[osg-users] Question about osgManipulator::GridConstraint

Matthias Asselborn matthias.asselborn at gmx.de
Tue Nov 24 04:29:41 PST 2009


Thank you very much Robert for this reply!

here is the whole code
ive modified the method addDraggerToScene


Code:

/* OpenSceneGraph example, osgmanipulator.
*
*  Permission is hereby granted, free of charge, to any person obtaining a copy
*  of this software and associated documentation files (the "Software"), to deal
*  in the Software without restriction, including without limitation the rights
*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
*  copies of the Software, and to permit persons to whom the Software is
*  furnished to do so, subject to the following conditions:
*
*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
*  THE SOFTWARE.
*/

#include <osgDB/ReadFile>
#include <osgUtil/Optimizer>
#include <osgViewer/Viewer>
#include <osg/CoordinateSystemNode>
#include <osgText/Text>

#include <osgManipulator/TabBoxDragger>
#include <osgManipulator/TabBoxTrackballDragger>
#include <osgManipulator/TabPlaneDragger>
#include <osgManipulator/TabPlaneTrackballDragger>
#include <osgManipulator/TrackballDragger>
#include <osgManipulator/Translate1DDragger>
#include <osgManipulator/Translate2DDragger>
#include <osgManipulator/TranslateAxisDragger>

#include <osg/ShapeDrawable>
#include <osg/MatrixTransform>
#include <osg/Geometry>
#include <osg/Material>

#include <iostream>

osgManipulator::Dragger* createDragger(const std::string& name)
{
	osgManipulator::Dragger* dragger = 0;
	if ("TabPlaneDragger" == name)
	{
		osgManipulator::TabPlaneDragger* d = new osgManipulator::TabPlaneDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}
	else if ("TabPlaneTrackballDragger" == name)
	{
		osgManipulator::TabPlaneTrackballDragger* d = new osgManipulator::TabPlaneTrackballDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}
	else if ("TabBoxTrackballDragger" == name)
	{
		osgManipulator::TabBoxTrackballDragger* d = new osgManipulator::TabBoxTrackballDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}
	else if ("TrackballDragger" == name)
	{
		osgManipulator::TrackballDragger* d = new osgManipulator::TrackballDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}
	else if ("Translate1DDragger" == name)
	{
		osgManipulator::Translate1DDragger* d = new osgManipulator::Translate1DDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}
	else if ("Translate2DDragger" == name)
	{
		osgManipulator::Translate2DDragger* d = new osgManipulator::Translate2DDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}
	else if ("TranslateAxisDragger" == name)
	{
		osgManipulator::TranslateAxisDragger* d = new osgManipulator::TranslateAxisDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}
	else
	{
		osgManipulator::TabBoxDragger* d = new osgManipulator::TabBoxDragger();
		d->setupDefaultGeometry();
		dragger = d;
	}



	return dragger;
}


osg::Node* addDraggerToScene(osg::Node* scene, const std::string& name)
{
	scene->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);

	osg::MatrixTransform* selection = new osg::MatrixTransform;
	selection->addChild(scene);

	osgManipulator::Dragger* dragger = createDragger(name);


	osg::Group* root = new osg::Group;
	root->addChild(dragger);
	root->addChild(selection);

	float scale = scene->getBound().radius() * 1.6;
	dragger->setMatrix(osg::Matrix::scale(scale, scale, scale) *
		osg::Matrix::translate(scene->getBound().center()));

	osgManipulator::GridConstraint *con = new osgManipulator::GridConstraint( *selection , osg::Vec3(0,0,0), osg::Vec3(30,30,30 ) ) ; 
	osg::ref_ptr<osgManipulator::TabBoxDragger> m_pManipulator = new osgManipulator::TabBoxDragger; 
	m_pManipulator->addConstraint( con); 

	dragger->addConstraint(con);
	dragger->addTransformUpdating(selection);

	// we want the dragger to handle it's own events automatically
	dragger->setHandleEvents(true);

