我只是想附加 mbostocks 饼图示例的标签,但由于某种原因我无法让它工作。
我本质上只是想结合他的两个示例( pie update 、 pie labels ),所以我尝试实现此代码;
var g = svg.selectAll(".arc")
.data(pie(data))
.enter().append("g")
.attr("class", "arc");
g.append("path")
.attr("d", arc)
.style("fill", function(d) { return color(d.data.apples); });
g.append("text")
.attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
.attr("dy", ".35em")
.text(function(d) { return d.data.apples; });
});
在饼图更新示例中输入此变量;
var path = svg.datum(data).selectAll("path")
.data(pie)
.enter().append("path")
.attr("fill", function(d, i) { return color(i); })
.attr("d", arc)
.each(function(d) { this._current = d; }); // store the initial angles
这是我尝试的 plnk,希望有人可以解决我遇到的问题。
http://plnkr.co/edit/e05kKjB8KWGqRteh8OdS?p=preview
<小时/>我的尝试代码;
var width = 960,
height = 500,
radius = Math.min(width, height) / 2;
var color = d3.scale.category20();
var pie = d3.layout.pie()
.value(function(d) { return d.apples; })
.sort(null);
var arc = d3.svg.arc()
.innerRadius(radius - 100)
.outerRadius(radius - 20);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
d3.tsv("data.tsv", type, function(error, data) {
if (error) throw error;
/* var path = svg.datum(data).selectAll("path")
.data(pie)
.enter().append("path")
.attr("fill", function(d, i) { return color(i); })
.attr("d", arc)
.each(function(d) { this._current = d; }); // store the initial angles*/
var g = svg.datum(data).selectAll(".arc")
.data(pie)
.enter().append("g")
.attr("class", "arc")
g.append("path")
.attr("d", arc)
.style("fill", function(d) { return color(d.data.apples); })
.each(function(d) { this._current = d; }); // store the initial angles
g.append("text")
.attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
.attr("dy", ".35em")
.text(function(d) { return d.data.apples; });
d3.selectAll("input")
.on("change", change);
var timeout = setTimeout(function() {
d3.select("input[value=\"oranges\"]").property("checked", true).each(change);
});
function change() {
var value = this.value;
clearTimeout(timeout);
pie.value(function(d) { return d[value]; }); // change the value function
path = g.data(pie); // compute the new angles
path.transition().duration(750).attrTween("d", arcTween); // redraw the arcs
}
});
function type(d) {
d.apples = +d.apples;
d.oranges = +d.oranges;
return d;
}
// Store the displayed angles in _current.
// Then, interpolate from _current to the new angles.
// During the transition, _current is updated in-place by d3.interpolate.
function arcTween(a) {
var i = d3.interpolate(this._current, a);
this._current = i(0);
return function(t) {
return arc(i(t));
};
}
最佳答案
当您从 path
集合移动到包含 path
和 text
的 g
集合时,您没有更新您的过渡以在路径上进行操作。它正在尝试在 g
上应用转换。更正后的代码:
function change() {
var value = this.value;
pie.value(function(d) { return d[value]; });
g = g.data(pie);
g.select("path") //<-- operate on the paths in the g
.transition()
.duration(750)
.attrTween("d", arcTween);
}
运行代码:
var width = 500,
height = 500,
radius = Math.min(width, height) / 2;
var color = d3.scale.category20();
var pie = d3.layout.pie()
.value(function(d) {
return d.apples;
})
.sort(null);
var arc = d3.svg.arc()
.innerRadius(radius - 100)
.outerRadius(radius - 20);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var data = [{
"apples": 53245,
"oranges": 200
}, {
"apples": 28479,
"oranges": 200
}, {
"apples": 19697,
"oranges": 200
}, {
"apples": 24037,
"oranges": 200
}, {
"apples": 40245,
"oranges": 200
}];
var g = svg.datum(data).selectAll(".arc")
.data(pie)
.enter().append("g")
.attr("class", "arc");
var path = g.append("path")
.attr("d", arc)
.style("fill", function(d) {
return color(d.data.apples);
})
.each(function(d) {
this._current = d;
}); // store the initial angles
var text = g.append("text")
.attr("transform", function(d) {
return "translate(" + arc.centroid(d) + ")";
})
.attr("dy", ".35em")
.text(function(d) {
return d.data.apples;
});
d3.selectAll("input")
.on("change", change);
function change() {
var value = this.value;
pie.value(function(d) {
return d[value];
}); // change the value function
g = g.data(pie); // compute the new angles
g.select("path")
.transition()
.duration(750)
.attrTween("d", arcTween); // redraw the arcs
g.select("text")
.style("opacity", 0)
.attr("transform", function(d) {
return "translate(" + arc.centroid(d) + ")";
})
.text(function(d) {
return d.data[value];
})
.transition()
.duration(1000)
.style("opacity", 1);
}
function type(d) {
d.apples = +d.apples;
d.oranges = +d.oranges;
return d;
}
// Store the displayed angles in _current.
// Then, interpolate from _current to the new angles.
// During the transition, _current is updated in-place by d3.interpolate.
function arcTween(a) {
var i = d3.interpolate(this._current, a);
this._current = i(0);
return function(t) {
return arc(i(t));
};
}
<!DOCTYPE html>
<html>
<head>
<script data-require="jquery@*" data-semver="2.2.0" src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<script data-require="d3@*" data-semver="3.5.3" src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script>
<link rel="stylesheet" href="style.css" />
</head>
<body>
<form>
<label><input type="radio" name="dataset" value="apples" checked> Apples</label>
<label><input type="radio" name="dataset" value="oranges"> Oranges</label>
</form>
<script src="script.js"></script>
</body>
</html>
关于javascript - 使用标签更新饼图 (d3),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37595515/