SM sprite scroll

 

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Part 1/3 of the Scrolling menu set. You must use this behavior in conjunction with the "SCROLL CONTROL" behavior. Attach this to the sprites that you want to scroll. Set "starting speed" and "starting accel" all other parameters are set with the "SCROLL CONTROL" behavior.

--Sprite Scroll part 1/3 of the Scroll Menu set. --Created by Brent Moseley April 2000 --brent099@xoommail.com property mysprite property moveinc property movechange property maxspeed property oldmax property startmax property startaccel on beginsprite me   mysprite = the spritenum of me   movechange = startaccel   maxspeed = startmax   moveinc = 0 end on prepareframe me      if the loch of sprite mysprite > the width of the rect of the stage + 150 then  --RIGHT     the loch of sprite mysprite = -150   end if   -- |   -- | If the sprite goes off the screen then set it back on the other side   -- |   if the loch of sprite mysprite < -150 then     the loch of sprite mysprite = the width of the rect of the stage + 150  --LEFT   end if           -- if it"s moveing right.   if movechange > 0 then       if moveinc < maxspeed then  -- if it"s going slower than target speed.       moveinc = moveinc + movechange --accelerate     else if moveinc > maxspeed then  -- if it"s going faster than target speed.       moveinc = moveinc - movechange --decelerate     end if   end if      -- if it"s moveing left.   if movechange < 0 then       if moveinc > -maxspeed then     --|same as above.       moveinc = moveinc + movechange--|     else if moveinc < -maxspeed then--|       moveinc = moveinc - movechange--|     end if   end if      the loch of sprite mysprite = the loch of sprite mysprite + moveinc  --moves the sprite end --called by the "scroll control" behavior. --sets the speed acceleration. on setmoveinc me ,a ,b   movechange = a --acceleration/deceleration speed   maxspeed = b --maximum(target) speed end --called by the optional "scroll slow down" behavior. --It slows the sprites down regardless of their direction. on goslow me ,a   oldmax = maxspeed      if maxspeed > 0 then     maxspeed = a   else     maxspeed = -a   end if end --Sets the speed back to normal. on gonormal me   maxspeed = oldmax end on getBehaviorDescription   return "Use this behavior in conjunction with the "SCROLL CONTROL" behavior" & RETURN & RETURN & ¬ "Attach this to the sprites that you want to scroll" & RETURN & ¬ "Set "starting speed" and "starting accel" all other parameters are set with the "SCROLL CONTROL" behavior" end on getPropertyDescriptionList me   set pdlist to [:]   addprop pdlist, #startmax, [#comment:"starting speed", #format:#integer, #default:3]   addprop pdlist, #startaccel, [#comment:"starting acceleration", #format:#float, #default:.5, #range: [#min:-2, #max:2]]   return pdlist end getPropertyDescriptionList

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