void
SoBoxSelectionRenderAction::drawBoxes(SoPath * pathtothis, const SoPathList * pathlist)
{
int i;
int thispos = ((SoFullPath *)pathtothis)->getLength()-1;
assert(thispos >= 0);
PRIVATE(this)->postprocpath->truncate(0); // reset
for (i = 0; i < thispos; i++)
PRIVATE(this)->postprocpath->append(pathtothis->getNode(i));
// we need to disable accumulation buffer antialiasing while
// rendering selected objects
int oldnumpasses = this->getNumPasses();
this->setNumPasses(1);
SoState * thestate = this->getState();
thestate->push();
for (i = 0; i < pathlist->getLength(); i++) {
SoFullPath * path = (SoFullPath *)(*pathlist)[i];
for (int j = 0; j < path->getLength(); j++) {
PRIVATE(this)->postprocpath->append(path->getNode(j));
}
// Previously SoGLRenderAction was used to draw the bounding boxes
// of shapes in selection paths, by overriding renderstyle state
// elements to lines drawstyle and simply doing:
//
// SoGLRenderAction::apply(PRIVATE(this)->postprocpath); // Bug
//
// This could have the unwanted side effect of rendering
// non-selected shapes, as they could be part of the path (due to
// being placed below SoGroup nodes (instead of SoSeparator
// nodes)) up to the selected shape.
//
//
// A better approach turned out to be to soup up and draw only the
// bounding boxes of the selected shapes:
PRIVATE(this)->updateBbox(PRIVATE(this)->postprocpath);
// Remove temporary path from path buffer
PRIVATE(this)->postprocpath->truncate(thispos);
}
this->setNumPasses(oldnumpasses);
thestate->pop();
}
//////////////////////////////////////////////////////////////////////////////
//
// beginTraversal - have the base class render the passed scene graph,
// then render highlights for our selection node.
//
void
SoLineHighlightRenderAction::apply(SoNode *node)
//
//////////////////////////////////////////////////////////////////////////////
{
// Render the scene
SoGLRenderAction::apply(node);
// Render the highlight?
if (! hlVisible) return;
// Add the rendering localRoot beneath our local scene graph localRoot
// so that we can find a path from localRoot to the selection node
// which is under the render root.
localRoot->addChild(node);
// Find the selection node under the local root
static SoSearchAction *sa = NULL;
if (sa == NULL)
sa = new SoSearchAction;
else
sa->reset();
sa->setFind(SoSearchAction::TYPE);
sa->setInterest(SoSearchAction::FIRST);
sa->setType(SoSelection::getClassTypeId());
sa->apply(localRoot);
SoPath *hlPath = sa->getPath();
if (hlPath != NULL) {
hlPath = hlPath->copy();
hlPath->ref();
// Make sure something is selected
SoSelection *sel = (SoSelection *) hlPath->getTail();
if (sel->getNumSelected() > 0) {
// Keep the length from the root to the selection
// as an optimization so we can reuse this data
int reusablePathLength = hlPath->getLength();
// For each selection path, create a new path rooted under our localRoot
for (int j = 0; j < sel->getNumSelected(); j++) {
// Continue the path down to the selected object.
// No need to deal with p[0] since that is the sel node.
SoFullPath *p = (SoFullPath *) sel->getPath(j);
SoNode *pathTail = p->getTail();
if ( pathTail->isOfType(SoBaseKit::getClassTypeId())) {
// Find the last nodekit on the path.
SoNode *kitTail = ((SoNodeKitPath *)p)->getTail();
// Extend the selectionPath until it reaches this last kit.
