[vtkusers] Crash in vtkOpenGLContextDevice2D::ComputeStringBounds when getting bounding rect of vtkAxis

[Elvis Stansvik]

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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