我正在尝试创建一个交互式饼图。当切片悬停时,它应该附加一个对象并将其显示在切片的正上方。问题在于获取矩形的 XY 坐标。
此外,我正在使用这两种方法来创建悬停对象。一种是在创建饼图时嵌入现有对象,并在悬停时打开和关闭它。另一种是在创建鼠标悬停事件时附加对象,并在每次鼠标移出时删除它。
var w = 600, //width
h = 500, //height
color = d3.scale.category20c(); //builtin range of colors
var outerRadius = w / 3.2;
var innerRadius = w / 6;
data = [{"label":"Nasik", "value":20},
{"label":"Delhi", "value":20},
{"label":"Mumbai", "value":20},
{"label":"Denver", "value":20},
{"label":"Denver", "value":20},
{"label":"Denver", "value":20},
{"label":"Denver", "value":20},
{"label":"Denver", "value":20},
{"label":"Washington", "value":20},
{"label":"Chicago", "value":20}];
var vis = d3.select("body")
.append("svg:svg") //create the SVG element inside the <body>
.data([data]) //associate our data with the document
.attr("width", w)
.attr("height", h)
.append("svg:g") //make a group to hold our pie chart
.attr("transform", "translate(" + outerRadius + "," + outerRadius + ")")
var arc = d3.svg.arc()
.innerRadius(innerRadius)
.outerRadius(outerRadius);
var pie = d3.layout.pie() //this will create arc data for us given a list of values
.value(function(d) { return d.value; }); //we must tell it out to access the value of each element in our data array
var arcs = vis.selectAll("g.slice") //this selects all <g> elements with class slice (there aren't any yet)
.data(pie) //associate the generated pie data (an array of arcs, each having startAngle, endAngle and value properties)
.enter() //this will create <g> elements for every "extra" data element that should be associated with a selection. The result is creating a <g> for every object in the data array
.append("svg:g") //create a group to hold each slice (we will have a <path> and a <text> element associated with each slice)
.attr("class", "slice"); //allow us to style things in the slices (like text)
arcs.append("svg:path")
.attr("class", 'rohan')
.attr("fill", function(d, i) {
// return color(i);
return 'white';
} ) //set the color for each slice to be chosen from the color function defined above
.attr("d", arc); //this creates the actual SVG path using the associated data (pie) with the arc drawing function
d3.selectAll("g.slice").selectAll("path").attr("stroke-dasharray","5,5")
;
d3.selectAll("g.slice path")
.on("mouseover", function() {
console.log('iam here');
//alert('hello this is rohan');
d3.select('.dot').style("stroke","steelblue").attr("x", cx -ch).attr("y", cy - ch).attr("height", ch * 2).attr("width", ch * 2);
})
.on("mouseout", function() {
console.log('iam here');
//alert('this is over');
})
;
d3.selectAll("svg").append("rect").attr("class", 'dot').attr("x", 150).attr("y", 200).attr("height", 100).attr("width", 200).style("fill", 'black');
arcs.append("svg:text") //add a label to each slice
.attr("transform", function(d) { //set the label's origin to the center of the arc
//we have to make sure to set these before calling arc.centroid
d.innerRadius = innerRadius;
d.outerRadius = outerRadius;
return "translate(" + arc.centroid(d) + ")"; //this gives us a pair of coordinates like [50, 50]
})
.attr("text-anchor", "middle") //center the text on it's origin
.text(function(d, i) { return data[i].label; });
我在这里包含了一个小提琴, http://jsfiddle.net/rohdz/27zCz/
先感谢您!