root/OpenSceneGraph/trunk/examples/osgpick/osgpick.cpp @ 8551

Revision 8551, 11.0 kB (checked in by robert, 6 years ago)

Added range of camera manipulators and a center of screen test intersection that
is insticated by pressing 'c' key

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
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1/* OpenSceneGraph example, osgpick.
2*
3*  Permission is hereby granted, free of charge, to any person obtaining a copy
4*  of this software and associated documentation files (the "Software"), to deal
5*  in the Software without restriction, including without limitation the rights
6*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7*  copies of the Software, and to permit persons to whom the Software is
8*  furnished to do so, subject to the following conditions:
9*
10*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
11*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
13*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
14*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
15*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
16*  THE SOFTWARE.
17*/
18
19/* osgpick sample
20* demonstrate use of osgUtil/PickVisitor for picking in a HUD or
21* in a 3d scene,
22*/
23
24#include <osgUtil/Optimizer>
25#include <osgDB/ReadFile>
26#include <osgViewer/Viewer>
27#include <osgViewer/CompositeViewer>
28
29#include <osgGA/TerrainManipulator>
30#include <osgGA/StateSetManipulator>
31#include <osgGA/AnimationPathManipulator>
32#include <osgGA/TrackballManipulator>
33#include <osgGA/FlightManipulator>
34#include <osgGA/DriveManipulator>
35#include <osgGA/KeySwitchMatrixManipulator>
36#include <osgGA/StateSetManipulator>
37#include <osgGA/AnimationPathManipulator>
38#include <osgGA/TerrainManipulator>
39
40#include <osg/Material>
41#include <osg/Geode>
42#include <osg/BlendFunc>
43#include <osg/Depth>
44#include <osg/Projection>
45#include <osg/MatrixTransform>
46#include <osg/Camera>
47#include <osg/io_utils>
48
49#include <osgText/Text>
50
51#include <sstream>
52
53// class to handle events with a pick
54class PickHandler : public osgGA::GUIEventHandler {
55public:
56
57    PickHandler(osgText::Text* updateText):
58        _updateText(updateText) {}
59       
60    ~PickHandler() {}
61   
62    bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa);
63
64    virtual void pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea);
65
66    void setLabel(const std::string& name)
67    {
68        if (_updateText.get()) _updateText->setText(name);
69    }
70   
71protected:
72
73    osg::ref_ptr<osgText::Text>  _updateText;
74};
75
76bool PickHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
77{
78    switch(ea.getEventType())
79    {
80        case(osgGA::GUIEventAdapter::PUSH):
81        {
82            osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
83            if (view) pick(view,ea);
84            return false;
85        }   
86        case(osgGA::GUIEventAdapter::KEYDOWN):
87        {
88            if (ea.getKey()=='c')
89            {       
90                osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
91                osg::ref_ptr<osgGA::GUIEventAdapter> event = new osgGA::GUIEventAdapter(ea);
92                event->setX((ea.getXmin()+ea.getXmax())*0.5);
93                event->setY((ea.getYmin()+ea.getYmax())*0.5);
94                if (view) pick(view,*event);
95            }
96            return false;
97        }   
98        default:
99            return false;
100    }
101}
102
103void PickHandler::pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea)
104{
105    osgUtil::LineSegmentIntersector::Intersections intersections;
106
107    std::string gdlist="";
108    float x = ea.getX();
109    float y = ea.getY();
110    if (view->computeIntersections(x,y,intersections))
111    {
112        for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = intersections.begin();
113            hitr != intersections.end();
114            ++hitr)
115        {
116            std::ostringstream os;
117            if (!hitr->nodePath.empty() && !(hitr->nodePath.back()->getName().empty()))
118            {
119                // the geodes are identified by name.
120                os<<"Object \""<<hitr->nodePath.back()->getName()<<"\""<<std::endl;
121            }
122            else if (hitr->drawable.valid())
123            {
124                os<<"Object \""<<hitr->drawable->className()<<"\""<<std::endl;
125            }
126
127            os<<"        local coords vertex("<< hitr->getLocalIntersectPoint()<<")"<<"  normal("<<hitr->getLocalIntersectNormal()<<")"<<std::endl;
128            os<<"        world coords vertex("<< hitr->getWorldIntersectPoint()<<")"<<"  normal("<<hitr->getWorldIntersectNormal()<<")"<<std::endl;
129            const osgUtil::LineSegmentIntersector::Intersection::IndexList& vil = hitr->indexList;
130            for(unsigned int i=0;i<vil.size();++i)
131            {
132                os<<"        vertex indices ["<<i<<"] = "<<vil[i]<<std::endl;
133            }
134           
135            gdlist += os.str();
136        }
137    }
138    setLabel(gdlist);
139}
140
141osg::Node* createHUD(osgText::Text* updateText)
142{
143
144    // create the hud. derived from osgHud.cpp
145    // adds a set of quads, each in a separate Geode - which can be picked individually
146    // eg to be used as a menuing/help system!
147    // Can pick texts too!
148
149    osg::Camera* hudCamera = new osg::Camera;
150    hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
151    hudCamera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);
152    hudCamera->setViewMatrix(osg::Matrix::identity());
153    hudCamera->setRenderOrder(osg::Camera::POST_RENDER);
154    hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);
155   
156    std::string timesFont("fonts/times.ttf");
157   
158    // turn lighting off for the text and disable depth test to ensure its always ontop.
159    osg::Vec3 position(150.0f,800.0f,0.0f);
