Statics Fields Relevant to Vector2Bvr Objects

xVector2: A two-dimensional vector behavior (Vector2Bvr object) that represents the unit vector on the x-axis. The vector's length is always 1, the direction is always the same as the positive x-axis.
yVector2: A two-dimensional vector behavior (Vector2Bvr object) that represents the unit vector on the y-axis. The vector's length is always 1, the direction is always the same as the positive y-axis.
zeroVector2: A two-dimensional vector behavior (Vector2Bvr object) that represents the null vector. The vector's length is always 0, the direction is undefined.