Changeset 12088 for OpenSceneGraph/trunk/examples/osgmanipulator/osgmanipulator.cpp

Timestamp:

01/14/11 13:08:46 (2 years ago)

Author:

robert

Message:

From Wang Rui, "I'd like to submit a small new feature to the osgmanipulator example
which could fix the dragger size in screen, so that no matter how we
zoom in/out the camera, the dragger will never be scaled.

This is what 3D graphics software like 3dsmax and maya behave, which
helps users select and manipulate draggers more easily.

You may turn on the feature with the new --fixedDraggerSize argument:

# osgmanipulator.exe --fixedDraggerSize --dragger TranslateAxisDragger?
cessna.osg
"

Files:

• OpenSceneGraph/trunk/examples/osgmanipulator/osgmanipulator.cpp (modified) (7 diffs)

OpenSceneGraph/trunk/examples/osgmanipulator/osgmanipulator.cpp

@@ -96 +96 @@
 }
 
-
-osg::Node* addDraggerToScene(osg::Node* scene, const std::string& name)
+// The DraggerContainer node is used to fix the dragger's size on the screen
+class DraggerContainer : public osg::Group
+{
+public:
+    DraggerContainer() : _draggerSize(240.0f), _active(true) {}
+    
+    DraggerContainer( const DraggerContainer& copy, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY )
+    :   osg::Group(copy, copyop),
+        _dragger(copy._dragger), _draggerSize(copy._draggerSize), _active(copy._active)
+    {}
+    
+    META_Node( osgManipulator, DraggerContainer );
+    
+    void setDragger( osgManipulator::Dragger* dragger )
+    {
+        _dragger = dragger;
+        if ( !containsNode(dragger) ) addChild( dragger );
+    }
+    
+    osgManipulator::Dragger* getDragger() { return _dragger.get(); }
+    const osgManipulator::Dragger* getDragger() const { return _dragger.get(); }
+    
+    void setDraggerSize( float size ) { _draggerSize = size; }
+    float getDraggerSize() const { return _draggerSize; }
+    
+    void setActive( bool b ) { _active = b; }
+    bool getActive() const { return _active; }
+    
+    void traverse( osg::NodeVisitor& nv )
+    {
+        if ( _dragger.valid() )
+        {
+            if ( _active && nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR )
+            {
+                osgUtil::CullVisitor* cv = static_cast<osgUtil::CullVisitor*>(&nv);
+                
+                float pixelSize = cv->pixelSize(_dragger->getBound().center(), 0.48f);
+                if ( pixelSize!=_draggerSize )
+                {
+                    float pixelScale = pixelSize>0.0f ? _draggerSize/pixelSize : 1.0f;
+                    osg::Vec3d scaleFactor(pixelScale, pixelScale, pixelScale);
+                    
+                    osg::Vec3 trans = _dragger->getMatrix().getTrans();
+                    _dragger->setMatrix( osg::Matrix::scale(scaleFactor) * osg::Matrix::translate(trans) );
+                }
+            }
+        }
+        osg::Group::traverse(nv);
+    }
+    
+protected:
+    osg::ref_ptr<osgManipulator::Dragger> _dragger;
+    float _draggerSize;
+    bool _active;
+};
+
+osg::Node* addDraggerToScene(osg::Node* scene, const std::string& name, bool fixedSizeInScreen)
 {
     scene->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
@@ -106 +161 @@
     osgManipulator::Dragger* dragger = createDragger(name);
 
-
     osg::Group* root = new osg::Group;
-    root->addChild(dragger);
     root->addChild(selection);
+
+    if ( fixedSizeInScreen )
+    {
+        DraggerContainer* draggerContainer = new DraggerContainer;
+        draggerContainer->setDragger( dragger );
+        root->addChild(draggerContainer);
+    }
+    else
+        root->addChild(dragger);
 
     float scale = scene->getBound().radius() * 1.6;
@@ -131 +193 @@
 }
 
-osg::Node* createDemoScene() {
+osg::Node* createDemoScene(bool fixedSizeInScreen) {
  
     osg::Group* root = new osg::Group;
@@ -207 +269 @@
     root->getOrCreateStateSet()->setAttributeAndModes(matirial.get(), osg::StateAttribute::ON);
 
-      transform_1.get()->addChild(addDraggerToScene(geode_1.get(),"TabBoxDragger"));
-    transform_2.get()->addChild(addDraggerToScene(geode_2.get(),"TabPlaneDragger"));
-    transform_3.get()->addChild(addDraggerToScene(geode_3.get(),"TabBoxTrackballDragger"));
-    transform_4.get()->addChild(addDraggerToScene(geode_4.get(),"TrackballDragger"));
-    transform_5.get()->addChild(addDraggerToScene(geode_5.get(),"Translate1DDragger"));
-    transform_6.get()->addChild(addDraggerToScene(geode_6.get(),"Translate2DDragger"));
-    transform_7.get()->addChild(addDraggerToScene(geode_7.get(),"TranslateAxisDragger"));
+      transform_1.get()->addChild(addDraggerToScene(geode_1.get(),"TabBoxDragger",fixedSizeInScreen));
+    transform_2.get()->addChild(addDraggerToScene(geode_2.get(),"TabPlaneDragger",fixedSizeInScreen));
+    transform_3.get()->addChild(addDraggerToScene(geode_3.get(),"TabBoxTrackballDragger",fixedSizeInScreen));
+    transform_4.get()->addChild(addDraggerToScene(geode_4.get(),"TrackballDragger",fixedSizeInScreen));
+    transform_5.get()->addChild(addDraggerToScene(geode_5.get(),"Translate1DDragger",fixedSizeInScreen));
+    transform_6.get()->addChild(addDraggerToScene(geode_6.get(),"Translate2DDragger",fixedSizeInScreen));
+    transform_7.get()->addChild(addDraggerToScene(geode_7.get(),"TranslateAxisDragger",fixedSizeInScreen));
 
     root->addChild(transform_1.get());
@@ -245 +307 @@
 
     arguments.getApplicationUsage()->addCommandLineOption("--dragger <draggername>","Use the specified dragger for manipulation [TabPlaneDragger,TabPlaneTrackballDragger,TrackballDragger,Translate1DDragger,Translate2DDragger,TranslateAxisDragger,TabBoxDragger]");
-    
+    arguments.getApplicationUsage()->addCommandLineOption("--fixedDraggerSize","Fix the size of the dragger geometry in the screen space");
+    
+    bool fixedSizeInScreen = false;
+    while (arguments.read("--fixedDraggerSize")) { fixedSizeInScreen = true; }
 
     // construct the viewer.
@@ -285 +350 @@
         //std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
         //return 1;
-        loadedModel = createDemoScene();
+        loadedModel = createDemoScene(fixedSizeInScreen);
         tragger2Scene=false;
     }
@@ -310 +375 @@
     // pass the loaded scene graph to the viewer.
     if ( tragger2Scene ) {
-        viewer.setSceneData(addDraggerToScene(loadedModel.get(), dragger_name));
+        viewer.setSceneData(addDraggerToScene(loadedModel.get(), dragger_name, fixedSizeInScreen));
     } else { 
         viewer.setSceneData(loadedModel.get());