Simple projectile with gravity

 

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Allows a member to scroll over the movie, by defined parametres...

--Description -------- --Drop onto a sprite to give it simple movement based on a firing angle, --direction, and speed, as well as controlling gravity. --Code ------- property pSpeed property pAngle, pDirection property pX, pY property pDX, pDY property pGravity property pS on beginSprite me   -- Initialise variables   pS = sprite(me.spriteNum)   pX = float(pS.locH)   pY = float(pS.locV)   -- Calculate movement vector   pDX = sin(pAngle / 180.0 * pi()) * pSpeed   pDY = -cos(pAngle / 180.0 * pi()) * pSpeed   -- Flip X direction if wanting to move left   if pDirection = #left then pDX = -pDX end on prepareFrame me   -- Update variables   pX = pX + pDX   pY = pY + pDY   pDY = pDY + pGravity   -- Update sprite position   pS.loc = point(integer(pX), integer(pY)) end on getPropertyDescriptionList me   -- Set up data   tlData = [:]   tlData[#pSpeed] = [#comment: "What speed? (In pixels per update)", #format: #float, #default: 10.0]   tlData[#pAngle] = [#comment: "What angle? (0 = horizontal, 90 = vertically up)", #format: #float, #default: 45.0]   tlData[#pDirection] = [#comment: "Fire left or right?", #format: #symbol, #default: #right, #range: [#left, #right]]   tlData[#pGravity] = [#comment: "Gravity strength? (In pixels per update)", #format: #float, #default: 0.5]   -- Return data   return tlData end