View difference between Paste ID: 2c8kGVRc and xhFunCyF

 --[[
 		NPaintPro
 		By NitrogenFingers
 ]]--
 
 --The screen size
 local w,h = term.getSize()
 --Whether or not the program is currently waiting on user input
 local inMenu = false
 --Whether or not a drop down menu is active
 local inDropDown = false
 --Whether or not animation tools are enabled (use -a to turn them on)
 local animated = false
 --Whether or not the text tools are enabled (use -t to turn them on)
 local textual = false
 --Whether or not "blueprint" display mode is on
 local blueprint = false
 --Whether or not the "layer" display is on
 local layerDisplay = false
 --Whether or not the "direction" display is on
 local printDirection = false
 --The tool/mode npaintpro is currently in. Default is "paint"
 --For a list of modes, check out the help file
 local state = "paint"
 --Whether or not the program is presently running
 local isRunning = true
 --The rednet address of the 3D printer, if one has been attached
 local printer = nil
 
 --The list of every frame, containing every image in the picture/animation
 --Note: nfp files always have the picture at frame 1
 local frames = { }
 --How many frames are currently in the given animation.
 local frameCount = 1
 --The Colour Picker column
 local column = {}
 --The currently selected left and right colours
 local lSel,rSel = colours.white,nil
 --The amount of scrolling on the X and Y axis
 local sx,sy = 0,0
 --The alpha channel colour
 --Change this to change default canvas colour
 local alphaC = colours.yellow
 --The currently selected frame. Default is 1
 local sFrame = 1
 --The contents of the image buffer- contains contents, width and height
 local buffer = nil
 --The position, width and height of the selection rectangle
 local selectrect = nil
 
 --The currently calculated required materials
 local requiredMaterials = {}
 --Whether or not required materials are being displayed in the pallette
 local requirementsDisplayed = false
 --A list of the rednet ID's all in-range printers located
 local printerList = { }
 --A list of the names of all in-range printers located. Same as the printerList in reference
 local printerNames = { }
 --The selected printer
 local selectedPrinter = 1
 --The X,Y,Z and facing of the printer
 local px,py,pz,pfx,pfz = 0,0,0,0,0
 --The form of layering used
 local layering = "up"
 
 --The animation state of the selection rectangle and image buffer
 local rectblink = 0
 --The ID for the timer
 local recttimer = nil
 --The radius of the brush tool
 local brushsize = 3
 --Whether or not "record" mode is activated (animation mode only)
 local record = false
 --The time between each frame when in play mode (animation mode only)
 local animtime = 0.3
 
