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From Wang Rui, "I'd like to submit a small new feature to the osgmanipulator example

Browse Source 
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
"
This commit is contained in:
Robert Osfield 2011-01-14 12:08:46 +00:00
parent a4f9c19440
commit 942213dc85
1 changed files with 78 additions and 13 deletions
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91
examples/osgmanipulator/osgmanipulator.cpp
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@ -95,8 +95,63 @@ osgManipulator::Dragger* createDragger(const std::string& name)
return dragger;
}
// 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)
osg::Node* addDraggerToScene(osg::Node* scene, const std::string& name, bool fixedSizeInScreen)
{
scene->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
@ -105,11 +160,18 @@ osg::Node* addDraggerToScene(osg::Node* scene, const std::string& name)
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;
dragger->setMatrix(osg::Matrix::scale(scale, scale, scale) *
osg::Matrix::translate(scene->getBound().center()));
@ -130,7 +192,7 @@ osg::Node* addDraggerToScene(osg::Node* scene, const std::string& name)
return root;
}
osg::Node* createDemoScene() {
osg::Node* createDemoScene(bool fixedSizeInScreen) {
osg::Group* root = new osg::Group;
@ -206,13 +268,13 @@ osg::Node* createDemoScene() {
matirial->setShininess(osg::Material::FRONT_AND_BACK, 64.0f);
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());
root->addChild(transform_2.get());
@ -244,7 +306,10 @@ int main( int argc, char **argv )
arguments.getApplicationUsage()->addCommandLineOption("--help-all","Display all command line, env vars and keyboard & mouse bindings.");
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.
osgViewer::Viewer viewer;
@ -284,7 +349,7 @@ int main( int argc, char **argv )
{
//std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
//return 1;
loadedModel = createDemoScene();
loadedModel = createDemoScene(fixedSizeInScreen);
tragger2Scene=false;
}
@ -309,7 +374,7 @@ int main( int argc, char **argv )
// 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());
}