javascript - 制作 D3 Pie v4 示例 - 在初始渲染时设置动画

标签 javascript animation d3.js

我的工作起点是:http://bl.ocks.org/dbuezas/9306799 我无法弄清楚的一件事是为什么它一开始没有动画。我可以做一个简单的改变来使这个动画最初吗？

通常我将属性设置为零，但我不知道如何让 attrTween 开始动画。

有什么建议吗？

如果方便的话添加为一个片段..

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");

var width = 500,
    height = 200,
	radius = Math.min(width, height) / 2;

var pie = d3.layout.pie()
	.sort(null)
	.value(function(d) {
		return d.value;
	});

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

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

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

var key = function(d){ return d.data.label; };

var color = d3.scale.ordinal()
	.domain(["Lorem ipsum", "dolor sit", "amet", "consectetur", "adipisicing", "elit", "sed", "do", "eiusmod", "tempor", "incididunt"])
	.range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);

function randomData (){
	var labels = color.domain();
	return labels.map(function(label){
		return { label: label, value: Math.random() }
	});
}

change(randomData());

d3.select(".randomize")
	.on("click", function(){
		change(randomData());
	});


function change(data) {

	/* ------- PIE SLICES -------*/
	var slice = svg.select(".slices").selectAll("path.slice")
		.data(pie(data), 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 -------*/

	var text = svg.select(".labels").selectAll("text")
		.data(pie(data), 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(pie(data), 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();
};
body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  width: 400px;
  height: 400px;
  position: relative;
}

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

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

polyline{
	opacity: .3;
	stroke: black;
	stroke-width: 2px;
	fill: none;
}
<!DOCTYPE html>
<meta charset="utf-8">

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

<script src="http://d3js.org/d3.v3.min.js"></script>

</body>

最佳答案

问题是您需要为楔形设置与其最终状态不同的初始状态，以便查看过渡。

在图表的初始加载时，检查是否定义了 this._current，如果没有，则为其分配一些初始数据:

  if(!this._current) this._current = startSlice; // assign initial data
  else this._current = this._current || d;       // otherwise, continue as before.

startSlice 可能看起来像:

var startSlice = {
 startAngle: 0,
 endAngle: 0,
 padAngle:0,
 value:0,
 data: {lable:"",value:0}
}

或者您需要它来满足您的需要。我只更新了下面动画中的楔形部分:

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");

var width = 500,
    height = 200,
	radius = Math.min(width, height) / 2;

var pie = d3.layout.pie()
	.sort(null)
	.value(function(d) {
		return d.value;
	});

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

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

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

var key = function(d){ return d.data.label; };

var color = d3.scale.ordinal()
	.domain(["Lorem ipsum", "dolor sit", "amet", "consectetur", "adipisicing", "elit", "sed", "do", "eiusmod", "tempor", "incididunt"])
	.range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);

function randomData (){
	var labels = color.domain();
	return labels.map(function(label){
		return { label: label, value: Math.random() }
	});
}

change(randomData());

d3.select(".randomize")
	.on("click", function(){
		change(randomData());
	});


function change(data) {

	/* ------- PIE SLICES -------*/
  
  var startSlice = {
     startAngle: 0,
     endAngle: 0,
     padAngle:0,
     value:0,
     data: {lable:"",value:0}
  }

  var slice = svg.select(".slices").selectAll("path.slice")
		.data(pie(data), 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) {
			if(!this._current) this._current = startSlice;
      else 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 -------*/

	var text = svg.select(".labels").selectAll("text")
		.data(pie(data), 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(pie(data), 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();
};
body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  width: 400px;
  height: 400px;
  position: relative;
}

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

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

polyline{
	opacity: .3;
	stroke: black;
	stroke-width: 2px;
	fill: none;
}
<!DOCTYPE html>
<meta charset="utf-8">

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

<script src="http://d3js.org/d3.v3.min.js"></script>

</body>

关于javascript - 制作 D3 Pie v4 示例 - 在初始渲染时设置动画，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48567446/

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