 --The current "cursor position" in text mode
 local cursorTexX,cursorTexY = 1,1
 
 --A list of hexidecimal conversions from numbers to hex digits
 local hexnums = { [10] = "a", [11] = "b", [12] = "c", [13] = "d", [14] = "e" , [15] = "f" }
 --The NPaintPro logo (divine, isn't it?)
 local logo = {
 "fcc              3   339";
 " fcc          9333    33";
 "  fcc        933 333  33";
 "   fcc       933  33  33";
 "    fcc      933   33 33";
 "     c88     333   93333";
 "     888     333    9333";
 "      333 3  333     939";
 }
 --The Layer Up and Layer Forward printing icons
 local layerUpIcon = {
 	"0000000";
 	"0088880";
 	"0888870";
 	"07777f0";
 	"0ffff00";
 	"0000000";
 }
 local layerForwardIcon = {
 	"0000000";
 	"000fff0";
 	"00777f0";
 	"0888700";
 	"0888000";
-local ddModes = { { "paint", "brush", "pippette", "flood", "move", "clear", "select", name = "painting" }, { "alpha to left", "alpha to right", "blueprint on", "layers on", name = "display" }, "help", { "print", "save", "exit", name = "file" }, name = "menu" }
+
 }
 --The available menu options in the ctrl menu
 local mChoices = {"Save","Exit"}
 --The available modes from the dropdown menu- tables indicate submenus (include a name!)
 local ddModes = { { "paint", "brush", "pippette", "flood", "move", "clear", "select", name = "painting" }, { "alpha to left", "alpha to right", "blueprint on", name = "display" }, "help", { "print", "save", "exit", name = "file" }, name = "menu" }
 --The available modes from the selection right-click menu
 local srModes = { "cut", "copy", "paste", "clear", "hide", name = "selection" }
 --The list of available help topics for each mode 127
 local helpTopics = {
 	[1] = {
 		name = "Paint Mode",
 		key = nil,
 		animonly = false,
 		message = "The default mode for NPaintPro, for painting pixels."
 		.." Controls here that are not overridden will apply for all other modes. Leaving a mode by selecting that mode "
 		.." again will always send the user back to paint mode.",
 		controls = {
 			{ "Arrow keys", "Scroll the canvas" },
 			{ "Left Click", "Paint/select left colour" },
 			{ "Right Click", "Paint/select right colour" },
 			{ "Z Key", "Clear image on screen" },
 			{ "Tab Key", "Hide selection rectangle if visible" },
 			{ "Q Key", "Set alpha mask to left colour" },
 			{ "W Key", "Set alpha mask to right colour" },
 			{ "Number Keys", "Swich between frames 1-9" },
 			{ "</> keys", "Move to the next/last frame" },
 			{ "R Key", "Removes every frame after the current frame"}
 		}
 	},
 	[2] = {
 		name = "Brush Mode",
 		key = "b",
 		animonly = false,
 		message = "Brush mode allows painting a circular area of variable diameter rather than a single pixel, working in "..
 		"the exact same way as paint mode in all other regards.",
 		controls = {
 			{ "Left Click", "Paints a brush blob with the left colour" },
 			{ "Right Click", "Paints a brush blob with the right colour" },
 			{ "Number Keys", "Changes the radius of the brush blob from 2-9" }
 		}
 	},
 	[3] = {
 		name = "Pippette Mode",
 		key = "p",
 		animonly = false,
 		message = "Pippette mode allows the user to click the canvas and set the colour clicked to the left or right "..
 		"selected colour, for later painting.",
 		controls = {
 			{ "Left Click", "Sets clicked colour to the left selected colour" },
 			{ "Right Click", "Sets clicked colour to the right selected colour" }
 		}
 	},
 	[4] = {
 		name = "Move Mode",
 		key = "m",
 		animonly = false,
 		message = "Mode mode allows the moving of the entire image on the screen. This is especially useful for justifying"..
 		" the image to the top-left for animations or game assets.",
 		controls = {
 			{ "Left/Right Click", "Moves top-left corner of image to selected square" },
 			{ "Arrow keys", "Moves image one pixel in any direction" }
 		}
 	},
 	[5] = {
 		name = "Flood Mode (NYI)",
 		key = "f",
 		animonly = false,
 		message = "Flood mode allows the changing of an area of a given colour to that of the selected colour. "..
 		"The tool uses a flood4 algorithm and will not fill diagonally. Transparency cannot be flood filled.",
 		controls = {
 			{ "Left Click", "Flood fills selected area to left colour" },
 			{ "Right Click", "Flood fills selected area to right colour" }
 		}
 	},
 	[6] = {
 		name = "Select Mode",
 		key = "s",
 		animonly = false,
 		message = "Select mode allows the creation and use of the selection rectangle, to highlight specific areas on "..
 		"the screen and perform operations on the selected area of the image. The selection rectangle can contain an "..
 		"image on the clipboard- if it does, the image will flash inside the rectangle, and the rectangle edges will "..
 		"be light grey instead of dark grey.",
 		controls = {
 			{ "C Key", "Copy: Moves selection into the clipboard" },
 			{ "X Key", "Cut: Clears canvas under the rectangle, and moves it into the clipboard" },
 			{ "V Key", "Paste: Copys clipboard to the canvas" },
 			{ "Z Key", "Clears clipboard" },
 			{ "Left Click", "Moves top-left corner of rectangle to selected pixel" },
 			{ "Right Click", "Opens selection menu" },
 			{ "Arrow Keys", "Moves rectangle one pixel in any direction" }
 		}
 	},
 	[7] = {
 		name = "Corner Select Mode",
 		key = nil,
 		animonly = false,
 		message = "If a selection rectangle isn't visible, this mode is selected automatically. It allows the "..
 		"defining of the corners of the rectangle- one the top-left and bottom-right corners have been defined, "..
 		"NPaintPro switches to selection mode. Note rectangle must be at least 2 pixels wide and high.",
 		controls = {
 			{ "Left/Right Click", "Defines a corner of the selection rectangle" }
 		}
 	},
 	[8] = {
 		name = "Play Mode",
 		key = "space",
 		animonly = true,
 		message = "Play mode will loop through each frame in your animation at a constant rate. Editing tools are "..
 		"locked in this mode, and the coordinate display will turn green to indicate it is on.",
 		controls = {
 			{ "</> Keys", "Increases/Decreases speed of the animation" },
 			{ "Space Bar", "Returns to paint mode" }
 		}
 	},
 	[9] = {
 		name = "Record Mode",
 		key = "\\",
 		animonly = true,
 		message = "Record mode is not a true mode, but influences how other modes work. Changes made that modify the "..
 		"canvas in record mode will affect ALL frames in the animation. The coordinates will turn red to indicate that "..
 		"record mode is on.",
 		controls = {
 			{ "", "Affects:" },
 			{ "- Paint Mode", "" },
 			{ "- Brush Mode", "" },
 			{ "- Cut and Paste in Select Mode", ""},
 			{ "- Move Mode", ""}
 		}
 	},
 	[10] = {
 		name = "Help Mode",
 		key = "h",
 		animonly = false,
 		message = "Displays this help screen. Clicking on options will display help on that topic. Clicking out of the screen"..
 		" will leave this mode.",
 		controls = {
 			{ "Left/Right Click", "Displays a topic/Leaves the mode" }
 		}
 	},
 	[11] = {
 		name = "File Mode",
 		keys = nil,
 		animonly = false,
 		message = "Clicking on the mode display at the bottom of the screen will open the options menu. Here you can"..
 		" activate all of the modes in the program with a simple mouse click. Pressing left control will open up the"..
 		" file menu automatically.",
 		controls = {
 			{ "leftCtrl", "Opens the file menu" },
 			{ "leftAlt", "Opens the paint menu" }
 
 		}
 	},
 	[12] = {
 		name = "About NPaintPro",
 		keys = nil,
 		animonly = false,
 		message = "NPaintPro: The feature-bloated paint program for ComputerCraft by Nitrogen Fingers.",
 		controls = {
 			{ "Testers:", " "},
 			{ " ", "Faubiguy"},
 			{ " ", "TheOriginalBIT"}
 		}
 	}
 }
 --The "bounds" of the image- the first/last point on both axes where a pixel appears
 local toplim,botlim,leflim,riglim = nil,nil,nil,nil
 --The selected path
 local sPath = nil
 
 --[[
 			Section:  Helpers
 ]]--
 
 --[[Converts a colour parameter into a single-digit hex coordinate for the colour
     Params: colour:int = The colour to be converted
 	Returns:string A string conversion of the colour
 ]]--
 local function getHexOf(colour)
 	if not colour or not tonumber(colour) then
 		return " "
 	end
 	local value = math.log(colour)/math.log(2)
 	if value > 9 then
 		value = hexnums[value]
 	end
 	return value
 end
 
