using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnitTestSharp;
using Azimuth;
using Lodestone.DiscreteCollisionDetection;

namespace Lodestone.UnitTests.DiscreteCollisionDetection
{
	class PointToSegment : TestFixture
	{
		public static readonly Vector s = new Vector(1, 0);
		public static readonly Vector e = new Vector(0, 0);

		Scalar wA, wB;

		public void Basic()
		{
			Vector p = new Vector(0.5, 10);

			Vector pPrime = Lodestone.DiscreteCollisionDetection.PointToSegment.ClosestPointOnLineSegmentToPoint(s, e, p, out wA, out wB);
			CheckEqual(new Vector(0.5, 0), pPrime);
			CheckEqual(0.5, wA);
			CheckEqual(0.5, wB);
		}

		public void Negative_T()
		{
			Vector p = new Vector(-10, 10);

			Vector pPrime = Lodestone.DiscreteCollisionDetection.PointToSegment.ClosestPointOnLineSegmentToPoint(s, e, p, out wA, out wB);
			CheckEqual(e, pPrime);
			CheckEqual(0, wA);
			CheckEqual(1, wB);
		}

		public void GrOne_T()
		{
			Vector p = new Vector(10, 10);

			Vector pPrime = Lodestone.DiscreteCollisionDetection.PointToSegment.ClosestPointOnLineSegmentToPoint(s, e, p, out wA, out wB);
			CheckEqual(s, pPrime);
			CheckEqual(1, wA);
			CheckEqual(0, wB);
		}

		public void Degenerate()
		{
			Vector p = new Vector(10, 10);

			Vector pPrime = Lodestone.DiscreteCollisionDetection.PointToSegment.ClosestPointOnLineSegmentToPoint(e, e, p, out wA, out wB);
			CheckEqual(e, pPrime);
		}
	}
}