Moho Forum

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if os.rename(myfile, myfile) then 
  DoSomething 
end

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result, reason = os.rename(myfile, myfile)

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	-- * Check old size:
	local oldHeight = imageLayer:Height()
	imageLayer:SetSourceImage(imagePath)
	-- * Compare to new size:
	local newHeight = imageLayer:Height()
	-- * Check if difference is significant:
	local heightDifference = math.abs (oldHeight - newHeight)
	if heightDifference < 0.1 then
		heightDifference = 0
	end
	-- * Change size on frame 0 and timeline:
	if heightDifference ~= 0 then --newHeight ~= oldHeight then
		self.changedScale = true
		local heightChange = oldHeight / newHeight
		local scaleChannel = imageLayer.fScale
		local oldScale = scaleChannel:GetValue(0)
		local newScale = oldScale * heightChange
		-- * Main timeline scale channel for this image layer:
		local endKey = scaleChannel:Duration()
		local thisKey = 0
		local keyCount = scaleChannel:CountKeys()
		local keysFound = 0
		local frameNum = endKey
		while keysFound < keyCount do
			thisKey = scaleChannel:GetClosestKeyID(frameNum)
			keyFrameNum = scaleChannel:GetKeyWhen(thisKey)
			keysFound = 1 + keysFound
			-- * Scale it:
			local oldScale = scaleChannel:GetValue(keyFrameNum)
			local newScale = oldScale * heightChange
			scaleChannel:SetValue(keyFrameNum, newScale)
			frameNum = keyFrameNum - 1
		end
		-- * Do all action scale channels for this image layer too:
		for i = 0, scaleChannel:CountActions()-1 do
			local actionChannel = moho:ChannelAsAnimVec3(scaleChannel:Action(i))
			local endKey = actionChannel:Duration()
			local thisKey = 0
			local keyCount = actionChannel:CountKeys()-1 -- * -1 because we don't want to modify frame 0 in actions!
			local keysFound = 0
			local frameNum = endKey
			while keysFound < keyCount do
				thisKey = actionChannel:GetClosestKeyID(frameNum)
				keyFrameNum = actionChannel:GetKeyWhen(thisKey)
				keysFound = 1 + keysFound
				-- * Scale it:
				local oldScale = actionChannel:GetValue(keyFrameNum)
				local newScale = oldScale * heightChange
				actionChannel:SetValue(keyFrameNum, newScale)
				frameNum = keyFrameNum - 1
			end
		end
	end