[osg-users] Update node color on demand

[Eran Cohen]

Hi,
To respond to user events you can either inherit from osg::Callback and install it on your node as an EventCallback:


Code:

class ColorCallback : public osg::Callback
{
public:
	virtual bool run(osg::Object* object, osg::Object* data) override
	{
		auto nv = dynamic_cast<osg::NodeVisitor*>(data);
		if (nv != nullptr && nv->getVisitorType() == nv->EVENT_VISITOR)
		{
			auto events = nv->asEventVisitor()->getEvents();
			for (auto event : events)
			{
				// handle events
			}
		}

		return traverse(object, data);
	}
};

_lines->addEventCallback(new ColorCallback);




or use a global EventHandler and install it on your Viewer:

Code:

class ColorHandler : public osgGA::GUIEventHandler
{
	virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa) override
	{
		if (ea.getEventType() == ea.KEYDOWN)
		{
			// handle event 
		}
	}
};

....
viewer->addEventHandler(new ColorHandler);




Cheers,
Eran

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=75239#75239