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Updated event callback to be able to update iso surface value.

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This commit is contained in:
Robert Osfield 2009-01-17 17:23:47 +00:00
parent 71ee1a7047
commit 894b161878
1 changed files with 71 additions and 108 deletions
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179
examples/osgvolume/osgvolume.cpp
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@ -457,114 +457,6 @@ osg::Image* createTexture3D(ImageList& imageList, ProcessRow& processRow,
}
class FollowMouseCallback : public osgGA::GUIEventHandler, public osg::StateSet::Callback
{
public:
FollowMouseCallback(bool shader = false):
_shader(shader)
{
_updateTransparency = false;
_updateAlphaCutOff = false;
_updateSampleDensity = false;
}
FollowMouseCallback(const FollowMouseCallback&,const osg::CopyOp&) {}
META_Object(osg,FollowMouseCallback);
virtual void operator() (osg::StateSet* stateset, osg::NodeVisitor* nv)
{
if (nv->getVisitorType()==osg::NodeVisitor::EVENT_VISITOR)
{
osgGA::EventVisitor* ev = dynamic_cast<osgGA::EventVisitor*>(nv);
if (ev)
{
osgGA::GUIActionAdapter* aa = ev->getActionAdapter();
osgGA::EventQueue::Events& events = ev->getEvents();
for(osgGA::EventQueue::Events::iterator itr=events.begin();
itr!=events.end();
++itr)
{
handle(*(*itr), *aa, stateset, ev);
}
}
}
}
virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&, osg::Object* object, osg::NodeVisitor*)
{
osg::StateSet* stateset = dynamic_cast<osg::StateSet*>(object);
if (!stateset) return false;
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::MOVE):
case(osgGA::GUIEventAdapter::DRAG):
{
float v = (ea.getY()-ea.getYmin())/(ea.getYmax()-ea.getYmin());
if (_shader)
{
osg::Uniform* uniform = 0;
if (_updateTransparency && (uniform = stateset->getUniform("transparency"))) uniform->set(v);
if (_updateAlphaCutOff && (uniform = stateset->getUniform("alphaCutOff"))) uniform->set(v);
if (_updateSampleDensity && (uniform = stateset->getUniform("sampleDensity")))
{
float value = powf(v,5);
osg::notify(osg::INFO)<<"sampleDensity = "<<value<<std::endl;
uniform->set(value);
}
}
else
{
if (_updateAlphaCutOff)
{
osg::AlphaFunc* alphaFunc = dynamic_cast<osg::AlphaFunc*>(stateset->getAttribute(osg::StateAttribute::ALPHAFUNC));
if (alphaFunc)
{
alphaFunc->setReferenceValue(v);
}
}
if (_updateTransparency)
{
osg::Material* material = dynamic_cast<osg::Material*>(stateset->getAttribute(osg::StateAttribute::MATERIAL));
if (material)
{
material->setAlpha(osg::Material::FRONT_AND_BACK,v);
}
}
}
break;
}
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (ea.getKey()=='t') _updateTransparency = true;
if (ea.getKey()=='a') _updateAlphaCutOff = true;
if (ea.getKey()=='d') _updateSampleDensity = true;
break;
}
case(osgGA::GUIEventAdapter::KEYUP):
{
if (ea.getKey()=='t') _updateTransparency = false;
if (ea.getKey()=='a') _updateAlphaCutOff = false;
if (ea.getKey()=='d') _updateSampleDensity = false;
break;
}
default:
break;
}
return false;
}
bool _shader;
bool _updateTransparency;
bool _updateAlphaCutOff;
bool _updateSampleDensity;
};
struct ScaleOperator
{
ScaleOperator():_scale(1.0f) {}
@ -850,6 +742,75 @@ osg::TransferFunction1D* readTransferFunctionFile(const std::string& filename)
}
class FollowMouseCallback : public osgGA::GUIEventHandler, public osg::StateSet::Callback
{
public:
FollowMouseCallback()
{
_updateTransparency = false;
_updateAlphaCutOff = false;
_updateSampleDensity = false;
}
FollowMouseCallback(const FollowMouseCallback&,const osg::CopyOp&) {}
META_Object(osg,FollowMouseCallback);
virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&, osg::Object* object, osg::NodeVisitor*)
{
osgVolume::VolumeTile* tile = dynamic_cast<osgVolume::VolumeTile*>(object);
osgVolume::Layer* layer = tile ? tile->getLayer() : 0;
osgVolume::Property* property = layer ? layer->getProperty() : 0;
if (!property) return false;
osgVolume::CollectPropertiesVisitor cpv;
property->accept(cpv);
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::MOVE):
case(osgGA::GUIEventAdapter::DRAG):
{
float v = (ea.getY()-ea.getYmin())/(ea.getYmax()-ea.getYmin());
if (_updateAlphaCutOff && cpv._isoProperty.valid())
{
osg::notify(osg::NOTICE)<<"Setting isoProperty to "<<v<<std::endl;
cpv._isoProperty->setValue(v);
}
if (_updateAlphaCutOff && cpv._afProperty.valid())
{
cpv._afProperty->setValue(v);
}
}
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (ea.getKey()=='t') _updateTransparency = true;
if (ea.getKey()=='a') _updateAlphaCutOff = true;
if (ea.getKey()=='d') _updateSampleDensity = true;
break;
}
case(osgGA::GUIEventAdapter::KEYUP):
{
if (ea.getKey()=='t') _updateTransparency = false;
if (ea.getKey()=='a') _updateAlphaCutOff = false;
if (ea.getKey()=='d') _updateSampleDensity = false;
break;
}
default:
break;
}
return false;
}
bool _updateTransparency;
bool _updateAlphaCutOff;
bool _updateSampleDensity;
};
class TestSupportOperation: public osg::GraphicsOperation
{
public:
@ -1377,6 +1338,8 @@ int main( int argc, char **argv )
tile->setLayer(layer.get());
tile->setEventCallback(new FollowMouseCallback());
if (useShader)
{
switch(shadingModel)