SoFullPath *fp = (SoFullPath *) p;
int k = 0;
do {
hlPath->append(fp->getIndex(++k));
}
while ( fp->getNode(k) != kitTail );
}
else {
for (int k = 1; k < p->getLength(); k++)
hlPath->append(p->getIndex(k));
}
// Render the shape with the local draw style to make the highlight
SoGLRenderAction::apply(hlPath);
// Restore hlPath for reuse
hlPath->truncate(reusablePathLength);
}
}
hlPath->unref();
}
// Remove the rendering localRoot from our local scene graph
localRoot->removeChild(node);
}
//////////////////////////////////////////////////////////////////////////////
//
// beginTraversal - have the base class render the passed scene graph,
// then render highlights for our selection node.
//
void
SoBoxHighlightRenderAction::apply(SoNode *renderRoot)
//
//////////////////////////////////////////////////////////////////////////////
{
// Render the scene
SoGLRenderAction::apply(renderRoot);
// Render the highlight?
if (! hlVisible) return;
// Is our cached path still valid?
if ((selPath == NULL) ||
(selPath->getHead() != renderRoot) ||
(! selPath->getTail()->isOfType(SoSelection::getClassTypeId()))) {
// Find the selection node under the render root
static SoSearchAction *sa1 = NULL;
if (sa1 == NULL)
sa1 = new SoSearchAction;
else
sa1->reset();
sa1->setFind(SoSearchAction::TYPE);
sa1->setInterest(SoSearchAction::FIRST);
sa1->setType(SoSelection::getClassTypeId());
sa1->apply(renderRoot);
// Cache this path
if (selPath != NULL)
selPath->unref();
selPath = sa1->getPath();
if (selPath != NULL) {
selPath = selPath->copy();
selPath->ref();
}
}
if (selPath != NULL) {
// Make sure something is selected
SoSelection *sel = (SoSelection *) selPath->getTail();
if (sel->getNumSelected() == 0) return;
// Keep the length from the root to the selection
// as an optimization so we can reuse this data
int reusablePathLength = selPath->getLength();
// For each selection path, create a new path rooted under our
// localRoot
for (int j = 0; j < sel->getNumSelected(); j++) {
// Continue the path down to the selected object.
// No need to deal with p[0] since that is the sel node.
SoFullPath *p = (SoFullPath *) sel->getPath(j);
SoNode *pathTail = p->getTail();
if ( pathTail->isOfType(SoBaseKit::getClassTypeId())) {
// Find the last nodekit on the path.
SoNode *kitTail = ((SoNodeKitPath *)p)->getTail();
// Extend the selectionPath until it reaches this last kit.
SoFullPath *fp = (SoFullPath *) p;
int k = 0;
do {
selPath->append(fp->getIndex(++k));
}
while ( fp->getNode(k) != kitTail );
}
else {
for (int k = 1; k < p->getLength(); k++)
selPath->append(p->getIndex(k));
}
// Find the camera used to render the selected object and
// insert it into the highlight graph as the first child
SoNode *camera;
static SoSearchAction *sa2 = NULL;
if (sa2 == NULL)
sa2 = new SoSearchAction;
else
sa2->reset();
sa2->setFind(SoSearchAction::TYPE);
sa2->setInterest(SoSearchAction::LAST);
sa2->setType(SoCamera::getClassTypeId());
sa2->apply(selPath);
camera =(sa2->getPath() == NULL ? NULL : sa2->getPath()->getTail());
if (camera != NULL)
localRoot->insertChild(camera, 0);
// Get the bounding box of the object and update the
// local highlight graph
updateBbox(selPath);
// Make sure the box has some size
if ((cube->width.getValue() == 0) &&
(cube->height.getValue() == 0) &&
(cube->depth.getValue() == 0)) {
#ifdef DEBUG
SoDebugError::postWarning("SoBoxHighlightRenderAction::apply",
"selected object has no bounding box - no highlight rendered");
#endif
}
else {
// Render the highlight
SoGLRenderAction::apply(localRoot);
}
// Restore selPath for reuse
selPath->truncate(reusablePathLength);
// Remove the camera for the next path
if (camera != NULL)
localRoot->removeChild(0);
}
}
}