I am trying to develop a normal walkthrough program in OSG . I am trying use
wasd for movement and mouse for rotation .
W-front A-left D-right S-back .
The wads part is done , but when it comes to mouse movement i am facing a
small problem .
What i am trying to do is , i am calculating the change in x co-ordinate and
y co-ordinate of the mouse while it is moving . And i am rotating according
to value of dx and dy .I was able to do it quite sucessfully .. but then i
faced a problem . The problem as that i couldnt rotate more when the
pointer is at a corner . coz near the corner he cant move further and dx=0
or dy=0 . Thus i wasnt able to move anything :( .
so i thought of restoring the mouse pointer every frame to the center of the
window. For that i used requestWarpPointer() of osgViewer::GraphicsWindow .
But now the program is behaving weirdly ... can u please check it out ..
thanx in advance
----------------------------------------------
Maruti Borker
IIIT Hyderabad
Website:-
http://students.iiit.ac.in/~maruti<http://students.iiit.ac.in/%7Emaruti>
Blog:- http://marutiborker.wordpress.com
#include <osg/PositionAttitudeTransform>
#include <osg/Group>
#include <osg/Node>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osgGA/TrackballManipulator>
// Main Global Variables needed
osgGA::TrackballManipulator *Mn;
osgViewer::GraphicsWindow* gw;
class KeyboardHandler: public osgGA::GUIEventHandler
{
public:
KeyboardHandler() {}
bool handle(const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &)
{
if (ea.getEventType() == osgGA::GUIEventAdapter::KEYDOWN)
{
if (ea.getKey() == 'w') { // To move forward
osg::Matrixd tempMatrix;
tempMatrix.makeTranslate(osg::Vec3f(0.0,0.0,-1.0));
tempMatrix=tempMatrix*Mn->getMatrix();
Mn->setByMatrix(tempMatrix);
return true;
}
if (ea.getKey() == 'a') { //To move left
osg::Matrixd tempMatrix;
tempMatrix.makeTranslate(osg::Vec3f(-1.0,0.0,0.0));
tempMatrix=tempMatrix*Mn->getMatrix();
Mn->setByMatrix(tempMatrix);
return true;
}
if (ea.getKey() == 's') { //To move backward
osg::Matrixd tempMatrix;
tempMatrix.makeTranslate(osg::Vec3f(0.0,0.0,1.0));
tempMatrix=tempMatrix*Mn->getMatrix();
Mn->setByMatrix(tempMatrix);
return true;
}
if (ea.getKey() == 'd') { //To move right
osg::Matrixd tempMatrix;
tempMatrix.makeTranslate(osg::Vec3f(1.0,0.0,0.0));
tempMatrix=tempMatrix*Mn->getMatrix();
Mn->setByMatrix(tempMatrix);
return true;
}
}
if(ea.getEventType() == osgGA::GUIEventAdapter::DRAG || ea.getEventType() == osgGA::GUIEventAdapter::MOVE )
{
static float px = ea.getXnormalized();
static float py = ea.getYnormalized();
/* float dx =ea.getXnormalized();
float dy =ea.getYnormalized();
if(dx==400 && dy==400) return false;
dx-=px;
dx*=-20;
dy-=py;
dy*=20;*/
float dx = -(ea.getXnormalized()-px)*20;
float dy = (ea.getYnormalized()-py)*20;
px = ea.getXnormalized();
py = ea.getYnormalized();
osg::Matrixd tempMatrix;
tempMatrix.makeRotate(
osg::DegreesToRadians(dx), osg::Vec3(0,1,0), // roll
osg::DegreesToRadians(dy), osg::Vec3(1,0,0) , // pitch
osg::DegreesToRadians(0.0), osg::Vec3(0,0,1) );
tempMatrix=tempMatrix*Mn->getMatrix();
Mn->setByMatrix(tempMatrix);
}
return false;
}
};
int main()
{
osg::Node* tankNode = NULL;
osg::Group* root = NULL;
//Start
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->x = 200;
traits->y = 200;
traits->width = 800;
traits->height = 600;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
gw = dynamic_cast<osgViewer::GraphicsWindow*>(gc.get());
gw->useCursor(false);
gw->requestWarpPointer(400,400);
//End
osgViewer::Viewer viewer;
viewer.getCamera()->setGraphicsContext(gc.get());
viewer.getCamera()->setViewport(0,0,800,600);
osg::Vec3 tankPosit;
osg::PositionAttitudeTransform* tankXform;
tankNode = osgDB::readNodeFile("cow.osg");
root = new osg::Group();
tankXform = new osg::PositionAttitudeTransform();
root->addChild(tankXform);
tankXform->addChild(tankNode);
tankPosit.set(5,0,0);
tankXform->setPosition( tankPosit );
Mn= new osgGA::TrackballManipulator();
viewer.setCameraManipulator(Mn);
KeyboardHandler *KH=new KeyboardHandler;
viewer.addEventHandler(KH);
viewer.setSceneData( root );
viewer.realize();
int cnt=0;
while( !viewer.done() )
{
cnt++;
if(cnt==100)
{
gw->requestWarpPointer(400,400);
cnt=0;
}
viewer.frame();
}
}
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