[vtkusers] Re: Re: Drawing a simple line graph (CONTINUES...)

[Isidro Moreno]

You may mean ".... instead of  1.0 1.0 0.0", do you? If yes, I answer: yes, 
i've tried and work OK, but I'm altering the cell's geometry. I'm using a 
similar code to draw a curve line, and that was the solution I've found at 
the moment: filtering the geometry data to normalized viewport values. But 
it would be easier if GetPosition2Coordinate worked! In fact, it works OK 
with vtkActor2D classes that are below it in the hierarchical tree. There's 
could be a bug...


> Hi Isidro,
>
> Have you tried setting your second point to 0.5, 0.5, 0 instead of 1.0, 
> 1.0, 1.0?
>
> - Amy
>
> Isidro Moreno wrote:
>>  Hi! I think this method _definitely doesn't work_: 
>> vtkActor2D->GetPosition2Coordinate->SetValue(x,y,z).
>>  This is my code (a simple straight line):
>>  /*This should draw a diagonal in the left-bottom quarter of the window, 
>> but the diagonal crosses the whole screen. If the commented lines below 
>> are enabled, the behaviour it's the same*/
>>  #include "vtkActor2D.h"
>> #include "vtkRenderWindow.h"
>> #include "vtkRenderer.h"
>> #include "vtkRenderWindowInteractor.h"
>> #include "vtkPolyDataMapper2D.h"
>> #include "vtkProperty2D.h"
>> #include "vtkPolyData.h"
>> #include "vtkPoints.h"
>> #include "vtkCellArray.h"
>> #include "vtkCamera.h"
>>  int main(int argc, char *argv[]){
>>  vtkPolyData *linea=vtkPolyData::New();
>>     vtkPoints *puntos=vtkPoints::New();
>>     vtkCellArray *lineas=vtkCellArray::New();
>>  vtkPolyDataMapper2D *mapper=vtkPolyDataMapper2D::New();
>>     vtkActor2D *actor=vtkActor2D::New();
>>     vtkRenderer *render=vtkRenderer::New();
>>     vtkRenderWindow *ventana=vtkRenderWindow::New();
>>     vtkRenderWindowInteractor *interac=vtkRenderWindowInteractor::New();
>>     vtkCoordinate *coor=vtkCoordinate::New();
>>  lineas->InsertNextCell(2);
>>     lineas->InsertCellPoint(0);
>>     lineas->InsertCellPoint(1);
>>  puntos->InsertPoint(0,0.0,0.0,0.0);
>>     puntos->InsertPoint(1,1.0,1.0,0.0);
>>  linea->SetPoints(puntos);
>>     linea->SetLines(lineas);
>>  coor->SetCoordinateSystemToNormalizedViewport();
>>  mapper->SetInput(linea);
>>     mapper->SetTransformCoordinate(coor);
>>  actor->SetMapper(mapper);
>>     actor->GetProperty()->SetColor(1.0,0.0,0.0);
>> 
>> actor->GetPositionCoordinate()->SetCoordinateSystemToNormalizedViewport();
>> 
>> actor->GetPosition2Coordinate()->SetCoordinateSystemToNormalizedViewport();
>>     //actor->GetPosition2Coordinate()->SetReferenceCoordinate(NULL);
>>    actor->GetPositionCoordinate()->SetValue(0.0,0.0,0.0);
>>     actor->GetPosition2Coordinate()->SetValue(0.5,0.5,0.0); //¡¡¡Here!!!
>>  render->AddActor2D(actor);
>>     render->SetBackground(0.1,0.2,0.4);
>> //    render->ResetCamera();
>> //    render->ResetCameraClippingRange();
>>  ventana->AddRenderer(render);
>>  interac->SetRenderWindow(ventana);
>>  ventana->Render();
>>     interac->Start();
>>  linea->Delete();
>>     puntos->Delete();
>>     lineas->Delete();
>>  mapper->Delete();
>>     actor->Delete();
>>     render->Delete();
>>     ventana->Delete();
>>     interac->Delete();
>>     coor->Delete();
>>  return 0;}
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