 --[[Converts a hex digit into a colour value
 	Params: hex:?string = the hex digit to be converted
 	Returns:string A colour value corresponding to the hex, or nil if the character is invalid
 ]]--
 local function getColourOf(hex)
 	local value = tonumber(hex, 16)
 	if not value then return nil end
 	value = math.pow(2,value)
 	return value
 end
 
 --[[Finds the biggest and smallest bounds of the image- the outside points beyond which pixels do not appear
 	These values are assigned to the "lim" parameters for access by other methods
 	Params: forAllFrames:bool = True if all frames should be used to find bounds, otherwise false or nil
 	Returns:nil
 ]]--
 local function updateImageLims(forAllFrames)
 	local f,l = sFrame,sFrame
 	if forAllFrames == true then f,l = 1,framecount end
 
 	toplim,botlim,leflim,riglim = nil,nil,nil,nil
 	for locf = f,l do
 		for y,_ in pairs(frames[locf]) do
 			for x,_ in pairs(frames[locf][y]) do
 				if frames[locf][y][x] ~= nil then
 					if leflim == nil or x < leflim then leflim = x end
 					if toplim == nil or y < toplim then toplim = y end
 					if riglim == nil or x > riglim then riglim = x end
 					if botlim == nil or y > botlim then botlim = y end
 				end
 			end
 		end
 	end
 end
 
 --[[Determines how much of each material is required for a print. Done each time printing is called.
 	Params: none
 	Returns:table A complete list of how much of each material is required.
 ]]--
 function calculateMaterials()
 	updateImageLims(animated)
 	requiredMaterials = {}
 	for i=1,16 do
 		requiredMaterials[i] = 0
 	end
 
 	if not toplim then return end
 
 	for i=1,#frames do
 		for y = toplim, botlim do
 			for x = leflim, riglim do
 				if type(frames[i][y][x]) == "number" then
 					requiredMaterials[math.log10(frames[i][y][x])/math.log10(2) + 1] =
 						requiredMaterials[math.log10(frames[i][y][x])/math.log10(2) + 1] + 1
 				end
 			end
 		end
 	end
 end
 
 
 --[[Updates the rectangle blink timer. Should be called anywhere events are captured, along with a timer capture.
 	Params: nil
 	Returns:nil
 ]]--
 local function updateTimer(id)
 	if id == recttimer then
 		recttimer = os.startTimer(0.5)
 		rectblink = (rectblink % 2) + 1
 	end
 end
 
 --[[Constructs a message based on the state currently selected
 	Params: nil
 	Returns:string A message regarding the state of the application
 ]]--
 local function getStateMessage()
 	local msg = " "..string.upper(string.sub(state, 1, 1))..string.sub(state, 2, #state).." mode"
 	if state == "brush" then msg = msg..", size="..brushsize end
 	return msg
 end
 
 --[[Calls the rednet_message event, but also looks for timer events to keep then
 	system timer ticking.
 	Params: timeout:number how long before the event times out
 	Returns:number the id of the sender
 		   :number the message send
 ]]--
 local function rsTimeReceive(timeout)
 	local timerID
 	if timeout then timerID = os.startTimer(timeout) end
 
 	local id,key,msg = nil,nil
 	while true do
 		id,key,msg = os.pullEvent()
 
 		if id == "timer" then
 			if key == timerID then return
 			else updateTimer(key) end
 		end
 		if id == "rednet_message" then
 			return key,msg
 		end
 	end
 end
 
 --[[Draws a picture, in paint table format on the screen
 	Params: image:table = the image to display
 			xinit:number = the x position of the top-left corner of the image
 			yinit:number = the y position of the top-left corner of the image
 			alpha:number = the color to display for the alpha channel. Default is white.
 	Returns:nil
 ]]--
 local function drawPictureTable(image, xinit, yinit, alpha)
 	if not alpha then alpha = 1 end
 	for y=1,#image do
 		for x=1,#image[y] do
 			term.setCursorPos(xinit + x-1, yinit + y-1)
 			local col = getColourOf(string.sub(image[y], x, x))
 			if not col then col = alpha end
 			term.setBackgroundColour(col)
 			term.write(" ")
 		end
 	end
 end
 
 --[[
 			Section: Loading
 ]]--
 
 --[[Loads a non-animted paint file into the program
 	Params: path:string = The path in which the file is located
 	Returns:nil
 ]]--
 local function loadNFP(path)
 	sFrame = 1
 	frames[sFrame] = { }
 	if fs.exists(path) then
 		local file = io.open(path, "r" )
 		local sLine = file:read()
 		local num = 1
 		while sLine do
 			table.insert(frames[sFrame], num, {})
 			for i=1,#sLine do
 				frames[sFrame][num][i] = getColourOf(string.sub(sLine,i,i))
 			end
 			num = num+1
 			sLine = file:read()
 		end
 		file:close()
 	end
 end
 
 --[[Saves a non-animated paint file to the specified path
 	Params: path:string = The path to save the file to
 	Returns:nil
 ]]--
 local function saveNFP(path)
 	local sDir = string.sub(sPath, 1, #sPath - #fs.getName(sPath))
 	if not fs.exists(sDir) then
 		fs.makeDir(sDir)
 	end
 
 	local file = io.open(path, "w")
 	updateImageLims(false)
 	if not toplim then
 		file:close()
 		return
 	end
 	for y=1,botlim do
 		local line = ""
 		if frames[sFrame][y] then
 			for x=1,riglim do
 				line = line..getHexOf(frames[sFrame][y][x])
 			end
 		end
 		file:write(line.."\n")
 	end
 	file:close()
 end
 
