Stop constant input from a held down key?

[Culando]

Asking for help again as I can never seem to find this information on my own no matter how thoroughly I look.

Ok, I have this simple routine to shoot bullets, activated by the 'w' key.

Code: Select all

if ( receiver.Keys[ KEY_KEY_W ] ){
			IAnimatedMesh* mesh = smgr->getMesh("../../media/bullet1.x");
			IAnimatedMeshSceneNode* zap = smgr->addAnimatedMeshSceneNode( mesh );

//set various settings
			
	scene::ISceneNodeAnimator* anim2 = 0;

	// set flight line

	anim2 = smgr->createFlyStraightAnimator(core::vector3df(boxy_x,boxy_y,boxy_z),core::vector3df(-40,boxy_y,boxy_z), 3000,false);
	zap->addAnimator(anim2);	
	anim2->drop();
		}

It works like a charm, but will send out a constant stream of bullets if the 'w' key is held down.

How would I fix this routine so it will only fire once every time the key is pressed down?

I'm almost certain it's an obvious thing, but I can't find it anywhere.

[Phant0m51]

if (receiver.PressedDown == true && receiver.Key[KEY_KEY_W])

The reason your game acts as if the W is being pushed a ton of times is because of how operating systems auto-repeat characters when you hold them down. Using the 'receiver.PressedDown' stops it from repeating.

[vitek]

Phant0m51,

Most likely his Keys array is a bunch of bools indicating the current key state, so he is basically checking PressedDown already.

Culando,

If you only want one bullet per key press, then you need to check for the key to go from a not pressed state to the pressed state. Something like this...

Code: Select all

  bool bKeyWasPressed = false;

  while (device->run())
  {
    if (device->isWindowActive())
    {
      if ( receiver.Keys[KEY_KEY_W] && !bKeyWasPressed)
      {
        // create a bullet
      }

      bKeyWasPressed = receiver.Keys[KEY_KEY_W];

      if (driver->beginScene(...))
      {
        smgr->drawAll();
        driver->endScene();
      }
    }
  }

  device->drop();
  return 0;
}

Travis

[Culando]

Awesome, thanks a lot. I KNEW it'd be something simple. Only a few more things to fix and my bullet code will be finished and I can move on.