D3 (v5) 中的 SVG 路径转换无法正常工作
SVG path transition in D3 (v5) not working properly
使用 D3 v5.
根据 JSON 数据绘制我的签名
我无法在 v5 中为其设置动画，但在 v3 中可以正常工作。
const data = 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const padding = 10;
const maxX = d3.max(data, (d) => d.x);
const maxY = d3.max(data, (d) => d.y);
const x = d3.scaleLinear().domain([0, maxX]).range([padding, (600 - padding)]);
const y = d3.scaleLinear().domain([0, maxY]).range([padding, (600 - padding)]);
// Line generator
const line = d3
.line()
.x(function(d) {
return x(d.x);
})
.y(function(d) {
return y(d.y);
})
.curve(d3.curveCardinal);
// SVG container
const svg = d3.select('svg');
// Find the length of the line at each given point. (Draw hidden line with portion of the points and then remove.)
const lengthAt = [];
for (let i = 1; i < data.length - 1; i++) {
let path = svg
.append('path')
.attr('d', line(data.slice(i)))
.attr('class', 'temp')
.attr('visibility', 'hidden');
lengthAt.push(path.node().getTotalLength());
}
svg.selectAll('.temp').remove();
// Add the path
let path = svg
.append('path')
.attr('d', () => line(data))
.attr('stroke', 'steelblue')
.attr('stroke-width', 2)
.attr('fill', 'none');
const totalLength = path.node().getTotalLength();
path.attr({ 'stroke-dasharray': totalLength + ' ' + totalLength, 'stroke-dashoffset': totalLength });
// Transition will be chained from either the original path or the last transition.
let transitionFrom = path;
// Start at 1 since no transition needed to first point.
for (let i = 1; i < data.length; i++) {
transitionFrom = transitionFrom
.transition()
.duration(data[i].time - data[i - 1].time)
.ease(d3.easeLinear)
.attr('stroke-dashoffset', lengthAt[i - 1] || 0);
}
<script src="https://d3js.org/d3.v5.min.js"></script>
<div id="signature">
<svg width="600" height="600"></svg>
</div>
如果你想要fiddle:
v3（工作）：https://jsfiddle.net/m9xhgt5a/
v5（不工作）：https://jsfiddle.net/x0orptsh/
相同的数据，相同的代码，相同的形状。
无法弄清楚确切的问题是什么。
您只是忘记拆分笔画属性设置器。
只需更换
path.attr({ 'stroke-dasharray': totalLength + ' ' + totalLength, 'stroke-dashoffset': totalLength });
和
path
.attr('stroke-dasharray', totalLength + ' ' + totalLength)
.attr('stroke-dashoffset', totalLength);
编辑：运行 fiddle。
使用 D3 v5.
根据 JSON 数据绘制我的签名我无法在 v5 中为其设置动画，但在 v3 中可以正常工作。
const data = 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const padding = 10;
const maxX = d3.max(data, (d) => d.x);
const maxY = d3.max(data, (d) => d.y);
const x = d3.scaleLinear().domain([0, maxX]).range([padding, (600 - padding)]);
const y = d3.scaleLinear().domain([0, maxY]).range([padding, (600 - padding)]);
// Line generator
const line = d3
.line()
.x(function(d) {
return x(d.x);
})
.y(function(d) {
return y(d.y);
})
.curve(d3.curveCardinal);
// SVG container
const svg = d3.select('svg');
// Find the length of the line at each given point. (Draw hidden line with portion of the points and then remove.)
const lengthAt = [];
for (let i = 1; i < data.length - 1; i++) {
let path = svg
.append('path')
.attr('d', line(data.slice(i)))
.attr('class', 'temp')
.attr('visibility', 'hidden');
lengthAt.push(path.node().getTotalLength());
}
svg.selectAll('.temp').remove();
// Add the path
let path = svg
.append('path')
.attr('d', () => line(data))
.attr('stroke', 'steelblue')
.attr('stroke-width', 2)
.attr('fill', 'none');
const totalLength = path.node().getTotalLength();
path.attr({ 'stroke-dasharray': totalLength + ' ' + totalLength, 'stroke-dashoffset': totalLength });
// Transition will be chained from either the original path or the last transition.
let transitionFrom = path;
// Start at 1 since no transition needed to first point.
for (let i = 1; i < data.length; i++) {
transitionFrom = transitionFrom
.transition()
.duration(data[i].time - data[i - 1].time)
.ease(d3.easeLinear)
.attr('stroke-dashoffset', lengthAt[i - 1] || 0);
}
<script src="https://d3js.org/d3.v5.min.js"></script>
<div id="signature">
<svg width="600" height="600"></svg>
</div>
如果你想要fiddle:
v3（工作）：https://jsfiddle.net/m9xhgt5a/
v5（不工作）：https://jsfiddle.net/x0orptsh/
相同的数据，相同的代码，相同的形状。
无法弄清楚确切的问题是什么。
您只是忘记拆分笔画属性设置器。
只需更换
path.attr({ 'stroke-dasharray': totalLength + ' ' + totalLength, 'stroke-dashoffset': totalLength });
和
path
.attr('stroke-dasharray', totalLength + ' ' + totalLength)
.attr('stroke-dashoffset', totalLength);
编辑：运行 fiddle。