func (v Vec2) DistSqr(v1 Vec2) float32 {
	dx := v1[0] - v[0]
	dy := v1[1] - v[1]
	return dx*dx + dy*dy
}
func (v Vec2) DistSqr(v1 Vec2) float32 {
	dx := v1[0] - v[0]
	dy := v1[1] - v[1]
	return dx*dx + dy*dy
}
func ( v Vec2 ) DistSqr ( v1 Vec2 ) float32 { dx := v1 [ 0 ] - v [ 0 ] dy := v1 [ 1 ] - v [ 1 ] return dx * dx + dy * dy }
// DistSqr returns the square of the distance between two points.
DistSqr returns the square of the distance between two points .