	// if we don't set an activation key or mod mask then any mouse click on
	// the dragger will activate it, however if do define either of ActivationModKeyMask or
	// and ActivationKeyEvent then you'll have to press either than mod key or the specified key to
	// be able to activate the dragger when you mouse click on it.  Please note the follow allows
	// activation if either the ctrl key or the 'a' key is pressed and held down.
	dragger->setActivationModKeyMask(osgGA::GUIEventAdapter::MODKEY_CTRL);
	dragger->setActivationKeyEvent('a');

	return root;
}

osg::Node* createDemoScene() {

	osg::Group* root = new osg::Group;

	osg::ref_ptr<osg::Geode> geode_1 = new osg::Geode;
	osg::ref_ptr<osg::MatrixTransform> transform_1 = new osg::MatrixTransform;

	osg::ref_ptr<osg::Geode> geode_2 = new osg::Geode;
	osg::ref_ptr<osg::MatrixTransform> transform_2 = new osg::MatrixTransform;

	osg::ref_ptr<osg::Geode> geode_3 = new osg::Geode;
	osg::ref_ptr<osg::MatrixTransform> transform_3 = new osg::MatrixTransform;

	osg::ref_ptr<osg::Geode> geode_4 = new osg::Geode;
	osg::ref_ptr<osg::MatrixTransform> transform_4 = new osg::MatrixTransform;

	osg::ref_ptr<osg::Geode> geode_5 = new osg::Geode;
	osg::ref_ptr<osg::MatrixTransform> transform_5 = new osg::MatrixTransform;

	osg::ref_ptr<osg::Geode> geode_6 = new osg::Geode;
	osg::ref_ptr<osg::MatrixTransform> transform_6 = new osg::MatrixTransform;

	osg::ref_ptr<osg::Geode> geode_7 = new osg::Geode;
	osg::ref_ptr<osg::MatrixTransform> transform_7 = new osg::MatrixTransform;





	const float radius = 0.8f;
	const float height = 1.0f;
	osg::ref_ptr<osg::TessellationHints> hints = new osg::TessellationHints;
	hints->setDetailRatio(2.0f);
	osg::ref_ptr<osg::ShapeDrawable> shape;

	shape = new osg::ShapeDrawable(new osg::Box(osg::Vec3(0.0f, 0.0f, -2.0f), 10, 10.0f, 0.1f), hints.get());
	shape->setColor(osg::Vec4(0.5f, 0.5f, 0.7f, 1.0f));
	geode_1->addDrawable(shape.get());

	shape = new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(0.0f, 0.0f, 0.0f), radius * 2,radius), hints.get());
	shape->setColor(osg::Vec4(0.8f, 0.8f, 0.8f, 1.0f));
	geode_2->addDrawable(shape.get());

	shape = new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(-3.0f, 0.0f, 0.0f), radius,radius), hints.get());
	shape->setColor(osg::Vec4(0.6f, 0.8f, 0.8f, 1.0f));
	geode_3->addDrawable(shape.get());

	shape = new osg::ShapeDrawable(new osg::Cone(osg::Vec3(3.0f, 0.0f, 0.0f), 2 * radius,radius), hints.get());
	shape->setColor(osg::Vec4(0.4f, 0.9f, 0.3f, 1.0f));
	geode_4->addDrawable(shape.get());

	shape = new osg::ShapeDrawable(new osg::Cone(osg::Vec3(0.0f, -3.0f, 0.0f), radius, height), hints.get());
	shape->setColor(osg::Vec4(0.2f, 0.5f, 0.7f, 1.0f));
	geode_5->addDrawable(shape.get());

	shape = new osg::ShapeDrawable(new osg::Cylinder(osg::Vec3(0.0f, 3.0f, 0.0f), radius, height), hints.get());
	shape->setColor(osg::Vec4(1.0f, 0.3f, 0.3f, 1.0f));
	geode_6->addDrawable(shape.get());

	shape = new osg::ShapeDrawable(new osg::Cone(osg::Vec3(0.0f, 0.0f, 3.0f), 2.0f, 2.0f), hints.get());
	shape->setColor(osg::Vec4(0.8f, 0.8f, 0.4f, 1.0f));
	geode_7->addDrawable(shape.get());






