VTK继承问题 我现在尝试定制C++ Android原生示例，以便能够在使用平板电脑时改变与2个（或3个）手指交互时发生的行为。根据我对VTK管道的理解，因此我应该修改vtkAndroidRenderWindowInteractor的行为（如果我错了，请纠正我）。 这就是我到目前为止所做的：

myRenderInteractor.h

myRenderInteractor.cxx

最后是main.cxx

所以我想我应该检查build.make，它包含：

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---

这就是我需要更改的文件。坦白地说，我完全迷路了，我很想得到更多关于整个过程的文档，因为我出于某种原因不能使用cmake。当然，我不想直接修改makefile，但现在看来我别无选择。

这看起来像是您在库中定义了myRenderInteractor，但后来忘记了通过target\u link\u库将可执行文件链接到该库

---

根据你问题中的错误输出，你从ld得到了一个“未定义引用”错误——这是一个链接器错误。你的代码编译得很好。您需要将包含myRenderInteractor的库添加到链接到最终可执行文件的库列表中。如果您没有使用CMake生成所涉及的makefiles，则需要将库名称添加到手工制作的Makefile中链接的内容列表中。

谢谢您的回答。我应该在Makefile中这样做吗？因为我在使用构建vtk时自动生成的Makefile，因为我自己直接获取示例时遇到了问题。在这之前，它不会给我带来问题吗？例如，当简单地尝试包括标题？作为我的答案的编辑回答。。。（是的，在Makefile中这样做，不，在此之前不会出现问题-如果包含头文件，则在编译时会定义它…但是如果不链接到它，则在链接时不会定义它…）感谢您的编辑。我现在完全理解了，但在实际编辑makefile时，我遇到了一些问题。如果你不介意的话，我可能需要一些帮助（见编辑）。事实上，当涉及到android示例时，我不能使用CMake而不犯这个错误。再次感谢您迄今为止提供的帮助

#include "myRenderInteractor.h"

vtkStandardNewMacro(myRenderInteractor);

myRenderInteractor::myRenderInteractor(){
    vtkAndroidRenderWindowInteractor();
}

~myRenderInteractor::myRenderInteractor(){
    ~vtkAndroidRenderWindowInteractor();
}

void myRenderInteractor::log(){
    // ...
}

#include "vtkNew.h"

#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkConeSource.h"
#include "vtkDebugLeaks.h"
#include "vtkGlyph3D.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
#include "vtkTextActor.h"
#include "vtkTextProperty.h"

#include "myRenderInteractor.h"
#include "vtkAndroidRenderWindowInteractor.h"

#include <android/log.h>
#include <android_native_app_glue.h>

#ifndef LOGI
  #define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "NativeVTK", __VA_ARGS__))
#endif
#ifndef LOGW
  #define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "NativeVTK", __VA_ARGS__))
#endif

/**
 * This is the main entry point of a native application that is using
 * android_native_app_glue.  It runs in its own thread, with its own
 * event loop for receiving input events and doing other things.
 */
void android_main(struct android_app* state)
{
  // Make sure glue isn't stripped.
  app_dummy();

  vtkNew<vtkRenderWindow> renWin;
  vtkNew<vtkRenderer> renderer;
  vtkNew<myRenderInteractor> iren;

  // this line is key, it provides the android
  // state to VTK
  iren->SetAndroidApplication(state);

  renWin->AddRenderer(renderer.Get());
  iren->SetRenderWindow(renWin.Get());

  vtkNew<vtkSphereSource> sphere;
  sphere->SetThetaResolution(8);
  sphere->SetPhiResolution(8);

  vtkNew<vtkPolyDataMapper> sphereMapper;
  sphereMapper->SetInputConnection(sphere->GetOutputPort());
  vtkNew<vtkActor> sphereActor;
  sphereActor->SetMapper(sphereMapper.Get());

  vtkNew<vtkConeSource> cone;
  cone->SetResolution(6);

  vtkNew<vtkGlyph3D> glyph;
  glyph->SetInputConnection(sphere->GetOutputPort());
  glyph->SetSourceConnection(cone->GetOutputPort());
  glyph->SetVectorModeToUseNormal();
  glyph->SetScaleModeToScaleByVector();
  glyph->SetScaleFactor(0.25);

  vtkNew<vtkPolyDataMapper> spikeMapper;
  spikeMapper->SetInputConnection(glyph->GetOutputPort());

  vtkNew<vtkActor> spikeActor;
  spikeActor->SetMapper(spikeMapper.Get());

  renderer->AddActor(sphereActor.Get());
  renderer->AddActor(spikeActor.Get());
  renderer->SetBackground(0.4,0.5,0.6);

  vtkNew<vtkTextActor> ta;
  ta->SetInput("Droids Rock");
  ta->GetTextProperty()->SetColor( 0.5, 1.0, 0.0 );
  ta->SetDisplayPosition(50,50);
  ta->GetTextProperty()->SetFontSize(32);
  renderer->AddActor(ta.Get());

  renWin->Render();
  iren->Start();
}

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