FGFS-4.1/OpenSceneGraph
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Added text hud instructions.

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This commit is contained in:
Robert Osfield 2003-09-30 15:50:46 +00:00
parent af8b5df0ae
commit 80d1e69e2c
1 changed files with 95 additions and 24 deletions
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119
examples/osgforest/osgforest.cpp
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@ -1,22 +1,27 @@
#include <osg/Geode>
#include <osg/ShapeDrawable>
#include <osg/Material>
#include <osg/Texture2D>
#include <osg/Billboard>
#include <osg/AlphaFunc> #include <osg/AlphaFunc>
#include <osg/Billboard>
#include <osg/BlendFunc> #include <osg/BlendFunc>
#include <osg/StateSet> #include <osg/Depth>
#include <osg/Geode>
#include <osg/Geometry> #include <osg/Geometry>
#include <osg/Material>
#include <osg/Math>
#include <osg/MatrixTransform> #include <osg/MatrixTransform>
#include <osg/PolygonOffset>
#include <osg/Projection>
#include <osg/ShapeDrawable>
#include <osg/StateSet>
#include <osg/Switch> #include <osg/Switch>
#include <osg/Texture2D>
#include <osgProducer/Viewer>
#include <osgDB/ReadFile> #include <osgDB/ReadFile>
#include <osgUtil/IntersectVisitor> #include <osgUtil/IntersectVisitor>
#include <osgUtil/SmoothingVisitor> #include <osgUtil/SmoothingVisitor>
#include <osg/Math> #include <osgText/Text>
#include <osgProducer/Viewer>
// for the grid data.. // for the grid data..
#include "../osghangglide/terrain_coords.h" #include "../osghangglide/terrain_coords.h"
@ -102,14 +107,20 @@ public:
osg::Node* createXGraph(Cell* cell,osg::StateSet* stateset); osg::Node* createXGraph(Cell* cell,osg::StateSet* stateset);
osg::Node* createTransformGraph(Cell* cell,osg::StateSet* stateset); osg::Node* createTransformGraph(Cell* cell,osg::StateSet* stateset);
osg::Node* createHUDWithText(const std::string& text);
osg::Node* createScene(); osg::Node* createScene(unsigned int numTreesToCreates);
void advanceToNextTechnique(int delta=1) void advanceToNextTechnique(int delta=1)
{ {
if (_techniqueSwitch.valid()) if (_techniqueSwitch.valid())
{ {
_currentTechnique = (_currentTechnique + delta)%_techniqueSwitch->getNumChildren(); _currentTechnique += delta;
if (_currentTechnique<0)
_currentTechnique = _techniqueSwitch->getNumChildren()-1;
if (_currentTechnique>=(int)_techniqueSwitch->getNumChildren())
_currentTechnique = 0;
_techniqueSwitch->setSingleChildOn(_currentTechnique); _techniqueSwitch->setSingleChildOn(_currentTechnique);
} }
} }
@ -701,12 +712,53 @@ osg::Node* ForestTechniqueManager::createTransformGraph(Cell* cell,osg::StateSet
else return transform_group; else return transform_group;
} }
osg::Node* ForestTechniqueManager::createHUDWithText(const std::string& str)
{
osg::Geode* geode = new osg::Geode();
std::string timesFont("fonts/arial.ttf");
osg::Node* ForestTechniqueManager::createScene() // turn lighting off for the text and disable depth test to ensure its always ontop.
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
// or disable depth test, and make sure that the hud is drawn after everything
// else so that it always appears ontop.