	// material
	osg::ref_ptr<osg::Material> matirial = new osg::Material;
	matirial->setColorMode(osg::Material::DIFFUSE);
	matirial->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 0, 0, 1));
	matirial->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(1, 1, 1, 1));
	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"));

	root->addChild(transform_1.get());
	root->addChild(transform_2.get());
	root->addChild(transform_3.get());
	root->addChild(transform_4.get());
	root->addChild(transform_5.get());
	root->addChild(transform_6.get());
	root->addChild(transform_7.get());



	return root;
}
// 
int main( int argc, char **argv )
{

	// use an ArgumentParser object to manage the program arguments.
	osg::ArgumentParser arguments(&argc,argv);

	// set up the usage document, in case we need to print out how to use this program.
	arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
	arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
	arguments.getApplicationUsage()->addCommandLineOption("--image <filename>","Load an image and render it on a quad");
	arguments.getApplicationUsage()->addCommandLineOption("--dem <filename>","Load an image/DEM and render it on a HeightField");
	arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line parameters");
	arguments.getApplicationUsage()->addCommandLineOption("--help-env","Display environmental variables available");
	arguments.getApplicationUsage()->addCommandLineOption("--help-keys","Display keyboard & mouse bindings available");
	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]");


	// construct the viewer.
	osgViewer::Viewer viewer;

	// get details on keyboard and mouse bindings used by the viewer.
	viewer.getUsage(*arguments.getApplicationUsage());

	// if user request help write it out to cout.
	bool helpAll = arguments.read("--help-all");
	unsigned int helpType = ((helpAll || arguments.read("-h") || arguments.read("--help"))? osg::ApplicationUsage::COMMAND_LINE_OPTION : 0 ) |
		((helpAll ||  arguments.read("--help-env"))? osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE : 0 ) |
		((helpAll ||  arguments.read("--help-keys"))? osg::ApplicationUsage::KEYBOARD_MOUSE_BINDING : 0 );
	if (helpType)
	{
		arguments.getApplicationUsage()->write(std::cout, helpType);
		return 1;
	}

	// report any errors if they have occurred when parsing the program arguments.
	if (arguments.errors())
	{
		arguments.writeErrorMessages(std::cout);
		return 1;
	}

	std::string dragger_name = "TabBoxDragger";
	arguments.read("--dragger", dragger_name);

	osg::Timer_t start_tick = osg::Timer::instance()->tick();

	// read the scene from the list of file specified command line args.
	osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);

	// if no model has been successfully loaded report failure.
	bool tragger2Scene(true);
	if (!loadedModel) 
	{
		//std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
		//return 1;
		loadedModel = createDemoScene();
		tragger2Scene=false;
	}

	// any option left unread are converted into errors to write out later.
	arguments.reportRemainingOptionsAsUnrecognized();

	// report any errors if they have occurred when parsing the program arguments.
	if (arguments.errors())
	{
		arguments.writeErrorMessages(std::cout);
	}

	osg::Timer_t end_tick = osg::Timer::instance()->tick();

	std::cout << "Time to load = "<<osg::Timer::instance()->delta_s(start_tick,end_tick)<<std::endl;


	// optimize the scene graph, remove redundant nodes and state etc.
	osgUtil::Optimizer optimizer;
	optimizer.optimize(loadedModel.get());


	// pass the loaded scene graph to the viewer.
	if ( tragger2Scene ) {
		viewer.setSceneData(addDraggerToScene(loadedModel.get(), dragger_name));
	} else { 
		viewer.setSceneData(loadedModel.get());
	}


	return viewer.run();
}





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