syncing

[RaverDave]

PlayBASIC Code: [Select]

; PROJECT : playbitz
; AUTHOR  : david wheeler
; CREATED : 16/01/2011
; EDITED  : 16/01/2011
; ---------------------------------------------------------------------
OpenScreen 800,600,16,2

sw=GetScreenWidth()
sh=GetScreenHeight()

   Setfps 60

   ;screenvsync on
xpos=0

makegfx()
repeat
   cls 0
   updateplayer()
   
   Backdrop()
   
   
   if esckey()
         quit=true
   endif
   sync
until quit=true


Function BackDrop()
   ;LockBuffer   
   inkmode 1
   Static baseangle#
   col1=RGBFade($ff0000,SinNewValue(50,baseangle#,20))
   col2=RGBFade($ffff00,CosNewValue(50,baseangle#,20))

   col3=RGBFade($ff00f0,SinNewValue(50,baseangle#*2,20))
   col4=RGBFade($1234,CosNewValue(50,baseangle#*2,20))
   ShadeBox 0,0,GetScreenWidth(),GetScreenHeight(),col1,col2,col3,col4
   baseangle#=Mod(baseangle#+1,360)
   ;UnLockBuffer
EndFunction

function makegfx()
   
   CreateImage 20,16,32
   RenderToImage 20
   box 0,0,15,31,1
   
   rendertoscreen
endfunction

function updateplayer()
   ypos=mousey()
   drawimage 20,xpos,ypos,0
   sync
endfunction

ITrying to refamilairize myself with this playbasic, i have a flicker as you can see and dont know where i am going wrong! thanks for any help

[kevin]

Why are you calling SYNC twice ?

[RaverDave]

well.. if i take out a sync from updateplayer() i dont see the bat image!

[kevin]

of course not.. you're drawing the bat, then covering it with the shadebox.. 

[RaverDave]

hah! of course. I messed about so much i didnt notice! :P
I was using some other language recently where the sprite command kinda had drawing priority! bah!!