Irrlicht Engine

Posted: **Mon Apr 11, 2005 7:20 pm**

I have tried to implement an event reciever in my program, i used a lot of the code form the Mercior Irrlicht/Newton tutorial. But when i click the mouse or hit escape nothing happens, put in breakpoints and execution never reaches callback. Any ideas?

here is the class definition

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class CGame  : public IEventReceiver {

Here is the callback prototype

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// Irrlicht Callbacks
	virtual bool OnEvent(SEvent event);

Here is the callback definition

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bool CGame::OnEvent(SEvent event)
{
     printf("Newt~licht Event Recieved...");
     if (event.EventType == irr::EET_MOUSE_INPUT_EVENT && event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN)
    {
		// make a cube where the camera is and set its velocity to follow the target
		NewtonModel *tmp = MakeModel(cam->getPosition()/*, veloc*/);
		if (!tmp) return false;
		vector3df camvec = (cam->getTarget() - cam->getPosition()).normalize() * 500;
		float newpos[3] = { camvec.X, camvec.Y, camvec.Z };
		NewtonBodySetVelocity(tmp->body1, (float*)newpos);
	}
	else if(event.EventType == EET_GUI_EVENT)
	{
         //here put GUI STUFF     
    }
    else if( event.EventType == EET_KEY_INPUT_EVENT)
    {
        bool key[KEY_KEY_CODES_COUNT];
        key[event.KeyInput.Key] = event.KeyInput.PressedDown;
        if(key[KEY_ESCAPE])
        {
               NewtonReleaseCollision(nWorld, floor->collision); 
               NewtonDestroy(nWorld);  
	           device->drop();
        }
    }

	return false;
    
}

Posted: **Mon Apr 11, 2005 7:49 pm**

return true if you handle the event, return false if you don't.

For example, if you're using an FPS camera, and also trying to get input from other keys. You need to return false from your event receiver's OnEvent function if it gets the KEY_UP, KEY_DOWN, KEY_LEFT, KEY_RIGHT. If you return true, it means you're handling the event and noone else should.

Posted: **Mon Apr 11, 2005 8:33 pm**

ok so it should only return false at end if none of the relevent events happened, right?

So when should i return true?

Like this:

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bool CGame::OnEvent(SEvent event)
{
     
     if (event.EventType == irr::EET_MOUSE_INPUT_EVENT && event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN)
    {
      // make a cube where the camera is and set its velocity to follow the target
      NewtonModel *tmp = MakeModel(cam->getPosition()/*, veloc*/);
      if (!tmp) return false;
      vector3df camvec = (cam->getTarget() - cam->getPosition()).normalize() * 500;
      float newpos[3] = { camvec.X, camvec.Y, camvec.Z };
      NewtonBodySetVelocity(tmp->body1, (float*)newpos);
      
      return true;   ///// IS THIS WHERE IT SOULD GO?

   }

At the end of each reletive section, check with if statement, if valid do lines of code, return true. That how it goes?

Posted: **Mon Apr 11, 2005 10:31 pm**

Did you pass the event receiver to your device?

Posted: **Tue Apr 12, 2005 3:14 pm**

I dont think i did:

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device = createDevice(EDT_OPENGL, core::dimension2d<s32>(640, 480), 16, false,false,false);

After checking the documentation, i think it should be this, no?

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device = createDevice(EDT_OPENGL, core::dimension2d<s32>(640, 480), 16, false,false,false,OnEvent);

Do i put in the name of the event reciever or just specify that there is one and the program will pick up on it??

once again though, can anyone tell me WHERE i return true within my event reciever?

Posted: **Tue Apr 12, 2005 4:42 pm**

You do either:

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EventReceiverClass receiver;
device = createDevice(EDT_OPENGL, core::dimension2d<s32>(640, 480), 16, false,false,false,&receiver);

Or if you call createDevice from within a class that derives from IEventReceiver (e.g. your CGame class):

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device = createDevice(EDT_OPENGL, core::dimension2d<s32>(640, 480), 16, false,false,false,this);

Posted: **Tue Apr 12, 2005 4:57 pm**

Thanks a million jox, you have now achieved guru status in my books. Simple problems are always the hardest to solve without experts around!
Completely forgot the event reciever was even dealt with in createDevice. Threw in a 'this' at the end and everythin was hunky-dorey!!!! I now have poop flying out of my camera!!!!!!

Irrlicht Engine

On Event Callback not calling back!

On Event Callback not calling back!