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SbViewportRegion Class Reference
[Base classes]

The SbViewportRegion class is a viewport within a full window.

The SbViewportRegion class contains information to represent a subview within a window. It stores information about the origin and size of the subview, aswell as the size of the underlying "full" window. More...

#include <Inventor/SbViewportRegion.h>

List of all members.

Public Member Functions

 SbViewportRegion (void)
 SbViewportRegion (short width, short height)
 SbViewportRegion (SbVec2s winSize)
 SbViewportRegion (const SbViewportRegion &vpReg)
void setWindowSize (short width, short height)
void setWindowSize (SbVec2s winSize)
void setViewport (float left, float bottom, float width, float height)
void setViewport (SbVec2f origin, SbVec2f size)
void setViewportPixels (short left, short bottom, short width, short height)
void setViewportPixels (SbVec2s origin, SbVec2s size)
const SbVec2sgetWindowSize (void) const
const SbVec2fgetViewportOrigin (void) const
const SbVec2sgetViewportOriginPixels (void) const
const SbVec2fgetViewportSize (void) const
const SbVec2sgetViewportSizePixels (void) const
float getViewportAspectRatio (void) const
void scaleWidth (float ratio)
void scaleHeight (float ratio)
void setPixelsPerInch (float ppi)
float getPixelsPerInch (void) const
float getPixelsPerPoint (void) const
void print (FILE *file) const

Friends

int operator== (const SbViewportRegion &reg1, const SbViewportRegion &reg2)
int operator!= (const SbViewportRegion &reg1, const SbViewportRegion &reg2)


Detailed Description

The SbViewportRegion class is a viewport within a full window.

The SbViewportRegion class contains information to represent a subview within a window. It stores information about the origin and size of the subview, aswell as the size of the underlying "full" window.

Available methods include inquiries and manipulation in both normalized coordinates and pixel coordinates.

Below is a small example showing how the viewport of a viewer class can be modified, within a "proper" Coin and window system context. Hit 'D' or 'U' to move the viewport region 40 pixels down or up, respectively. Click 'Esc' and zoom with left + middle mouse buttons, to see how the region is defined, where no 3D geometry will be visible outside it. Click 'Esc' again to use 'U' and 'D'.

  // Copyright (C) 2000-2007 by Systems in Motion. All rights reserved.

  #include <Inventor/Qt/SoQt.h>
  #include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
  #include <Inventor/nodes/SoEventCallback.h>
  #include <Inventor/nodes/SoSeparator.h>
  #include <Inventor/nodes/SoCone.h>
  #include <Inventor/events/SoKeyboardEvent.h>

  // ************************************************************

  static void
  keypresscbfunc(void * userdata, SoEventCallback * keyboardcb)
  {
    SoQtExaminerViewer * viewer = (SoQtExaminerViewer *)userdata;

    const SoEvent * event = keyboardcb->getEvent();

    int shift = 0;

    if (SO_KEY_PRESS_EVENT(event, U)) {
      shift = 40;
      keyboardcb->setHandled();
    }
    else if (SO_KEY_PRESS_EVENT(event, D)) {
      shift = -40;
      keyboardcb->setHandled();
    }

    if (keyboardcb->isHandled()) {
      SbViewportRegion vpr = viewer->getViewportRegion();
      SbVec2s size = vpr.getViewportSizePixels();
      SbVec2s origin = vpr.getViewportOriginPixels();
      origin[1] -= shift;
      vpr.setViewportPixels(origin, size);
      viewer->setViewportRegion(vpr);
    }
  }

  // ************************************************************

  int
  main(int argc, char ** argv)
  {
    QWidget * window = SoQt::init(argv[0]);

    SoSeparator * root = new SoSeparator;
    root->ref();

    root->addChild(new SoCone);

    SoQtExaminerViewer * viewer = new SoQtExaminerViewer(window);

    SoEventCallback * eventcb = new SoEventCallback;
    eventcb->addEventCallback(SoKeyboardEvent::getClassTypeId(),
                              keypresscbfunc, viewer);
    root->insertChild(eventcb, 0);

    viewer->setViewing(FALSE);
    viewer->setDecoration(FALSE);
    viewer->setSceneGraph(root);
    viewer->show();
    SoQt::show(window);

    SoQt::mainLoop();

    delete viewer;
    root->unref();
    return 0;
  }

See also:
SbViewVolume

Constructor & Destructor Documentation

SbViewportRegion::SbViewportRegion ( void   ) 

The default SbViewportRegion constructor initializes the viewport to fully cover a [100, 100] size window with 72 pixels per inch resolution.

SbViewportRegion::SbViewportRegion ( short  width,
short  height 
)

Construct and initialize an SbViewportRegion instance with the given pixel value window dimensions. The viewport within this window will be set to cover the window completely.

References SoDebugError::postWarning().

SbViewportRegion::SbViewportRegion ( SbVec2s  winsizearg  ) 

Construct and initialize an SbViewportRegion instance with the given pixel value window dimensions. The viewport within this window will be set to cover the window completely.

References SoDebugError::postWarning().

SbViewportRegion::SbViewportRegion ( const SbViewportRegion vpReg  ) 

Copy constructor.


