Source that is good for using as a glyph.

Graphics/vtkArrowSource.cxx

+/*=========================================================================
+
+  Program:   Visualization Toolkit
+  Module:    vtkArrowSource.cxx
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+
+Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+ * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
+   of any contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+ * Modified source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=========================================================================*/
+#include "vtkArrowSource.h"
+#include "vtkCylinderSource.h"
+#include "vtkConeSource.h"
+#include "vtkTransform.h"
+#include "vtkTransformFilter.h"
+#include "vtkAppendPolyData.h"
+#include "vtkObjectFactory.h"
+
+
+
+//------------------------------------------------------------------------------
+vtkArrowSource* vtkArrowSource::New()
+{
+  // First try to create the object from the vtkObjectFactory
+  vtkObject* ret = vtkObjectFactory::CreateInstance("vtkArrowSource");
+  if(ret)
+    {
+    return (vtkArrowSource*)ret;
+    }
+  // If the factory was unable to create the object, then create it here.
+  return new vtkArrowSource;
+}
+
+
+vtkArrowSource::vtkArrowSource()
+{
+  this->TipResolution = 6;
+  this->TipRadius = 0.1;
+  this->TipLength = 0.35;
+  this->ShaftResolution = 6;
+  this->ShaftRadius = 0.03;
+}
+
+
+void vtkArrowSource::Execute()
+{
+  int piece, numPieces, ghostLevel;
+  vtkPolyData *output = this->GetOutput();
+  vtkCylinderSource *cyl = vtkCylinderSource::New();
+  vtkTransform *trans0 = vtkTransform::New();
+  vtkTransformFilter *tf0 = vtkTransformFilter::New();
+  vtkConeSource *cone = vtkConeSource::New();
+  vtkTransform *trans1 = vtkTransform::New();
+  vtkTransformFilter *tf1 = vtkTransformFilter::New();
+  vtkAppendPolyData *append = vtkAppendPolyData::New();
+
+  piece = output->GetUpdatePiece();
+  numPieces = output->GetUpdateNumberOfPieces();
+  ghostLevel = output->GetUpdateGhostLevel();
+
+  cyl->SetResolution(this->ShaftResolution);
+  cyl->SetRadius(this->ShaftRadius);
+  cyl->SetHeight(1.0 - this->TipLength);
+  cyl->SetCenter(0, (1.0-this->TipLength)*0.5, 0.0);
+  cyl->CappingOn();
+
+  trans0->RotateZ(-90.0);
+  tf0->SetTransform(trans0);
+  tf0->SetInput(cyl->GetOutput());
+
+  cone->SetResolution(this->TipResolution);
+  cone->SetHeight(this->TipLength);
+  cone->SetRadius(this->TipRadius);
+
+  trans1->Translate(1.0-this->TipLength*0.5, 0.0, 0.0);
+  tf1->SetTransform(trans1);
+  tf1->SetInput(cone->GetOutput());
+
+  append->AddInput(tf0->GetPolyDataOutput());
+  append->AddInput(tf1->GetPolyDataOutput());
+
+  if (output->GetUpdatePiece() == 0)
+    {
+    append->Update();
+    output->ShallowCopy(append->GetOutput());
+    }
+  output->SetUpdatePiece(piece);
+  output->SetUpdateNumberOfPieces(numPieces);
+  output->SetUpdateGhostLevel(ghostLevel);
+
+  cone->Delete();
+  trans0->Delete();
+  tf0->Delete();
+  cyl->Delete();
+  trans1->Delete();
+  tf1->Delete();
+  append->Delete();  
+}
+
+
+void vtkArrowSource::PrintSelf(ostream& os, vtkIndent indent)
+{
+  vtkPolyDataSource::PrintSelf(os,indent);
+
+  os << indent << "TipResolution: " << this->TipResolution << "\n";
+  os << indent << "TipRadius: " << this->TipRadius << "\n";
+  os << indent << "TipLength: " << this->TipLength << "\n";
+
+  os << indent << "ShaftResolution: " << this->ShaftResolution << "\n";
+  os << indent << "ShaftRadius: " << this->ShaftRadius << "\n";
+}

Graphics/vtkArrowSource.h

+/*=========================================================================
+
+  Program:   Visualization Toolkit
+  Module:    vtkArrowSource.h
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+
+Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+ * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
+   of any contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+ * Modified source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=========================================================================*/
+// .NAME vtkArrowSource - Appends a cylinder/line to a cone to form an arrow.
+// .SECTION Description
+// vtkArrowSource was intended to be used as the source for a glyph.
+// The shaft base is always at (0,0,0). The arrow tip is always at (1,0,0).
+// The resolution of the cone and shaft can be set and default to 6.
+// The radius of the cone and shaft can be set and default to 0.03 and 0.1.
+// The length of the tip can also be set, and defaults to 0.35.
+
+
+#ifndef __vtkArrowSource_h
+#define __vtkArrowSource_h
+
+#include "vtkPolyDataSource.h"
+
+class VTK_EXPORT vtkArrowSource : public vtkPolyDataSource
+{
+public:
+  // Description
+  // Construct cone with angle of 45 degrees.
+  static vtkArrowSource *New();
+
+  vtkTypeMacro(vtkArrowSource,vtkPolyDataSource);
+  void PrintSelf(ostream& os, vtkIndent indent);
+    
+  // Description:
+  // Set the length, and radius of the tip.  They default to 0.35 and 0.1
+  vtkSetClampMacro(TipLength,float,0.0,1.0);
+  vtkGetMacro(TipLength,float);
+  vtkSetClampMacro(TipRadius,float,0.0,10.0);
+  vtkGetMacro(TipRadius,float);
+  
+  // Description:
+  // Set the resolution of the tip.  The tip behaves the same as a cone.
+  // Resoultion 1 gives a single triangle, 2 gives two crossed triangles.
+  vtkSetClampMacro(TipResolution,int,1,128);
+  vtkGetMacro(TipResolution,int);
+
+  // Description:
+  // Set the radius of the shaft.  Defaults to 0.03.
+  vtkSetClampMacro(ShaftRadius,float,0.0,5.0);
+  vtkGetMacro(ShaftRadius,float);
+
+  // Description:
+  // Set the resolution of the shaft.  0 gives a line, 1 gives a rectangle.
+  vtkSetClampMacro(ShaftResolution,int,0,128);
+  vtkGetMacro(ShaftResolution,int);
+
+protected:
+  vtkArrowSource();
+  ~vtkArrowSource() {};
+  vtkArrowSource(const vtkArrowSource&) {};
+  void operator=(const vtkArrowSource&) {};
+
+  void Execute();
+
+  int TipResolution;
+  float TipLength;
+  float TipRadius;
+
+  int ShaftResolution;
+  float ShaftRadius;
+
+};
+
+#endif
+
+