public void TestIsAcute()
{
Assert.AreEqual(AngleUtility.IsAcute(new Coordinate(10, 0), new Coordinate(0, 0), new Coordinate(5, 10)), true);
Assert.AreEqual(AngleUtility.IsAcute(new Coordinate(10, 0), new Coordinate(0, 0), new Coordinate(5, -10)), true);
// angle of 0
Assert.AreEqual(AngleUtility.IsAcute(new Coordinate(10, 0), new Coordinate(0, 0), new Coordinate(10, 0)), true);
Assert.AreEqual(AngleUtility.IsAcute(new Coordinate(10, 0), new Coordinate(0, 0), new Coordinate(-5, 10)), false);
Assert.AreEqual(AngleUtility.IsAcute(new Coordinate(10, 0), new Coordinate(0, 0), new Coordinate(-5, -10)), false);
}
/// <summary>
/// Tests whether a triangle is acute. A triangle is acute iff all interior
/// angles are acute. This is a strict test - right triangles will return
/// <tt>false</tt> A triangle which is not acute is either right or obtuse.
/// <para/>
/// Note: this implementation is not robust for angles very close to 90 degrees.
/// </summary>
/// <param name="a">A vertex of the triangle</param>
/// <param name="b">A vertex of the triangle</param>
/// <param name="c">A vertex of the triangle</param>
/// <returns>True if the triangle is acute.</returns>
public static Boolean IsAcute(Coordinate a, Coordinate b, Coordinate c)
{
if (!AngleUtility.IsAcute(a, b, c))
{
return(false);
}
if (!AngleUtility.IsAcute(b, c, a))
{
return(false);
}
if (!AngleUtility.IsAcute(c, a, b))
{
return(false);
}
return(true);
}