[vtkusers] Bug in vtkXYPlotActor ?

[REGAT-BARREL Aurélien]

Hi,
I think there is a bug in vtkXYPlotActor.
The following curve is clipped on the Y axis if offset < 0.1 :
 
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkXYPlotActor.h>
#include <vtkFloatArray.h>
#include <vtkFieldData.h>
#include <vtkDataObject.h>
#ifdef _MSC_VER
#pragma comment( lib, "vtkCommon.lib" )
#pragma comment( lib, "vtkRendering.lib" )
#pragma comment( lib, "vtkHybrid.lib" )
#endif
int main()
{
    // rendering stuff
    vtkRenderWindow * renWin = vtkRenderWindow::New();
    vtkRenderWindowInteractor * Iter = vtkRenderWindowInteractor::New();
    renWin->SetInteractor( Iter );
    vtkRenderer * ren = vtkRenderer::New();        
    renWin->AddRenderer( ren );
    // plot actor
    vtkXYPlotActor * xyplot = vtkXYPlotActor::New();        
    xyplot->SetWidth( 1 );
    xyplot->SetHeight( 1 );
    xyplot->SetPosition( 0, 0 );
    ren->AddActor2D( xyplot );
    // add buggy curve ([0, 0.09], [1, 1.59])
    vtkFloatArray * xarray = vtkFloatArray::New();
    vtkFloatArray * yarray = vtkFloatArray::New();
 
    double offset = 0.09;
    xarray->InsertNextValue( 0 );
    yarray->InsertNextValue( offset );
    xarray->InsertNextValue( 1 );
    yarray->InsertNextValue( 1.50 + offset );
 
    vtkFieldData * values = vtkFieldData::New();
    values->AllocateArrays( 2 );
    values->AddArray( xarray );
    values->AddArray( yarray );
    
    vtkDataObject * data = vtkDataObject::New();
    data->SetFieldData( values );
    xyplot->AddDataObjectInput( data );
    xyplot->SetDataObjectYComponent( 0, 1 );
    // render
    renWin->SetSize( 500, 500 );
    renWin->Render();
    Iter->Initialize();
    Iter->Start();
}
 
If offset >= 0.1 there is no problem.
I use vtk 4.4. with vtkXYPlotActor.cxx revision 1.52.


Aurélien REGAT-BARREL
		
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