【发布时间】：2021-07-01 13:40:00
【问题描述】：
我试图向图表添加过渡效果，但它不起作用。 在这种情况下不可能吗？因为我尝试了 d3.js 网站中提到的所有步骤。 我正在尝试在条形和路径、矩形和文本上添加过渡。
下面是我的尝试：
.transition()
.duration(2000)
任何帮助都将不胜感激。
代码下方：
const barData = [{
"Time": "2019",
"Value": 5388
},
{
"Time": "2020",
"Value": 6453
},
{
"Time": "2021",
"Value": -4345
},
{
"Time": "2022",
"Value": 7345
},
{
"Time": "2023",
"Value": 8345
},
{
"Time": "2024",
"Value": 5345
},
{
"Time": "2025",
"Value": 6345
},
{
"Time": "2026",
"Value": 3345
}
];
const container = d3.select('#graph');
const divWidth = parseInt(container.style('width'));
const divHeight = parseInt(container.style('height'));
// Consider this width and Height are dynamic for div "graphID" because I am trying to responsive design
const margin = {
top: 50,
right: 50,
bottom: 50,
left: 50
};
const width = divWidth - margin.left - margin.right;
const height = divHeight - margin.top - margin.bottom;
//To add svg in the visualization node i.e Dome node
const svg = container.append("svg")
.attr("width", divWidth)
.attr("height", divHeight)
.append("g")
.attr("transform", `translate(${margin.left},${margin.top})`);
//To add tooltip for bar
const tooltip = d3.select("body").append("div").attr("class", "toolTip");
const defs = svg.append("defs");
const marker = defs.append("marker")
.attr("id", "arrowhead")
.attr("markerWidth", "10")
.attr("markerHeight", "7")
.attr("refX", "0")
.attr("refY", "3.5")
.attr("orient", "auto")
const polygon = marker.append("polygon")
.attr("fill", "gray")
.attr("points", "0 0, 10 3.5, 0 7")
const xScale = d3.scaleBand()
.domain(barData.map(d => d.Time))
.range([0, width + margin.right]);
const xAxis = d3.axisBottom(xScale)
//Adding g attribute to svg for x axis
const yAxisMax = barData.reduce((max, item) => Math.max(max, item.Value), 0) * 1.5;
const yAxisMin = barData.reduce((min, item) => Math.min(min, item.Value), 0) * 1.5;
const yAxisRange = Math.max(yAxisMax, Math.abs(yAxisMin));
const yScale = d3.scaleLinear()
.domain([-yAxisRange, yAxisRange])
.range([height, 0]);
const yAxis = d3.axisLeft(yScale).ticks(4);
svg.append('g')
.call(yAxis);
const bars = svg.selectAll('g.bar')
.data(barData)
.enter()
.append('g')
.classed('bar', true)
.attr('transform', d => `translate(${xScale(d.Time) + xScale.bandwidth() / 2}, 0)`);
bars.append('rect')
.attr('x', -20)
.attr('width', 40)
.attr('y', d => Math.min(yScale(d.Value), height/2))
.attr('height', d => d.Value > 0 ?
(height/2 - yScale(d.Value)) :
(yScale(d.Value) - height/2)
)
.attr('fill', 'blue')
.on("mousemove", onMouseOver)
.on("mouseout", onMouseOut);
function onMouseOver(d, i) {
tooltip
.style("left", d3.event.pageX - 50 + "px")
.style("top", d3.event.pageY - 70 + "px")
.style("display", "inline-block")
.html("Year: " + (d.Time) + "<br>" + "Value: " + (d.Value));
d3.select(this).attr('fill', "#eec42d");
}
function onMouseOut(d, i) {
tooltip.style("display", "none");
d3.select(this).attr('fill', "blue");
}
bars.append('text')
.text(d => d.Value)
.attr('text-anchor', 'middle')
.attr('alignment-baseline', d => d.Value > 0 ? 'baseline' : 'hanging')
.attr('y', d => yScale(d.Value))
.attr('dy', d => d.Value > 0 ? -5 : 5);
bars.filter((d, i) => i < barData.length - 1)
.append('path')
.attr('d', (d, i) => `M 5,${Math.min(yScale(d.Value) - 20, height/2)} V ${Math.min(yScale(d.Value), yScale(barData[i + 1].Value)) - 60} H ${xScale.bandwidth() - 5} V ${Math.min(yScale(barData[i + 1].Value) - 25, height/2 - 10)}`)
.style('stroke', 'gray')
.style('fill', 'none')
.attr('marker-end', 'url(#arrowhead)')
bars.filter((d, i) => i < barData.length - 1)
.append('rect')
.attr('x', 15)
.attr('y', (d, i) => Math.min(yScale(d.Value), yScale(barData[i + 1].Value)) - 70)
.attr('width', xScale.bandwidth() - 30)
.attr('height', 20)
.attr('rx', 10)
.style('fill', 'white')
.style('stroke', 'gray');
bars.filter((d, i) => i < barData.length - 1)
.append('text')
.text((d, i) => `${barData[i + 1].Value > d.Value ? '+' : ''}${Math.round((barData[i + 1].Value / d.Value * 100) - 100)}%`)
.attr('x', xScale.bandwidth() / 2)
.attr('y', (d, i) => Math.min(yScale(d.Value), yScale(barData[i + 1].Value)) - 56)
.attr('text-anchor', 'middle')
.style('fill', 'black');
const xAxisG = svg.append('g')
.attr("transform", `translate(0,${height/2})`)
.call(xAxis);
xAxisG.selectAll('.tick').each(function() {
const tick = d3.select(this);
const text = tick.select('text').text();
const data = barData.find(d => d.Time === text);
if (data.Value < 0) {
tick.select('text').style('fill', 'white');
tick.select('line').style('stroke', 'white');
}
}) #graph {
width: 700px;
height: 500px;
}
text {
font-size: 12px;
font-family: "Ubuntu";
}
.toolTip {
position: absolute;
display: none;
min-width: 80px;
height: auto;
background: none repeat scroll 0 0 #ffffff;
border: 1px solid #6F257F;
padding: 5px;
text-align: left;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<div id="graph">
</div>【问题讨论】：
-
我不清楚您要过渡什么以及在什么条件下；你能澄清一下吗？
标签： javascript svg d3.js