variable toggle - GameCreators Forum

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fllwthewolves

13

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Joined: 4th Sep 2011

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Posted: 5th Mar 2012 23:12

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how can i make it to where a variable will toggle between 1 and 0 everytime a button is pressed i tried this:

+ Code Snippet

if upkey() = 1 and sirens = 0 then sirens = 1
if upkey() = 1 and sirens = 1 then sirens = 1

and it goes through the code too fast to use.

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Brendy boy

19

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Joined: 17th Jul 2005

Location: Croatia

Posted: 6th Mar 2012 00:31

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here:

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if upkey()=0 then upkey_pressed=0
if upkey()=1 and upkey_pressed=0
   upkey_pressed=1
   sirens=1-sirens
endif

BBB GUI Plugin
Landscape & Map Creator

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Ramon156

13

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Joined: 13th Jul 2011

Location: Netherlands

Posted: 6th Mar 2012 09:17 Edited at: 6th Mar 2012 09:18

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Would the above example from Brendy Boy also be a sollution for a weapon firing system?
I made a weapon fire system with a timer so it doesn't shoot each frame. I'm pretty new at DBPro but here's what I made in my code.

+ Code Snippet

`Screen setup
Sync on : Sync rate 100 

`Load level (etc.)

`Variables
Weapontimer = 0

`Main loop
Do 

`Firing button
if spacebar() = 1 and Weapontimer = 0
gosub weaponfire
endif

`Weapontimer will decrease 1 each frame
if Weapontimer => 1 then dec Weapontimer,1

Sync
Loop

`Subs : Weaponfire
Weaponfire:
Raytrace and shoot etc.
inc Weapontimer,100

There's a tutorial on the main page somewhere but this adds bulletlife to a projectile wich is a flying sphere.
I've read objects aren't to be used as bullets, as they can skip other objects wich won't be good. Ray tracing would be better wich I want to implement into my code when I know how to!

The game will be containing more than 1 weapon, so I'd have 1 timer for each weapon.
IMO there should be an easier way to make this.
Regards,

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Millenium7

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Joined: 13th Dec 2004

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Posted: 6th Mar 2012 10:58

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doing anything 'per loop' is not a very effective way to code, frame rate drops will result in everything running slower
Instead, think of everything happening according to time elapsed, irrelevant of your frame/loop rate

+ Code Snippet

Sync On : Sync Rate 60
Backdrop On
global WeaponRate as integer
global WeaponTimer as integer
WeaponRate = 250 // fire rate in milliseconds, 250 = 4 shots per second
WeaponTimer=timer()

do
 WeaponControl()
 sync
loop

function WeaponControl()
 if mouseclick()&&1
  if Timer()-WeaponTimer=>WeaponRate
   // Do stuff to shoot your gun
   text screen width()/2,screen height()-50,"BANG!"
   WeaponTimer=timer()
  endif
 endif
endfunction

You can also implement locking/unlocking of states. Something like

+ Code Snippet

Global WeaponLock as boolean

function WeaponControl()
 if mouseclick()&&1
  if Timer()-WeaponTimer=>WeaponRate and WeaponLock=0
   // Do stuff to shoot your gun
   text screen width()/2,screen height()-50,"BANG!"
   WeaponTimer=timer()
   WeaponLock=1
  endif
 else 
  if timer()-WeaponTimer=>WeaponRate then WeaponLock=0
 endif
endfunction

This will lock/unlock the weapon according to the left mouse button status. However it also abides by the '4 shots per second' rule, so even if you mash the button you can't make it shoot faster than that

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