public WPoint2D IntersectWith(WLine2D other)
{
if (this.IsParallelTo(other))
{
return(null);
}
WPoint2D p = this.StartPoint;
WPoint2D q = other.StartPoint;
WVector2D r = this.StartPoint.VectorTo(this.EndPoint);
WVector2D s = other.StartPoint.VectorTo(other.EndPoint);
double t = (q - p).CrossProduct(s) / (r.CrossProduct(s));
return(p + t * r);
}
/// 判断该线是否与另一条线在一定的角度公差范围内平行
/// Checks to determine whether or not two lines are parallel to each other within a specified angle tolerance
/// </summary>
/// <param name="other">The other line to check this one against</param>
/// <param name="angleTolerance">If the angle between line directions is less than this value, the method returns true</param>
/// <returns>True if the lines are parallel within the angle tolerance, false if they are not</returns>
public bool IsParallelTo(WLine2D other, Angle angleTolerance)
{
return(this.Direction.IsParallelTo(other.Direction, angleTolerance));
}
/// 判断该线是否与另一条线平行
/// Checks to determine whether or not two lines are parallel to each other, using the dot product within
/// the double precision specified in the MathNet.Numerics package.
/// </summary>
/// <param name="other">The other line to check this one against</param>
/// <returns>True if the lines are parallel, false if they are not</returns>
public bool IsParallelTo(WLine2D other)
{
return(this.Direction.IsParallelTo(other.Direction, WGeos2D_Paras.E_Angle));
}
