Re: realtime game controls

Carl Read (carl)
23-Sep-2007/5:42:34-4:00
#43058
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On Sunday, 23-September-2007 at 11:46:38 Anohin Vladimir wrote,

>
>Dear friends,
>
>please show me a way to make better controls for simple game. Now I
>have a code like that:
>
>vis/feel: make vis/feel [
>   detect: func [face event][
>      if event/type = 'key [
>         switch event/key [
>            left  [ x: x - 2 ]
>            right [ x: x + 2 ]
>            up    [ y: y - 2 ]
>            down  [ y: y + 2 ]
>            #"q"   [ quit]
>         ]
>      ]
>    face/effect: make-draw blk x y
>    show face
>    event
>   ]
>]
>
>But controlled face is moving jerky and control keys are "sticky", so
>when a control is pressed and then is unpressed, face is still moving.

I'm not sure of a way around the sticky keys problem, but I would suggest you only do a 'show face' if
X or Y have been altered.  Currently it's happening with any event, which could be slowing things down.
ie, something like this...

     moved: false
     if event/type = 'key [
         switch event/key [
            left  [ x: x - 2 moved: true]
            right [ x: x + 2 moved: true]
            up    [ y: y - 2 moved: true]
            down  [ y: y + 2 moved: true]
            #"q"   [ quit]
         ]
     ]
     face/effect: make-draw blk x y
     if moved [show face]

>Is there a way to do real-time controls?

With the mouse it's quite easy, but keys are either down/up or down/slight-wait/repeat-until-up...  It
just depends what kind of control you need.  If you don't want the repeating keys effect, you'd need to
include a check for the key not being pressed after you've first detected it's been pressed.

-- Carl Read.

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