HI Shoham,
I can't really say what might be the cause of the problem, there are
just too many things that could be going on in your app.
General comments on the callback is that rather than use a
NodeCallback try attaching the callback to the Text itself
(Drawable::UpdateCallback).
Also in your code don't use C casts use dynamic_cast<osgText::Text*>()
instead and check the return value to make sure its non null.
Another defensive programming time would be to not do a getDrawable(0)
without first checking that enough drawable exist as there is always a
chance you scene graph isn't set up correctly and as your intend.
The last item to be aware of is management of multiple graphics
contexts, this may or may not have some baring on your app as I know
nothing about your app.
Robert.
On 1/21/07, Shoham Ben-Har <[EMAIL PROTECTED]> wrote:
Hello
I have some problem with osgText::Text.
I tried to do the following:
I create a osg::Group And attach to it a osg::Geode
To the Geode I add a drawable osgText::Text.
later I set Update Callback to the osgText::Text, and in that callback
I change the text via setText.
I have 1 integer and 1 float in the text with I put them in a string
via sprintf.
The problem is that the text disappear after I change some value in
the text (usually when I change the float).
It's not consistent, it's disappear and then show up again after another change.
m_GroupInterceptorData = new osg::Group;
m_GroupInterceptorData->setNodeMask(GODS_VIEW_MASK);
m_TextInterceptorData = new osgText::Text;
osgText::Font *font = osgText::readFontFile("fonts/mriam.ttf");
TextInterceptorData ->setCharacterSize(AIRCRAFT_DATA_TEXT_SIZE);
TextInterceptorData ->setAxisAlignment(osgText::Text::XY_PLANE);
TextInterceptorData ->setLayout(osgText::Text::LEFT_TO_RIGHT);
TextInterceptorData ->setFont(font);
TextInterceptorData ->setFontResolution(AIRCRAFT_DATA_TEXT_SIZE,
AIRCRAFT_DATA_TEXT_SIZE);
TextInterceptorData ->setAlignment(osgText::Text::LEFT_CENTER);
TextInterceptorData
->setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
TextInterceptorData ->setColor(AIRCRAFT_DATA_COLOR);
osg::Geode *geodeInterceptor = new osg::Geode();
geodeInterceptor->addDrawable(m_TextInterceptorData.get());
geodeInterceptor->setUpdateCallback(new
CInterceptorDataUpdateCallback(m_SceneManager));
m_GroupInterceptorData->addChild(geodeInterceptor);
The callback:
char content[128];
sprintf(content,"H: %d Kft\nV: %.1lf
Mach",heightAboveTerrain,velocity);
osgText::Text* text =
(osgText::Text*)(currentGeode->getDrawable(0));
text->setText(content);
text->setPosition(position);
Help please...
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