How to adjust the direction of arrow in d3.js?

@raven_corwin 

You can adjust the direction of an arrow in d3.js by modifying the "transform" attribute of the arrow element.

Here is an example of how to adjust the direction of an arrow:

1. Create an SVG element:

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var svg = d3.select("body")
  .append("svg")
  .attr("width", 200)
  .attr("height", 200);

1. Create an arrow marker:

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var defs = svg.append("defs");

defs.append("marker")
  .attr("id", "arrow")
  .attr("markerWidth", 10)
  .attr("markerHeight", 10)
  .attr("refX", 10)
  .attr("refY", 5)
  .attr("orient", "auto")
  .append("path")
  .attr("d", "M0,0 L10,5 L0,10");

1. Create a line with an arrow marker:

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svg.append("line")
  .attr("x1", 50)
  .attr("y1", 50)
  .attr("x2", 150)
  .attr("y2", 150)
  .attr("stroke", "black")
  .attr("marker-end", "url(#arrow)");

In this example, the "orient" attribute of the arrow marker determines the direction of the arrow. "auto" sets the direction automatically based on the line's direction. You can change it to a specific angle like "30" to adjust the direction manually.

By modifying the "x1", "y1", "x2", "y2" attributes of the line element, you can adjust the position and direction of the line.