/// <summary>
/// Constructs a line passing through <paramref name="location"/> with the provided <paramref name="direction"/> clipped by the
/// rectangle <paramref name="clippedBy"/>
/// </summary>
/// <param name="location">Point on the (extension of the) line </param>
/// <param name="direction">Direction of the line</param>
/// <param name="clippedBy">Clipping rectangle</param>
public Line2D(GeoPoint2D location, GeoVector2D direction, BoundingRect clippedBy)
{
direction.Norm(); // ist ja ne Kopie
// das geht aber eleganter, oder?
GeoPoint2D c = Geometry.DropPL(clippedBy.GetCenter(), location, direction);
double l = clippedBy.Width + clippedBy.Height;
startPoint = c + l * direction;
endPoint = c - l * direction;
ClipRect clr = new ClipRect(ref clippedBy);
clr.ClipLine(ref startPoint, ref endPoint);
}
public override ICurve2D[] GetTangentCurves(GeoVector direction, double umin, double umax, double vmin, double vmax)
{
if (Precision.SameDirection(direction, zAxis, false))
{
return(new ICurve2D[0]);
}
GeoPoint2D uv = PositionOf(location + zAxis + (direction ^ zAxis));
GeoVector2D dir2d = uv.ToVector();
dir2d.Length = Math.Max(Math.Max(Math.Abs(umax), Math.Abs(umin)), Math.Max(Math.Abs(vmax), Math.Abs(vmin))) * 1.1;
ClipRect clr = new ClipRect(umin, umax, vmin, vmax);
GeoPoint2D sp = GeoPoint2D.Origin - dir2d;
GeoPoint2D ep = GeoPoint2D.Origin + dir2d;
if (clr.ClipLine(ref sp, ref ep))
{
return new ICurve2D[] { new Line2D(sp, ep) }
}
;
else
{
return(new ICurve2D[0]);
}
}