[vtk-developers] Crash in vtkOpenGLContextDevice2D::ComputeStringBounds when getting bounding rect of vtkAxis

[Elvis Stansvik]

Den 17 feb. 2017 8:36 fm skrev "Elvis Stansvik" <
elvis.stansvik at orexplore.com>:
>
> Den 14 feb. 2017 7:56 fm skrev "Elvis Stansvik" <
elvis.stansvik at orexplore.com>:
> >
> > I realized that this is maybe a mail more suited for the developer
> > list, so sending it here.
>
> It would be great if some dev could just confirm that they see the same
crash in master.
>
> Perhaps GetBoundingRect was never meant to be made public? If so, I'm
looking for a way to map context scene coordinates to screen coordinates
(or alternatively, some other way of getting the pixel width of an axis).
>
> My use case is that I have an opacity/color editor setup similar to that
in ParaView, but I want an Y axis on the opacity editor, and to get the
color widget underneath aligned properly, I need the X screen coordinate
where the color plot area, since it's no longer 0, but shifted to the right
by the left axis.

s/where the color plot area/where the opacity plot area starts/

>
> Elvis
>
> >
> > Elvis
> >
> > 2017-02-12 12:30 GMT+01:00 Elvis Stansvik <elvis.stansvik at orexplore.com
>:
> > > Hi all,
> > >
> > > In the test case below, I'm trying to get the bounding rect of a
vtkAxis in
> > > a vtkChartXY, but I'm getting a crash in the call to GetBoundingRect
with
> > > the following backtrace:
> > >
> > > #0  vtkOpenGLContextDevice2D::ComputeStringBounds (this=this at entry
=0x689ea0,
> > > string=..., bounds=bounds at entry=0x7fffffffcda0)
> > >     at
> > >
/buildbot/vtk7-builder/build/Rendering/ContextOpenGL2/vtkOpenGLContextDevice2D.cxx:1755
> > > #1  0x00007ffff78454f1 in
vtkOpenGLContextDevice2D::ComputeStringBounds
> > > (this=0x689ea0, string=..., bounds=0x7fffffffcda0)
> > >     at
> > >
/buildbot/vtk7-builder/build/Rendering/ContextOpenGL2/vtkOpenGLContextDevice2D.cxx:1626
> > > #2  0x00007ffff6f2722d in vtkContext2D::ComputeStringBounds
> > > (this=this at entry=0x67e3f0, string=..., bounds=bounds at entry
=0x7fffffffcda0)
> > > at
/buildbot/vtk7-builder/build/Rendering/Context2D/vtkContext2D.cxx:645
> > > #3  0x00007ffff7ab4b28 in vtkAxis::GetBoundingRect (this=0x671490,
> > > painter=0x67e3f0) at
> > > /buildbot/vtk7-builder/build/Charts/Core/vtkAxis.cxx:990
> > > #4  0x0000000000402ab1 in main (argc=1, argv=0x7fffffffd038) at
> > > /home/estan/testcrash/main.cpp:50
> > >
> > > The reason seems to be that the render window (RenderWindow member) of
> > > vtkOpenGLContextDevice2D is NULL at that point (!).
> > >
> > > Am I using the GetBoundingRect API in the wrong way somehow? How can
I get
> > > the computed bounding rect for a vtkAxis?
> > >
> > > Thanks in advance,
> > > Elvis
> > >
> > > main.cpp:
> > >
> > > #include <vtkAxis.h>
> > > #include <vtkChartXY.h>
> > > #include <vtkContextScene.h>
> > > #include <vtkContextView.h>
> > > #include <vtkFloatArray.h>
> > > #include <vtkNew.h>
> > > #include <vtkPlot.h>
> > > #include <vtkRenderer.h>
> > > #include <vtkRenderWindow.h>
> > > #include <vtkRenderWindowInteractor.h>
> > > #include <vtkTable.h>
> > >
> > > int main(int argc, char *argv[]) {
> > >     vtkNew<vtkRenderer> renderer;
> > >
> > >     vtkNew<vtkRenderWindow> window;
> > >     window->AddRenderer(renderer.Get());
> > >
> > >     vtkNew<vtkRenderWindowInteractor> interactor;
> > >     interactor->SetRenderWindow(window.Get());
> > >
> > >     vtkNew<vtkChartXY> chart;
> > >
> > >     vtkNew<vtkTable> table;
> > >     vtkNew<vtkFloatArray> xArray;
> > >     xArray->SetName("X Axis");
> > >     table->AddColumn(xArray.Get());
> > >     vtkNew<vtkFloatArray> yArray;
> > >     yArray->SetName("Y Axis");
> > >     table->AddColumn(yArray.Get());
> > >     table->SetNumberOfRows(2);
> > >     table->SetValue(0, 0, 0);
> > >     table->SetValue(0, 1, 0);
> > >     table->SetValue(1, 0, 1);
> > >     table->SetValue(1, 1, 1);
> > >
> > >     auto linePlot = chart->AddPlot(vtkChart::LINE);
> > >     linePlot->SetInputData(table.Get(), 0, 1);
> > >
> > >     vtkNew<vtkContextView> view;
> > >     view->GetScene()->AddItem(chart.Get());
> > >     view->SetRenderWindow(window.Get());
> > >     view->SetInteractor(interactor.Get());
> > >
> > >     window->Render();
> > >
> > >     // Get bounding rect of the left axis
> > >     auto leftAxis = chart->GetAxis(vtkAxis::LEFT);
> > >     leftAxis->Update();
> > >     auto rect = leftAxis->GetBoundingRect(view->GetContext());
> > >
> > >     interactor->Start();
> > >
> > >     return 0;
> > > }
> > >
> > >
> > > CMakeLists.txt:
> > >
> > > cmake_minimum_required(VERSION 3.1)
> > >
> > > project(TestCase)
> > >
> > > set(CMAKE_CXX_STANDARD 11)
> > > set(CMAKE_CXX_STANDARD_REQUIRED ON)
> > >
> > > find_package(VTK COMPONENTS
> > >     vtkChartsCore
> > >     vtkCommonCore
> > >     vtkInteractionStyle
> > >     vtkRenderingContext2D
> > >     vtkRenderingContextOpenGL2
> > >     vtkRenderingCore
> > >     vtkRenderingFreeType
> > >     vtkRenderingOpenGL2
> > >     vtkViewsContext2D
> > > )
> > >
> > > add_executable(TestCase main.cpp)
> > >
> > > target_link_libraries(TestCase PUBLIC
> > >     vtkChartsCore
> > >     vtkCommonCore
> > >     vtkInteractionStyle
> > >     vtkRenderingContext2D
> > >     vtkRenderingContextOpenGL2
> > >     vtkRenderingCore
> > >     vtkRenderingFreeType
> > >     vtkRenderingOpenGL2
> > >     vtkViewsContext2D
> > > )
> > >
> > > target_include_directories(TestCase PUBLIC
> > >     ${VTK_INCLUDE_DIRS}
> > > )
> > >
> > >
> > > target_compile_definitions(TestCase PUBLIC
> > >     ${VTK_DEFINITIONS}
> > > )
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