Rotate-a-Sprite

 

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Use on sprites to make them rotate around a given point.

-- Rotate-a-Sprite -- use on sprites to make them rotate around a given point -- the radius is calculated by the sprite"s distance from -- the center point. Speed and direction is adjustable. -- by dirk eismann, d.eismann@medienkonzepte.de property pSprite property pRadius property pCenter property pDpF property pRad property pDir on beginSprite me   pSprite = sprite(me.spriteNum)      -- the distance from the center   x = pCenter[1] - pSprite.loc[1]   y = pCenter[2] - pSprite.loc[2]      -- get the radius   pRadius = sqrt((x*x)+(y*y))   -- angle towards the center   pRad = atan(-x,-y)      -- how the sprite moves   if pDir = #left then       pDpF = pDpF * pi / 180.00   else     pDpF = - pDpF * pi / 180.00   end if end beginSprite on exitFrame me   -- add the per-frame change to the current rad-value   pRad = pRad + pDpF   -- update the sprite"s position   pSprite.loc = point(pRadius * sin(pRad),pRadius * cos(pRad)) + pCenter end exitFrame on getPropertyDescriptionList   description = [:]   description.addProp(#pCenter,[#comment:"Rotate around point:",#format:#point,#default:point(100,100)])   description.addProp(#pDpF,[#comment:"Speed (degrees per frame):",#format:#integer,#range:[#min:1,#max:360],#default:1])   description.addProp(#pDir,[#comment:"Direction:",#format:#symbol,#range:[#left,#right],#default:#right])   return description end getPropertyDescriptionList