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simple c++ bool question

General and Gameplay Programming Programming

Started by Adam West June 07, 2012 09:21 AM

15 comments, last by BeerNutts 11 years, 10 months ago

Adam West

219

Author

June 07, 2012 09:21 AM

Hey there.

this is a snippet from my game engine which handles the key being pressed down.



void redNovember::inputHandle()

{

if(receiver.IsKeyDown(irr::KEY_ESCAPE))

  showGameMenu = true;

else

  showGameMenu = false;





//menu shit

  if (showGameMenu == true)

  {

   SYS->showInGameMenu();

  }

  else



   SYS->hideInGameMenu();



};

the problem is i want to keep showInGame running until the escape key is pressed again, how would i go about doing this?

Robbie Woods

137

June 07, 2012 09:39 AM

while(showGameMenu)
{
// stuff
}

szecs

2,990

June 07, 2012 09:42 AM

you need to "toggle" ShowGameMenu if I understand your intentions.
This means whenever the appropriate key is pressed, change its state from true to false or vice-versa (if the input is event based). If you poll the input state, then the problem becomes a bit more complex, since you have to store the state of the key separately.

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Adam West

219

Author

June 07, 2012 10:16 AM

just tried this so now it stays down, i thought this might work with releasing it again but no dice.



void redNovember::inputHandle()

{

if(receiver.IsKeyDown(irr::KEY_ESCAPE))

  showGameMenu = true;

while(showGameMenu == true)

{

  SYS->showInGameMenu();

  if(receiver.IsKeyDown(irr::KEY_ESCAPE))

   showGameMenu = false;

}



};

thePyro_13

688

June 07, 2012 11:07 AM



void redNovember::inputHandle()

{

if(receiver.IsKeyDown(irr::KEY_ESCAPE))

  showGameMenu = !showGameMenu; //invert current value, this should let you toggle between true and false by pressing esc.



//menu shit

  if (showGameMenu == true)

  {

   SYS->showInGameMenu();

  }

  else

   SYS->hideInGameMenu();



};

This should do it.

But I don't know how the rest of your app works.

rip-off

11,000

June 07, 2012 11:35 AM

szecs hit the nail on the head. If you are actively polling, you'll need to store state between calls - unless the library you are using (Irrlicht?) provides such functionality. Some light Googling suggests that implementing the IEventReceiver interface might support this use.

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Robbie Woods

137

June 07, 2012 03:45 PM

By the way op, rather than writing:

if (someBool == true) or if (someBool == false), you can do:

if (someBool) or if (!someBool)

alvaro

21,604

June 07, 2012 04:37 PM

In the same line as what Shenaynay just posted, instead of writing

if(receiver.IsKeyDown(irr::KEY_ESCAPE))

  showGameMenu = true;

else

  showGameMenu = false;

you can do

showGameMenu = receiver.IsKeyDown(irr::KEY_ESCAPE);

BeerNutts

4,410

June 07, 2012 06:04 PM

Mis-read.

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Adam West

219

Author

June 07, 2012 09:48 PM

i don't really understand the IEventReciever stuff. but all i want to do is that when escape is pressed it will open the gui and it wont close it until escape is pressed again.

simple c++ bool question

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