freesewing/markdown/dev/reference/api/utils/circlesintersect/en.md

title
circlesIntersect()

array | false utils.circlesIntersect(
  Point centerA, 
  float radiusA, 
  Point centerB, 
  float radiusB, 
  string sort = 'x'
)

Finds the intersections between two circles described by their center point and radius.

The 5th and last parameter controls the sorting of the found intersections. When this returns 2 intersections, you can choose how they are ordered in the returned array:

Set sort to:

• x : The point with the lowest X-coordinate will go first (left to right)
• y : The point with the lowest Y-coordinate will go first (top to bottom)

let { Point, points, Snippet, snippets, utils } = part.shorthand();

points.A = new Point(10, 10)
  .attr("data-circle", 15)
  .attr("data-circle-class", "fabric");
points.B = new Point(30, 30)
  .attr("data-circle", 35)
  .attr("data-circle-class", "fabric");
points.C = new Point(90, 10)
  .attr("data-circle", 15)
  .attr("data-circle-class", "various");
points.D = new Point(110, 30)
  .attr("data-circle", 35)
  .attr("data-circle-class", "various");

let intersections1 = utils.circlesIntersect(
  points.A,
  points.A.attributes.get("data-circle"),
  points.B,
  points.B.attributes.get("data-circle")
);
let intersections2 = utils.circlesIntersect(
  points.C,
  points.C.attributes.get("data-circle"),
  points.D,
  points.D.attributes.get("data-circle"),
  "y"
);

snippets.first1 = new Snippet("bnotch", intersections1[0]);
snippets.second1 = new Snippet("notch", intersections1[1]);
snippets.first2 = new Snippet("bnotch", intersections2[0]);
snippets.second2 = new Snippet("notch", intersections2[1]);