local help

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Cruis.In

hey guys

take a look at this

If hit = True 	
		Local frame:Float
		SetAlpha 1.0
		SetRotation 0
		
		DrawImage explosion,targetship.x,targetship.y,frame			
	
		frame :+ 0.5
		If frame > 6 
			hit = False
			frame = 0
		End If
	End If

if i use local frame:float

then frame does not update and the anim image hence does not animate, but if i change that to global it works. I dont understand...why?