(d) {
var focus0 = focus; focus = d;
var transition = d3.transition()
.duration(d3.event.altKey ? 7500 : 750)
.tween("zoom", function(d) {
var i = d3.interpolateZoom(view, [focus.x, focus.y, focus.r * 2 + margin]);
return function(t) { zoomTo(i(t)); };
});
transition.selectAll("text")
.filter(function(d) { return d.parent === focus || this.style.display === "inline"; })
.style("fill-opacity", function(d) { return d.parent === focus ? 1 : 0; })
.on("start", function(d) { if (d.parent === focus) this.style.display = "inline"; })
.on("end", function(d) { if (d.parent !== focus) this.style.display = "none"; });
}
function zoomTo(v) {
var k = diameter / v[2]; view = v;
node.attr("transform", function(d) { return "translate(" + (d.x - v[0]) * k + "," + (d.y - v[1]) * k + ")"; });
circle.attr("r", function(d) { return d.r * k; });
}
}
来源：https://stackoverflow.com/questions/42341177/zoomable-circle-packing-color-change