import vtk.*;
public class ExtrudeTest {
/**
* @param args
*/
// load the necessary interface libraries on first reference to the
// class.
static {
System.loadLibrary("vtkCommonJava");
System.loadLibrary("vtkFilteringJava");
System.loadLibrary("vtkIOJava");
System.loadLibrary("vtkGeovisJava");
System.loadLibrary("vtkImagingJava");
System.loadLibrary("vtkGraphicsJava");
System.loadLibrary("vtkRenderingJava");
System.loadLibrary("vtkWidgetsJava");
}
/*
* Instance variable of RenderWindowIneractor for reference by addObserver Callback.
*/
vtkRenderWindowInteractor iren = null;
/*
* TrackballActor style interactor for addObserver callback reference
*/
vtkInteractorStyleTrackballActor astyle = new vtkInteractorStyleTrackballActor();
/*
* TrackballCamera style interactor for addObserver callback reference
*/
vtkInteractorStyleTrackballCamera cstyle = new vtkInteractorStyleTrackballCamera();
/*
* Interactor state for addObserver callback reference.
*/
char curIStyle = 'A'; // interaction style A = Actor C = camera,
// toggled by 'C' key handler.
/*
* Main routine to invoke example.
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ExtrudeTest me = new ExtrudeTest();
me.doit();
}
/*
* toggleStyle is a callback set on the renderWindowInteractor
* for the CharEvent using AddObserver. It expects the this pointer
* for the class and refers to the iren, curIStyle, cstyle and astyle
* attributes. it toggles the interaction between TrackballActor and
* TrackballCamera when the 'c' key is pressed.
*/
void toggleStyle() {
if (iren.GetKeyCode() == 'c' | iren.GetKeyCode() == 'C') {
if (curIStyle == 'A') {
curIStyle = 'C';
iren.SetInteractorStyle(cstyle);
} else {
curIStyle = 'A';
iren.SetInteractorStyle(astyle);
}
}
}
/*
* the doit() method constructs the extrusion profiles,
* builds the extruded objects,
* creates the mappers and actors, renderWindow and Interactor.
* and specifies the CharEvent callback for the interaction control.
*/
void doit () {
vtkPoints W21x101 = new vtkPoints();
vtkCellArray lineArray = new vtkCellArray(); //declare the storage for the points
vtkCellArray rotArray = new vtkCellArray(); //declare the storage for the points
/*
* Point data for the profile objects for extrusion
*/
W21x101.InsertPoint( 0, 6.145, 10.68, 0.0);
W21x101.InsertPoint( 1, -6.145, 10.68, 0.0);
W21x101.InsertPoint( 2, -6.145, 9.88, 0.0);
W21x101.InsertPoint( 3, -0.44, 9.88, 0.0);
W21x101.InsertPoint( 4, -0.44, -9.88, 0.0);
W21x101.InsertPoint( 5, -6.145, -9.88, 0.0);
W21x101.InsertPoint( 6, -6.145, -10.68, 0.0);
W21x101.InsertPoint( 7, 6.145, -10.68, 0.0);
W21x101.InsertPoint( 8, 6.145, -9.88, 0.0);
W21x101.InsertPoint( 9, 0.44, -9.88, 0.0);
W21x101.InsertPoint( 10, 0.44, 9.88, 0.0);
W21x101.InsertPoint( 11, 6.145, 9.88, 0.0);
W21x101.InsertPoint( 12, -0.44, 10.68, 0.0);
W21x101.InsertPoint( 13, -0.44, -10.68, 0.0);
W21x101.InsertPoint( 14, 0.44, 10.68, 0.0);
W21x101.InsertPoint( 15, 0.44, -10.68, 0.0);
/*
* alternative rectangles for rotation extrusion filter parallel to z axis
* do not show artifacts in shape and end planes.