 --[[Loads an animated paint file into the program
 	Params: path:string = The path in which the file is located
 	Returns:nil
 ]]--
 local function loadNFA(path)
 	frames[sFrame] = { }
 	if fs.exists(path) then
 		local file = io.open(path, "r" )
 		local sLine = file:read()
 		local num = 1
 		while sLine do
 			table.insert(frames[sFrame], num, {})
 			if sLine == "~" then
 				sFrame = sFrame + 1
 				frames[sFrame] = { }
 				num = 1
 			else
 				for i=1,#sLine do
 					frames[sFrame][num][i] = getColourOf(string.sub(sLine,i,i))
 				end
 				num = num+1
 			end
 			sLine = file:read()
 		end
 		file:close()
 	end
 	framecount = sFrame
 	sFrame = 1
 end
 
 --[[Saves a animated paint file to the specified path
 	Params: path:string = The path to save the file to
 	Returns:nil
 ]]--
 local function saveNFA(path)
 	local file = io.open(path, "w")
 	updateImageLims(true)
 	if not toplim then
 		file:close()
 		return
 	end
 	for i=1,#frames do
 		for y=1,botlim do
 			local line = ""
 			if frames[i][y] then
 				for x=1,riglim do
 					line = line..getHexOf(frames[i][y][x])
 				end
 			end
 			file:write(line.."\n")
 		end
 		if i < #frames then file:write("~\n") end
 	end
 	file:close()
 end
 
 --[[Initializes the program, by loading in the paint file. Called at the start of each program.
 	Params: none
 	Returns:nil
 ]]--
 local function init()
 	if animated then
 		loadNFA(sPath)
 		table.insert(ddModes, #ddModes, { "record", "play", name = "anim" })
 		table.insert(ddModes, #ddModes, { "go to", "remove", name = "frames"})
 		table.insert(ddModes[2], #ddModes, "layers on")
 	else loadNFP(sPath) end
 
 	for i=0,15 do
 		table.insert(column, math.pow(2,i))
 	end
 end
 
 --[[
 			Section: Drawing
 ]]--
 
 
-	msg = "Thanks to faubiguy for testing"
+
-	term.setCursorPos(w/2 - #msg/2, h)
+
 	Params: none
 	Returns:nil
 ]]--
 local function drawLogo()
 	term.setBackgroundColour(colours.white)
 	term.clear()
 	drawPictureTable(logo, w/2 - #logo[1]/2, h/2 - #logo/2, colours.white)
 	term.setBackgroundColour(colours.white)
 	term.setTextColour(colours.black)
 	local msg = "NPaintPro"
 	term.setCursorPos(w/2 - #msg/2, h-3)
 	term.write(msg)
 	msg = "By NitrogenFingers"
 	term.setCursorPos(w/2 - #msg/2, h-2)
 	term.write(msg)
 
 	os.pullEvent()
 end
 
 --[[Clears the display to the alpha channel colour, draws the canvas, the image buffer and the selection
 	rectanlge if any of these things are present.
 	Params: none
 	Returns:nil
 ]]--
 local function drawCanvas()
 	--We have to readjust the position of the canvas if we're printing
 	turtlechar = "@"
 	if state == "active print" then
 		if layering == "up" then
 			if py >= 1 and py <= #frames then
 				sFrame = py
 			end
 			if pz < sy then sy = pz
 			elseif pz > sy + h - 1 then sy = pz + h - 1 end
 			if px < sx then sx = px
 			elseif px > sx + w - 2 then sx = px + w - 2 end
 		else
 			if pz >= 1 and pz <= #frames then
 				sFrame = pz
 			end
 
 			if py < sy then sy = py
 			elseif py > sy + h - 1 then sy = py + h - 1 end
 			if px < sx then sx = px
 			elseif px > sx + w - 2 then sx = px + w - 2 end
 		end
 
 		if pfx == 1 then turtlechar = ">"
 		elseif pfx == -1 then turtlechar = "<"
 		elseif pfz == 1 then turtlechar = "V"
 		elseif pfz == -1 then turtlechar = "^"
 		end
 	end
 
 	--Picture next
 	local topLayer, botLayer
 	if layerDisplay then
 		topLayer = sFrame
 		botLayer = 1
 	else
 		topLayer,botLayer = sFrame,sFrame
 	end
 
 	for currframe = botLayer,topLayer,1 do
 		for y=sy+1,sy+h-1 do
 			if frames[currframe][y] then
 				for x=sx+1,sx+w-2 do
 					term.setCursorPos(x-sx,y-sy)
 					if frames[currframe][y][x] then
 						term.setBackgroundColour(frames[currframe][y][x])
 						term.write(" ")
 					else
 						tileExists = false
 						for i=currframe-1,botLayer,-1 do
 							if frames[i][y][x] then
 								tileExists = true
 								break
 							end
 						end
 
 						if not tileExists then
 							if blueprint then
 								term.setBackgroundColour(colours.blue)
 								term.setTextColour(colours.white)
 								if x == sx+1 and y % 4 == 1 then
 									term.write(""..((y/4) % 10))
 								elseif y == sy + 1 and x % 4 == 1 then
 									term.write(""..((x/4) % 10))
 								elseif x % 2 == 1 and y % 2 == 1 then
 									term.write("+")
 								elseif x % 2 == 1 then
 									term.write("|")
 								elseif y % 2 == 1 then
 									term.write("-")
 								else
 									term.write(" ")
 								end
 							else
 								term.setBackgroundColour(alphaC)
 								term.write(" ")
 							end
 						end
 					end
 				end
 			else
 				for x=sx+1,sx+w-2 do
 					term.setCursorPos(x-sx,y-sy)
 
 					tileExists = false
 					for i=currframe-1,botLayer,-1 do
 						if frames[i][y] and frames[i][y][x] then
 							tileExists = true
 							break
 						end
 					end
 
 					if not tileExists then
 						if blueprint then
 							term.setBackgroundColour(colours.blue)
 							term.setTextColour(colours.white)
 							if x == sx+1 and y % 4 == 1 then
 								term.write(""..((y/4) % 10))
 							elseif y == sy + 1 and x % 4 == 1 then
 								term.write(""..((x/4) % 10))
 							elseif x % 2 == 1 and y % 2 == 1 then
 								term.write("+")
 							elseif x % 2 == 1 then
 								term.write("|")
 							elseif y % 2 == 1 then
 								term.write("-")
 							else
 								term.write(" ")
 							end
 						else
 							term.setBackgroundColour(alphaC)
 							term.write(" ")
 						end
 					end
 				end
 			end
 		end
 	end
 
