我使用D3.js创建了一个简单的饼图，我希望在这些元素的click事件中弹出饼图的每个元素/路径。
以下是我所说的饼图：jsfiddle.net/ankur881120/kt97oq57。
arcs.filter(function(d) { return d.endAngle - d.startAngle > .2; }).append("svg:text")
.attr("dy", ".35em")
.attr("text-anchor", "middle")
//.attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")rotate(" + angle(d) + ")"; })
.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.outerRadius = outerRadius; // Set Outer Coordinate
d.innerRadius = outerRadius/2; // Set Inner Coordinate
return "translate(" + arc.centroid(d) + ")rotate(" + angle(d) + ")";
现在我想点击红色元素时弹出红色元素。
寻找所有建议，以解决此问题。
答案 0 :(得分：3)
我刚刚回答了一个关于这个yesterday的非常相似的问题。你的用例是不同的，所以在我更好的判断下，我会再次回答它。
基本上，添加点击处理程序并将弧“组”（弧和文本标签）转换到一起：
var arcs = vis.selectAll("g.slice")
// Associate the generated pie data (an array of arcs, each having startAngle,
// endAngle and value properties)
.data(pie)
// 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
.enter()
// Create a group to hold each slice (we will have a <path> and a <text>
// element associated with each slice)
.append("svg:g")
.attr("class", "slice") //allow us to style things in the slices (like text)
// ADDED CLICK HANDLER
.on('click',function(d,i){
d3.select(this)
.transition()
.duration(500)
.attr("transform",function(d){
// this this group expanded out?
if (!d.data._expanded){
d.data._expanded = true;
var a = d.startAngle + (d.endAngle - d.startAngle)/2 - Math.PI/2;
var x = Math.cos(a) * 20;
var y = Math.sin(a) * 20;
// move it away from the circle center
return 'translate(' + x + ',' + y + ')';
} else {
d.data._expanded = false;
// move it back
return 'translate(0,0)';
}
});
});
更新了fiddle。
完整代码：
var canvasWidth = 300, //width
canvasHeight = 300, //height
outerRadius = 100, //radius
color = d3.scale.category20(); //builtin range of colors
var dataSet = [
{"legendLabel":"One", "magnitude":20},
{"legendLabel":"Two", "magnitude":40},
{"legendLabel":"Three", "magnitude":50},
{"legendLabel":"Four", "magnitude":16},
{"legendLabel":"Five", "magnitude":50},
{"legendLabel":"Six", "magnitude":8},
{"legendLabel":"Seven", "magnitude":30}];
var vis = d3.select("body")
.append("svg:svg") //create the SVG element inside the <body>
.data([dataSet]) //associate our data with the document
.attr("width", canvasWidth) //set the width of the canvas
.attr("height", canvasHeight) //set the height of the canvas
.append("svg:g") //make a group to hold our pie chart
.attr("transform", "translate(" + 1.5*outerRadius + "," + 1.5*outerRadius + ")") // relocate center of pie to 'outerRadius,outerRadius'
// This will create <path> elements for us using arc data...
var arc = d3.svg.arc()
.outerRadius(outerRadius);
var pie = d3.layout.pie() //this will create arc data for us given a list of values
.value(function(d) { return d.magnitude; }) // Binding each value to the pie
.sort( function(d) { return null; } );
// Select all <g> elements with class slice (there aren't any yet)
var arcs = vis.selectAll("g.slice")
// Associate the generated pie data (an array of arcs, each having startAngle,
// endAngle and value properties)
.data(pie)
// 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
.enter()
// Create a group to hold each slice (we will have a <path> and a <text>
// element associated with each slice)
.append("svg:g")
.attr("class", "slice") //allow us to style things in the slices (like text)
.on('click',function(d,i){
d3.select(this)
.transition()
.duration(500)
.attr("transform",function(d){
if (!d.data._expanded){
d.data._expanded = true;
var a = d.startAngle + (d.endAngle - d.startAngle)/2 - Math.PI/2;
var x = Math.cos(a) * 20;
var y = Math.sin(a) * 20;
return 'translate(' + x + ',' + y + ')';
} else {
d.data._expanded = false;
return 'translate(0,0)';
}
});
});
arcs.append("svg:path")
//set the color for each slice to be chosen from the color function defined above
.attr("fill", function(d, i) { return color(i); } )
//this creates the actual SVG path using the associated data (pie) with the arc drawing function
.attr("d", arc);
// Add a legendLabel to each arc slice...
arcs.append("svg:text")
.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.outerRadius = outerRadius + 50; // Set Outer Coordinate
d.innerRadius = outerRadius + 45; // Set Inner Coordinate
return "translate(" + arc.centroid(d) + ")";
})
.attr("text-anchor", "middle") //center the text on it's origin
.style("fill", "Purple")
.style("font", "bold 12px Arial")
.text(function(d, i) { return dataSet[i].legendLabel; }); //get the label from our original data array
// Add a magnitude value to the larger arcs, translated to the arc centroid and rotated.
arcs.filter(function(d) { return d.endAngle - d.startAngle > .2; }).append("svg:text")
.attr("dy", ".35em")
.attr("text-anchor", "middle")
//.attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")rotate(" + angle(d) + ")"; })
.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.outerRadius = outerRadius; // Set Outer Coordinate
d.innerRadius = outerRadius/2; // Set Inner Coordinate
return "translate(" + arc.centroid(d) + ")rotate(" + angle(d) + ")";
})
.style("fill", "White")
.style("font", "bold 12px Arial")
.text(function(d) { return d.data.magnitude; });
// Computes the angle of an arc, converting from radians to degrees.
function angle(d) {
var a = (d.startAngle + d.endAngle) * 90 / Math.PI - 90;
return a > 90 ? a - 180 : a;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>