d3-jsnext/src/svg/diagonal.js

d3, but futuristic

import { d3_functor } from '../core/functor';
import { d3_target } from '../core/target';
import { d3_source } from '../core/source';
import { d3$svg } from './svg';

var d3$svg$diagonal;

d3$svg$diagonal = function() {
  var source = d3_source,
      target = d3_target,
      projection = d3_svg_diagonalProjection;

  function diagonal(d, i) {
    var p0 = source.call(this, d, i),
        p3 = target.call(this, d, i),
        m = (p0.y + p3.y) / 2,
        p = [p0, {x: p0.x, y: m}, {x: p3.x, y: m}, p3];
    p = p.map(projection);
    return "M" + p[0] + "C" + p[1] + " " + p[2] + " " + p[3];
  }

  diagonal.source = function(x) {
    if (!arguments.length) return source;
    source = d3_functor(x);
    return diagonal;
  };

  diagonal.target = function(x) {
    if (!arguments.length) return target;
    target = d3_functor(x);
    return diagonal;
  };

  diagonal.projection = function(x) {
    if (!arguments.length) return projection;
    projection = x;
    return diagonal;
  };

  return diagonal;
};

function d3_svg_diagonalProjection(d) {
  return [d.x, d.y];
}

export { d3$svg$diagonal, d3_svg_diagonalProjection };