/// <summary>
/// Extend a line the specified distance in either/both directions
/// <para>This method is immutable</para>
/// </summary>
/// <param name="bottomLeftExtension">The amount to extend the logical bottom left length of the line</param>
/// <param name="topRightExtension">The amount to extend the logical top right length of the line</param>
/// <returns>A new line with the extensions added as required</returns>
public Line2D <T> Extend(T bottomLeftExtension, T topRightExtension)
{
Point2D <T> p1 = Ends[0];
Point2D <T> p2 = Ends[1];
T adj = (dynamic)p2.X - p1.X;
T opp = (dynamic)p2.Y - p1.Y;
double divisor = (double)(dynamic)opp / (double)(dynamic)adj;
double atan = Math.Atan(divisor);
double angle = MathsUtils.ToDegrees(atan);
if ((dynamic)opp == 0)
{
if ((dynamic)p1.X > p2.X)
{
angle = 180;
}
}
if ((dynamic)adj == 0)
{
if ((dynamic)p1.Y > p2.Y)
{
angle = 270;
}
}
if ((dynamic)topRightExtension != 0)
{
p2 = p2.LocatePointAtDistance(angle, topRightExtension);
}
if ((dynamic)bottomLeftExtension != 0)
{
p1 = p1.LocatePointAtDistance(angle + 180, bottomLeftExtension);
}
return(new Line2D <T>(p1, p2));
}
