OpenSceneGraph/examples/osgwidgetwindow/osgwidgetwindow.cpp

// -*-c++-*- osgWidget - Code by: Jeremy Moles (cubicool) 2007-2008
// $Id: osgwidgetwindow.cpp 66 2008-07-14 21:54:09Z cubicool $

#include <iostream>
#include <osgDB/ReadFile>
#include <osgGA/StateSetManipulator>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgWidget/WindowManager>
#include <osgWidget/ViewerEventHandlers>
#include <osgWidget/Box>

const unsigned int MASK_2D = 0xF0000000;
const unsigned int MASK_3D = 0x0F000000;

// Here we create (and later demonstrate) the use of a simple function callback.
bool windowClicked(osgWidget::Event& ev) {
	std::cout << "windowClicked: " << ev.getWindow()->getName() << std::endl;

	if(ev.getData()) {
		std::string* s = static_cast<std::string*>(ev.getData());

		std::cout << "This is data attached to the event: " << *s << std::endl;
	}

	return true;
}

bool windowScrolled(osgWidget::Event& ev) {
	osgWidget::warn()
		<< "scrolling up? " << ev.getWindowManager()->isMouseScrollingUp()
		<< std::endl
	;

	return true;
}

// Here we dcreate a new class and show how to use a method callback (which differs from
// a function callback in that we are required to also pass the "this" argument).
struct Object {
	bool windowClicked(osgWidget::Event& ev) {
		std::cout << "Object::windowClicked " << ev.getWindow()->getName() << std::endl;

		return true;
	}
};

int main(int argc, char** argv) {
	osgViewer::Viewer viewer;
	
	// Let's get busy! The WindowManager class is actually an osg::Switch,
	// so you can add it to (ideally) an orthographic camera and have it behave as
	// expected. Note that you create a WindowManager with a NodeMask--it is very important
	// that this be unique for picking to work properly. This also makes it possible to have
	// multiple WindowManagers each operating on their own, unique set of Window objects.
	// The final bool argument is a group of flags that introduce optional functionality
	// for the WindowManager. In our case we include the flags USE_PYTHON and USE_LUA,
	// to demonstrate (and test) their usage. Finally, we pass the temporary WM_NO_BETA_WARN
	// argument, which prevents creating the orange warning window. :) It will be shown
	// in other examples...
	osgWidget::WindowManager* wm = new osgWidget::WindowManager(
		&viewer,
		1280.0f,
		1024.0f,
		MASK_2D,
		osgWidget::WindowManager::WM_USE_LUA |
		osgWidget::WindowManager::WM_USE_PYTHON |
		osgWidget::WindowManager::WM_PICK_DEBUG |
		osgWidget::WindowManager::WM_NO_BETA_WARN
	);

	// An actual osgWidget::Window is pure virtual, so we've got to use the osgWidget::Box
	// implementation for now. At a later time, support for Tables and other kinds of
	// advanced layout Window types will be added.
	osgWidget::Window* box = new osgWidget::Box("box", osgWidget::Box::HORIZONTAL);

	// Now we actually attach our two types of callbacks to the box instance. The first
	// uses the simple function signature, the second uses a bound method, passing "this"
	// as the second argument to the Callback constructor.
	Object obj;

	static std::string data = "lol ur face!";

	box->addCallback(osgWidget::Callback(&windowClicked, osgWidget::EVENT_MOUSE_PUSH, &data));
	box->addCallback(osgWidget::Callback(&windowScrolled, osgWidget::EVENT_MOUSE_SCROLL));
	box->addCallback(osgWidget::Callback(
		&Object::windowClicked,
		&obj,
		osgWidget::EVENT_MOUSE_PUSH
	));

	// Create some of our "testing" Widgets; included are two Widget subclasses I made
	// during testing which I've kept around for testing purposes. You'll notice
	// that you cannot move the box using the NullWidget, and that the NotifyWidget
	// is a bit verbose. :)
	osgWidget::Widget* widget1 = new osgWidget::NotifyWidget("widget1", 300.0f, 100.0f);
	osgWidget::Widget* widget2 = new osgWidget::NullWidget("widget2", 400.0f, 75.0f);
	osgWidget::Widget* widget3 = new osgWidget::Widget("widget3", 100.0f, 100.0f);
	// Set the colors of widget1 and widget3 to green.
	widget1->setColor(0.0f, 1.0f, 0.0f, 1.0f);
	widget1->setCanFill(true);
	widget3->setColor(0.0f, 1.0f, 0.0f, 1.0f);

	widget1->setImage(osgDB::readImageFile("Images/Saturn.TGA"), true);

