internal static IPolygon2D ConvertTo2D(Polygon3D polygon3D, IMatrix44 lcs)
{
var pts = polygon3D.Select(pt =>
{
var p = lcs.TransformToLCS(pt);
return(new Point(p.X, p.Y));
});
return(new Polygon2D(pts));
}
/// <summary>
/// Calculate relative position of point on polyline.
/// </summary>
/// <param name="region">region</param>
/// <param name="point">Point</param>
/// <param name="relativeX">Relative Position along local X axis</param>
/// <param name="relativeY">Relative Position along local Y axis</param>
/// <param name="toleranceLevel">Tolerance Level</param>
/// <returns>True if point exist in polyline</returns>
public static bool GetRelativePosition(IRegion3D region, IPoint3D point, ref double relativeX, ref double relativeY, double toleranceLevel = MathConstants.ZeroWeak)
{
IMatrix44 matrix = GeomOperation.GetMatrixPlane(region);
IPoint3D pointInLCS = matrix.TransformToLCS(point);
if (pointInLCS.Z.IsZero() == false)
{
return(false);
}
relativeX = pointInLCS.X;
relativeY = pointInLCS.Y;
return(true);
}
/// <summary>
/// Prepaer a point on region from given region and point.
/// </summary>
/// <param name="matrix">LCS matrix of baseGeometry</param>
/// <param name="baseGeometry">IRegion3D</param>
/// <param name="point">IPoint3D</param>
/// <returns>New IPointOnRegion object</returns>
public static IPointOnRegion GetPointOnRegion(IMatrix44 matrix, IRegion3D baseGeometry, IPoint3D point)
{
if (baseGeometry == null || point == null)
{
return(null);
}
if (matrix == null)
{
matrix = GetMatrixPlane(baseGeometry);
}
IPoint3D pointInLCS = matrix.TransformToLCS(point);
if (pointInLCS.Z.IsZero() == false)
{
throw new NotSupportedException("Screen point and selected region are not in same plane");
}
IPointOnRegion pointOnRegion = new PointOnRegion(baseGeometry, pointInLCS.X, pointInLCS.Y);
return(pointOnRegion);
}
