D3 饼图初始渲染问题

Question

着眼于实现 d3 饼图，饼图的初始绘制未正确呈现。然而，一旦我调用重绘（随机化左上角），它就会按预期放置到位，然后未来的会按预期过渡。

我是不是第一次初始化图表的时候哪里做错了？

<!DOCTYPE html>
<meta charset="utf-8">
<style> 

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  width: 960px;
  height: 500px;
  position: relative;
}

svg {
    width: 100%;
    height: 100%;
}

path.slice{
    stroke-width:2px;
}

polyline{
    opacity: .3;
    stroke: black;
    stroke-width: 2px;
    fill: none;
}

</style>
<body>
<button class="randomize">randomize</button>

    <script src="//cdnjs.cloudflare.com/ajax/libs/d3/5.9.2/d3.min.js" data-semver="5.9.2" data-require="d3@*"></script>
<script>
  
 var arc, outerArc, width, height, radius;
  
 var pie = d3.pie()
    .sort(null)
    .value(function(d) {
        return d.value;
    });
  
  var key = function(d){ return d.data.label; };

  var color = d3.scaleOrdinal()
    .domain(["Lorem ipsum", "dolor sit", "amet"])
    .range(["#98abc5", "#6b486b", "#d0743c", "#ff8c00"]);


function randomData (){
    var labels = ["Lorem ipsum", "dolor sit", "amet"];
    return labels.map(function(label){
        return { label: label, value: Math.random() }
    });
}

initialRender(randomData());  
  
redraw(randomData());
 
d3.select(".randomize")
    .on("click", function(){
        redraw(randomData()); 
    });
 
 
function initialRender(data){
  var svg = d3.select("body")
    .append("svg")
    .append("g") 
  
svg.append("g")
    .attr("class", "slices");
svg.append("g")
    .attr("class", "labels");
svg.append("g") 
    .attr("class", "lines");

 
width = 960;
    height = 450;
    radius = Math.min(width, height) / 2;
 
var pie = d3.pie()
    .sort(null)
    .value(function(d) {
        return d.value;
    });

arc = d3.arc()
    .outerRadius(radius * 0.8)
    .innerRadius(radius * 0.4);

outerArc = d3.arc()
    .innerRadius(radius * 0.9)
    .outerRadius(radius * 0.9);

  svg.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

}
function redraw(data) { 

  var pieData = pie(data);
  
  var svg = d3.select("body")
  
  
    var text = svg.select(".labels").selectAll("text")
        .data(pieData, key); 

    text.enter()
        .append("text")
        .attr("dy", ".35em")
        .text(function(d) {
            return d.data.label;
        });
    
    function midAngle(d){ 
        return d.startAngle + (d.endAngle - d.startAngle)/2;
    }

    text.transition().duration(1000)
        .attrTween("transform", function(d) {
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) {
                var d2 = interpolate(t);
                var pos = outerArc.centroid(d2);
                pos[0] = radius * (midAngle(d2) < Math.PI ? 1 : -1);
                return "translate("+ pos +")";
            };
        })
        .styleTween("text-anchor", function(d){
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) {
                var d2 = interpolate(t);
                return midAngle(d2) < Math.PI ? "start":"end";
            };
        });

    text.exit()
        .remove();

    /* ------- SLICE TO TEXT POLYLINES -------*/

    var polyline = svg.select(".lines").selectAll("polyline")
        .data(pieData, key);
    
    polyline.enter()
        .append("polyline");

    polyline.transition().duration(1000)
        .attrTween("points", function(d){
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) {
                var d2 = interpolate(t);
                var pos = outerArc.centroid(d2);
                pos[0] = radius * 0.95 * (midAngle(d2) < Math.PI ? 1 : -1);
                return [arc.centroid(d2), outerArc.centroid(d2), pos];
            };          
        }); 
    
    polyline.exit()
        .remove();
  
    /* ------- PIE SLICES -------*/
  
    var slice = svg.select(".slices").selectAll("path.slice")
        .data(pieData, key);

    slice.enter()
        .insert("path")
        .style("fill", function(d) { return color(d.data.label); })
        .attr("class", "slice");
 
    slice       
        .transition().duration(1000)
        .attrTween("d", function(d) {
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) { 
                return arc(interpolate(t));
            };
        })

    slice.exit()
        .remove();

