我创建了一个饼图，它显示得很好。
只是，我注意到一些文本被饼图切片隐藏了。通过仔细观察，我注意到每个文本都可以与下一个切片一起绘制。
所以渲染顺序是这样的:切片 1、文本 1、切片 2、文本 2、切片 3、文本 3 等...
如何才能使渲染顺序为切片 1、切片 2、切片 3...切片 n。 然后文本 1、文本 2、文本 3...文本 n
然后文本将始终显示，因为它将绘制在饼图的每个切片的顶部。
谢谢，这是我的代码
function createChart(dom, newData, title) {
d3.select(dom).selectAll("*").remove();
// Define size & radius of donut pie chart
var width = 450,
height = 800,
radius = Math.min(width, height) / 2;
// Define arc colours
var colour = d3.scale.category20();
// Define arc ranges
var arcText = d3.scale.ordinal()
.rangeRoundBands([0, width], .1, .3);
// Determine size of arcs
var arc = d3.svg.arc()
.innerRadius(radius - 130)
.outerRadius(radius - 10);
// Create the donut pie chart layout
var pie = d3.layout.pie()
.value(function (d) { return d.count; })
.sort(null);
// Append SVG attributes and append g to the SVG
var mySvg = d3.select(dom).append("svg")
.attr("width", width)
.attr("height", height);
var svg = mySvg
.append("g")
.attr("transform", "translate(" + radius + "," + radius + ")");
var svgText = mySvg
.append("g")
.attr("transform", "translate(" + radius + "," + radius + ")");
// Define inner circle
svg.append("circle")
.attr("cx", 0)
.attr("cy", 0)
.attr("r", 100)
.attr("fill", "#fff") ;
// Calculate SVG paths and fill in the colours
var g = svg.selectAll(".arc")
.data(pie(newData))
.enter().append("g")
.attr("class", "arc");
// Append the path to each g
g.append("path")
.attr("d", arc)
//.attr("data-legend", function(d, i){ return parseInt(newData[i].count) + ' ' + newData[i].emote; })
.attr("fill", function(d, i) {
return colour(i);
});
// Append text labels to each arc
g.append("text")
.attr("transform", function(d) {
return "translate(" + arc.centroid(d) + ")";
})
.attr("dy", ".35em")
.style("text-anchor", "middle")
.attr("fill", "#fff")
.text(function(d,i) { return newData[i].count > 0 ? newData[i].emote : ''; })
// Append text to the inner circle
svg.append("text")
.style("text-anchor", "middle")
.attr("fill", "#36454f")
.text(function(d) { return title; })
.style("font-size","16px")
.style("font-weight", "bold");
}
最佳答案
最简单的方法是为 text 标签提供自己的 g 并重新绑定(bind)数据:
// there own g
var textG = svg.selectAll(".labels")
.data(pie(newData))
.enter().append("g")
.attr("class", "labels");
// Append text labels to each arc
textG.append("text")
.attr("transform", function(d) {
return "translate(" + arc.centroid(d) + ")";
})
.attr("dy", ".35em")
.style("text-anchor", "middle")
.attr("fill", "#fff")
.text(function(d, i) {
return d.data.count > 0 ? d.data.emote : ''; // you can use d.data instead of indexing
});
完整示例:
<!DOCTYPE html>
<html>
<head>
<script data-require="d3@3.5.3" data-semver="3.5.3" src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script>
</head>
<body>
<script>
var newData = [{
count: 1,
emote: "OneTwoThree"
}, {
count: 1,
emote: "FourFiveSix"
}, {
count: 1,
emote: "SevenEightNine"
}, {
count: 15,
emote: "TenElevenTwelve"
},
]
// Define size & radius of donut pie chart
var width = 450,
height = 800,
radius = Math.min(width, height) / 2;
// Define arc colours
var colour = d3.scale.category20();
// Define arc ranges
var arcText = d3.scale.ordinal()
.rangeRoundBands([0, width], .1, .3);
// Determine size of arcs
var arc = d3.svg.arc()
.innerRadius(radius - 130)
.outerRadius(radius - 10);
// Create the donut pie chart layout
var pie = d3.layout.pie()
.value(function(d) {
return d.count;
})
.sort(null);
// Append SVG attributes and append g to the SVG
var mySvg = d3.select('body').append("svg")
.attr("width", width)
.attr("height", height);
var svg = mySvg
.append("g")
.attr("transform", "translate(" + radius + "," + radius + ")");
var svgText = mySvg
.append("g")
.attr("transform", "translate(" + radius + "," + radius + ")");
// Define inner circle
svg.append("circle")
.attr("cx", 0)
.attr("cy", 0)
.attr("r", 100)
.attr("fill", "#fff");
// Calculate SVG paths and fill in the colours
var g = svg.selectAll(".arc")
.data(pie(newData))
.enter().append("g")
.attr("class", "arc");
// Append the path to each g
g.append("path")
.attr("d", arc)
//.attr("data-legend", function(d, i){ return parseInt(newData[i].count) + ' ' + newData[i].emote; })
.attr("fill", function(d, i) {
return colour(i);
});
var textG = svg.selectAll(".labels")
.data(pie(newData))
.enter().append("g")
.attr("class", "labels");
// Append text labels to each arc
textG.append("text")
.attr("transform", function(d) {
return "translate(" + arc.centroid(d) + ")";
})
.attr("dy", ".35em")
.style("text-anchor", "middle")
.attr("fill", "#fff")
.text(function(d, i) {
return d.data.count > 0 ? d.data.emote : '';
});
</script>
</body>
</html>关于javascript - 如何在饼图上正确绘制文本？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32293513/