/// <summary>
/// 计算反射后的功率
/// </summary>
/// <param name="Pi">入射功率</param>
/// <param name="ray">入射波束线段</param>
/// <param name="barrier">碰撞散射体线段</param>
/// <param name="dc">散射体介电常数</param>
/// <returns></returns>
public static double ReflectionLoss(double Pi, LineSegment ray, LineSegment barrier, double dc)
{
double angle = ray.Angle(barrier);
double theta_i = angle > Math.PI / 2 ? angle - Math.PI / 2 : Math.PI / 2 - angle;
double theta_t = Math.Asin(Math.Sin(theta_i) / Math.Sqrt(dc));
double tau = (Math.Cos(theta_i) - Math.Sqrt(dc) * Math.Cos(theta_t)) / (Math.Cos(theta_i) + Math.Sqrt(dc) * Math.Cos(theta_t));
return Pi * Math.Abs(tau);
}
///// <summary>
///// 自由空间路径损耗
///// </summary>
///// <param name="Pi"></param>
///// <param name="d"></param>
///// <param name="freq"></param>
///// <returns></returns>
//public static double FreeSpacePathLoss(double Pi, double d, double freq)
//{
// double dbi = 20 * Math.Log10(freq / 1e6) + 20 * Math.Log10(d / 1e3);
// double ratio = Math.Pow(10, (dbi / 10));
// return Pi / ratio;
//}
/// <summary>
/// 计算镜面反射角
/// </summary>
/// <param name="ray">入射波束线段</param>
/// <param name="barrier">产生碰撞的散射体线段</param>
/// <param name="dir">散射体的向量旋转方向</param>
/// /// <returns>出射角</returns>
public static double SpecularReflection(LineSegment ray, LineSegment barrier, SCATTER_SEG_DIRECTION dir)
{
double result;
double angle = ray.Angle(barrier);
if(dir == SCATTER_SEG_DIRECTION.CLOCKWISE)
{
result = barrier.DirectionRadian + angle;
result = result > Math.PI * 2 ? result - Math.PI * 2 : result;
}
else
{
result = barrier.DirectionRadian - angle;
result = result < 0 ? result + Math.PI * 2 : result;
}
return result;
}
/// <summary>
/// 线段类的单元测试
/// </summary>
/// <param name="epsilon"></param>
/// <returns></returns>
public static string RunTest(double epsilon=1e-3)
{
LineSegment This = new LineSegment();
LineSegment That = new LineSegment();
DateTime time = DateTime.Now;
StringBuilder sb = new StringBuilder("LineSegment Class Test Begin at " + time.ToString("yyyy-MM-dd HH:mm:ss") + "\n");
test_log.Add(time, "");
//test Length
sb.AppendLine("----------------------------");
sb.AppendLine("length test 1");
Debug.Assert(new LineSegment(new Point(0, 0), new Point(0, 0)).Length == 0, "length should be 0");
sb.AppendLine("length test 2");
Debug.Assert(new LineSegment(new Point(0, 1), new Point(1, 0)).Length == Math.Sqrt(2), "length should be sqrt(2)");
sb.AppendLine("length test 3");
Debug.Assert(new LineSegment(new Point(2, 0), new Point(0, 0)).Length == 2, "length should be 2");
sb.AppendLine("length test 4");
Debug.Assert(new LineSegment(new Point(0, 0), new Point(0, 2)).Length == 2, "length should be 2");
//test DirectionRadius
sb.AppendLine("----------------------------");
sb.AppendLine("direction test 1");
Debug.Assert(new LineSegment(new Point(0, 0), new Point(0, 0)).DirectionRadian == 0, "direction should be 0");
sb.AppendLine("direction test 2");
Debug.Assert(new LineSegment(new Point(1, 0), new Point(0, 0)).DirectionRadian == 0, "direction should be 0");
sb.AppendLine("direction test 3");
Debug.Assert(new LineSegment(new Point(0, 0), new Point(0, 1)).DirectionRadian == Math.PI / 2, "direction should be pi/2");
sb.AppendLine("direction test 4");
Debug.Assert(new LineSegment(new Point(0, 0), new Point(1, 0)).DirectionRadian == Math.PI, "direction should be pi");
sb.AppendLine("direction test 5");
Debug.Assert(new LineSegment(new Point(0, 1), new Point(0, 0)).DirectionRadian == Math.PI / 2 * 3, "direction should be pi/2*3");
sb.AppendLine("direction test 6");
Debug.Assert(new LineSegment(new Point(1, 0), new Point(0, 1)).DirectionRadian == Math.PI / 4, "direction should be pi/4");
sb.AppendLine("direction test 7");
