main/src/georegression/struct/point/Point2D_I32.java
public int distance2( Point2D_I32 a ) {
		int dx = x-a.x;
		int dy = y-a.y;

		return dx*dx + dy*dy;
	}
public int distance2( Point2D_I32 a ) {
		int dx = x-a.x;
		int dy = y-a.y;

		return dx*dx + dy*dy;
	}
<p>
Returns the Euclidean distance squared from 'this' to 'a'.  No floating point
operations are used.
</p>

<p>
d<sup>2</sup> =  (this.x-a.x)<sup>2</sup> + (this.y-a.y)<sup>2</sup>
</p>

@param a Point that distance is computed from.
@return Euclidean distance squared.