	// Set the color of widget2, to differentiate it and make it sassy. This is
	// like a poor man's gradient!
	widget2->setColor(0.9f, 0.0f, 0.0f, 0.9f, osgWidget::Widget::LOWER_LEFT);
	widget2->setColor(0.9f, 0.0f, 0.0f, 0.9f, osgWidget::Widget::LOWER_RIGHT);
	widget2->setColor(0.0f, 0.0f, 0.9f, 0.9f, osgWidget::Widget::UPPER_RIGHT);
	widget2->setColor(0.0f, 0.0f, 0.9f, 0.9f, osgWidget::Widget::UPPER_LEFT);

	// Now add our newly created widgets to our box.
	box->addWidget(widget1);
	box->addWidget(widget2);
	box->addWidget(widget3);

	// For maximum efficiency, Windows don't automatically reallocate their geometry
	// and internal positioning every time a widget is added. Thus, we either have to
	// call the WindowManger::resizeAllWindows method or manually call
	// Window::resize when we're ready.
	box->resize();

	// Now, lets clone our existing box and create a new copy of of it, also adding that
	// to the WindowManager. This demonstrates the usages of OSG's ->clone() support,
	// though that is abstracted by our META_UIObject macro.
	osgWidget::Window* boxCopy = box->cloneAs("newBox");

	// Move our copy to make it visible.
	boxCopy->setOrigin(0.0f, 125.0f);

	boxCopy->getByName("widget1")->setColor(0.5f, 0.0f, 1.0f, 1.0f);
	boxCopy->getByName("widget3")->setColor(0.5f, 0.0f, 1.0f, 1.0f);

	// Add the successfully created Box (if we get this far) into the WindowManager, so
	// that they can receive events.
	wm->addChild(box);
	wm->addChild(boxCopy);

	// Now, ask our new box to be 100% the width of the WindowManager.
	boxCopy->resizePercent(100.0f, 0.0f);

	// Here we demonstrate the use of osgWidget/io_utils. This is really only useful for
	// debugging at the moment, but later I'll make it more generic for .osg and .ive
	// creation.
	// std::cout << *box << std::endl << *boxCopy << std::endl;

	// Add our event handler; is this better as a MatrixManipulator? Add a few other
	// helpful ViewerEventHandlers.
	viewer.addEventHandler(new osgWidget::MouseHandler(wm));
	viewer.addEventHandler(new osgWidget::KeyboardHandler(wm));
	viewer.addEventHandler(new osgViewer::StatsHandler());
	viewer.addEventHandler(new osgViewer::WindowSizeHandler());
	viewer.addEventHandler(new osgGA::StateSetManipulator(
		viewer.getCamera()->getOrCreateStateSet()
	));

	// Setup our OSG objects for our scene; note the use of the utility function
	// createOrthoCamera, which is just a helper for setting up a proper viewing area.
	// An alternative (and a MUCH easier alternative at that!) is to
	// simply use the createParentOrthoCamera method of the WindowManager class,
	// which will wrap the calls to createOrthoCamera and addChild for us! Check out
	// some of the other examples to see this in action...
	osg::Group*  group  = new osg::Group();
	osg::Camera* camera = osgWidget::createInvertedYOrthoCamera(1280.0f, 1024.0f);
	osg::Node*   model  = osgDB::readNodeFile("cow.osg");

	// Set our first non-UI node to be something other than the mask we created our
	// WindowManager with to avoid picking.
	// TODO: Do I need to create a mechanism for doing this automatically, or should
	// that be the responsibility of the users of osgWidget?
	model->setNodeMask(MASK_3D);

	// Add the WindowManager instance to the 2D camera. This isn't strictly necessary,
	// and you can get some cool results putting the WindowManager directly into a
	// 3D scene. This is not necessary if you use WindowManager::createParentOrthoCamera.
	camera->addChild(wm);

	// Add our camera and a testing 3D model to the scene.
	group->addChild(camera);
	group->addChild(model);

	// Here we show how to both run simple strings of code AND run entire files. These
	// assume that you're running the osgwidgetwindow example from the build directory,
	// otherwise you'll need to adjust the file path below in the call to runFile().
	wm->getLuaEngine()->eval("window = osgwidget.newWindow()");
	wm->getLuaEngine()->runFile("osgWidget/osgwidgetwindow.lua");

	wm->getPythonEngine()->eval("import osgwidget");
	wm->getPythonEngine()->runFile("osgWidget/osgwidgetwindow.py");

	viewer.setUpViewInWindow(0, 0, 1280, 1024);
	viewer.setSceneData(group);

	/*
	osgViewer::Viewer::Cameras cameras; 
	viewer.getCameras(cameras);
	osg::Camera* c = cameras[0];
	osg::Matrix s = osg::Matrix::scale(1.0f, -1.0f, 1.0f);
	c->setProjectionMatrix(s * c->getProjectionMatrix());
	*/

	return viewer.run();
}