SoRayPickAction SoEventCallback

/*------------------------------------------------------------ * Example of setting up pick actions and using the pick path. * A couple of objects are displayed. The program catches * mouse button events and determines the mouse position. * A pick action is applied and if an object is picked the * pick path is printed to stdout. *-----------------------------------------------------------*/ #include <Inventor/SbViewportRegion.h> #include <Inventor/SoDB.h> #include <Inventor/SoInput.h> #include <Inventor/SoPickedPoint.h> #include <Inventor/Win/SoWin.h> #include <Inventor/Win/viewers/SoWinExaminerViewer.h> #include <Inventor/actions/SoRayPickAction.h> #include <Inventor/actions/SoWriteAction.h> #include <Inventor/events/SoMouseButtonEvent.h> #include <Inventor/nodes/SoEventCallback.h> #include <Inventor/nodes/SoMaterial.h> #include <Inventor/nodes/SoRotationXYZ.h> #include <Inventor/nodes/SoSeparator.h> #include <Inventor/nodes/SoTranslation.h> #include <stdlib.h> #ifdef WIN32 # include "print.h" #endif #ifdef WIN32 static SoOutput *conOut; #endif /////////////////////////////////////////////////////////////// // CODE FOR The Inventor Mentor STARTS HERE SbBool writePickedPath(SoNode *root, const SbViewportRegion &viewport, const SbVec2s &cursorPosition) { SoRayPickAction myPickAction(viewport); // Set an 8-pixel wide region around the pixel myPickAction.setPoint(cursorPosition); myPickAction.setRadius(8.0); // Start a pick traversal myPickAction.apply(root); const SoPickedPoint *myPickedPoint = myPickAction.getPickedPoint(); if (myPickedPoint == NULL) return FALSE; // Write out the path to the picked object #ifdef WIN32 SoWriteAction myWriteAction(conOut); #else SoWriteAction myWriteAction; #endif myWriteAction.apply(myPickedPoint->getPath()); //#ifdef WIN32 // conOut->flushFile(); //#endif return TRUE; } // CODE FOR The Inventor Mentor ENDS HERE /////////////////////////////////////////////////////////////// // This routine is called for every mouse button event. void myMousePressCB(void *userData, SoEventCallback *eventCB) { SoSeparator *root = (SoSeparator *) userData; const SoEvent *event = eventCB->getEvent(); // Check for mouse button being pressed if (SO_MOUSE_PRESS_EVENT(event, ANY)) { const SbViewportRegion &myRegion = eventCB->getAction()->getViewportRegion(); writePickedPath(root, myRegion, event->getPosition(myRegion)); eventCB->setHandled(); } } int main(int, char **argv) { // Initialize Inventor and Win HWND myWindow = SoWin::init(argv[0]); SoMouseButtonEvent myMouseEvent; #ifdef WIN32 conOut = new SoOutput; conOut->setFilePointer(__AllocConsole()); #endif if (myWindow == NULL) exit(1); SoSeparator *root = new SoSeparator; root->ref(); // Add an event callback to catch mouse button presses. // The callback is set up later on. SoEventCallback *myEventCB = new SoEventCallback; root->addChild(myEventCB); // Read object data from a file SoInput mySceneInput; if (!mySceneInput.openFile("../data/star.iv")) exit (1); SoSeparator *starObject = SoDB::readAll(&mySceneInput); if (starObject == NULL) exit (1); mySceneInput.closeFile(); // Add two copies of the star object, one white and one red SoRotationXYZ *myRotation = new SoRotationXYZ; myRotation->axis.setValue(SoRotationXYZ::X); myRotation->angle.setValue((float)(M_PI/2.2f)); // almost 90 degrees root->addChild(myRotation); root->addChild(starObject); // first star object SoMaterial *myMaterial = new SoMaterial; myMaterial->diffuseColor.setValue(1.0f, 0.0f, 0.0f); // red root->addChild(myMaterial); SoTranslation *myTranslation = new SoTranslation; myTranslation->translation.setValue(1.0f, 0.0f, 1.0f); root->addChild(myTranslation); root->addChild(starObject); // second star object // Create a render area in which to see our scene graph. SoWinExaminerViewer *myViewer = new SoWinExaminerViewer(myWindow); // Turn off viewing to allow picking myViewer->setViewing(FALSE); myViewer->setSceneGraph(root); myViewer->setTitle("Pick Actions & Paths"); myViewer->show(); // Set up the event callback. We want to pass the root of the // entire scene graph (including the camera) as the userData, // so we get the scene manager's version of the scene graph // root. myEventCB->addEventCallback(SoMouseButtonEvent::getClassTypeId(), myMousePressCB, myViewer->getSceneManager()->getSceneGraph()); SoWin::show(myWindow); SoWin::mainLoop(); return 0; }