*/
W21x101.InsertPoint(16,0,10.68,6.145);
W21x101.InsertPoint(17,0,10.68,-6.145);
W21x101.InsertPoint(18,0,9.88,-6.145);
W21x101.InsertPoint(19,0,9.88,-0.44);
W21x101.InsertPoint(20,0,-9.88,-0.44);
W21x101.InsertPoint(21,0,-9.88,-6.145);
W21x101.InsertPoint(22,0,-10.68,-6.145);
W21x101.InsertPoint(23,0,-10.68,6.145);
W21x101.InsertPoint(24,0,-9.88,6.145);
W21x101.InsertPoint(25,0,-9.88,0.44);
W21x101.InsertPoint(26,0,9.88,0.44);
W21x101.InsertPoint(27,0,9.88,6.145);
W21x101.InsertPoint(28,0,10.68,-0.44);
W21x101.InsertPoint(29,0,-10.68,-0.44);
W21x101.InsertPoint(30,0,10.68,0.44);
W21x101.InsertPoint(31,0,-10.68,0.44);
/*
* The following two rotArray cells define equal size rectangles
* the first uses 8 points, the second uses 4 points.
* Even though these two profiles look visually identical at the start
* end when the rotational extrusion filter has a non zero value for
* DeltaRadius the rectangle defined with 8 points becomes a truncated
* wedge shape and shows an endplane capping artifact as well.
* The 4 point rectangle remains rectangular.
* I did not expect adding more points on the polygon to change to
* shape extruded.
*/
rotArray.InsertNextCell(9);
rotArray.InsertCellPoint( 0);
rotArray.InsertCellPoint(14);
rotArray.InsertCellPoint(12);
rotArray.InsertCellPoint( 1);
rotArray.InsertCellPoint( 2);
rotArray.InsertCellPoint(3);
rotArray.InsertCellPoint(10);
rotArray.InsertCellPoint( 11);
rotArray.InsertCellPoint( 0);
rotArray.InsertNextCell(5);
rotArray.InsertCellPoint( 5);
rotArray.InsertCellPoint( 6);
rotArray.InsertCellPoint( 7);
rotArray.InsertCellPoint( 8);
rotArray.InsertCellPoint( 5);
/*
* alternative rotArray profile that does not have artifacts in extrusion:
rotArray.InsertNextCell(9);
rotArray.InsertCellPoint( 16);
rotArray.InsertCellPoint(30);
rotArray.InsertCellPoint(28);
rotArray.InsertCellPoint( 17);
rotArray.InsertCellPoint( 18);
rotArray.InsertCellPoint(19);
rotArray.InsertCellPoint(26);
rotArray.InsertCellPoint( 27);
rotArray.InsertCellPoint( 16);
rotArray.InsertNextCell(5);
rotArray.InsertCellPoint( 21);
rotArray.InsertCellPoint( 22);
rotArray.InsertCellPoint( 23);
rotArray.InsertCellPoint( 24);
rotArray.InsertCellPoint( 21);
*/
/*
* The following definition of the I beam does not create
* end plane artifacts when CappingOn() is set by the extrusion filter.
*/
lineArray.InsertNextCell(5);
lineArray.InsertCellPoint( 0);
lineArray.InsertCellPoint( 1);
lineArray.InsertCellPoint( 2);
lineArray.InsertCellPoint( 11);
lineArray.InsertCellPoint( 0);
lineArray.InsertNextCell(5);
lineArray.InsertCellPoint( 3);
lineArray.InsertCellPoint( 4);
lineArray.InsertCellPoint( 9);
lineArray.InsertCellPoint( 10);
lineArray.InsertCellPoint( 3);
lineArray.InsertNextCell(5);
lineArray.InsertCellPoint( 5);
lineArray.InsertCellPoint( 6);
lineArray.InsertCellPoint( 7);
lineArray.InsertCellPoint( 8);
lineArray.InsertCellPoint( 5);
/*
* The following polygon profile creates endplane artifacts
* when CappingOn() is set for the extrusion filter.
