查找 base/super class 成员的实现
Finding an Implementation of a member of a base/super class
好的，所以我正在学习 C++ 中的 base/super 类/ 继承/ 和虚函数。
下面是 header 文件中设置的 Get/Set 函数，我正在查看增变器 SetSize(int, int);
class VTKCOMMONCORE_EXPORT vtkWindow : public vtkObject
{
public:
vtkTypeMacro(vtkWindow,vtkObject);
void PrintSelf(ostream& os, vtkIndent indent);
.
.
.
// Description:
// Set/Get the size of the window in screen coordinates in pixels.
virtual int *GetSize();
virtual void SetSize(int,int);
virtual void SetSize(int a[2]);
根据我对继承和虚函数的理解，这只是设置函数，需要在其他地方定义，无论是在此 header 还是其他地方。我正在努力寻找 SetSize 的定义位置，我在 main 中为其提供值，但是 Size 在哪里设置为变量，然后该变量在哪里进入定义实际 window 的更大进程尺寸。显然我没有给你所有的信息来告诉我它的确切位置，但我不知道如何弄清楚它是如何从我的 main 中调用它，到设置实际的 window 大小的渲染器。
我希望所有这些都有意义并且我使用的是正确的术语，我将不胜感激任何帮助或进一步阅读建议，因为我不确定还可以搜索什么来找到这个答案。
下面是完整的header文件供参考
/*=========================================================================
Program: Visualization Toolkit
Module: vtkWindow.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkWindow - window superclass for vtkRenderWindow
// .SECTION Description
// vtkWindow is an abstract object to specify the behavior of a
// rendering window. It contains vtkViewports.
// .SECTION see also
// vtkRenderWindow vtkViewport
#ifndef vtkWindow_h
#define vtkWindow_h
#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObject.h"
class vtkUnsignedCharArray;
class VTKCOMMONCORE_EXPORT vtkWindow : public vtkObject
{
public:
vtkTypeMacro(vtkWindow,vtkObject);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// These are window system independent methods that are used
// to help interface vtkWindow to native windowing systems.
virtual void SetDisplayId(void *) = 0;
virtual void SetWindowId(void *) = 0;
virtual void SetParentId(void *) = 0;
virtual void *GetGenericDisplayId() = 0;
virtual void *GetGenericWindowId() = 0;
virtual void *GetGenericParentId() = 0;
virtual void *GetGenericContext() = 0;
virtual void *GetGenericDrawable() = 0;
virtual void SetWindowInfo(char *) = 0;
virtual void SetParentInfo(char *) = 0;
// Description:
// Set/Get the position in screen coordinates of the rendering window.
virtual int *GetPosition();
virtual void SetPosition(int,int);
virtual void SetPosition(int a[2]);
// Description:
// Set/Get the size of the window in screen coordinates in pixels.
virtual int *GetSize();
virtual void SetSize(int,int);
virtual void SetSize(int a[2]);
// Description:
// GetSize() returns the size * this->TileScale, whereas this method returns
// the size without multiplying with the tile scale.
int *GetActualSize();
// Description:
// Get the current size of the screen in pixels.
virtual int *GetScreenSize() = 0;
// Description:
// Keep track of whether the rendering window has been mapped to screen.
vtkSetMacro(Mapped,int);
vtkGetMacro(Mapped,int);
vtkBooleanMacro(Mapped,int);
// Description:
// Turn on/off erasing the screen between images. This allows multiple
// exposure sequences if turned on. You will need to turn double
// buffering off or make use of the SwapBuffers methods to prevent
// you from swapping buffers between exposures.
vtkSetMacro(Erase,int);
vtkGetMacro(Erase,int);
vtkBooleanMacro(Erase,int);
// Description:
// Keep track of whether double buffering is on or off
vtkSetMacro(DoubleBuffer,int);
vtkGetMacro(DoubleBuffer,int);
vtkBooleanMacro(DoubleBuffer,int);
// Description:
// Get name of rendering window
vtkGetStringMacro(WindowName);
vtkSetStringMacro(WindowName);
// Description:
// Ask each viewport owned by this Window to render its image and
// synchronize this process.
virtual void Render() = 0;
// Description:
// Get the pixel data of an image, transmitted as RGBRGBRGB. The
// front argument indicates if the front buffer should be used or the back
// buffer. It is the caller's responsibility to delete the resulting
// array. It is very important to realize that the memory in this array
// is organized from the bottom of the window to the top. The origin
// of the screen is in the lower left corner. The y axis increases as
// you go up the screen. So the storage of pixels is from left to right
// and from bottom to top.