    /* ------- TEXT LABELS -------*/

};

</script>
</body>

Answer 1

你们很亲近。您的问题在这里：

text.transition().duration(1000)

折线和切片过渡也是如此。在第一个渲染中，在变量 text 中选择的 dom 上没有实际文本。您随后追加文本，但追加不会改变您的原始选择变量。您需要在输入后重新选择每个，追加。选择 enter append 稍后不起作用，因为以后的 enter append 选择将为空（您永远不会添加任何新切片等）

 var arc, outerArc, width, height, radius;
  
 var pie = d3.pie()
    .sort(null)
    .value(function(d) {
        return d.value;
    });
  
  var key = function(d){ return d.data.label; };

  var color = d3.scaleOrdinal()
    .domain(["Lorem ipsum", "dolor sit", "amet"])
    .range(["#98abc5", "#6b486b", "#d0743c", "#ff8c00"]);


function randomData (){
    var labels = ["Lorem ipsum", "dolor sit", "amet"];
    return labels.map(function(label){
        return { label: label, value: Math.random() }
    });
}

initialRender(randomData());  
  
redraw(randomData());
 
d3.select(".randomize")
    .on("click", function(){
        redraw(randomData()); 
    });
 
 
function initialRender(data){
  var svg = d3.select("body")
    .append("svg")
    .append("g") 
  
svg.append("g")
    .attr("class", "slices");
svg.append("g")
    .attr("class", "labels");
svg.append("g") 
    .attr("class", "lines");

 
width = 960;
    height = 450;
    radius = Math.min(width, height) / 2;
 
var pie = d3.pie()
    .sort(null)
    .value(function(d) {
        return d.value;
    });

arc = d3.arc()
    .outerRadius(radius * 0.8)
    .innerRadius(radius * 0.4);

outerArc = d3.arc()
    .innerRadius(radius * 0.9)
    .outerRadius(radius * 0.9);

  svg.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

}
function redraw(data) { 

  var pieData = pie(data);
  
  var svg = d3.select("body")
  
  
    var text = svg.select(".labels").selectAll("text")
        .data(pieData, key); 

    text.enter()
        .append("text")
        .attr("dy", ".35em")
        .text(function(d) {
            return d.data.label;
        });
    
  var textPath= svg.selectAll('text')
  
    function midAngle(d){ 
        return d.startAngle + (d.endAngle - d.startAngle)/2;
    }

    textPath.transition().duration(1000)
        .attrTween("transform", function(d) {
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) {
                var d2 = interpolate(t);
                var pos = outerArc.centroid(d2);
                pos[0] = radius * (midAngle(d2) < Math.PI ? 1 : -1);
                return "translate("+ pos +")";
            };
        })
        .styleTween("text-anchor", function(d){
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) {
                var d2 = interpolate(t);
                return midAngle(d2) < Math.PI ? "start":"end";
            };
        });

    text.exit()
        .remove();

    /* ------- SLICE TO TEXT POLYLINES -------*/

    var polyline = svg.select(".lines").selectAll("polyline")
        .data(pieData, key);
    
    polyline.enter()
        .append("polyline");
  
  var polyPath= svg.selectAll('polyline')
  
    polyPath.transition().duration(1000)
        .attrTween("points", function(d){
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) {
                var d2 = interpolate(t);
                var pos = outerArc.centroid(d2);
                pos[0] = radius * 0.95 * (midAngle(d2) < Math.PI ? 1 : -1);
                return [arc.centroid(d2), outerArc.centroid(d2), pos];
            };          
        }); 
    
    polyPath.exit()
        .remove();
  
    /* ------- PIE SLICES -------*/
  
    var slice = svg.select(".slices").selectAll("path.slice")
        .data(pieData, key);

    slice.enter()
        .insert("path")
        .style("fill", function(d) { return color(d.data.label); })
        .attr("class", "slice");
  
  
  var slicePath = svg.selectAll('.slice')
  
 
    slicePath       
        .transition().duration(1000)
        .attrTween("d", function(d) {
            this._current = this._current || d;
            var interpolate = d3.interpolate(this._current, d);
            this._current = interpolate(0);
            return function(t) { 
                return arc(interpolate(t));
            };
        })

    slice.exit()
        .remove();

D3 饼图初始渲染问题

D3 Pie chart initial render issue

javascript

d3.js