Debug.Assert(new LineSegment(new Point(0, 0), new Point(1, 1)).DirectionRadian == Math.PI / 4 * 3, "direction should be pi/4*3");
sb.AppendLine("direction test 8");
Debug.Assert(new LineSegment(new Point(0, 1), new Point(1, 0)).DirectionRadian == Math.PI / 4 * 5, "direction should be pi/4*5");
sb.AppendLine("direction test 9");
Debug.Assert(new LineSegment(new Point(1, 1), new Point(0, 0)).DirectionRadian == Math.PI / 4 * 7, "direction should be pi/4*7");
//test Angle
sb.AppendLine("----------------------------");
This = new LineSegment(new Point(1, 0), new Point(0, 0));
sb.AppendLine("angle test 1");
That = new LineSegment(new Point(1, 0), new Point(0, 0));
Debug.Assert(This.Angle(That) == 0, "angle should be 0");
sb.AppendLine("angle test 2");
That = new LineSegment(new Point(0, 0), new Point(0, 1));
Debug.Assert(This.Angle(That) == Math.PI / 2, "angle should be pi/2");
sb.AppendLine("angle test 3");
That = new LineSegment(new Point(0, 0), new Point(1, 0));
Debug.Assert(This.Angle(That) == Math.PI, "angle should be pi");
sb.AppendLine("angle test 4");
That = new LineSegment(new Point(0, 1), new Point(0, 0));
Debug.Assert(This.Angle(That) == Math.PI / 2, "angle should be pi/2");
sb.AppendLine("angle test 5");
That = new LineSegment(new Point(1, 0), new Point(0, 1));
Debug.Assert(This.Angle(That) > Math.PI / 4 - epsilon && This.Angle(That) < Math.PI / 4 + epsilon, "angle should be pi/4");
sb.AppendLine("angle test 6");
Debug.Assert(new LineSegment(new Point(1, 0), new Point(0, 0)).Angle(new LineSegment(new Point(0, 0), new Point(1, 1))) == Math.PI / 4 * 3, "angle should be pi/4*3");
sb.AppendLine("angle test 7");
Debug.Assert(new LineSegment(new Point(1, 0), new Point(0, 0)).Angle(new LineSegment(new Point(0, 1), new Point(1, 0))) == Math.PI / 4 * 3, "angle should be pi/4*3");
sb.AppendLine("angle test 8");
That = new LineSegment(new Point(1, 1), new Point(0, 0));
Debug.Assert(This.Angle(That) > Math.PI / 4 - epsilon && This.Angle(That) < Math.PI / 4 + epsilon, "angle should be pi/4");
sb.AppendLine("angle test 9");
That = new LineSegment(new Point(0, 0), new Point(0, 0));
Debug.Assert(This.Angle(That) == 0, "angle should be 0");
//test JudgeIntersection
sb.AppendLine("----------------------------");
This = new LineSegment(new Point(2, 2), new Point(0, 2));
sb.AppendLine("intersection test 1");
That = new LineSegment(new Point(1, 2), new Point(0, 2));
Debug.Assert(This.JudgeIntersection(That) == false, "intersection should be false");
sb.AppendLine("intersection test 2");
That = new LineSegment(new Point(1, 1), new Point(0, 1));
Debug.Assert(This.JudgeIntersection(That) == false, "intersection should be false");
sb.AppendLine("intersection test 3");
That = new LineSegment(new Point(0, 1), new Point(1, 1));
Debug.Assert(This.JudgeIntersection(That) == false, "intersection should be false");
sb.AppendLine("intersection test 4");
That = new LineSegment(new Point(1, 0), new Point(1, 1));
Debug.Assert(This.JudgeIntersection(That) == false, "intersection should be false");
sb.AppendLine("intersection test 5");
That = new LineSegment(new Point(1, 1), new Point(1, 0));
Debug.Assert(This.JudgeIntersection(That) == false, "intersection should be false");
sb.AppendLine("intersection test 6");
That = new LineSegment(new Point(1, 1), new Point(0, 2));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 7");
That = new LineSegment(new Point(1, 1), new Point(2, 2));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 8");
That = new LineSegment(new Point(3, 1), new Point(2, 2));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 9");
That = new LineSegment(new Point(2, 1), new Point(1, 2));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 10");
