FGFS-4.1/OpenSceneGraph
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Added keystone grid to aid editing

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This commit is contained in:
Robert Osfield 2013-03-21 11:35:21 +00:00
parent bc3cff2406
commit 6c723df2d6
1 changed files with 93 additions and 1 deletions
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94
examples/osgkeystone/osgkeystone.cpp
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@ -381,6 +381,78 @@ bool KeystoneHandler::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionA
}
}
osg::Node* createGrid(const osg::Vec3& origin, const osg::Vec3& widthVector, const osg::Vec3& heightVector, const osg::Vec4& colour)
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;
geode->addDrawable(geometry.get());
osg::ref_ptr<osg::Vec4Array> colours = new osg::Vec4Array;
colours->push_back(colour);
geometry->setColorArray(colours.get());
geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
geometry->setVertexArray(vertices.get());
// border line
{
unsigned int vi = vertices->size();
vertices->push_back(origin);
vertices->push_back(origin+widthVector);
vertices->push_back(origin+widthVector+heightVector);
vertices->push_back(origin+heightVector);
geometry->addPrimitiveSet(new osg::DrawArrays(GL_LINE_LOOP, vi, 4));
}
// cross lines
{
unsigned int vi = vertices->size();
vertices->push_back(origin);
vertices->push_back(origin+widthVector+heightVector);
vertices->push_back(origin+heightVector);
vertices->push_back(origin+widthVector);
geometry->addPrimitiveSet(new osg::DrawArrays(GL_LINES, vi, 4));
}
// vertices lines
{
unsigned int vi = vertices->size();
osg::Vec3 dv = widthVector/6.0;
osg::Vec3 bv = origin+dv;
osg::Vec3 tv = bv+heightVector;
for(unsigned int i=0; i<5; ++i)
{
vertices->push_back(bv);
vertices->push_back(tv);
bv += dv;
tv += dv;
}
geometry->addPrimitiveSet(new osg::DrawArrays(GL_LINES, vi, 10));
}
// horizontal lines
{
unsigned int vi = vertices->size();
osg::Vec3 dv = heightVector/6.0;
osg::Vec3 bv = origin+dv;
osg::Vec3 tv = bv+widthVector;
for(unsigned int i=0; i<5; ++i)
{
vertices->push_back(bv);
vertices->push_back(tv);
bv += dv;
tv += dv;
}
geometry->addPrimitiveSet(new osg::DrawArrays(GL_LINES, vi, 10));
}
geometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
return geode.release();
}
int main( int argc, char **argv )
{
@ -414,7 +486,22 @@ int main( int argc, char **argv )
return 1;
}
viewer.setSceneData(model.get());
osg::ref_ptr<osg::Group> group = new osg::Group;
group->addChild(model.get());
double screenWidth = osg::DisplaySettings::instance()->getScreenWidth();
double screenHeight = osg::DisplaySettings::instance()->getScreenHeight();
double screenDistance = osg::DisplaySettings::instance()->getScreenDistance();
double fovy = osg::RadiansToDegrees(2.0*atan2(screenHeight/2.0,screenDistance));
double aspectRatio = screenWidth/screenHeight;
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
camera->setClearMask(0x0);
camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
camera->setProjectionMatrixAsPerspective(fovy, aspectRatio, 0.1, 1000.0);
camera->addChild(createGrid(osg::Vec3(-screenWidth*0.5, -screenHeight*0.5, -screenDistance), osg::Vec3(screenWidth, 0.0, 0.0), osg::Vec3(0.0, screenHeight, 0.0), osg::Vec4(1.0,0.0,0.0,1.0)));
viewer.setSceneData(group.get());
// add the state manipulator
viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
@ -430,6 +517,10 @@ int main( int argc, char **argv )
viewer.getCamera()->setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
osg::Matrixd original_pm = viewer.getCamera()->getProjectionMatrix();
osg::Matrixd original_grid_pm = camera->getProjectionMatrix();
group->addChild(camera.get());
// Add keystone handler
viewer.addEventHandler(new KeystoneHandler(keystone));
@ -443,6 +534,7 @@ int main( int argc, char **argv )
if (keystone.valid())
{
viewer.getCamera()->setProjectionMatrix(original_pm * keystone->computeKeystoneMatrix());
camera->setProjectionMatrix(original_grid_pm * keystone->computeKeystoneMatrix());
}
viewer.renderingTraversals();
}