Function corner

external/.d3.js:11168–11173

(p, direction)

  }

  function corner(p, direction) {
    return abs$1(p[0] - x0) < epsilon$1 ? direction > 0 ? 0 : 3
        : abs$1(p[0] - x1) < epsilon$1 ? direction > 0 ? 2 : 1
        : abs$1(p[1] - y0) < epsilon$1 ? direction > 0 ? 1 : 0
        : direction > 0 ? 3 : 2; // abs(p[1] - y1) < epsilon
  }

  function compareIntersection(a, b) {
    return comparePoint(a.x, b.x);