That = new LineSegment(new Point(1, 2), new Point(2, 3));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 11");
That = new LineSegment(new Point(0, 0), new Point(2, 3));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 12");
That = new LineSegment(new Point(1, 0), new Point(0, 3));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 13");
That = new LineSegment(new Point(1, 3), new Point(1, 1));
Debug.Assert(This.JudgeIntersection(That) == true, "intersection should be true");
sb.AppendLine("intersection test 14");
That = new LineSegment(new Point(3, 2), new Point(2, 2));
Debug.Assert(This.JudgeIntersection(That) == false, "intersection should be false");
sb.AppendLine("intersection test 15");
That = new LineSegment(new Point(1, 2), new Point(1, 2));
Debug.Assert(This.JudgeIntersection(That) == false, "intersection should be false");
//test GetIntersectionPoint
sb.AppendLine("----------------------------");
This = new LineSegment(new Point(3, 2), new Point(1, 2));
sb.AppendLine("intersection point test 1");
That = new LineSegment(new Point(3, 1), new Point(1, 1));
Debug.Assert(This.GetIntersectionPoint(That) == null, "intersection point should be null");
sb.AppendLine("intersection point test 2");
That = new LineSegment(new Point(4, 1), new Point(3, 2));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(3, 2), "intersection point should be (3, 2)");
sb.AppendLine("intersection point test 3");
That = new LineSegment(new Point(3, 1), new Point(3, 2));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(3, 2), "intersection point should be (3, 2)");
sb.AppendLine("intersection point test 4");
That = new LineSegment(new Point(2, 1), new Point(3, 2));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(3, 2), "intersection point should be (3, 2)");
sb.AppendLine("intersection point test 5");
That = new LineSegment(new Point(3, 2), new Point(2, 3));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(3, 2), "intersection point should be (3, 2)");
sb.AppendLine("intersection point test 6");
That = new LineSegment(new Point(3, 2), new Point(4, 3));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(3, 2), "intersection point should be (3, 2)");
sb.AppendLine("intersection point test 7");
That = new LineSegment(new Point(2, 1), new Point(2, 3));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(2, 2), "intersection point should be (2, 2)");
sb.AppendLine("intersection point test 8");
That = new LineSegment(new Point(1, 1), new Point(3, 3));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(2, 2), "intersection point should be (2, 2)");
sb.AppendLine("intersection point test 9");
That = new LineSegment(new Point(3, 3), new Point(1, 1));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(2, 2), "intersection point should be (2, 2)");
sb.AppendLine("intersection point test 10");
That = new LineSegment(new Point(3, 1), new Point(1, 3));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(2, 2), "intersection point should be (2, 2)");
sb.AppendLine("intersection point test 11");
That = new LineSegment(new Point(1, 3), new Point(3, 1));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(2, 2), "intersection point should be (2, 2)");
sb.AppendLine("intersection point test 12");
That = new LineSegment(new Point(2, 3), new Point(0, 1));
Debug.Assert(This.GetIntersectionPoint(That) == new Point(1, 2), "intersection point should be (1, 2)");
sb.AppendLine("intersection point test 13");
That = new LineSegment(new Point(2, 2), new Point(2, 2));
Debug.Assert(This.GetIntersectionPoint(That) == null, "intersection point should be null");
test_log[time] = sb.ToString();
return test_log[time];
}