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       SoImage -

       The SoImage class draws a 2D image on the viewport.

       An image can be specified either by using the image field, or by specifying a filename. If
       width and or height is specified, the image will be resized to match those values before
       it is displayed.


       #include <Inventor/nodes/SoImage.h>

       Inherits SoShape.

   Public Types
       enum VertAlignment { BOTTOM, HALF, TOP }
       enum HorAlignment { LEFT, CENTER, RIGHT }

   Public Member Functions
       SoImage (void)
       virtual void GLRender (SoGLRenderAction *action)
       virtual void rayPick (SoRayPickAction *action)
       virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

   Static Public Member Functions
       static void initClass (void)

   Public Attributes
       SoSFInt32 width
       SoSFInt32 height
       SoSFEnum vertAlignment
       SoSFEnum horAlignment
       SoSFImage image
       SoSFString filename

   Protected Member Functions
       virtual ~SoImage ()
       virtual void generatePrimitives (SoAction *action)
       virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)
       virtual SbBool readInstance (SoInput *in, unsigned short flags)
       virtual void notify (SoNotList *list)
       int getReadStatus (void)
       void setReadStatus (SbBool flag)

Detailed Description

       The SoImage class draws a 2D image on the viewport.

       An image can be specified either by using the image field, or by specifying a filename. If
       width and or height is specified, the image will be resized to match those values before
       it is displayed.

       The current modelview matrix will be used to find the viewport position, and the image is
       rendered in that position, with z-buffer testing activated.

       Here's a simple, stand-alone example on how to set up and show an SoImage:

         #include <stdlib.h>
         #include <Inventor/Qt/SoQt.h>
         #include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
         #include <Inventor/nodes/SoSeparator.h>
         #include <Inventor/nodes/SoCamera.h>
         #include <Inventor/nodes/SoCube.h>
         #include <Inventor/nodes/SoImage.h>

         static void
         mandel(double sr, double si, double width, double height,
                int bwidth, int bheight, int mult, unsigned char * bmp, int n)
           double zr, zr_old, zi, cr, ci;
           int w;

           for (int y=0; y<bheight; y++)
             for (int x=0; x<bwidth; x++) {
               cr = ((double)(x)/(double)(bwidth))*width+sr;
               ci = ((double)(y)/(double)(bheight))*height+si;
               zr = zi = 0.0;
               for (w = 0; (w < n) && (zr*zr + zi*zi)<n; w++) {
                 zr_old = zr;
                 zr = zr*zr - zi*zi + cr;
                 zi = 2*zr_old*zi + ci;
               bmp[y*bwidth+x] = w*mult;

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

           SoSeparator * root = new SoSeparator;

           const int IMGWIDTH = 256;
           const int IMGHEIGHT = 256;
           unsigned char * img = new unsigned char[IMGWIDTH * IMGHEIGHT];
           mandel(-0.5, 0.6, 0.025, 0.025, IMGWIDTH, IMGHEIGHT, 1, img, 256);

           SoImage * nimage = new SoImage;
           nimage->vertAlignment = SoImage::HALF;
           nimage->horAlignment = SoImage::CENTER;
           nimage->image.setValue(SbVec2s(IMGWIDTH, IMGHEIGHT), 1, img);

           SoCube * cube = new SoCube;


           SoQtExaminerViewer * viewer = new SoQtExaminerViewer(mainwin);
           viewer->setTitle('SoImage use');

           SoCamera * cam = viewer->getCamera();
           cam->position = SbVec3f(0, 0, 50);
           cam->focalDistance = 50;


           delete viewer;
           delete img;
           return 0;

       Note that an SoImage node in the scene graph will have it's positioning / rendering
       influenced by the current viewport and camera. This has important implications for how to
       layout your scene graph for the best possible rendering performance. See the note about
       this issue in the SoText2 class documentation.

       SoScale nodes can not be used to influence the dimensions of the rendering output of
       SoImage nodes.


