getSqSegDist function

double getSqSegDist(dynamic p, dynamic p1, dynamic p2)

Implementation

double getSqSegDist(p, p1, p2) {
  var x = p1.x, y = p1.y, dx = p2.x - x, dy = p2.y - y;

  if (dx != 0 || dy != 0) {
    var t = ((p.x - x) * dx + (p.y - y) * dy) / (dx * dx + dy * dy);

    if (t > 1) {
      x = p2.x;
      y = p2.y;
    } else if (t > 0) {
      x += dx * t;
      y += dy * t;
    }
  }

  dx = p.x - x;
  dy = p.y - y;

  return dx * dx + dy * dy;
}