Old school D3 from simpler times

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jfourmond

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v5.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    const src = { x:100, y:100 };
    const dst = { x:800, y:400 };	
    
    // Feel free to change or delete any of the code you see in this editor!
    const svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

const line = d3.line()
    	.x((d) => d.x)
    	.y((d) => d.y);
    
    const path = svg.append("path")
    	.attr("d", line([src, dst]))
      .attr("fill", "none")
      .attr("stroke", "#cccccc")
      .attr("stroke-linejoin", "round")
      .attr("stroke-linecap", "round")
      .attr("stroke-width", 1);
    
    const c1 = svg.append("circle")
    	.attr("stroke", "#fff")
      .attr("stroke-width", 1.5)
      .attr("r", 15)
      .attr("fill", "red")
    	.attr("cx", src.x)
      .attr("cy", src.y);
    
    const c2 = svg.append("circle")
    	.attr("stroke", "#fff")
      .attr("stroke-width", 0.5)
      .attr("r", 15)
      .attr("fill", "green")
    	.attr("cx", dst.x)
      .attr("cy", dst.y);
    
    c1.on("click", function() {
          svg.append("line")
            .attr("x1", src.x)
            .attr("y1", src.y)
          	.attr("x2", src.x)
          	.attr("y2", src.y)
          	.attr("stroke", "#fe2d2d")
      			.attr("stroke-width", 1.5)
          	.transition().duration(1000).ease(d3.easeLinear)
          		.attrTween("x1", function() {
            		const x = d3.interpolateNumber(src.x, dst.x);
  							return function(t) {
                  let nxt = x(t-0.05);
                  if(nxt < src.x) nxt = src.x;
    							return nxt;
  							};
          		})
            	.attrTween("y1", function() {
            		const y = d3.interpolateNumber(src.y, dst.y);
  							return function(t) {
                  let nxt = y(t-0.05);
                  if(nxt < src.y) nxt = src.y;
    							return nxt;
  							};
          		})
          		.attr("x2", dst.x)
          		.attr("y2", dst.y)
          		.on('end', function() {
            		d3.select(this).remove();
          		});
    });

</script>
</body>

https://d3js.org/d3.v5.min.js