d3js很好地添加了过渡点 [英] d3js nicely transition lines with added points

问题描述

说我有一个用d3创建的path，例如:

Say I have a path I created with d3 something like:

line = d3.line()
    .curve(d3.curveLinear)
    .x(function(d) { return x(d.x);})
    .y(function(d) { return y(d.y); });

data = [{x: 0, y: 0}, {x: 5, y: 5}, {x:10, y:10}];

myLine = svg.append("path")
        .attr("fill", "none")
        .attr("stroke", "steelblue")
        .datum(data)
        .attr("d", line);

这会在0到10之间形成一条对角线.现在，如果我更新数据进行一些更改并添加一些点:

This makes a nice diagonal line from 0 to 10. Now if I update my data to make some changes and add some points:

data = [{x: 1, y: 1}, {x:2, y:3}, {x: 6, y: 7}, {x:9, y:9}];

并更新我的台词

myLine.datum(data).transition().duration(1000).attr("d", line);

它给出了一个怪异的过渡，它将现有路径滑动到适合新路径的前三个点，并笨拙地将最后一点添加到末尾.

It gives a weird transition where it slides the existing path to fit the first three points of the new path and awkwardly adds the final point to the end.

类似地，如果我将其更新为更少的点，它会缩短线，然后将其余部分滑移，而不仅仅是重新调整其位置.

Similarly, if I update it to have fewer points, it shortens the line and then slides the remainder over, instead of just reshaping the line where it is.

我了解为什么发生这种情况，但是我想知道是否有一种方法可以创建更平滑的过渡.

I understand why this happens, but I'm wondering if there's a way to create a more smooth transition.

推荐答案

您应该看一下 github

.attrTween('d', function () { 
    return d3.interpolatePath(line(data), line(data2)); 
});

看看这个小提琴

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