我一直在尝试学习D3 (特别是气泡图)。我已经创建了一个非常简单的图表:
//This is making the demensions for the circles and canvas
//The format and color is for hovering over the circles for the dialog box
var diameter = 1500,
format = d3.format(",d"),
color = d3.scale.category20c();
//This makes the canvas that the bubble chart will be made on
var canvas = d3.select("body").append("svg")
.attr("width", diameter)
.attr("height", diameter)
.append("g")
.attr("transform", "translate(50,50)");
//This is the size of the actual bubbles in the chart
var pack = d3.layout.pack()
.size([900, 900])
.padding(85);
//This is adding the data into the bubbles and creating their size
d3.json("CountryData.js", function (data) {
var nodes = pack.nodes(data);
var node = canvas.selectAll(".node")
.data(nodes)
.enter()
.append("g")
.attr("class", "node")
.attr("transform", function (d) { return "translate(" + d.x + "," + d.y + ")"; });
//This is the actual bubbles
node.append("circle")
.attr("r", function (d) {return d.r;})
.style("fill", function (d, i) { return color(i); });
//This is the text inside the bubbles
node.append("text")
.text(function (d) { return d.children ? "" : d.name; })
.style("text-anchor", "middle")
//This is the dialog box
node.append("title")
.text(function (d) { return d.name + ": " + format(d.value) + "" + "medals"; });
});
我一直在尝试添加一个图例来显示"亚洲"，"北美洲"，"中东"等及其对应的颜色。我最接近的尝试是显示带有颜色和名称的方框。我试图使用这个链接作为参考：D3圆形包图中的图例。我可以附上我尝试创建图例的代码，但我觉得这会让帖子变得太长。以下是我的数据：
{
"name" : "Region Olympic Medals",
"value" : 10000,
"children" : [
{
"name" : "Asia",
"value" : 451,
"children" : [
{"name" : "Summer Gold", "value" : 114},
{"name" : "Summer Silver", "value" : 172},
{"name" : "Summer Bronze", "value" : 158},
{"name" : "Winter Gold", "value" : 1},
{"name" : "Winter Silver", "value" : 1},
{"name" : "Winter Bronze", "value" : 2}
]
},
{
"name" : "Australia & Oceaina",
"value" : 26,
"children" : [
{"name" : "Summer Gold", "value" : 4},
{"name" : "Summer Silver", "value" : 7},
{"name" : "Summer Bronze", "value" : 15},
{"name" : "Winter Gold", "value" : 0},
{"name" : "Winter Silver", "value" : 0},
{"name" : "Winter Bronze", "value" : 0}
]
},
{
"name" : "Caribbean",
"value" : 1136,
"children" : [
{"name" : "Summer Gold", "value" : 306},
{"name" : "Summer Silver", "value" : 319},
{"name" : "Summer Bronze", "value" : 381},
{"name" : "Winter Gold", "value" : 42},
{"name" : "Winter Silver", "value" : 41},
{"name" : "Winter Bronze", "value" : 47}
]
},
{
"name" : "Central America",
"value" : 26,
"children" : [
{"name" : "Summer Gold", "value" : 4},
{"name" : "Summer Silver", "value" : 3},
{"name" : "Summer Bronze", "value" : 4},
{"name" : "Winter Gold", "value" : 0},
{"name" : "Winter Silver", "value" : 0},
{"name" : "Winter Bronze", "value" : 0}
]
},
{
"name" : "Europe",
"value" : 7264,
"children" : [
{"name" : "Summer Gold", "value" : 1924},
{"name" : "Summer Silver", "value" : 1993},
{"name" : "Summer Bronze", "value" : 2257},
{"name" : "Winter Gold", "value" : 362},
{"name" : "Winter Silver", "value" : 366},
{"name" : "Winter Bronze", "value" : 362}
]
},
{
"name" : "Middle East",
"value" : 2696,
"children" : [
{"name" : "Summer Gold", "value" : 280},
{"name" : "Summer Silver", "value" : 331},
{"name" : "Summer Bronze", "value" : 361},
{"name" : "Winter Gold", "value" : 535},
{"name" : "Winter Silver", "value" : 582},
{"name" : "Winter Bronze", "value" : 607}
]
},
{
"name" : "North America",
"value" : 7,
"children" : [
{"name" : "Summer Gold", "value" : 4},
{"name" : "Summer Silver", "value" : 1},
{"name" : "Summer Bronze", "value" : 2},
{"name" : "Winter Gold", "value" : 0},
{"name" : "Winter Silver", "value" : 0},
{"name" : "Winter Bronze", "value" : 0}
]
},
{
"name" : "South America",
"value" : 6273,
"children" : [
{"name" : "Summer Gold", "value" : 1220},
{"name" : "Summer Silver", "value" : 1014},
{"name" : "Summer Bronze", "value" : 335},
{"name" : "Winter Gold", "value" : 1421},
{"name" : "Winter Silver", "value" : 1193},
{"name" : "Winter Bronze", "value" : 1090}
]
},
{
"name" : "Sub-Saharan Africa",
"value" : 1847,
"children" : [
{"name" : "Summer Gold", "value" : 485},
{"name" : "Summer Silver", "value" : 549},
{"name" : "Summer Bronze", "value" : 628},
{"name" : "Winter Gold", "value" : 50},
{"name" : "Winter Silver", "value" : 59},
{"name" : "Winter Bronze", "value" : 76}
]
}
]
}