 	--Then the printer, if he's on
 	if state == "active print" then
 		local bgColour = alphaC
 		if layering == "up" then
 			term.setCursorPos(px-sx,pz-sy)
 			if frames[sFrame] and frames[sFrame][pz-sy] and frames[sFrame][pz-sy][px-sx] then
 				bgColour = frames[sFrame][pz-sy][px-sx]
 			elseif blueprint then bgColour = colours.blue end
 		else
 			term.setCursorPos(px-sx,py-sy)
 			if frames[sFrame] and frames[sFrame][py-sy] and frames[sFrame][py-sy][px-sx] then
 				bgColour = frames[sFrame][py-sy][px-sx]
 			elseif blueprint then bgColour = colours.blue end
 		end
 
 		term.setBackgroundColour(bgColour)
 		if bgColour == colours.black then term.setTextColour(colours.white)
 		else term.setTextColour(colours.black) end
 
 		term.write(turtlechar)
 	end
 
 	--Then the buffer
 	if selectrect then
 		if buffer and rectblink == 1 then
 		for y=selectrect.y1, math.min(selectrect.y2, selectrect.y1 + buffer.height-1) do
 			for x=selectrect.x1, math.min(selectrect.x2, selectrect.x1 + buffer.width-1) do
 				if buffer.contents[y-selectrect.y1+1][x-selectrect.x1+1] then
 					term.setCursorPos(x+sx,y+sy)
 					term.setBackgroundColour(buffer.contents[y-selectrect.y1+1][x-selectrect.x1+1])
 					term.write(" ")
 				end
 			end
 		end
 		end
 
 		--This draws the "selection" box
 		local add = nil
 		if buffer then
 			term.setBackgroundColour(colours.lightGrey)
 		else
 			term.setBackgroundColour(colours.grey)
 		end
 		for i=selectrect.x1, selectrect.x2 do
 			add = (i + selectrect.y1 + rectblink) % 2 == 0
 			term.setCursorPos(i-sx,selectrect.y1-sy)
 			if add then term.write(" ") end
 			add = (i + selectrect.y2 + rectblink) % 2 == 0
 			term.setCursorPos(i-sx,selectrect.y2-sy)
 			if add then term.write(" ") end
 		end
 		for i=selectrect.y1 + 1, selectrect.y2 - 1 do
 			add = (i + selectrect.x1 + rectblink) % 2 == 0
 			term.setCursorPos(selectrect.x1-sx,i-sy)
 			if add then term.write(" ") end
 			add = (i + selectrect.x2 + rectblink) % 2 == 0
 			term.setCursorPos(selectrect.x2-sx,i-sy)
 			if add then term.write(" ") end
 		end
 	end
 end
 
 --[[Draws the colour picker on the right side of the screen, the colour pallette and the footer with any
 	messages currently being displayed
 	Params: none
 	Returns:nil
 ]]--
 local function drawInterface()
 	--Picker
 	for i=1,#column do
 		term.setCursorPos(w-1, i)
 		term.setBackgroundColour(column[i])
 		if state == "print" then
 			if i == 16 then
 				term.setTextColour(colours.white)
 			else
 				term.setTextColour(colours.black)
 			end
 			if requirementsDisplayed then
 				if requiredMaterials[i] < 10 then term.write(" ") end
 				term.setCursorPos(w-#tostring(requiredMaterials[i])+1, i)
 				term.write(requiredMaterials[i])
 			else
 				if i < 10 then term.write(" ") end
 				term.write(i)
 			end
 		else
 			term.write("  ")
 		end
 	end
 	term.setCursorPos(w-1,#column+1)
 	term.setBackgroundColour(colours.black)
 	term.setTextColour(colours.red)
 	term.write("XX")
 	--Pallette
 	term.setCursorPos(w-1,h-1)
 	if not lSel then
 		term.setBackgroundColour(colours.black)
 		term.setTextColour(colours.red)
 		term.write("X")
 	else
 		term.setBackgroundColour(lSel)
 		term.setTextColour(lSel)
 		term.write(" ")
 	end
 	if not rSel then
 		term.setBackgroundColour(colours.black)
 		term.setTextColour(colours.red)
 		term.write("X")
 	else
 		term.setBackgroundColour(rSel)
 		term.setTextColour(rSel)
 		term.write(" ")
 	end
 	--Footer
 	if inMenu then return end
 
 	term.setCursorPos(1, h)
 	term.setBackgroundColour(colours.lightGrey)
 	term.setTextColour(colours.grey)
 	term.clearLine()
 	if inDropDown then
 		term.write(string.rep(" ", 6))
 	else
 		term.setBackgroundColour(colours.grey)
 		term.setTextColour(colours.lightGrey)
 		term.write("menu  ")
 	end
 	term.setBackgroundColour(colours.lightGrey)
 	term.setTextColour(colours.grey)
 	term.write(getStateMessage())
 
 	local coords="X:"..sx.." Y:"..sy
 	if animated then coords = coords.." Frame:"..sFrame.."/"..framecount.."   " end
 	term.setCursorPos(w-#coords+1,h)
 	if state == "play" then term.setBackgroundColour(colours.lime)
 	elseif record then term.setBackgroundColour(colours.red) end
 	term.write(coords)
 
 	if animated then
 		term.setCursorPos(w-1,h)
 		term.setBackgroundColour(colours.grey)
 		term.setTextColour(colours.lightGrey)
 		term.write("<>")
 	end
 end
 
