Hi,
float CenLat = 12.0, CenLon = 77.0;
float MinLat, MaxLat,MinLon,MaxLon;
float Width = 1280, Height = 1024;
float DifLat, DifLon,scale;
float x,y,PrevX,PrevY;
class ModelController : public osgGA::GUIEventHandler
{
public:
ModelController(osg::MatrixTransform* node) : _model(node) {}
virtual bool handle(const osgGA::GUIEventAdapter& ea,
osgGA::GUIActionAdapter& aa);
protected:
osg::ref_ptr<osg::MatrixTransform> _model;
};
bool ModelController::handle( const osgGA::GUIEventAdapter&
ea,osgGA::GUIActionAdapter& aa )
{
if ( !_model ) return false;
float msePreLon = MinLon + ((ea.getX())/scale);
float msePresLt = MinLat + ((ea.getY())/ scale);
if (msePreLon > 180) {
msePreLon = 180;
}
else if (msePreLon < -180) {
msePreLon = -180.0;
}
if (msePresLt > 90) {
msePresLt = 90;
}
else if (msePresLt < -90) {
msePresLt = -90;
}
osg::Matrix matrix = _model->getMatrix();
switch ( ea.getEventType() )
{
case osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON:
{
CenLon = msePreLon;
CenLat = msePresLt ;
if ((CenLon - (DifLon / 2.0)) < -180) { CenLon = -180 +
(DifLon / 2.0); }
else if ((CenLon + (DifLon / 2.0)) > 180) { CenLon = 180 -
(DifLon / 2.0); }
if ((CenLat - (DifLat / 2.0)) < -90) { CenLat = -90 +
(DifLat / 2.0); }
else if ((CenLat + (DifLat / 2.0)) > 90) { CenLat = 90 -
(DifLat / 2.0); }
MinLon = CenLon - (DifLon / 2.0);
MinLat = CenLat - (DifLat / 2.0);
MaxLon = CenLon + (DifLon / 2.0);
MaxLat = CenLat + (DifLat / 2.0);
//matrix *= osg::Matrix::scale(scale,scale,0.0);
matrix *= osg::Matrix::translate(CenLon, 0.0, CenLat);
}
_model->setMatrix( matrix );
}
return false;
}
int main(int argc, char **argv)
{
osg::DisplaySettings::instance()->setNumMultiSamples(4);
scale = Width;
osg::ref_ptr<osg::Node> model =
osgDB::readNodeFile("D:/RamFolder/OSG/OSG_Binary/OpenSceneGraph-3.0.1-VS9.0.30729-x86-debug-12741/data/cessna.osg");
osg::ref_ptr<osg::MatrixTransform > mt = new osg::MatrixTransform;
mt->addChild(model.get());
osg::ref_ptr<osg::Projection> projection = new osg::Projection;
projection->setMatrix(osg::Matrix::ortho2D(-Width/2, Width / 2,
-Height/2, Height / 2));
projection->addChild(mt.get());
if (scale < Width / 2) {
scale = Width / 2;
}
if (scale > Width * 100) {
scale = Width * 100;
}
DifLat = Width / scale;
DifLon = Height / scale;
if ((CenLon - (DifLon / 2.0)) < -180) { CenLon = -180 + (DifLon /
2.0); }
else if ((CenLon + (DifLon / 2.0)) > 180) { CenLon = 180 - (DifLon /
2.0); }
if ((CenLat - (DifLat / 2.0)) < -90) { CenLat = -90 + (DifLat /
2.0); }
else if ((CenLat + (DifLat / 2.0)) > 90) { CenLat = 90 - (DifLat /
2.0); }
MinLon = CenLon - (DifLon / 2.0);
MinLat = CenLat - (DifLat / 2.0);
MaxLon = CenLon + (DifLon / 2.0);
MaxLat = CenLat + (DifLat / 2.0);
osg::ref_ptr<ModelController> ctrler = new ModelController(mt.get());
osgViewer::Viewer viewer;
viewer.setSceneData(projection.get());
viewer.addEventHandler(ctrler.get());
viewer.setUpViewInWindow(500, 500, 500, 500);
return viewer.run();
}
Upon clicking the mouse left button the model should appear there.But it is not
happening.can anyone help me in finding the solution?
...
Thank you!
Cheers,
Rambabu
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=69593#69593
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