SoSlection Pick Filter Manipulator

/*------------------------------------------------------------- * This example demonstrates the use of the pick filter * callback to pick through manipulators. * * The scene graph has several objects. Clicking the left * mouse on an object selects it and adds a manipulator to * it. Clicking again deselects it and removes the manipulator. * In this case, the pick filter is needed to deselect the * object rather than select the manipulator. *------------------------------------------------------------*/ #include <Inventor/SoDB.h> #include <Inventor/SoInput.h> #include <Inventor/SoPath.h> #include <Inventor/SoPickedPoint.h> #include <Inventor/Win/SoWin.h> #include <Inventor/Win/viewers/SoWinExaminerViewer.h> #include <Inventor/manips/SoHandleBoxManip.h> #include <Inventor/nodes/SoBaseColor.h> #include <Inventor/nodes/SoFont.h> #include <Inventor/nodes/SoNode.h> #include <Inventor/nodes/SoSelection.h> #include <Inventor/nodes/SoSeparator.h> #include <Inventor/nodes/SoText3.h> #include <Inventor/nodes/SoTransform.h> // Returns path to xform left of the input path tail. // Inserts the xform if none found. In this example, // assume that the xform is always the node preceeding // the selected shape. SoPath * findXform(SoPath *p) { SoPath *returnPath; // Copy the input path up to tail's parent. returnPath = p->copy(0, p->getLength() - 1); // Get the parent of the selected shape SoGroup *g = (SoGroup *) p->getNodeFromTail(1); int tailNodeIndex = p->getIndexFromTail(0); // Check if there is already a transform node if (tailNodeIndex > 0) { SoNode *n = g->getChild(tailNodeIndex - 1); if (n->isOfType(SoTransform::getClassTypeId())) { // Append to returnPath and return it. returnPath->append(n); return returnPath; } } // Otherwise, add a transform node. SoTransform *xf = new SoTransform; g->insertChild(xf, tailNodeIndex); // right before the tail // Append to returnPath and return it. returnPath->append(xf); return returnPath; } // Returns the manip affecting this path. In this example, // the manip is always preceeding the selected shape. SoPath * findManip(SoPath *p) { SoPath *returnPath; // Copy the input path up to tail's parent. returnPath = p->copy(0, p->getLength() - 1); // Get the index of the last node in the path. int tailNodeIndex = p->getIndexFromTail(0); // Append the left sibling of the tail to the returnPath returnPath->append(tailNodeIndex - 1); return returnPath; } // Add a manipulator to the transform affecting this path // The first parameter, userData, is not used. void selCB(void *, SoPath *path) { if (path->getLength() < 2) return; // Find the transform affecting this object SoPath *xfPath = findXform(path); xfPath->ref(); // Replace the transform with a manipulator SoHandleBoxManip *manip = new SoHandleBoxManip; manip->ref(); manip->replaceNode(xfPath); // Unref the xfPath xfPath->unref(); } // Remove the manipulator affecting this path. // The first parameter, userData, is not used. void deselCB(void *, SoPath *path) { if (path->getLength() < 2) return; // Find the manipulator affecting this object SoPath *manipPath = findManip(path); manipPath->ref(); // Replace the manipulator with a transform SoTransformManip *manip = (SoTransformManip *) manipPath->getTail(); manip->replaceManip(manipPath, new SoTransform); manip->unref(); // Unref the manipPath manipPath->unref(); } ////////////////////////////////////////////////////////////// // CODE FOR The Inventor Mentor STARTS HERE (part 1) SoPath * pickFilterCB(void *, const SoPickedPoint *pick) { SoPath *filteredPath = NULL; // See if the picked object is a manipulator. // If so, change the path so it points to the object the manip // is attached to. SoPath *p = pick->getPath(); SoNode *n = p->getTail(); if (n->isOfType(SoTransformManip::getClassTypeId())) { // Manip picked! We know the manip is attached // to its next sibling. Set up and return that path. int manipIndex = p->getIndex(p->getLength() - 1); filteredPath = p->copy(0, p->getLength() - 1); filteredPath->append(manipIndex + 1); // get next sibling } else filteredPath = p; return filteredPath; } // CODE FOR The Inventor Mentor ENDS HERE /////////////////////////////////////////////////////////////// // Create a sample scene graph SoNode * myText(char *str, int i, const SbColor &color) { SoSeparator *sep = new SoSeparator; SoBaseColor *col = new SoBaseColor; SoTransform *xf = new SoTransform; SoText3 *text = new SoText3; col->rgb = color; xf->translation.setValue(6.0f*i, 0.0f, 0.0f); text->string = str; text->parts = (SoText3::FRONT | SoText3::SIDES); text->justification = SoText3::CENTER; sep->addChild(col); sep->addChild(xf); sep->addChild(text); return sep; } SoNode * buildScene() { SoSeparator *scene = new SoSeparator; SoFont *font = new SoFont; font->size = 10; scene->addChild(font); scene->addChild(myText("O", 0, SbColor(0.0f, 0.0f, 1.0f))); scene->addChild(myText("p", 1, SbColor(0.0f, 1.0f, 0.0f))); scene->addChild(myText("e", 2, SbColor(0.0f, 1.0f, 1.0f))); scene->addChild(myText("n", 3, SbColor(1.0f, 0.0f, 0.0f))); // Open Inventor is two words! scene->addChild(myText("I", 5, SbColor(1.0f, 0.0f, 1.0f))); scene->addChild(myText("n", 6, SbColor(1.0f, 1.0f, 0.0f))); scene->addChild(myText("v", 7, SbColor(1.0f, 1.0f, 1.0f))); scene->addChild(myText("e", 8, SbColor(0.0f, 0.0f, 1.0f))); scene->addChild(myText("n", 9, SbColor(0.0f, 1.0f, 0.0f))); scene->addChild(myText("t", 10, SbColor(0.0f, 1.0f, 1.0f))); scene->addChild(myText("o", 11, SbColor(1.0f, 0.0f, 0.0f))); scene->addChild(myText("r", 12, SbColor(1.0f, 0.0f, 1.0f))); return scene; } int main(int, char **argv) { // Initialization HWND mainWindow = SoWin::init(argv[0]); // Create a scene graph. Use the toggle selection policy. SoSelection *sel = new SoSelection; sel->ref(); sel->policy.setValue(SoSelection::TOGGLE); sel->addChild(buildScene()); // Create a viewer SoWinExaminerViewer *viewer = new SoWinExaminerViewer(mainWindow); viewer->setSceneGraph(sel); viewer->setTitle("Select Through Manips"); viewer->show(); // Selection callbacks sel->addSelectionCallback(selCB); sel->addDeselectionCallback(deselCB); //sel->setPickFilterCallback(pickFilterCB); SoWin::show(mainWindow); SoWin::mainLoop(); return 0; }