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SbViewportRegion.3coin2

NAME

SbViewportRegion -

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.

SYNOPSIS

#include <Inventor/SbViewportRegion.h>

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 SbVec2s & getWindowSize (void) const

const SbVec2f & getViewportOrigin (void) const

const SbVec2s & getViewportOriginPixels (void) const

const SbVec2f & getViewportSize (void) const

const SbVec2s & getViewportSizePixels (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) constReturns 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) constReturn normalized viewport origin coordinates.

See also:

setViewport(), getViewportOriginPixels().

Referenced by print().

const SbVec2s & SbViewportRegion::getViewportOriginPixels (void) constReturn viewport origin coordinates in pixel values.

See also:

setViewportPixels(), getViewportOrigin().

References SbVec2s::setValue().

Referenced by SoRayPickAction::computeWorldSpaceRay(), SoEvent::getNormalizedPosition(), SoEvent::getPosition(), SoExtSelection::GLRenderBelowPath(), print(), SoSceneManager::setSize(), and SoSceneManager::setViewportRegion().

const SbVec2f & SbViewportRegion::getViewportSize (void) constReturns the normalized viewport size.

See also:

setViewport(), getViewportSizePixels().

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

const SbVec2s & SbViewportRegion::getViewportSizePixels (void) constReturns viewport size in pixel coordinates.

See also:

setViewportPixels(), getViewportSize().

Referenced by SoVectorizeAction::calibrate(), SoRayPickAction::computeWorldSpaceRay(), SoEvent::getNormalizedPosition(), getViewportAspectRatio(), SoText2::GLRender(), SoMarkerSet::GLRender(), SoImage::GLRender(), SoExtSelection::GLRenderBelowPath(), SoCamera::jitter(), print(), SoTabPlaneDragger::reallyAdjustScaleTabSize(), SoSceneManager::setOrigin(), and SoSceneManager::setViewportRegion().

float SbViewportRegion::getViewportAspectRatio (void) constReturns 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) constGet pixels per inch.

See also:

setPixelsPerInch().

Referenced by print().

float SbViewportRegion::getPixelsPerPoint (void) constGet 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) constDump 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().

Author

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