160    osg::Vec3 delta(0.0f,-60.0f,0.0f);
161   
162    {
163        osg::Geode* geode = new osg::Geode();
164        osg::StateSet* stateset = geode->getOrCreateStateSet();
165        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
166        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
167        geode->setName("simple");
168        hudCamera->addChild(geode);
169       
170        osgText::Text* text = new  osgText::Text;
171        geode->addDrawable( text );
172       
173        text->setFont(timesFont);
174        text->setText("Picking in Head Up Displays is simple!");
175        text->setPosition(position);
176       
177        position += delta;
178    }   
179   
180   
181    for (int i=0; i<5; i++) {
182        osg::Vec3 dy(0.0f,-30.0f,0.0f);
183        osg::Vec3 dx(120.0f,0.0f,0.0f);
184        osg::Geode* geode = new osg::Geode();
185        osg::StateSet* stateset = geode->getOrCreateStateSet();
186        const char *opts[]={"One", "Two", "Three", "January", "Feb", "2003"};
187        osg::Geometry *quad=new osg::Geometry;
188        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
189        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
190        std::string name="subOption";
191        name += " ";
192        name += std::string(opts[i]);
193        geode->setName(name);
194        osg::Vec3Array* vertices = new osg::Vec3Array(4); // 1 quad
195        osg::Vec4Array* colors = new osg::Vec4Array;
196        colors = new osg::Vec4Array;
197        colors->push_back(osg::Vec4(0.8-0.1*i,0.1*i,0.2*i, 1.0));
198        quad->setColorArray(colors);
199        quad->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE);
200        (*vertices)[0]=position;
201        (*vertices)[1]=position+dx;
202        (*vertices)[2]=position+dx+dy;
203        (*vertices)[3]=position+dy;
204        quad->setVertexArray(vertices);
205        quad->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
206        geode->addDrawable(quad);
207        hudCamera->addChild(geode);
208       
209        position += delta;
210    }   
211   
212   
213   
214    { // this displays what has been selected
215        osg::Geode* geode = new osg::Geode();
216        osg::StateSet* stateset = geode->getOrCreateStateSet();
217        stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
218        stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
219        geode->setName("The text label");
220        geode->addDrawable( updateText );
221        hudCamera->addChild(geode);
222       
223        updateText->setCharacterSize(20.0f);
224        updateText->setFont(timesFont);
225        updateText->setColor(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
226        updateText->setText("");
227        updateText->setPosition(position);
228        updateText->setDataVariance(osg::Object::DYNAMIC);
229       
230        position += delta;
231    }   
232   
233    return hudCamera;
234
235}
236
237int main( int argc, char **argv )
238{
239    // use an ArgumentParser object to manage the program arguments.
240    osg::ArgumentParser arguments(&argc,argv);
241
242    // read the scene from the list of file specified commandline args.
243    osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
244     
245    // if not loaded assume no arguments passed in, try use default mode instead.
246    if (!scene) scene = osgDB::readNodeFile("fountain.osg");
247
248    osg::ref_ptr<osg::Group> group = dynamic_cast<osg::Group*>(scene.get());
249    if (!group)
250    {
251        group = new osg::Group;
252        group->addChild(scene.get());
253    }
254
255    osg::ref_ptr<osgText::Text> updateText = new osgText::Text;
256
257    // add the HUD subgraph.   
258    group->addChild(createHUD(updateText.get()));
259
260    if (arguments.read("--CompositeViewer"))
261    {
262        osg::ref_ptr<osgViewer::View> view = new osgViewer::View;
263        // add the handler for doing the picking
264        view->addEventHandler(new PickHandler(updateText.get()));
265
266        // set the scene to render
267        view->setSceneData(group.get());
268
269        view->setUpViewAcrossAllScreens();
270
271        osgViewer::CompositeViewer viewer;
272        viewer.addView(view.get());
273
274        return viewer.run();
275
276    }
277    else
278    {
279        osgViewer::Viewer viewer;
280
281
282        // add all the camera manipulators
283        {
284            osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
285
286            keyswitchManipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );
287            keyswitchManipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
288            keyswitchManipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );
289
290            unsigned int num = keyswitchManipulator->getNumMatrixManipulators();
291            keyswitchManipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );
292
293            std::string pathfile;
294            char keyForAnimationPath = '5';
295            while (arguments.read("-p",pathfile))
296            {
297                osgGA::AnimationPathManipulator* apm = new osgGA::AnimationPathManipulator(pathfile);
298                if (apm || !apm->valid())
299                {
300                    num = keyswitchManipulator->getNumMatrixManipulators();
301                    keyswitchManipulator->addMatrixManipulator( keyForAnimationPath, "Path", apm );
302                    ++keyForAnimationPath;
303                }
304            }
305
306            keyswitchManipulator->selectMatrixManipulator(num);
307
308            viewer.setCameraManipulator( keyswitchManipulator.get() );
309        }
310
311        // add the handler for doing the picking
312        viewer.addEventHandler(new PickHandler(updateText.get()));
313
314        // set the scene to render
315        viewer.setSceneData(group.get());
316
317        return viewer.run();
318    }
319
320}
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