mermaid-js / mermaid / 4740051045

  var x = node.x;

  var y = node.y;

  // Rectangle intersection algorithm from:

  // https://math.stackexchange.com/questions/108113/find-edge-between-two-boxes

  var dx = point.x - x;

  var dy = point.y - y;

  var w = node.width / 2;

  var h = node.height / 2;

  var sx, sy;

  if (Math.abs(dy) * w > Math.abs(dx) * h) {

    // Intersection is top or bottom of rect.

    if (dy < 0) {

      h = -h;

    }

    sx = dy === 0 ? 0 : (h * dx) / dy;

    sy = h;

  } else {

    // Intersection is left or right of rect.

    if (dx < 0) {

      w = -w;

    }

    sx = w;

    sy = dx === 0 ? 0 : (w * dy) / dx;

  }

  return { x: x + sx, y: y + sy };

};