           Image {
               width -1
               height -1
               vertAlignment BOTTOM
               horAlignment LEFT
               image 0 0 0

               filename ''

           TGS Inventor 2.5

           Coin 1.0

Member Enumeration Documentation

   enum SoImage::VertAlignment Vertical alignment for image.

       BOTTOM Vertical alignment at bottom of image.

       HALF   Vertical alignment at center of image.

       TOP    Vertical alignment at top of image.

   enum SoImage::HorAlignment Horizontal alignment for image.

       LEFT   Horizontal alignment at left border.

       CENTER Horizontal alignment at center of image.

       RIGHT  Horizontal alignment ar right border.

Constructor & Destructor Documentation

   SoImage::SoImage (void) Constructor.
   SoImage::~SoImage () [protected, virtual] Destructor.

Member Function Documentation

   void SoImage::initClass (void) [static] Sets up initialization for data common to all
       instances of this class, like submitting necessary information to the Coin type system.
       Reimplemented from SoShape.

   void SoImage::GLRender (SoGLRenderAction *action) [virtual] Action method for the
       This is called during rendering traversals. Nodes influencing the rendering state in any
       way or who wants to throw geometry primitives at OpenGL overrides this method.

       Reimplemented from SoShape.

   void SoImage::rayPick (SoRayPickAction *action) [virtual] Calculates picked point based on
       primitives generated by subclasses.
       Reimplemented from SoShape.

   void SoImage::getPrimitiveCount (SoGetPrimitiveCountAction *action) [virtual] Action method
       for the SoGetPrimitiveCountAction.
       Calculates the number of triangle, line segment and point primitives for the node and adds
       these to the counters of the action.

       Nodes influencing how geometry nodes calculates their primitive count also overrides this
       method to change the relevant state variables.

       Reimplemented from SoShape.

   void SoImage::generatePrimitives (SoAction *action) [protected, virtual] Will generate a
       textured quad, representing the image in 3D.
       Implements SoShape.

   void SoImage::computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center) [protected,
       virtual] Implemented by SoShape subclasses to let the SoShape superclass know the exact
       size and weighted center point of the shape's bounding box.
       The bounding box and center point should be calculated and returned in the local
       coordinate system.

       The method implements action behavior for shape nodes for SoGetBoundingBoxAction. It is
       invoked from SoShape::getBoundingBox(). (Subclasses should not override

       The box parameter sent in is guaranteed to be an empty box, while center is undefined upon
       function entry.

       Implements SoShape.

   SbBool SoImage::readInstance (SoInput *in, unsigned shortflags) [protected, virtual] This
       method is mainly intended for internal use during file import operations.
       It reads a definition of an instance from the input stream in. The input stream state
       points to the start of a serialized / persistant representation of an instance of this
       class type.

       TRUE or FALSE is returned, depending on if the instantiation and configuration of the new
       object of this class type went ok or not. The import process should be robust and handle
       corrupted input streams by returning FALSE.

       flags is used internally during binary import when reading user extension nodes, group
       nodes or engines.

       Reimplemented from SoNode.

   void SoImage::notify (SoNotList *l) [protected, virtual] Notifies all auditors for this
       instance when changes are made.
       Reimplemented from SoShape.

   int SoImage::getReadStatus (void) [protected] Returns TRUE if node was read ok.
   void SoImage::setReadStatus (SbBoolflag) [protected] Set read status for this node.

Member Data Documentation

   SoSFInt32 SoImage::width If bigger than 0, resize image to this width before rendering.
       Default value is -1 (ie 'don't resize').
   SoSFInt32 SoImage::height If bigger than 0, resize image to this height before rendering.
       Default value is -1 (ie 'don't resize').
   SoSFEnum SoImage::vertAlignment Vertical alignment. Default value is SoImage::BOTTOM.
   SoSFEnum SoImage::horAlignment Horizontal alignment. Default value is SoImage::LEFT.
   SoSFImage SoImage::image Inline image data. Default empty.
   SoSFString SoImage::filename Image filename. Default empty.


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