All. I try to render a hud-text;
I created a hud text in a geode and added it to a slave-camera. It's
good. but when i resize the view and set a new position to the text bases
on the new window rect. The text's position seems based on the old window
rect when when the slave-camera is created.
when created, window rect is (0,0, 100,100) and the text position is :
50,50, it's good;
when resize the window to rect (0,0,200,200) and i try to set the text
position (100,100); I hope the text should be in the center of window, but
it's out of the window range and I can see it in the view.
how can I fix my problem?
Thanks.
xiaodong
the codes is following.
if( _hudCamera.valid() ) _hudCamera.release();
_hudCamera = new osg::Camera;
_hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
osg::ref_ptr<osg::Camera> camera = this->getCamera();
//update the main camera;
osg::ref_ptr<osg::GraphicsContext::Traits> traits;
if( camera.valid() )
{
osg::ref_ptr<osg::GraphicsContext> context =
camera->getGraphicsContext();
if( context.valid() )
{
traits = const_cast<osg::GraphicsContext::Traits*>(
context->getTraits() );
if( traits.valid() )
{
_hudCamera->setGraphicsContext( context.get() );
_hudCamera->setViewport(0,0,traits->width, traits->height );
}
}
}
if( traits.valid() ) {
_hudCamera->setProjectionMatrixAsOrtho2D(0,traits->width,0,traits->height);
_hudCamera->setViewMatrix(osg::Matrix::identity());
_hudCamera->setRenderOrder(osg::Camera::POST_RENDER);
_hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);
std::string timesFont("fonts/times.ttf");
turn lighting off for the text and disable depth test to ensure its
always ontop.
osg::Vec3 position( 10.0f,traits->height/2.0,0.0f);
osg::Geode* geode = new osg::Geode();
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
//--
stateset->setRenderBinDetails(11, "RenderBin");
_hudCamera->addChild( geode );
osgText::Text* text = new osgText::Text;
geode->addDrawable( text );
text->setFont(timesFont);
std::stringstream ss;
ss<<"width:"<<traits->width<<"Height:"<<traits->height<<std::endl;
std::string str;
ss>>str;
std::wstring wstr(str.begin(), str.end());
text->setText( wstr.data() );
text->setPosition(position);
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
--
Xiaodong Wu
吴晓东
"'Xiao' means the time and the view when the sun rises and 'dong' means the
east in Chinese"
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