/// <summary>
/// Return a rotated bounding box around
/// the origin in the XY plane.
/// We cannot just rotate the min and max points,
/// because the rotated max point may easily end
/// up being 'smaller' in some coordinate than the
/// min. To work around that, we extract all four
/// bounding box corners, rotate each of them and
/// determine new min and max values from those.
/// </summary>
private static BoundingBoxXYZ RotateBoundingBox(
BoundingBoxXYZ b,
Transform t)
{
double height = b.Max.Z - b.Min.Z;
// Four corners: lower left, lower right,
// upper right, upper left:
XYZ[] corners = Util.GetCorners(b);
XyzComparable[] cornersTransformed
= corners.Select <XYZ, XyzComparable>(
p => new XyzComparable(t.OfPoint(p)))
.ToArray();
b.Min = cornersTransformed.Min();
b.Max = cornersTransformed.Max();
b.Max += height * XYZ.BasisZ;
return(b);
}
public Result Execute(
ExternalCommandData commandData,
ref string message,
ElementSet elements)
{
UIApplication app = commandData.Application;
UIDocument uidoc = app.ActiveUIDocument;
Document doc = uidoc.Document;
Element e = Util.SelectSingleElement(
uidoc, "an element");
if (null == e)
{
message = "No element selected";
return(Result.Failed);
}
// Trying to call this property returns the
// compile time error: Property, indexer, or
// event 'BoundingBox' is not supported by
// the language; try directly calling
// accessor method 'get_BoundingBox( View )'
//BoundingBoxXYZ b = e.BoundingBox[null];
View v = null;
BoundingBoxXYZ b = e.get_BoundingBox(v);
if (null == b)
{
v = commandData.View;
b = e.get_BoundingBox(v);
}
if (null == b)
{
Util.InfoMsg(
Util.ElementDescription(e)
+ " has no bounding box.");
}
else
{
using (Transaction tx = new Transaction(doc))
{
tx.Start("Draw Model Line Bounding Box Outline");
Debug.Assert(b.Transform.IsIdentity,
"expected identity bounding box transform");
string in_view = (null == v)
? "model space"
: "view " + v.Name;
Util.InfoMsg(string.Format(
"Element bounding box of {0} in "
+ "{1} extends from {2} to {3}.",
Util.ElementDescription(e),
in_view,
Util.PointString(b.Min),
Util.PointString(b.Max)));
Creator creator = new Creator(doc);
creator.DrawPolygon(new List <XYZ>(
Util.GetCorners(b)));
Transform rotation = Transform.CreateRotation(
XYZ.BasisZ, 60 * Math.PI / 180.0);
b = RotateBoundingBox(b, rotation);
Util.InfoMsg(string.Format(
"Bounding box rotated by 60 degrees "
+ "extends from {0} to {1}.",
Util.PointString(b.Min),
Util.PointString(b.Max)));
creator.DrawPolygon(new List <XYZ>(
Util.GetCorners(b)));
tx.Commit();
}
}
return(Result.Succeeded);
}
