Javascript 如何将图例添加到饼图D3.js?
我已经研究过类似的问题,但仍然不能正确地实现代码Javascript 如何将图例添加到饼图D3.js?,javascript,d3.js,Javascript,D3.js,我已经研究过类似的问题,但仍然不能正确地实现代码 var width = 960, height = 500, radius = Math.min(width, height) / 2; var color = d3.scale.ordinal() .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]); var percentageFormat = d3.format("%")
var width = 960,
height = 500,
radius = Math.min(width, height) / 2;
var color = d3.scale.ordinal()
.range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);
var percentageFormat = d3.format("%");
var arc = d3.svg.arc()
.outerRadius(radius - 10)
.innerRadius(0);
var pie = d3.layout.pie()
.sort(null)
.value(function(d) {
return d.values;
});
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
d3.json("staff.json", function(error, json_data) {
var data = d3.nest()
.key(function(d) {
return d.Position;
})
.rollup(function(d) {
return d.length;
}).entries(json_data);
data.forEach(function(d) {
d.percentage = d.values / json_data.length;
});
console.log("data variable", data);
console.log("pie(data)", pie(data));
var g = svg.selectAll(".arc")
.data(pie(data))
.enter().append("g")
.attr("class", "arc")
.on('mouseover', function() {
var current = this;
var others = svg.selectAll(".arc").filter(function(el) {
return this != current
});
others.selectAll("path").style('opacity', 0.8);
})
.on('mouseout', function() {
var current = this;
d3.select(this)
.style('opacity', 1);
var others = svg.selectAll(".arc").filter(function(el) {
return this != current
});
others.selectAll("path").style('opacity', 1);
});
g.append("path")
.attr("d", arc)
.style("fill", function(d, i) {
return color(i);
});
g.append("text")
.attr("transform", function(d) {
return "translate(" + arc.centroid(d) + ")";
})
.attr("dy", ".35em")
.style("text-anchor", "middle")
.text(function(d) {
console.log("d is", d);
return percentageFormat(d.data.percentage);
});
下面是一个JSON文件:
[{
"Position" : "Programmer",
"Name" : "Giacomo Gulizzoni",
"Age" : 37,
"Sex" : "Male",
"Project" : "SmartFactory"
}, {
"Position" : "Tester",
"Name" : "Marko Botton",
"Age" : 34,
"Sex" : "Male",
"Project" : "SmartFactory"
}, {
"Position" : "Tester",
"Name" : "Mariah Maclachian",
"Age" : 37,
"Sex" : "Female",
"Project" : "SmartFactory"
}, {
"Position" : "Tester",
"Name" : "Valerie Liberty",
"Age" : 25,
"Sex" : "Female",
"Project" : "SmartProject"
}, {
"Position" : "Programmer",
"Name " : "Guido Jack Gulizzoni",
"Age" : 22,
"Sex" : "Male",
"Project" : "SmartProject"
}]
事实上,如果我没弄错的话,图例只是绑定到数据的矩形。但在我的例子中,JSON文件中的项不是数值。请查看我的实验结果。在您的代码中:
图例选择中的数据设置错误
var legend = ...
.data(pie(data))//this is wrong
.enter().append("g")
你需要这样做
var legend = d3.select("body").append("svg")
.attr("class", "legend")
.selectAll("g")
.data(data)//setting the data as we know there are only two set of data[programmar/tester] as per the nest function you have written
.enter().append("g")
.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
legend.append("rect")
.attr("width", 18)
.attr("height", 18)
.style("fill", function(d, i) {
return color(d.key);
});
legend.append("text")
.attr("x", 24)
.attr("y", 9)
.attr("dy", ".35em")
.text(function(d) { return d.key; });
工作代码
希望这有帮助 实际上,它在你的代码中
var legend = svg.selectAll('.legend') // NEW
.data(pie(data)) // NEW
.enter() // NEW
.append('g') // NEW
.attr('class', 'legend') // NEW
.attr('transform', function(d, i) { // NEW
var height = legendRectSize + legendSpacing; // NEW
var offset = height * pie(data).length / 2; // NEW
var horz = -2 * legendRectSize; // NEW
var vert = i * height - offset; // NEW
return 'translate(' + horz + ',' + vert + ')'; // NEW
});
legend.append('rect') // NEW
.attr('width', legendRectSize) // NEW
.attr('height', legendRectSize) // NEW
.style('fill', function(d,i){return color(i);}) // NEW
.style('stroke', function(d,i){return color(i);}); // NEW
legend.append('text') // NEW
.attr('x', legendRectSize + legendSpacing) // NEW
.attr('y', legendRectSize - legendSpacing) // NEW
.text(function(d) { console.log("text: ");console.log(d);return d.data.key; });
我没有发表评论,也没有做什么改变。
你可以观察代码。我的建议是:你是在寻找工具提示还是图例,如果你是在寻找图例,你想展示什么,或者如果你是在寻找工具提示,你想展示什么。Saikiran,我想要这样的东西:一个图例是给程序员的,另一个是给测试人员的。换句话说,用户应该看到60%和40%的含义。您可以修改
文本(函数(d){console.log(“d is”,d);返回percentageFormat(d.data.percentage);})
转换为.text(函数(d){console.log(“d是”,d);返回d.data.key+“-”+percentageFormat(d.data.percentage);})代码>试试。这不是我想要的)。我需要这个:但现在我有了这个:西里尔,太棒了,谢谢!我对这个d3有点困惑)要研究你的决定!非常感谢你!