public void dotProduct_NegativeValue()
{
vector = new Vector(1.0, 2.0, 3.0);
vector2 = new Vector(-4.0, -25.0, -1.0);
Assert.AreEqual((-4.0 -50.0 -3.0), vector.dotProduct(vector2));
vector2 = new Vector(-4.0, 5.0, 1.0);
Assert.AreEqual((-4.0 + 10.0 + 3.0), vector.dotProduct(vector2));
}
public void dotProduct_AllGreaterThanTen()
{
vector = new Vector(12.0, 15.0, 20.0);
vector2 = new Vector(20.0, 20.0, 20.0);
Assert.AreEqual(((12.0 * 20.0) + (15.0 * 20.0) + (20.0 * 20.0)), vector.dotProduct(vector2));
}
/// <summary>
/// Calculates the orthogonal projection of a vector on a differnet vector
/// </summary>
/// <param name="toVector">The vector which is projected upon</param>
/// <returns>The projected vector</returns>
public Vector orthogonalProjection(Vector toVector)
{
Vector returnVector = null;
if (!((toVector.x == 0) && (toVector.y == 0) && (toVector.z == 0)))
{
double fraction = this.dotProduct(toVector) / toVector.dotProduct(toVector);
returnVector = new Vector(fraction * toVector.x, fraction * toVector.y, fraction * toVector.z);
}
return returnVector;
}
public void dotProduct_WithSelf()
{
vector = new Vector(1.0, 2.0, 3.0);
Assert.AreEqual(1+4+9, vector.dotProduct(vector));
}
public void dotProduct_WithNull()
{
vector = new Vector(1.0, 2.0, 3.0);
vector2 = null;
Assert.AreEqual(0.0, vector.dotProduct(vector2));
vector2.dotProduct(vector);
}
public void dotProduct_AllZero()
{
vector = new Vector(0.0, 0.0, 0.0);
Assert.AreEqual(0.0, vector.dotProduct(vector));
}
public void orthogonalProjection_NegativeValues()
{
vector = new Vector(1.0, 2.0, 3.0);
vector2 = new Vector(-4.0, -25.0, -1.0);
double fraction = vector.dotProduct(vector2)/vector2.dotProduct(vector2);
Vector newVector = new Vector (fraction*(-4.0), (-25.0) * fraction, (-1.0)* fraction);
Assert.IsTrue(newVector.Equals(vector.orthogonalProjection(vector2)));
}
public void orthogonalProjection_AllGreaterThanTen()
{
vector = new Vector(12.0, 15.0, 20.0);
vector2 = new Vector(20.0, 20.0, 20.0);
double fraction = vector.dotProduct(vector2) / vector.dotProduct(vector);
Vector newVector = new Vector(12 * fraction, 15 * fraction, 20 * fraction);
}
public void length_ValidInput()
{
vector = new Vector(-4.0, -25.0, -1.0);
double expected = Math.Sqrt(vector.dotProduct(vector));
Assert.AreEqual(expected, vector.length());
vector2 = new Vector(12.0, 15.0, 20.0);
expected = Math.Sqrt(vector2.dotProduct(vector2));
Assert.AreEqual(expected, vector2.length());
}