 --[[Runs an interface where users can select topics of help. Will return once the user quits the help screen.
 	Params: none
 	Returns:nil
 ]]--
 local function drawHelpScreen()
 	local selectedHelp = nil
 	while true do
 		term.setBackgroundColour(colours.lightGrey)
 		term.clear()
 		if not selectedHelp then
 			term.setCursorPos(4, 1)
 			term.setTextColour(colours.brown)
 			term.write("Available modes (click for info):")
 			for i=1,#helpTopics do
 				term.setCursorPos(2, 2 + i)
 				term.setTextColour(colours.black)
 				term.write(helpTopics[i].name)
 				if helpTopics[i].key then
 					term.setTextColour(colours.red)
 					term.write(" ("..helpTopics[i].key..")")
 				end
 			end
 			term.setCursorPos(4,h)
 			term.setTextColour(colours.black)
 			term.write("Press any key to exit")
 		else
 			term.setCursorPos(4,1)
 			term.setTextColour(colours.brown)
 			term.write(helpTopics[selectedHelp].name)
 			if helpTopics[selectedHelp].key then
 				term.setTextColour(colours.red)
 				term.write(" ("..helpTopics[selectedHelp].key..")")
 			end
 			term.setCursorPos(1,3)
 			term.setTextColour(colours.black)
 			print(helpTopics[selectedHelp].message.."\n")
 			for i=1,#helpTopics[selectedHelp].controls do
 				term.setTextColour(colours.brown)
 				term.write(helpTopics[selectedHelp].controls[i][1].." ")
 				term.setTextColour(colours.black)
 				print(helpTopics[selectedHelp].controls[i][2])
 			end
 		end
 
 		local id,p1,p2,p3 = os.pullEvent()
 
 		if id == "timer" then updateTimer(p1)
 		elseif id == "key" then
 			if selectedHelp then selectedHelp = nil
 			else break end
 		elseif id == "mouse_click" then
 			if not selectedHelp then
 				if p3 >=3 and p3 <= 2+#helpTopics then
 					selectedHelp = p3-2
 				else break end
 			else
 				selectedHelp = nil
 			end
 		end
 	end
 end
 
 --[[Draws a message in the footer bar. A helper for DrawInterface, but can be called for custom messages, if the
 	inMenu paramter is set to true while this is being done (remember to set it back when done!)
 	Params: message:string = The message to be drawn
 	Returns:nil
 ]]--
 local function drawMessage(message)
 	term.setCursorPos(1,h)
 	term.setBackgroundColour(colours.lightGrey)
 	term.setTextColour(colours.grey)
 	term.clearLine()
 	term.write(message)
 end
 
 --[[
 			Section: Generic Interfaces
 ]]--
 
 
 --[[One of my generic text printing methods, printing a message at a specified position with width and offset.
 	No colour materials included.
 	Params: msg:string = The message to print off-center
 			height:number = The starting height of the message
 			width:number = The limit as to how many characters long each line may be
 			offset:number = The starting width offset of the message
 	Returns:number the number of lines used in printing the message
 ]]--
 local function wprintOffCenter(msg, height, width, offset)
 	local inc = 0
 	local ops = 1
 	while #msg - ops > width do
 		local nextspace = 0
 		while string.find(msg, " ", ops + nextspace) and
 				string.find(msg, " ", ops + nextspace) - ops < width do
 			nextspace = string.find(msg, " ", nextspace + ops) + 1 - ops
 		end
 		local ox,oy = term.getCursorPos()
 		term.setCursorPos(width/2 - (nextspace)/2 + offset, height + inc)
 		inc = inc + 1
 		term.write(string.sub(msg, ops, nextspace + ops - 1))
 		ops = ops + nextspace
 	end
 	term.setCursorPos(width/2 - #string.sub(msg, ops)/2 + offset, height + inc)
 	term.write(string.sub(msg, ops))
 
 	return inc + 1
 end
 
 --[[Draws a message that must be clicked on or a key struck to be cleared. No options, so used for displaying
 	generic information.
 	Params: ctitle:string = The title of the confirm dialogue
 			msg:string = The message displayed in the dialogue
 	Returns:nil
 ]]--
 local function displayConfirmDialogue(ctitle, msg)
 	local dialogoffset = 8
 	--We actually print twice- once to get the lines, second time to print proper. Easier this way.
 	local lines = wprintOffCenter(msg, 5, w - (dialogoffset+2) * 2, dialogoffset + 2)
 
 	term.setCursorPos(dialogoffset, 3)
 	term.setBackgroundColour(colours.grey)
 	term.setTextColour(colours.lightGrey)
 	term.write(string.rep(" ", w - dialogoffset * 2))
 	term.setCursorPos(dialogoffset + (w - dialogoffset * 2)/2 - #ctitle/2, 3)
 	term.write(ctitle)
 	term.setTextColour(colours.grey)
 	term.setBackgroundColour(colours.lightGrey)
 	term.setCursorPos(dialogoffset, 4)
 	term.write(string.rep(" ", w - dialogoffset * 2))
 	for i=5,5+lines do
 		term.setCursorPos(dialogoffset, i)
 		term.write(" "..string.rep(" ", w - (dialogoffset) * 2 - 2).." ")
 	end
 	wprintOffCenter(msg, 5, w - (dialogoffset+2) * 2, dialogoffset + 2)
 
 	--In the event of a message, the player hits anything to continue
 	while true do
 		local id,key = os.pullEvent()
 		if id == "timer" then updateTimer(key);
 		elseif id == "key" or id == "mouse_click" or id == "mouse_drag" then break end
 	end
 end
 
