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<DIV><SPAN class=406043608-09072010><FONT face=Arial color=#0000ff>Hi
Elo,</FONT></SPAN></DIV>
<DIV><SPAN class=406043608-09072010><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=406043608-09072010><FONT face=Arial color=#0000ff>So, you have
set your y-axis range to be between 0 and 8, you then plot a curve where some of
those y-values are out of this range, so it doesn't plot them (it clips them
out). This appears to be normal behaviour in my opinion. If you want to see all
your curves, then you'll have to rescale your y-axis to fit them in by setting
the y-axis range from 0 to 15. Were you assuming it would automatically fit the
axes to the data, as within ParaView? This option may still be there, but I've
never used it.</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff></FONT> </DIV>
<DIV><SPAN class=406043608-09072010><FONT face=Arial
color=#0000ff>Cheers,</FONT></SPAN></DIV>
<DIV><SPAN class=406043608-09072010><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=406043608-09072010><FONT face=Arial
color=#0000ff>Adriano</FONT></SPAN></DIV>
<DIV><SPAN class=406043608-09072010></SPAN> </DIV><!-- Converted from text/plain format -->
<P>===================================<BR><BR>Adriano Gagliardi MEng
PhD<BR>Business Sector Leader<BR>Computational Aerodynamics<BR>Aircraft Research
Association Ltd.<BR>Manton Lane<BR>Bedford<BR><BR>Tel: 01234 32 4644<BR>E-mail:
agagliardi@ara.co.uk<BR>Url: www.ara.co.uk </P>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma><B>From:</B> vtkusers-bounces@vtk.org
[mailto:vtkusers-bounces@vtk.org] <B>On Behalf Of
</B>LiuNiansheng<BR><B>Sent:</B> 09 July 2010 03:56<BR><B>To:</B>
VTK<BR><B>Subject:</B> [vtkusers] A Problem About
vtkXYPlotActor<BR></FONT><BR></DIV>
<DIV></DIV>Hi everyone:
<DIV><BR></DIV>
<DIV>I'm a user of vtk. When I use vtkXYPlotActor to draw some lines at a
XYPlot, I found vtk miss one line.</DIV>
<DIV>That's my sample code of vtkXYPlotActor:</DIV>
<DIV><SPAN class=ecxApple-style-span
style="WHITE-SPACE: pre">=========================================================================
#include "vtkFloatArray.h" #include "vtkFieldData.h" #include "vtkDataObject.h"
#include "vtkXYPlotActor.h" #include "vtkXYPlotWidget.h" #include "vtkMath.h"
#include "vtkRenderWindow.h" #include "vtkRenderer.h" #include
"vtkRenderWindowInteractor.h" int main() { vtkFloatArray* vtkXYValues =
vtkFloatArray::New(); vtkXYValues->SetNumberOfComponents(
static_cast<vtkIdType>(2) ); float xy[2]; xy[0] =
static_cast<float>(0); xy[1] = static_cast<float>(0) ;
vtkXYValues->InsertNextTuple( xy ); xy[0] = static_cast<float>(2);
xy[1] = static_cast<float>(3) ; vtkXYValues->InsertNextTuple( xy );
xy[0] = static_cast<float>(4); xy[1] = static_cast<float>(15) ;
vtkXYValues->InsertNextTuple( xy ); xy[0] = static_cast<float>(6);
xy[1] = static_cast<float>(1) ; vtkXYValues->InsertNextTuple( xy );
xy[0] = static_cast<float>(7); xy[1] = static_cast<float>(0.1) ;
vtkXYValues->InsertNextTuple( xy ); xy[0] = static_cast<float>(8);
xy[1] = static_cast<float>(10) ; vtkXYValues->InsertNextTuple( xy );
xy[0] = static_cast<float>(9); xy[1] = static_cast<float>(9) ;
vtkXYValues->InsertNextTuple( xy ); xy[0] = static_cast<float>(10);
xy[1] = static_cast<float>(0) ; vtkXYValues->InsertNextTuple( xy );
vtkFieldData* vtkGraphFieldData = vtkFieldData::New();
vtkGraphFieldData->AddArray( vtkXYValues ); vtkXYValues->Delete();
vtkDataObject* vtkGraphDataObject = vtkDataObject::New();
vtkGraphDataObject->SetFieldData( vtkGraphFieldData );
vtkGraphFieldData->Delete(); vtkXYPlotActor* vtkGraph =
vtkXYPlotActor::New(); vtkGraph->AddDataObjectInput( vtkGraphDataObject );
vtkGraphDataObject->Delete(); vtkGraph->SetDataObjectPlotModeToColumns();
vtkGraph->SetXValuesToValue(); int curve = 0;
vtkGraph->SetDataObjectXComponent( curve, 0 );
vtkGraph->SetDataObjectYComponent( curve, 1 ); vtkGraph->SetXRange( 0,
10); vtkGraph->SetYRange( 0, 8); vtkGraph->SetPlotColor( curve, 1,0,0 );
vtkRenderer* renderer = vtkRenderer::New(); renderer->AddActor2D( vtkGraph );
vtkRenderWindow* renderWin = vtkRenderWindow::New(); renderWin->AddRenderer(
renderer ); vtkRenderWindowInteractor* interactor
=vtkRenderWindowInteractor::New(); interactor->SetRenderWindow( renderWin );
vtkXYPlotWidget* vtkXYPlotWidget = vtkXYPlotWidget::New();
vtkXYPlotWidget->SetXYPlotActor( vtkGraph );
vtkXYPlotWidget->SetInteractor( interactor ); vtkXYPlotWidget->SetEnabled(
true ); interactor->Initialize(); interactor->Start(); return 0; }
========================================================================= I
define eight points,<SPAN lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: Arial">a(0,0), b(2,3), c(4,15), d(6,1),
e(7,0), f(8,10), g(9,9),h(10,0). And the range of xy axis is defined from point
(0,0) </SPAN></SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre"><SPAN lang=EN-US
style="FONT-SIZE: 10.5pt; FONT-FAMILY: Arial">to (10,8). So there are three
points(cfg) out of range. There should be six lines except the line fg which is
out of range, but only five lines </SPAN></SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre"><SPAN
lang=EN-US></SPAN>have been drawn. when I change these point to test, I found
the line which the value of y axis is from 0(the min value of y
axis) </SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre">to a value bigger
than the max value of y axis will be ignored by vtk. </SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span
style="WHITE-SPACE: pre"><BR></SPAN></DIV><SP class=ecxApple-style-span
style="WHITE-SPACE: pre" an> I guess the problem maybe happen when clipping
data. So I debugged vtkXYPlotActor source, and I found the function </SPAN>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre">named
ClipPlotData() have been called in the function CreatPlotData().</SPAN>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre"></SPAN><SPAN
class=ecxApple-style-span style="WHITE-SPACE: pre">The algorithm of clipping
data is no problem. the number of lines which should be drawn is
six.</SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre"><BR></SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre">Cause I don't have
enough time to do further research. If anyone has any information about this
problem, please let me know.</SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre"><BR></SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre">th
anks.</SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre"><BR></SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre">sincerely
yours:</SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre">Elo</SPAN></DIV>
<DIV><SPAN class=ecxApple-style-span style="WHITE-SPACE: pre"><BR></SPAN>
<DIV><BR></DIV></DIV></DIV><BR>
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