CRhinoCommand::result CCommandSampleTriangulatePolygon::RunCommand( const CRhinoCommandContext& context )
{
CRhinoGetObject go;
go.SetCommandPrompt( L"Select closed planar polygon to triangulate" );
go.SetGeometryFilter( CRhinoGetObject::curve_object );
go.SetGeometryFilter( CRhinoGetObject::closed_curve );
go.EnableSubObjectSelect( FALSE );
go.GetObjects( 1, 1 );
if( go.CommandResult() != CRhinoCommand::success )
return go.CommandResult();
const CRhinoObjRef& ref = go.Object(0);
ON_3dPointArray vertices;
const ON_PolylineCurve* pc = ON_PolylineCurve::Cast( ref.Curve() );
if( pc )
{
vertices = pc->m_pline;
}
else
{
const ON_NurbsCurve* nc = ON_NurbsCurve::Cast( ref.Curve() );
if( nc )
nc->IsPolyline( &vertices );
}
if( vertices.Count() < 5 )
{
RhinoApp().Print( L"Curve not polygon with at least four sides.\n" );
return CRhinoCommand::nothing;
}
int* triangles = (int*)onmalloc( (vertices.Count()-3) * sizeof(int) * 3 );
if( 0 == triangles )
return CRhinoCommand::failure; // out of memory
memset( triangles, 0, (vertices.Count()-3) * sizeof(int) * 3 );
int rc = RhinoTriangulate3dPolygon( vertices.Count()-1, 3, (const double*)vertices.Array(), 3, triangles);
if( 0 == rc )
{
int i;
for( i = 0; i < vertices.Count()-3; i++ )
{
ON_Polyline pline;
pline.Append( vertices[triangles[i * 3]] );
pline.Append( vertices[triangles[i * 3 + 1]] );
pline.Append( vertices[triangles[i * 3 + 2]] );
pline.Append( pline[0] );
context.m_doc.AddCurveObject( pline );
}
context.m_doc.Redraw();
}
onfree( triangles );
return CRhinoCommand::success;
}
void CGetPolylinePoints::DynamicDraw( HDC hdc, CRhinoViewport& vp, const ON_3dPoint& pt )
{
if( m_point_array.Count() > 0 )
{
int i;
for( i = 1; i < m_point_array.Count(); i++ )
{
vp.DrawPoint( m_point_array[i-1] );
vp.DrawLine( m_point_array[i-1], m_point_array[i] );
}
vp.DrawPoint( m_point_array[i-1] );
vp.DrawPoint( pt );
vp.DrawLine( m_point_array[i-1], pt );
}
CRhinoGetPoint::DynamicDraw( hdc, vp, pt);
}
int CGetPolylinePoints::GetPoints()
{
m_point_array.Empty();
SetCommandPrompt( L"Start of polyline" );
AcceptNothing();
CRhinoGet::result res = GetPoint();
if( res == CRhinoGet::point )
{
m_point_array.Append( Point() );
SetCommandPrompt( L"Next point of polyline" );
for( ;; )
{
SetBasePoint( Point() );
res = GetPoint();
if( res == CRhinoGet::point )
{
ON_3dPoint pt = Point();
if( pt.DistanceTo(m_point_array[m_point_array.Count()-1]) > ON_ZERO_TOLERANCE )
m_point_array.Append( Point() );
continue;
}
if( res == CRhinoGet::nothing )
break;
return 0;
}
}
return m_point_array.Count();
}
void ON_TextLog::Print( const ON_3dPointArray& a, const char* sPreamble )
{
const double* p = (a.Array() ? &a.Array()[0].x : NULL );
PrintPointList( 3, false, a.Count(), 3, p, sPreamble );
}