我有这个函数可以在两点之间创建一条曲线
var amountOfCurve = (d.noOfSameConnections+1); //between 0 and 10
var dy = d.target.x - d.source.x,
dx = d.target.y - d.source.y,
dr = Math.sqrt(dx * dx + dy * dy) *(amountOfCurve);
return "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + (d.target.x) + "," + (d.target.y);
某些链接具有相同的源和目标。我在 noOfSameConnections 中解决了这个问题。但我想要的是不同大小的曲线，因为两个节点之间最多只能有两个链接，我希望链接以另一种方式弯曲。所以我会做这样的事情:
if(d.noOfSameConnections === 1){
//curve one way
} else {
//curve the other
}
但我似乎不知道如何切换曲线:(
最佳答案
圆弧的方向可以通过sweep控制flag .
<!DOCTYPE html>
<html>
<head>
<script data-require="d3@3.5.3" data-semver="3.5.3" src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script>
</head>
<body>
<script>
var svg = d3.select('body')
.append('svg')
.attr('width', 500)
.attr('height', 500);
var d = {
source: {
x: 10,
y: 10
},
target: {
x: 490,
y: 490
}
};
var dy = d.target.x - d.source.x,
dx = d.target.y - d.source.y,
dr = Math.sqrt(dx * dx + dy * dy) * 0.8;
var largeSweep = 0;
var sweep = 1;
svg.append("path")
.attr("d", "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 " + largeSweep + "," + sweep + " " + d.target.x + "," + d.target.y)
.style("fill", "none")
.style("stroke", "steelblue")
.style("stoke-width", 2);
largeSweep = 0;
sweep = 0;
svg.append("path")
.attr("d", "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 " + largeSweep + "," + sweep + " " + d.target.x + "," + d.target.y)
.style("fill", "none")
.style("stroke", "orange")
.style("stoke-width", 2);
</script>
</body>
</html>关于javascript - 如何更改 SVG 元素上的曲线，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33898739/