public void ShouldReturnActualAngleOfVectorOnXYPlane()
{
PVector vectorA = new PVector(1, 1, 2);
float theta = vectorA.Heading(); // PI/4
float expectedTheta = (float)Math.PI / 4;
Assert.Equal(expectedTheta, theta);
vectorA.Set(1, 0);
theta = vectorA.Heading(); // 0
expectedTheta = 0f;
Assert.Equal(expectedTheta, theta);
vectorA.Set(0, 1);
theta = vectorA.Heading(); // PI/2
expectedTheta = (float)Math.PI / 2;
Assert.Equal(expectedTheta, theta);
}
public void ShouldCreateASameRandom2DUnitVectorFromGivenRandomObjectAndSetTarget()
{
Random random = new Random(1);
PVector target = new PVector();
PVector vectorA = PVector.Random2D(target, random);
float angle = vectorA.Heading();
float expectedAngle = 1.56243074f;
Assert.Same(target, vectorA);
Assert.NotNull(vectorA);
Assert.Equal(expectedAngle, angle);
}
public void ShouldCreateASameRandom2DUnitVectorFromGivenRandomObject()
{
Random random = new Random(1);
PVector vectorA = PVector.Random2D(random);
float angle = vectorA.Heading();
float expectedAngle = 1.56243074f;
Assert.NotNull(vectorA);
Assert.Equal(expectedAngle, angle);
random = new Random(1000);
vectorA = PVector.Random2D(random);
angle = vectorA.Heading();
expectedAngle = 0.9522636f;
Assert.NotNull(vectorA);
Assert.Equal(expectedAngle, angle);
}
public void ShouldCreateUnitVectorFromGivenAngle()
{
float angle = (float)Math.PI / 2;
PVector vectorA = PVector.FromAngle(angle);
float calculatedAngle = vectorA.Heading();
float calculatedMagnitude = vectorA.Mag();
Assert.Equal(angle, calculatedAngle);
float diff = (float)Math.Abs(1f - calculatedMagnitude);
Assert.True(diff < ROUNDING_ERROR);
angle = (float)Math.PI / 4;
vectorA = PVector.FromAngle(angle);
calculatedAngle = vectorA.Heading();
calculatedMagnitude = vectorA.Mag();
Assert.Equal(angle, calculatedAngle);
diff = (float)Math.Abs(1f - calculatedMagnitude);
Assert.True(diff < ROUNDING_ERROR);
}