public void Property_SignedAngleTo_IsAntiSymmetric(Direction2D direction1, Direction2D direction2)
{
var angle1 = direction2.To3D().SignedAngleTo(direction1.To3D());
var angle2 = direction1.To3D().SignedAngleTo(direction2.To3D());
if (angle1 == StraightAngle || angle1 == -StraightAngle)
{
(angle2 == StraightAngle || angle2 == -StraightAngle).Should().BeTrue();
}
else
{
angle1.Should().Be(-angle2);
}
}
public void Property_CounterClockwiseAngleTo_FlippingTheArgumentsYieldsExplementaryAngle(Direction2D direction1,
Direction2D direction2)
{
var d1 = direction1.To3D();
var d2 = direction2.To3D();
var angle1 = d1.CounterClockwiseAngleTo(d2);
var angle2 = d2.CounterClockwiseAngleTo(d1);
if (angle1 == ZeroAngle && angle2 == ZeroAngle)
{
angle1.Should().Be(-angle2);
}
else
{
(angle1 + angle2).Should().Be(FullCircle);
}
}
public void Property_CounterClockwiseAngleTo_IsNonNegative(Direction2D direction1, Direction2D direction2)
{
direction1.To3D().CounterClockwiseAngleTo(direction2.To3D()).Should().BeGreaterOrEqualTo(ZeroAngle);
}
public void Property_SignedAngleTo_DoesNotExceedStraightAngle(Direction2D direction1, Direction2D direction2)
{
direction1.To3D().SignedAngleTo(direction2.To3D())
.Should()
.BeLessOrEqualTo(StraightAngle);
}