/// <summary>
/// Calculates the area of an object
/// </summary>
public static double GetArea(IRhinoObject obj, double tol)
{
if (null != obj)
{
IOnCurve crv = OnCurve.ConstCast(obj.Geometry());
if (null != crv)
{
return(GetCurveArea(crv, tol));
}
IOnSurface srf = OnSurface.ConstCast(obj.Geometry());
if (null != srf)
{
return(GetSurfaceArea(srf));
}
IOnBrep brep = OnBrep.ConstCast(obj.Geometry());
if (null != brep)
{
return(GetBrepArea(brep));
}
IOnMesh mesh = OnMesh.ConstCast(obj.Geometry());
if (null != mesh)
{
return(GetMeshArea(mesh));
}
}
return(0.0);
}
/// <summary>
/// Calculates the length of an object
/// </summary>
public static double GetLength(IRhinoObject obj)
{
double length = 0.0;
if (null != obj)
{
IOnCurve crv = OnCurve.ConstCast(obj.Geometry());
if (null != crv)
{
crv.GetLength(ref length);
}
}
return(length);
}
public override bool CustomGeometryFilter(IRhinoObject obj, IOnGeometry geo, OnCOMPONENT_INDEX ci)
{
if (geo != null)
{
IOnCurve crv = OnCurve.ConstCast(geo);
if (crv != null)
{
if (crv.IsClosed() && crv.IsPlanar())
{
return(true);
}
else
{
return(false);
}
}
IOnBrep brep = OnBrep.ConstCast(geo);
if (brep != null)
{
if (brep.m_F.Count() == 1)
{
return(true);
}
else
{
return(false);
}
}
IOnSurface srf = OnSurface.ConstCast(geo);
if (srf != null)
{
return(true);
}
IOnMesh mesh = OnMesh.ConstCast(geo);
if (mesh != null)
{
return(true);
}
}
return(false);
}
private static double GetCurveArea(IOnCurve crv, double tol)
{
double area = 0.0;
if (null != crv && crv.IsClosed())
{
OnPlane plane = new OnPlane();
if (crv.IsPlanar(plane, tol))
{
OnBoundingBox bbox = crv.BoundingBox();
On3dPoint point = plane.ClosestPointTo(bbox.Center());
OnMassProperties mp = new OnMassProperties();
if (crv.AreaMassProperties(point, plane.Normal(), ref mp))
{
area = Math.Abs(mp.Area());
}
}
}
return(area);
}
///<summary> This gets called when when the user runs this command.</summary>
public override IRhinoCommand.result RunCommand(IRhinoCommandContext context)
{
MRhinoGetObject go = new MRhinoGetObject();
go.SetCommandPrompt("Select curve");
go.SetGeometryFilter(IRhinoGetObject.GEOMETRY_TYPE_FILTER.curve_object);
go.EnableSubObjectSelect(false);
go.GetObjects(1, 1);
if (go.CommandResult() != IRhinoCommand.result.success)
{
return(go.CommandResult());
}
IOnCurve curve = go.Object(0).Curve();
if (null == curve)
{
return(IRhinoCommand.result.failure);
}
// Several types of OnCurve objects can have the form of a polyline,
// including OnLineCurve, a degree 1 OnNurbsCurve, ON_PolylineCurve,
// and ON_PolyCurve (whose segments form a polyline). OnCurve.IsPolyline
// tests a curve to see if it can be represented as a polyline.
ArrayOn3dPoint points = new ArrayOn3dPoint(64);
int point_count = curve.IsPolyline(points);
if (point_count > 0)
{
string point_str = string.Empty;
for (int i = 0; i < point_count; i++)
{
point_str = string.Empty;
RhUtil.RhinoFormatPoint(points[i], ref point_str);
RhUtil.RhinoApp().Print(string.Format("Point {0} = {1}\n", i, point_str));
}
}
return(IRhinoCommand.result.success);
}
/// <summary>
/// This gets called when when the user runs this command.
/// </summary>
public override IRhinoCommand.result RunCommand(IRhinoCommandContext context)
{
// Select objects to animate
MRhinoGetObject go = new MRhinoGetObject();
go.SetCommandPrompt("Select objects to animate");
go.GetObjects(1, 0);
if (go.CommandResult() != IRhinoCommand.result.success)
{
return(go.CommandResult());
}
// Select path curve
MRhinoGetObject gc = new MRhinoGetObject();
gc.SetCommandPrompt("Select path curve");
gc.SetGeometryFilter(IRhinoGetObject.GEOMETRY_TYPE_FILTER.curve_object);
gc.SetGeometryAttributeFilter(IRhinoGetObject.GEOMETRY_ATTRIBUTE_FILTER.open_curve);
gc.EnableDeselectAllBeforePostSelect(false);
gc.GetObjects(1, 1);
if (gc.CommandResult() != IRhinoCommand.result.success)
{
return(gc.CommandResult());
}
// Get the curve
IOnCurve crv = gc.Object(0).Curve();
if (null == crv)
{
return(IRhinoCommand.result.failure);
}
// Create an array of normalized curve parameters
List <double> slist = new List <double>(m_max_steps);
for (int i = 0; i < m_max_steps; i++)
{
double s = (double)i / ((double)m_max_steps - 1);
slist.Add(s);
}
// Get the real parameters along the curve
double[] tlist = new double[m_max_steps];
if (!crv.GetNormalizedArcLengthPoints(slist.ToArray(), ref tlist))
{
return(IRhinoCommand.result.failure);
}
// Create the display conduit
SampleCsAnimatorConduit conduit = new SampleCsAnimatorConduit();
// Get points along curve
On3dPoint start = new On3dPoint(crv.PointAtStart());
List <On3dPoint> plist = new List <On3dPoint>(tlist.Length);
for (int i = 0; i < m_max_steps; i++)
{
On3dPoint pt = new On3dPoint(crv.PointAt(tlist[i]));
plist.Add(pt);
}
// Hide objects and add them to conduit's object array
for (int i = 0; i < go.ObjectCount(); i++)
{
MRhinoObjRef objref = go.Object(i);
context.m_doc.HideObject(objref);
conduit.m_objects.Add(objref.Object());
}
// Do animation...
conduit.Enable();
for (int i = 0; i < m_max_steps; i++)
{
On3dVector v = plist[i] - start;
conduit.m_xform.Translation(v);
context.m_doc.Redraw();
Thread.Sleep(100);
}
for (int i = m_max_steps - 1; i >= 0; i--)
{
On3dVector v = plist[i] - start;
conduit.m_xform.Translation(v);
if (0 != i)
{
context.m_doc.Redraw();
Thread.Sleep(100);
}
}
conduit.Disable();
// Show hidden objects
for (int i = 0; i < go.ObjectCount(); i++)
{
MRhinoObjRef objref = go.Object(i);
context.m_doc.ShowObject(objref);
}
context.m_doc.Redraw();
return(IRhinoCommand.result.success);
}
private static double GetCurveArea(IOnCurve crv, double tol)
{
double area = 0.0;
if (null != crv && crv.IsClosed())
{
OnPlane plane = new OnPlane();
if (crv.IsPlanar(plane, tol))
{
OnBoundingBox bbox = crv.BoundingBox();
On3dPoint point = plane.ClosestPointTo(bbox.Center());
OnMassProperties mp = new OnMassProperties();
if (crv.AreaMassProperties(point, plane.Normal(), ref mp))
area = Math.Abs(mp.Area());
}
}
return area;
}