Member Function Documentation

void SbViewportRegion::setWindowSize ( short  width,
short  height 
)

Set the window size in pixels. The viewport rectangle dimensions will stay intact.

See also:
getWindowSize()

References SoDebugError::postWarning(), and SbVec2s::setValue().

Referenced by SoSceneManager::setWindowSize(), and setWindowSize().

void SbViewportRegion::setWindowSize ( SbVec2s  winsizearg  ) 

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

References SoDebugError::postWarning(), and setWindowSize().

void SbViewportRegion::setViewport ( float  left,
float  bottom,
float  width,
float  height 
)

Set up the origin and size of the viewport region in normalized coordinates.

See also:
getViewportOrigin(), getViewportSize(), setViewportPixels().

References SoDebugError::postWarning(), and SbVec2f::setValue().

Referenced by setViewport().

void SbViewportRegion::setViewport ( SbVec2f  origin,
SbVec2f  size 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

References SoDebugError::postWarning(), and setViewport().

void SbViewportRegion::setViewportPixels ( short  left,
short  bottom,
short  width,
short  height 
)

Set up the origin and size of the viewport region in pixel coordinates.

See also:
getViewportOriginPixels(), getViewportSizePixels(), setViewport()

References SoDebugError::postWarning(), and SbVec2f::setValue().

Referenced by SoSceneManager::setOrigin(), SoSceneManager::setSize(), and setViewportPixels().

void SbViewportRegion::setViewportPixels ( SbVec2s  origin,
SbVec2s  size 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

References SoDebugError::postWarning(), and setViewportPixels().

const SbVec2s & SbViewportRegion::getWindowSize ( void   )  const

Returns window dimensions (which are in absolute (i.e. pixel) coordinates).

See also:
setWindowSize().

Referenced by print(), SoSceneManager::setViewportRegion(), and SoCamera::viewAll().

const SbVec2f & SbViewportRegion::getViewportOrigin ( void   )  const

Return normalized viewport origin coordinates.

See also:
setViewport(), getViewportOriginPixels().

Referenced by print().

const SbVec2s & SbViewportRegion::getViewportOriginPixels ( void   )  const

const SbVec2f & SbViewportRegion::getViewportSize ( void   )  const

Returns the normalized viewport size.

See also:
setViewport(), getViewportSizePixels().

Referenced by print(), and SoCamera::viewAll().

const SbVec2s & SbViewportRegion::getViewportSizePixels ( void   )  const

float SbViewportRegion::getViewportAspectRatio ( void   )  const

Returns the aspect ratio of the viewport region. The aspect ratio is calculated as pixelwidth divided on pixelheight.

References getViewportSizePixels().

Referenced by SoCamera::getViewportBounds(), and print().

void SbViewportRegion::scaleWidth ( float  ratio  ) 

Scale the width of the viewport region.

The scale factor should not make the viewport larger than the window. If this happens, the viewport will be clamped.

The scaling will be done around the viewport region center point, but if this causes the viewport origin to be moved below (0,0), the origin coordinates will be clamped.

See also:
scaleHeight().

References SoDebugError::postWarning().

Referenced by SoCamera::getViewportBounds().

void SbViewportRegion::scaleHeight ( float  ratio  ) 

Scale the height of the viewport region.

The scale factor should not make the viewport larger than the window. If this happens, the viewport will be clamped.

The scaling will be done around the viewport region center point, but if this causes the viewport origin to be moved below (0,0), the origin coordinates will be clamped.

See also:
scaleWidth().

References SoDebugError::postWarning().

Referenced by SoCamera::getViewportBounds().

void SbViewportRegion::setPixelsPerInch ( float  ppi  ) 

Set pixels per inch. Default value is 72.

See also:
getPixelsPerInch().

References SoDebugError::postWarning().

float SbViewportRegion::getPixelsPerInch ( void   )  const

Get pixels per inch.

See also:
setPixelsPerInch().

Referenced by print().

float SbViewportRegion::getPixelsPerPoint ( void   )  const

Get pixels per point. A point is defined as something you can put 72 of per inch...

See also:
setPixelsPerInch(), getPixelsPerInch().

Referenced by print().

void SbViewportRegion::print ( FILE *  fp  )  const

Dump the state of this object to the file stream. Only works in debug version of library, method does nothing in an optimized compile.

References getPixelsPerInch(), getPixelsPerPoint(), getViewportAspectRatio(), getViewportOrigin(), getViewportOriginPixels(), getViewportSize(), getViewportSizePixels(), getWindowSize(), SbVec2f::print(), and SbVec2s::print().


Friends And Related Function Documentation

int operator== ( const SbViewportRegion reg1,
const SbViewportRegion reg2 
) [friend]

Compares two SbViewportRegion instances for equality.

int operator!= ( const SbViewportRegion reg1,
const SbViewportRegion reg2 
) [friend]

Compares two SbViewportRegion instances for inequality.

Since:
Coin 2.4


The documentation for this class was generated from the following files:

Copyright © 1998-2007 by Systems in Motion AS. All rights reserved.

Generated on Mon Feb 23 16:33:42 2009 for Coin by Doxygen. 1.5.8