问题描述
我是 D3 新手,我想通过例子学习,我修改了一个示例代码,但我无法做到这一点:在旭日图上只显示两个环,这是代码:
<!DOCTYPE html>
<Meta charset="utf-8">
<style>
path {
stroke: #fff;
fill-rule: evenodd;
}
text {
font-family: Arial,sans-serif;
font-size: 16px;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
// Static dimensions
var width = 960,height = 700,radius = Math.min(width,height) / 2;
// Dynamic dimensions
width = window.innerWidth;
height = window.innerHeight;
radius = Math.min(width,height) / 2;
const formatNumber = d3.format(',d');
var x = d3.scale.linear()
.range([0,2 * Math.PI]);
var y = d3.scale.pow()
.exponent(0.4)
.range([0,radius]);
var color = d3.scale.category20c();
var svg = d3.select("body").append("svg")
.attr("width",width)
.attr("height",height)
.append("g")
.attr("transform","translate(" + width / 2 + "," + (height / 2 + 10) + ")");
var partition = d3.layout.partition()
.value(function(d) { return d.size; });
var arc = d3.svg.arc()
.startAngle(function(d) { return Math.max(0,Math.min(2 * Math.PI,x(d.x))); })
.endAngle(function(d) { return Math.max(0,x(d.x + d.dx))); })
.innerRadius(function(d) { return Math.max(0,y(d.y)); })
.outerRadius(function(d) { return Math.max(0,y(d.y + d.dy)); });
d3.json("structure.json",function(error,root) {
var g = svg.selectAll("g")
.data(partition.nodes(root)
// .filter(function(d) {
// return (d.depth < 2);
// })
)
.enter().append("g");
var path = g.append("path")
.attr("d",arc)
.style("fill",function(d) { return color((d.children ? d : d.parent).name); })
.on("click",click)
var text = g.append("text")
.attr("transform",function(d) { return "rotate(" + computeTextRotation(d) + ")"; })
.attr("x",function(d) { return y(d.y); })
.attr("dx","6") // margin
.attr("dy",".35em") // vertical-align
.attr('display',function(d) {
const CHAR_SPACE = 10;
const deltaAngle = x(d.x1) - x(d.x0);
const r = Math.max(0,(y(d.y0) + y(d.y1)) / 2);
const perimeter = r * deltaAngle;
return d.name.length * CHAR_SPACE < perimeter;
}
)
.text(function(d) {
if (d.name.includes("chip")) {
label = '';
}
else {
label = d.name;
}
if (!isNaN(d.value)) {
label = '\n' + label + formatNumber(d.value);
}
return label;
//return d.name;
}
)
function click(d) {
// fade out all text elements
text.transition().attr("opacity",0);
path.transition()
.duration(750)
.attrTween("d",arcTween(d))
.each("end",function(e,i) {
// check if the animated element's data e lies within the visible angle span given in d
if (e.x >= d.x && e.x < (d.x + d.dx)) {
// get a selection of the associated text element
var arcText = d3.select(this.parentNode).select("text");
// fade in the text element and recalculate positions
arcText.transition().duration(750)
.attr("opacity",1)
.attr("transform",function() { return "rotate(" + computeTextRotation(e) + ")" })
.attr("x",function(d) { return y(d.y); });
}
});
}
});
d3.select(self.frameElement).style("height",height + "px");
// Interpolate the scales!
function arcTween(d) {
var xd = d3.interpolate(x.domain(),[d.x,d.x + d.dx]),yd = d3.interpolate(y.domain(),[d.y,1]),yr = d3.interpolate(y.range(),[d.y ? 20 : 0,radius]);
return function(d,i) {
return i
? function(t) { return arc(d); }
: function(t) { x.domain(xd(t)); y.domain(yd(t)).range(yr(t)); return arc(d); };
};
}
function computeTextRotation(d) {
return (x(d.x + d.dx / 2) - Math.PI / 2) / Math.PI * 180;
}
</script>
如您所见,我添加了一行带有 .filter
并且在加载 json 时有效,但是一旦单击一个环,它就不会动态显示下一个环。一个人怎么可能随时只展示两个“儿童戒指”?
解决方法
我能够解决问题的唯一方法是向 d3 元素添加类属性,并使用 jquery 禁用/启用环,它实际上是这样工作的,不确定是否有更直接的方法。