public void CanSubtractTwoVectors()
{
var v1 = Tuple.NewVector(3, 2, 1);
var v2 = Tuple.NewVector(5, 6, 7);
Assert.Equal(Tuple.NewVector(-2, -4, -6), v1 - v2);
}
public void CanSubtractTwoPoints()
{
var p1 = Tuple.NewPoint(3, 2, 1);
var p2 = Tuple.NewPoint(5, 6, 7);
Assert.Equal(Tuple.NewVector(-2, -4, -6), p1 - p2);
}
public void CanSubtractAVectorFromAPoint()
{
var p = Tuple.NewPoint(3, 2, 1);
var v = Tuple.NewVector(5, 6, 7);
Assert.Equal(Tuple.NewPoint(-2, -4, -6), p - v);
}
public void CanSubtractAVectorFromTheZeroVector()
{
var zero = Tuple.NewVector(0, 0, 0);
var v = Tuple.NewVector(1, -2, 3);
Assert.Equal(Tuple.NewVector(-1, 2, -3), zero - v);
}
public void CanCalculateTheDotProductOfTwoVectors()
{
var a = Tuple.NewVector(1, 2, 3);
var b = Tuple.NewVector(2, 3, 4);
Assert.True(FloatMath.AreEqual(20, a.Dot(b)));
}
public void CanCalculateTheCrossProductOfTwoVectors()
{
var a = Tuple.NewVector(1, 2, 3);
var b = Tuple.NewVector(2, 3, 4);
Assert.Equal(Tuple.NewVector(-1, 2, -1), a.Cross(b));
Assert.Equal(Tuple.NewVector(1, -2, 1), b.Cross(a));
}
private static void Main(string[] args)
{
Console.WriteLine("Projectile Demo");
var p = new Projectile(Tuple.NewPoint(0, 1, 0), Tuple.NewVector(1, 1, 0).Normalized);
var w = new World(Tuple.NewVector(0, -0.1, 0), Tuple.NewVector(-0.01, 0, 0));
var numTicks = 0;
Console.WriteLine($"Y: {p.Position.Y}, Ticks: {numTicks}");
while (p.Position.Y > 0)
{
p = Tick(w, p);
numTicks++;
Console.WriteLine($"Y: {p.Position.Y}, Ticks: {numTicks}");
}
Console.WriteLine($"It took {numTicks} ticks to hit the ground.");
Console.Read();
}
public void TupleFactoryCanCreateAVector()
{
var p = Tuple.NewVector(4, -4, 3);
Assert.Equal(new Tuple4(4, -4, 3, 0), p);
}
public void MagnitudeOfANormalizedVectorEqualsOne()
{
var v = Tuple.NewVector(1, 2, 3);
Assert.True(FloatMath.AreEqual(1, v.Normalized.Magnitude));
}
public void CanNormalizeAVector(double v1, double v2, double v3, double r1, double r2, double r3)
{
var v = Tuple.NewVector(v1, v2, v3);
Assert.Equal(Tuple.NewVector(r1, r2, r3), v.Normalized);
}
public void VectorsHaveAFloatingPointMagnitude(double a, double b, double c)
{
var v = Tuple.NewVector(a, b, c);
Assert.True(FloatMath.AreEqual(v.Magnitude, Math.Sqrt(14)));
}
public void VectorsHaveAMagnitude(double a, double b, double c, double expected)
{
var v = Tuple.NewVector(a, b, c);
Assert.True(FloatMath.AreEqual(v.Magnitude, expected));
}
public Tuple4 Cross(Tuple4 other)
{
return(Tuple.NewVector(Y * other.Z - Z * other.Y,
Z * other.X - X * other.Z,
X * other.Y - Y * other.X));
}