// (x,y) is any corner of the rectangle. (x2,y2) is its opposite corner on
// the diagonal.
virtual unsigned char *GetPixelData(int x, int y, int x2, int y2,
int front) = 0;
virtual int GetPixelData(int x, int y, int x2, int y2, int front,
vtkUnsignedCharArray *data) = 0;
// Description:
// Return a best estimate to the dots per inch of the display
// device being rendered (or printed).
vtkGetMacro(DPI,int);
vtkSetClampMacro(DPI,int,1,VTK_INT_MAX);
// Description:
// Attempt to detect and set the DPI of the display device by querying the
// system. Note that this is not supported on all backends, and this method
// will return false if the DPI could not be detected. Use GetDPI() to
// inspect the detected value.
virtual bool DetectDPI() { return false; }
// Description:
// Create a window in memory instead of on the screen. This may not be
// supported for every type of window and on some windows you may need to
// invoke this prior to the first render.
vtkSetMacro(OffScreenRendering,int);
vtkGetMacro(OffScreenRendering,int);
vtkBooleanMacro(OffScreenRendering,int);
// Description:
// Make the window current. May be overridden in subclasses to do
// for example a glXMakeCurrent or a wglMakeCurrent.
virtual void MakeCurrent() {}
// Description:
// These methods are used by vtkWindowToImageFilter to tell a VTK window
// to simulate a larger window by tiling. For 3D geometry these methods
// have no impact. It is just in handling annotation that this information
// must be available to the mappers and the coordinate calculations.
vtkSetVector2Macro(TileScale,int);
vtkGetVector2Macro(TileScale,int);
void SetTileScale(int s) {this->SetTileScale(s,s);}
vtkSetVector4Macro(TileViewport,double);
vtkGetVector4Macro(TileViewport,double);
protected:
int OffScreenRendering;
vtkWindow();
~vtkWindow();
char *WindowName;
int Size[2];
int Position[2];
int Mapped;
int Erase;
int DoubleBuffer;
int DPI;
double TileViewport[4];
int TileSize[2];
int TileScale[2];
private:
vtkWindow(const vtkWindow&); // Not implemented.
void operator=(const vtkWindow&); // Not implemented.
};
#endif
好的，我找到了问题的答案
在 VTK 中，所有头文件 header.h 都有相应的文件 header.cxx。函数定义发生在 header.cxx 文件中。
好的，所以我正在学习 C++ 中的 base/super 类/ 继承/ 和虚函数。
下面是 header 文件中设置的 Get/Set 函数，我正在查看增变器 SetSize(int, int);
class VTKCOMMONCORE_EXPORT vtkWindow : public vtkObject
{
public:
vtkTypeMacro(vtkWindow,vtkObject);
void PrintSelf(ostream& os, vtkIndent indent);
.
.
.
// Description:
// Set/Get the size of the window in screen coordinates in pixels.
virtual int *GetSize();
virtual void SetSize(int,int);
virtual void SetSize(int a[2]);
根据我对继承和虚函数的理解，这只是设置函数，需要在其他地方定义，无论是在此 header 还是其他地方。我正在努力寻找 SetSize 的定义位置，我在 main 中为其提供值，但是 Size 在哪里设置为变量，然后该变量在哪里进入定义实际 window 的更大进程尺寸。显然我没有给你所有的信息来告诉我它的确切位置，但我不知道如何弄清楚它是如何从我的 main 中调用它，到设置实际的 window 大小的渲染器。
我希望所有这些都有意义并且我使用的是正确的术语，我将不胜感激任何帮助或进一步阅读建议，因为我不确定还可以搜索什么来找到这个答案。
下面是完整的header文件供参考
/*=========================================================================
Program: Visualization Toolkit
Module: vtkWindow.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkWindow - window superclass for vtkRenderWindow
// .SECTION Description
// vtkWindow is an abstract object to specify the behavior of a
// rendering window. It contains vtkViewports.
// .SECTION see also
// vtkRenderWindow vtkViewport
#ifndef vtkWindow_h
#define vtkWindow_h
#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObject.h"
class vtkUnsignedCharArray;
class VTKCOMMONCORE_EXPORT vtkWindow : public vtkObject
{
public:
vtkTypeMacro(vtkWindow,vtkObject);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// These are window system independent methods that are used
// to help interface vtkWindow to native windowing systems.
virtual void SetDisplayId(void *) = 0;
virtual void SetWindowId(void *) = 0;
virtual void SetParentId(void *) = 0;
virtual void *GetGenericDisplayId() = 0;
virtual void *GetGenericWindowId() = 0;
virtual void *GetGenericParentId() = 0;
virtual void *GetGenericContext() = 0;
virtual void *GetGenericDrawable() = 0;
virtual void SetWindowInfo(char *) = 0;
virtual void SetParentInfo(char *) = 0;
// Description:
// Set/Get the position in screen coordinates of the rendering window.
