ViewportDisplayCallback Class Reference

Enables non-geometric plugins to draw in the viewport. More...

#include <maxapi.h>

Inheritance diagram for ViewportDisplayCallback:

Public Member Functions
virtual	~ViewportDisplayCallback ()
virtual void	Display (TimeValue t, ViewExp *vpt, int flags)=0
	This method is called to allow the plug-in to draw in the viewports.
virtual void	GetViewportRect (TimeValue t, ViewExp *vpt, Rect *rect)=0
	Retrieves the dimensions of the specified viewport given an ViewExp interface to it.
virtual BOOL	Foreground ()=0
	Flags whether to draw in the foreground or background plane.
Public Member Functions inherited from InterfaceServer
virtual UtilExport	~InterfaceServer ()
	Destructor.
virtual UtilExport BaseInterface *	GetInterface (Interface_ID id)
template<class InterfaceType >
InterfaceType *	GetTypedInterface ()

Additional Inherited Members
Static Public Member Functions inherited from MaxHeapOperators
static UtilExport void *	operator new (size_t size)
	Standard new operator used to allocate objects If there is insufficient memory, an exception will be thrown.
static UtilExport void *	operator new (size_t size, const std::nothrow_t &e)
	Standard new operator used to allocate objects if there is insufficient memory, NULL will be returned.
static UtilExport void *	operator new (size_t size, const char *filename, int line)
	New operator used to allocate objects that takes the filename and line number where the new was called If there is insufficient memory, an exception will be thrown.
static UtilExport void *	operator new (size_t size, int block_type, const char *filename, int line)
	New operator used to allocate objects that takes the type of memory, filename and line number where the new was called If there is insufficient memory, an exception will be thrown.
static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, const char *filename, int line)
	New operator used to allocate objects that takes the filename and line number where the new was called If there is insufficient memory, NULL will be returned.
static UtilExport void *	operator new (size_t size, unsigned long flags)
	New operator used to allocate objects that takes extra flags to specify special operations If there is insufficient memory, an exception will be thrown.
static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, unsigned long flags)
	New operator used to allocate objects that takes extra flags to specify special operations If there is insufficient memory, NULL will be returned.
static UtilExport void *	operator new[] (size_t size)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown.
static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned.
static UtilExport void *	operator new[] (size_t size, const char *filename, int line)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown.
static UtilExport void *	operator new[] (size_t size, int block_type, const char *filename, int line)
	New operator used to allocate arrays of objects.
static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, const char *filename, int line)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned.
static UtilExport void *	operator new[] (size_t size, unsigned long flags)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown.
static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, unsigned long flags)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned.
static UtilExport void	operator delete (void *ptr)
	Standard delete operator used to deallocate an object If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete (void *ptr, const std::nothrow_t &e)
	Standard delete operator used to deallocate an object If the pointer is invalid, nothing will happen.
static UtilExport void	operator delete (void *ptr, const char *filename, int line)
	Delete operator used to deallocate an object that takes the filename and line number where the delete was called If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete (void *ptr, int block_type, const char *filename, int line)
	Delete operator used to deallocate an object that takes the type of memory, filename and line number where the delete was called If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete (void *ptr, const std::nothrow_t &e, const char *filename, int line)
	Delete operator used to deallocate an object that takes the filename and line number where the delete was called If the pointer is invalid, nothing will happen.
static UtilExport void	operator delete (void *ptr, unsigned long flags)
	Delete operator used to deallocate an object that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete (void *ptr, const std::nothrow_t &e, unsigned long flags)
	Delete operator used to deallocate an object that takes extra flags to specify special operations If the pointer is invalid, nothing will happen.
static UtilExport void	operator delete[] (void *ptr)
	Standard delete operator used to deallocate an array of objects If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e)
	Standard delete operator used to deallocate an array of objects If the pointer is invalid, nothing will happen.
static UtilExport void	operator delete[] (void *ptr, const char *filename, int line)
	Delete operator used to deallocate an array of objects that takes the filename and line number where the delete was called If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete[] (void *ptr, int block_type, const char *filename, int line)
	Delete operator used to deallocate an array of objects that takes the type of memory, filename and line number where the delete was called If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e, const char *filename, int line)
	Delete operator used to deallocate an array of objects that takes the filename and line number where the delete was called If the pointer is invalid, nothing will happen.
static UtilExport void	operator delete[] (void *ptr, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown.
static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown.
static UtilExport void *	operator new (size_t size, void *placement_ptr)
	Placement new operator.
static UtilExport void	operator delete (void *ptr, void *placement_ptr)
	Placement delete operator.
static UtilExport void *	aligned_malloc (size_t size, size_t alignment)
	Allocates memory on a specified alignment boundary.
static UtilExport void *	aligned_realloc (void *ptr, size_t size, size_t alignment)
	Reallocates memory on a specified alignment boundary.
static UtilExport void	aligned_free (void *ptr)
	Frees a block of memory that was allocated with aligned_malloc/aligned_realloc.

Detailed Description

Enables non-geometric plugins to draw in the viewport.

This class is a callback object that enables plug-ins that aren't actually objects (such as utility plug-ins) to draw in the 3ds Max viewports. Plugin classes that sub-class this can also assign a numerical priority to their callbacks by also implementing the ISceneCallbackPriority interface. See the following methods in class Interface that register and unregister this callback object:

• Interface::RegisterViewportDisplayCallback()
• Interface::UnRegisterViewportDisplayCallback()
• Interface::NotifyViewportDisplayCallbackChanged()

  See also

  Class Interface, Class ViewExp

Constructor & Destructor Documentation

~ViewportDisplayCallback()

virtual ~ViewportDisplayCallback ( )

inlinevirtual

Remarks

Destructor.

{}

Member Function Documentation

Display()

virtual void Display ( TimeValue  t, ViewExp *  vpt, int  flags  )

pure virtual

This method is called to allow the plug-in to draw in the viewports.

Parameters

t	- The current time when this method is called.
vpt	- An interface into the viewport.
flags	- These flags are used internally.

GetViewportRect()

virtual void GetViewportRect ( TimeValue  t, ViewExp *  vpt, Rect *  rect  )

pure virtual

Retrieves the dimensions of the specified viewport given an ViewExp interface to it.

Parameters

t	- The time to get the viewport rectangle.
vpt	- Specifies which viewport
rect	- The rectangle is returned here.

Foreground()

virtual BOOL Foreground ( )

pure virtual

Flags whether to draw in the foreground or background plane.

This method should return TRUE if the object changes a lot or FALSE if it doesn't change very much. This method relates to the foreground/background display system used by 3ds Max. Basically, items that change a lot are placed in the foreground buffer. Items that don't change much are placed in the background buffer and simply blitted to the display. See the Advanced Topics section on Foreground / Background Planes for more details. Most plug-ins can simply return TRUE because they are not likely to be very heavyweight objects (they are usually just a gizmo or apparatus image) and can simply go into the foreground. On the other hand, some items, for instance the 3ds Max home grid, don't change and can always go into the background. The home grid only changes when the view direction is changed in which case everything is redrawn.