internal CoordinateSystem GetCSAtParameters(double u, double v)
{
bool uchange = GeometryExtension.ClipParamRange(ref u);
bool vchange = GeometryExtension.ClipParamRange(ref v);
// TO DO - throw a warning each time a condition above is satisfied.
//throw new System.ArgumentException(string.Format(Properties.Resources.InvalidInput, "u or v parameter", "Surface.PointAtUVParameters"));
IPointEntity pos = SurfaceEntity.PointAtParameter(u, v);
Point origin = pos.ToPoint(false, null);
Vector xAxis = new Vector(SurfaceEntity.TangentAtUParameter(u, v));
Vector yAxis = new Vector(SurfaceEntity.TangentAtVParameter(u, v));
Vector zAxis = xAxis.Cross(yAxis);
return(CoordinateSystem.ByOriginVectors(origin, xAxis, yAxis, zAxis, false, true, false));
}
/// <summary>
///
/// </summary>
/// <param name="u"></param>
/// <param name="v"></param>
/// <param name="offset"></param>
/// <returns></returns>
internal Point PointAtParametersCore(ref double u, ref double v, double offset)
{
bool uchange = GeometryExtension.ClipParamRange(ref u);
bool vchange = GeometryExtension.ClipParamRange(ref v);
// TO DO - throw a warning each time a condition above is satisfied.
//throw new System.ArgumentException(string.Format(Properties.Resources.InvalidInput, "u or v parameter", "Surface.PointAtParameters"));
IPointEntity pt = SurfaceEntity.PointAtParameter(u, v);
if (!offset.EqualsTo(0.0))
{
Vector normal = new Vector(SurfaceEntity.NormalAtPoint(pt));
Vector translation = normal.Normalize().Scale(offset);
IPointEntity offsetPt = pt.Add(translation);
pt.Dispose();
pt = offsetPt;
}
return(pt.ToPoint(true, this));
}
