Imagine in d3 there are two nodes, node1 and node2, depicted as circles positioned next to each other horizontally. These nodes are connected by a short horizontal line (represented as a path).
I am curious about how to: (1) determine the midpoint of that connecting line/path, (2) assign a new identifier or name to that midpoint for programmable manipulation, (3) create new vertical lines/paths extending from that midpoint to additional nodes such as node3, node4, and node5.
To create connections between nodes, you can calculate the midpoint of each line and draw lines from that point to other nodes using the following script. Check out this JSFiddle for a live demo.
function establishConnections(d){
var xStart = nodes[d.source].x;
var xEnd = nodes[d.target].x;
var yStart = nodes[d.source].y;
var yEnd = nodes[d.target].y;
var otherNodes = nodes.filter(function(n,i){ return i!=d.source || i!=d.target });
otherNodes.forEach(function(otherNode){
svg.append("line")
.attr("x1",function(d){ return otherNode.x; })
.attr("y1",function(d){ return otherNode.y; })
.attr("x2",function(d){ return (xStart + xEnd)/2; })
.attr("y2",function(d){ return (yStart + yEnd)/2; })
.attr("class","connection-line");
});
}
linksEls.each(establishConnections);
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