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
stateset->setRenderBinDetails(11,"RenderBin");
osg::Vec3 position(150.0f,800.0f,0.0f);
osg::Vec3 delta(0.0f,-120.0f,0.0f);
{
osgText::Text* text = new osgText::Text;
geode->addDrawable( text );
text->setFont(timesFont);
text->setPosition(position);
text->setText(str);
position += delta;
}
// create the hud.
osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
modelview_abs->setReferenceFrame(osg::Transform::RELATIVE_TO_ABSOLUTE);
modelview_abs->setMatrix(osg::Matrix::identity());
modelview_abs->addChild(geode);
osg::Projection* projection = new osg::Projection;
projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
projection->addChild(modelview_abs);
return projection;
}
osg::Node* ForestTechniqueManager::createScene(unsigned int numTreesToCreates)
{ {
osg::Vec3 origin(0.0f,0.0f,0.0f); osg::Vec3 origin(0.0f,0.0f,0.0f);
osg::Vec3 size(1000.0f,1000.0f,200.0f); osg::Vec3 size(1000.0f,1000.0f,200.0f);
unsigned int numTreesToCreates = 10000;
std::cout<<"Creating terrain..."; std::cout<<"Creating terrain...";
osg::ref_ptr<osg::Node> terrain = createTerrain(origin,size); osg::ref_ptr<osg::Node> terrain = createTerrain(origin,size);
@ -746,17 +798,32 @@ osg::Node* ForestTechniqueManager::createScene()
_techniqueSwitch = new osg::Switch; _techniqueSwitch = new osg::Switch;
std::cout<<"Creating billboard based forest..."; {
_techniqueSwitch->addChild(createBillboardGraph(cell.get(),dstate)); std::cout<<"Creating billboard based forest...";
std::cout<<"done."<<std::endl; osg::Group* group = new osg::Group;
group->addChild(createBillboardGraph(cell.get(),dstate));
group->addChild(createHUDWithText("Using osg::Billboard's to create a forest\n\nPress left cursor key to select osg::MatrixTransform based forest\nPress right cursor key to select double quad based forest"));
_techniqueSwitch->addChild(group);
std::cout<<"done."<<std::endl;
}
{
std::cout<<"Creating billboard based forest...";
osg::Group* group = new osg::Group;
group->addChild(createXGraph(cell.get(),dstate));
group->addChild(createHUDWithText("Using double quads to create a forest\n\nPress left cursor key to select osg::Billboard based forest\nPress right cursor key to select osg::MatrixTransform based forest\n"));
_techniqueSwitch->addChild(group);
std::cout<<"done."<<std::endl;
}
std::cout<<"Creating double quad based forest..."; {
_techniqueSwitch->addChild(createXGraph(cell.get(),dstate)); std::cout<<"Creating billboard based forest...";
std::cout<<"done."<<std::endl; osg::Group* group = new osg::Group;
group->addChild(createTransformGraph(cell.get(),dstate));
std::cout<<"Creating transform based forest..."; group->addChild(createHUDWithText("Using osg::MatrixTransform's to create a forest\n\nPress left cursor key to select double quad based forest\nPress right cursor key to select osg::Billboard based forest"));
_techniqueSwitch->addChild(createTransformGraph(cell.get(),dstate)); _techniqueSwitch->addChild(group);
std::cout<<"done."<<std::endl; std::cout<<"done."<<std::endl;
}
_currentTechnique = 0; _currentTechnique = 0;
_techniqueSwitch->setSingleChildOn(_currentTechnique); _techniqueSwitch->setSingleChildOn(_currentTechnique);
@ -780,10 +847,14 @@ int main( int argc, char **argv )
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates the osg::Shape classes."); arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates the osg::Shape classes.");
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ..."); arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information"); arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
arguments.getApplicationUsage()->addCommandLineOption("--trees <number>","Set the number of trees to create");
// construct the viewer. // construct the viewer.
osgProducer::Viewer viewer(arguments); osgProducer::Viewer viewer(arguments);
float numTreesToCreates = 10000;
arguments.read("--trees",numTreesToCreates);
// set up the value with sensible default event handlers. // set up the value with sensible default event handlers.
viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS); viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
@ -811,7 +882,7 @@ int main( int argc, char **argv )
return 1; return 1;
} }
osg::Node* node = ttm->createScene(); osg::Node* node = ttm->createScene((unsigned int)numTreesToCreates);
// add model to viewer. // add model to viewer.
viewer.setSceneData( node ); viewer.setSceneData( node );