*/
/*
lineArray.InsertNextCell(13); //set the size of data to hold
lineArray.InsertCellPoint( 0);
lineArray.InsertCellPoint( 1);
lineArray.InsertCellPoint( 2);
lineArray.InsertCellPoint( 3);
lineArray.InsertCellPoint( 4);
lineArray.InsertCellPoint( 5);
lineArray.InsertCellPoint( 6);
lineArray.InsertCellPoint( 7);
lineArray.InsertCellPoint( 8);
lineArray.InsertCellPoint( 9);
lineArray.InsertCellPoint(10);
lineArray.InsertCellPoint(11);
lineArray.InsertCellPoint( 0);
*/
//create the holding structure for the lineProfile
vtkPolyData LineProfile = new vtkPolyData();
LineProfile.SetPoints(W21x101);
LineProfile.SetPolys(lineArray);
//create the holding structure for the rotProfile
vtkPolyData rotProfile = new vtkPolyData();
rotProfile.SetPoints(W21x101);
rotProfile.SetPolys(rotArray);
//create the rotational extrusion mechanism to extrude the rotProfile
vtkRotationalExtrusionFilter rotExtrusion = new vtkRotationalExtrusionFilter();
rotExtrusion.SetResolution(120);
rotExtrusion.SetTranslation(120);
rotExtrusion.SetDeltaRadius(20.0);
rotExtrusion.SetAngle(720.0);
rotExtrusion.CappingOn();
rotExtrusion.SetInput(rotProfile);
vtkPolyDataMapper rotMapper = new vtkPolyDataMapper();
rotMapper.SetInput(rotExtrusion.GetOutput());
// Create an actor to represent the line. The actor orchestrates
// rendering of
// the mapper's graphics primitives. An actor also refers to properties
// via a
// vtkProperty instance, and includes an internal transformation matrix.
// We
// set this actor's mapper to be lineMapper which we created above.
vtkActor rotActor = new vtkActor();
rotActor.SetMapper(rotMapper);
//create the linear extrusion mechanism to extrude the profile
vtkLinearExtrusionFilter Extrusion = new vtkLinearExtrusionFilter();
Extrusion.SetExtrusionTypeToVectorExtrusion();
Extrusion.SetVector(0.0, 0.0, 120.0);
Extrusion.CappingOn();
Extrusion.SetInput(LineProfile);
vtkPolyDataMapper lineMapper = new vtkPolyDataMapper();
lineMapper.SetInput(Extrusion.GetOutput());
// Create an actor to represent the line. The actor orchestrates
// rendering of
// the mapper's graphics primitives. An actor also refers to properties
// via a
// vtkProperty instance, and includes an internal transformation matrix.
// We
// set this actor's mapper to be lineMapper which we created above.
vtkActor lineActor = new vtkActor();
lineActor.SetMapper(lineMapper);
// Create the Renderer and assign actors to it. A renderer is like a
// viewport. It is part or all of a window on the screen and it is
// responsible for drawing the actors it has. We also set the
// background color here.
vtkRenderer ren1 = new vtkRenderer();
ren1.AddActor(lineActor);
ren1.AddActor(rotActor);
ren1.SetBackground(0.1, 0.2, 0.4);
// Finally we create the render window which will show up on the screen
// We put our renderer into the render window using AddRenderer. We
// also set the size to be 300 pixels by 300.
vtkRenderWindow renWin = new vtkRenderWindow();
renWin.AddRenderer(ren1);
renWin.SetSize(600, 600);
// The vtkRenderWindowInteractor class watches for events (e.g.,
// keypress,
// mouse) in the vtkRenderWindow. These events are translated into
// event invocations that VTK understands (see VTK/Common/vtkCommand.h
// for all events that VTK processes). Then observers of these VTK
// events can process them as appropriate.
iren = new vtkRenderWindowInteractor();
iren.SetRenderWindow(renWin);
// By default the vtkRenderWindowInteractor instantiates an instance
// of vtkInteractorStyle. vtkInteractorStyle translates a set of events
// it observes into operations on the camera, actors, and/or properties
// in the vtkRenderWindow associated with the vtkRenderWinodwInteractor.
// Here we specify a particular interactor style.
curIStyle = 'C';
iren.SetInteractorStyle(cstyle);
// add observer for key event:
iren.AddObserver("CharEvent", this, "toggleStyle");
// Start the event loop.
iren.Initialize();
iren.Start();
}
}