virtual int *GetPosition();
virtual void SetPosition(int,int);
virtual void SetPosition(int a[2]);
// Description:
// Set/Get the size of the window in screen coordinates in pixels.
virtual int *GetSize();
virtual void SetSize(int,int);
virtual void SetSize(int a[2]);
// Description:
// GetSize() returns the size * this->TileScale, whereas this method returns
// the size without multiplying with the tile scale.
int *GetActualSize();
// Description:
// Get the current size of the screen in pixels.
virtual int *GetScreenSize() = 0;
// Description:
// Keep track of whether the rendering window has been mapped to screen.
vtkSetMacro(Mapped,int);
vtkGetMacro(Mapped,int);
vtkBooleanMacro(Mapped,int);
// Description:
// Turn on/off erasing the screen between images. This allows multiple
// exposure sequences if turned on. You will need to turn double
// buffering off or make use of the SwapBuffers methods to prevent
// you from swapping buffers between exposures.
vtkSetMacro(Erase,int);
vtkGetMacro(Erase,int);
vtkBooleanMacro(Erase,int);
// Description:
// Keep track of whether double buffering is on or off
vtkSetMacro(DoubleBuffer,int);
vtkGetMacro(DoubleBuffer,int);
vtkBooleanMacro(DoubleBuffer,int);
// Description:
// Get name of rendering window
vtkGetStringMacro(WindowName);
vtkSetStringMacro(WindowName);
// Description:
// Ask each viewport owned by this Window to render its image and
// synchronize this process.
virtual void Render() = 0;
// Description:
// Get the pixel data of an image, transmitted as RGBRGBRGB. The
// front argument indicates if the front buffer should be used or the back
// buffer. It is the caller's responsibility to delete the resulting
// array. It is very important to realize that the memory in this array
// is organized from the bottom of the window to the top. The origin
// of the screen is in the lower left corner. The y axis increases as
// you go up the screen. So the storage of pixels is from left to right
// and from bottom to top.
// (x,y) is any corner of the rectangle. (x2,y2) is its opposite corner on
// the diagonal.
virtual unsigned char *GetPixelData(int x, int y, int x2, int y2,
int front) = 0;
virtual int GetPixelData(int x, int y, int x2, int y2, int front,
vtkUnsignedCharArray *data) = 0;
// Description:
// Return a best estimate to the dots per inch of the display
// device being rendered (or printed).
vtkGetMacro(DPI,int);
vtkSetClampMacro(DPI,int,1,VTK_INT_MAX);
// Description:
// Attempt to detect and set the DPI of the display device by querying the
// system. Note that this is not supported on all backends, and this method
// will return false if the DPI could not be detected. Use GetDPI() to
// inspect the detected value.
virtual bool DetectDPI() { return false; }
// Description:
// Create a window in memory instead of on the screen. This may not be
// supported for every type of window and on some windows you may need to
// invoke this prior to the first render.
vtkSetMacro(OffScreenRendering,int);
vtkGetMacro(OffScreenRendering,int);
vtkBooleanMacro(OffScreenRendering,int);
// Description:
// Make the window current. May be overridden in subclasses to do
// for example a glXMakeCurrent or a wglMakeCurrent.
virtual void MakeCurrent() {}
// Description:
// These methods are used by vtkWindowToImageFilter to tell a VTK window
// to simulate a larger window by tiling. For 3D geometry these methods
// have no impact. It is just in handling annotation that this information
// must be available to the mappers and the coordinate calculations.
vtkSetVector2Macro(TileScale,int);
vtkGetVector2Macro(TileScale,int);
void SetTileScale(int s) {this->SetTileScale(s,s);}
vtkSetVector4Macro(TileViewport,double);
vtkGetVector4Macro(TileViewport,double);
protected:
int OffScreenRendering;
vtkWindow();
~vtkWindow();
char *WindowName;
int Size[2];
int Position[2];
int Mapped;
int Erase;
int DoubleBuffer;
int DPI;
double TileViewport[4];
int TileSize[2];
int TileScale[2];
private:
vtkWindow(const vtkWindow&); // Not implemented.
void operator=(const vtkWindow&); // Not implemented.
};
#endif
好的，我找到了问题的答案
在 VTK 中，所有头文件 header.h 都有相应的文件 header.cxx。函数定义发生在 header.cxx 文件中。