 --[[Produces a nice dropdown menu based on a table of strings. Depending on the position, this will auto-adjust the position
 	of the menu drawn, and allows nesting of menus and sub menus. Clicking anywhere outside the menu will cancel and return nothing
 	Params: x:int = the x position the menu should be displayed at
 			y:int = the y position the menu should be displayed at
 			options:table = the list of options available to the user, as strings or submenus (tables of strings, with a name parameter)
 	Returns:string the selected menu option.
 ]]--
 local function displayDropDown(x, y, options)
 	inDropDown = true
 	--Figures out the dimensions of our thing
 	local longestX = #options.name
 	for i=1,#options do
 		local currVal = options[i]
 		if type(currVal) == "table" then currVal = currVal.name end
 
 		longestX = math.max(longestX, #currVal)
 	end
 	local xOffset = math.max(0, longestX - ((w-2) - x) + 1)
 	local yOffset = math.max(0, #options - ((h-1) - y))
 
 	local clickTimes = 0
 	local tid = nil
 	local selection = nil
 	while clickTimes < 2 do
 		drawCanvas()
 		drawInterface()
 
 		term.setCursorPos(x-xOffset,y-yOffset)
 		term.setBackgroundColour(colours.grey)
 		term.setTextColour(colours.lightGrey)
 		term.write(options.name..string.rep(" ", longestX-#options.name + 2))
 
 		for i=1,#options do
 			term.setCursorPos(x-xOffset, y-yOffset+i)
 			if i==selection and clickTimes % 2 == 0 then
 				term.setBackgroundColour(colours.grey)
 				term.setTextColour(colours.lightGrey)
 			else
 				term.setBackgroundColour(colours.lightGrey)
 				term.setTextColour(colours.grey)
 			end
 			local currVal = options[i]
 			if type(currVal) == "table" then
 				term.write(currVal.name..string.rep(" ", longestX-#currVal.name + 1))
 				term.setBackgroundColour(colours.grey)
 				term.setTextColour(colours.lightGrey)
 				term.write(">")
 			else
 				term.write(currVal..string.rep(" ", longestX-#currVal + 2))
 			end
 		end
 
 		local id, p1, p2, p3 = os.pullEvent()
 		if id == "timer" then
 			if p1 == tid then
 				clickTimes = clickTimes + 1
 				if clickTimes > 2 then
 					break
 				else
 					tid = os.startTimer(0.1)
 				end
 			else
 				updateTimer(p1)
 				drawCanvas()
 				drawInterface()
 			end
 		elseif id == "mouse_click" then
 			if p2 >=x-xOffset and p2 <= x-xOffset + longestX + 1 and p3 >= y-yOffset+1 and p3 <= y-yOffset+#options then
 				selection = p3-(y-yOffset)
 				tid = os.startTimer(0.1)
 			else
 				selection = ""
 				break
 			end
 		end
 	end
 
 	if type(selection) == "number" then
 		selection = options[selection]
 	end
 
 	if type(selection) == "string" then
 		inDropDown = false
 		return selection
 	elseif type(selection) == "table" then
 		return displayDropDown(x, y, selection)
 	end
 end
 
 --[[A custom io.read() function with a few differences- it limits the number of characters being printed,
 	waits a 1/100th of a second so any keys still in the event library are removed before input is read and
 	the timer for the selectionrectangle is continuously updated during the process.
 	Params: lim:int = the number of characters input is allowed
 	Returns:string the inputted string, trimmed of leading and tailing whitespace
 ]]--
 local function readInput(lim)
 	term.setCursorBlink(true)
 
 	local inputString = ""
 	if not lim or type(lim) ~= "number" or lim < 1 then lim = w - ox end
 	local ox,oy = term.getCursorPos()
 	--We only get input from the footer, so this is safe. Change if recycling
 	term.setBackgroundColour(colours.lightGrey)
 	term.setTextColour(colours.grey)
 	term.write(string.rep(" ", lim))
 	term.setCursorPos(ox, oy)
 	--As events queue immediately, we may get an unwanted key... this will solve that problem
 	local inputTimer = os.startTimer(0.01)
 	local keysAllowed = false
 
 	while true do
 		local id,key = os.pullEvent()
 
 		if keysAllowed then
 			if id == "key" and key == 14 and #inputString > 0 then
 				inputString = string.sub(inputString, 1, #inputString-1)
 				term.setCursorPos(ox + #inputString,oy)
 				term.write(" ")
 			elseif id == "key" and key == 28 and inputString ~= string.rep(" ", #inputString) then
 				break
 			elseif id == "key" and key == keys.leftCtrl then
 				return ""
 			elseif id == "char" and #inputString < lim then
 				inputString = inputString..key
 			end
 		end
 
 		if id == "timer" then
 			if key == inputTimer then
 				keysAllowed = true
 			else
 				updateTimer(key)
 				drawCanvas()
 				drawInterface()
 				term.setBackgroundColour(colours.lightGrey)
 				term.setTextColour(colours.grey)
 			end
 		end
 		term.setCursorPos(ox,oy)
 		term.write(inputString)
 		term.setCursorPos(ox + #inputString, oy)
 	end
 
 	while string.sub(inputString, 1, 1) == " " do
 		inputString = string.sub(inputString, 2, #inputString)
 	end
 	while string.sub(inputString, #inputString, #inputString) == " " do
 		inputString = string.sub(inputString, 1, #inputString-1)
 	end
 	term.setCursorBlink(false)
 
