/// <summary>
/// compute the length of side 2 from length of side 1, angle of side 1 and angle of
/// side 2.
/// </summary>
/// <param name="Side1"></param>
/// <param name="Vertex1"></param>
/// <param name="Vertex2"></param>
/// <returns></returns>
public static double CalcSideFromAngleAngleSide(
double Side1, Angle360 Vertex1, Angle360 Vertex2)
{
// formula: (sin vertex1)/side1 = (sin vertex2)/side2
// side2 * ((sin vertex1)/side1) = (sin vertex2)
// side2 = (sin vertex2) / ((sin vertex1)/side1)
var side2 = Vertex2.Radians.Sine / (Vertex1.Radians.Sine / Side1);
return(side2);
}
/// <summary>
/// compute the length of side 3 from the angle of side 3 and the length of side 1
/// and length of side 2.
/// </summary>
/// <param name="Side1Lgth"></param>
/// <param name="Side2Lgth"></param>
/// <param name="Vertex3Angle"></param>
/// <returns></returns>
public static double CalcSideFromSideSideAngle(
double Side1, double Side2, Angle360 Vertex3)
{
// formula:
// side3 * side3 = (side1 * side1) + (side2 * side2) -
// (( 2 * side1 * side2 ) * cosine angle3)
var cos3 = Vertex3.Radians.Cos.Value;
var side3 = Math.Sqrt((Side1 * Side1) + (Side2 * Side2) -
((2 * Side1 * Side2) * cos3));
return(side3);
}
/// <summary>
/// compute the angle between two lines.
/// </summary>
/// <param name="Line1"></param>
/// <param name="Line2"></param>
/// <returns></returns>
public static double AngleBetween(LineCoordinates Line1, LineCoordinates Line2)
{
// the start point of each line is the common point between the two lines.
var commonPoint = LineCoordinates.CommonEndPoint(Line1, Line2);
// the end points of each line.
var end1 = Line1.OtherPoint(commonPoint);
var end2 = Line2.OtherPoint(commonPoint);
// the 360 degree angles of each line.
var angle1 = LineExt.GetAngle(commonPoint, end1);
var angle2 = LineExt.GetAngle(commonPoint, end2);
// the angle between is the diff between the 360 degree angles of the 2 lines.
var angleBet = Angle360.Subtract(angle1, angle2);
if (angleBet.Value > 180)
{
angleBet = Angle360.Subtract(angle2, angle1);
}
return(angleBet.Value);
}
