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Author Topic: No Key Pressed  (Read 6470 times)

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Offline Tgooseman

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No Key Pressed
« on: April 19, 2011, 10:21:09 pm »
What is the syntax for running a loop while no key is being pressed?  What command(s) would be used to basically recognize a key is not being pressed, then run the code? I am making a game similar to helicopter, and it would make it so the helicopter would fall when no key is pressed.  I know it would most likely involve the getKey command, but I can't figure out how to manipulate it. 

P.S this is my first post on Omnimaga :D
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Offline ruler501

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Re: No Key Pressed
« Reply #1 on: April 19, 2011, 10:25:22 pm »
I use to have code to do this on my 84 emulator before I accidently Ram cleared it with an OS update.

It was something like
Code: [Select]
:0->A
:While A = 0
:getKey -> A

I'm assuming your using TI-BASIC on 84/83/82

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« Last Edit: April 19, 2011, 10:29:08 pm by ruler501 »
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Offline Runer112

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Re: No Key Pressed
« Reply #2 on: April 19, 2011, 10:28:10 pm »
Welcome! May I suggest introducing yourself so we can learn a little bit about you and all say hi?

To answer your question, I believe you want the getKey(0) command. Normally, getKey(number) is used to check if a specific key corresponding to that key code is pressed. But if you enter a zero, it will instead check if any key is pressed. To create a loop that repeats as long as no key is pressed, I would suggest the following:

Code: [Select]
While 1             .Endless loop...

EndIf getKey(0)     .Until a key is pressed
« Last Edit: April 19, 2011, 10:32:53 pm by Runer112 »
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Offline Tgooseman

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Re: No Key Pressed
« Reply #3 on: April 19, 2011, 10:28:33 pm »
Oh i mean in AXE, sorry I thought i posted in the AXE part of the forum! By any chance do you know how in AXE?
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Offline ruler501

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Re: No Key Pressed
« Reply #4 on: April 19, 2011, 10:29:43 pm »
oh sorry I just assumed BASIC. I didn't look at where it was...
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Offline Tgooseman

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Re: No Key Pressed
« Reply #5 on: April 19, 2011, 10:31:14 pm »
My fault, should have been more specific.
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Offline ruler501

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Re: No Key Pressed
« Reply #6 on: April 19, 2011, 10:33:45 pm »
You posted in the Axe section you had the right to expect that we'd help you with Axe code
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Offline willrandship

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Re: No Key Pressed
« Reply #7 on: April 19, 2011, 10:48:10 pm »
getkeyr (the same as dispgraphr) does the same without a loop, but it doesn't use 2nd or Alpha the same way, since it's the OS input routine. It also has a different keymap.
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Offline Deep Toaster

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Re: No Key Pressed
« Reply #8 on: April 20, 2011, 06:17:47 pm »
Quote from: willrandship on April 19, 2011, 10:48:10 pm
getkeyr (the same as dispgraphr) does the same without a loop, but it doesn't use 2nd or Alpha the same way, since it's the OS input routine. It also has a different keymap.

Yep, it basically waits for a key combination such as MATH, 2ND+MATH, ALPHA+MATH, etc.
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Offline FloppusMaximus

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Re: No Key Pressed
« Reply #9 on: April 20, 2011, 11:20:36 pm »
Is there an Axe command to halt the CPU?  It's a good idea to do so while you're waiting for user input.
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Offline AngelFish

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Re: No Key Pressed
« Reply #10 on: April 20, 2011, 11:48:20 pm »
As far as I'm aware, the only way to do it is :Asm(76
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Offline calc84maniac

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Re: No Key Pressed
« Reply #11 on: April 20, 2011, 11:50:26 pm »
The Stop command compiles to halt.
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Offline shmibs

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Re: No Key Pressed
« Reply #12 on: April 20, 2011, 11:50:44 pm »
runer's syntax is correct. however, if you're making a helicopter game it would make a bit more sense (and probably make the code more legible later on when you return to it and can't for the life of you figure out what's going on) to leave the code in a helicopter crash or getkey(15) terminated loop with your gravity code executed every cycle and your 'helicopter moves upward' (::)) code in an If getkey(4):execute gravity code:End loop, or alternatively have an infinite loop containing If getkey(4):helicopter goes up code:else:gravity code:End
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Offline Tgooseman

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Re: No Key Pressed
« Reply #13 on: April 22, 2011, 02:13:09 am »
Alright thanks for the suggestions i've got gravity figured out, next up, collision detection. Wish me luck!
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Offline Hayleia

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Re: No Key Pressed
« Reply #14 on: June 08, 2011, 01:52:22 pm »
Then good luck !
Also, "getkey(0)" returns 1 if a key is pressed and returns 0 if no key is pressed (correct me if it is the exact contrary). Maybe it will help. You could use "Repeat getkey(0)" for example. I use it everywhere ;D.
« Last Edit: June 08, 2011, 01:52:38 pm by Hayleia »
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