 	return inputString
 end
 
 --[[
 			Section: Image tools
 ]]--
 
 
 --[[Copies all pixels beneath the selection rectangle into the image buffer. Empty buffers are converted to nil.
 	Params: removeImage:bool = true if the image is to be erased after copying, false otherwise
 	Returns:nil
 ]]--
 local function copyToBuffer(removeImage)
 	buffer = { width = selectrect.x2 - selectrect.x1 + 1, height = selectrect.y2 - selectrect.y1 + 1, contents = { } }
 
 	local containsSomething = false
 	for y=1,buffer.height do
 		buffer.contents[y] = { }
 		local f,l = sFrame,sFrame
 		if record then f,l = 1, framecount end
 
 		for fra = f,l do
 			if frames[fra][selectrect.y1 + y - 1] then
 				for x=1,buffer.width do
 					buffer.contents[y][x] = frames[sFrame][selectrect.y1 + y - 1][selectrect.x1 + x - 1]
 					if removeImage then frames[fra][selectrect.y1 + y - 1][selectrect.x1 + x - 1] = nil end
 					if buffer.contents[y][x] then containsSomething = true end
 				end
 			end
 		end
 	end
 	--I don't classify an empty buffer as a real buffer- confusing to the user.
 	if not containsSomething then buffer = nil end
 end
 
 --[[Replaces all pixels under the selection rectangle with the image buffer (or what can be seen of it). Record-dependent.
 	Params: removeBuffer:bool = true if the buffer is to be emptied after copying, false otherwise
 	Returns:nil
 ]]--
 local function copyFromBuffer(removeBuffer)
 	if not buffer then return end
 
 	for y = 1, math.min(buffer.height,selectrect.y2-selectrect.y1+1) do
 		local f,l = sFrame, sFrame
 		if record then f,l = 1, framecount end
 
 		for fra = f,l do
 			if not frames[fra][selectrect.y1+y-1] then frames[fra][selectrect.y1+y-1] = { } end
 			for x = 1, math.min(buffer.width,selectrect.x2-selectrect.x1+1) do
 				frames[fra][selectrect.y1+y-1][selectrect.x1+x-1] = buffer.contents[y][x]
 			end
 		end
 	end
 
 	if removeBuffer then buffer = nil end
 end
 
 --[[Moves the entire image (or entire animation) to the specified coordinates. Record-dependent.
 	Params: newx:int = the X coordinate to move the image to
 			newy:int = the Y coordinate to move the image to
 	Returns:nil
 ]]--
 local function moveImage(newx,newy)
 	if not leflim or not toplim then return end
 	if newx <=0 or newy <=0 then return end
 	local f,l = sFrame,sFrame
 	if record then f,l = 1,framecount end
 
 	for i=f,l do
 		local newlines = { }
 		for y,line in pairs(frames[i]) do
 			newlines[y-toplim+newy] = { }
 			for x,char in pairs(line) do
 				newlines[y-toplim+newy][x-leflim+newx] = char
 			end
 		end
 		frames[i] = newlines
 	end
 end
 
 --[[Prompts the user to clear the current frame or all frames. Record-dependent.,
 	Params: none
 	Returns:nil
 ]]--
 local function clearImage()
 	inMenu = true
 	if not animated then
 		drawMessage("Clear image? Y/N: ")
 	elseif record then
 		drawMessage("Clear ALL frames? Y/N: ")
 	else
 		drawMessage("Clear current frame? Y/N :")
 	end
 	if string.find(string.upper(readInput(1)), "Y") then
 		local f,l = sFrame,sFrame
 		if record then f,l = 1,framecount end
 
 		for i=f,l do
 			frames[i] = { }
 		end
 	end
 	inMenu = false
 end
 
 --[[A recursively called method (watch out for big calls!) in which every pixel of a set colour is
 	changed to another colour. Does not work on the nil colour, for obvious reasons.
 	Params: x:int = The X coordinate of the colour to flood-fill
 			y:int = The Y coordinate of the colour to flood-fill
 			targetColour:colour = the colour that is being flood-filled
 			newColour:colour = the colour with which to replace the target colour
 	Returns:nil
 ]]--
 local function floodFill(x, y, targetColour, newColour)
 	if not newColour or not targetColour then return end
 	local nodeList = { }
 
 	table.insert(nodeList, {x = x, y = y})
 
 	while #nodeList > 0 do
 		local node = nodeList[1]
 		if frames[sFrame][node.y] and frames[sFrame][node.y][node.x] == targetColour then
 			frames[sFrame][node.y][node.x] = newColour
 			table.insert(nodeList, { x = node.x + 1, y = node.y})
 			table.insert(nodeList, { x = node.x, y = node.y + 1})
 			if x > 1 then table.insert(nodeList, { x = node.x - 1, y = node.y}) end
 			if y > 1 then table.insert(nodeList, { x = node.x, y = node.y - 1}) end
 		end
 		table.remove(nodeList, 1)
 	end
 end
 
 --[[
 			Section: Animation Tools
 ]]--
 
 --[[Enters play mode, allowing the animation to play through. Interface is restricted to allow this,
 	and method only leaves once the player leaves play mode.
 	Params: none
 	Returns:nil
 ]]--
 local function playAnimation()
 	state = "play"
 	selectedrect = nil
 
 	local animt = os.startTimer(animtime)
 	repeat
 		drawCanvas()
 		drawInterface()
 
 		local id,key,_,y = os.pullEvent()
 
 		if id=="timer" then
 			if key == animt then
 				animt = os.startTimer(animtime)
 				sFrame = (sFrame % framecount) + 1
 			else
 				updateTimer(key)
 			end
 		elseif id=="key" then
 			if key == keys.comma and animtime > 0.1 then animtime = animtime - 0.05
 			elseif key == keys.period and animtime < 0.5 then animtime = animtime + 0.05
 			elseif key == keys.space then state = "paint" end
 		elseif id=="mouse_click" and y == h then
 			state = "paint"
 		end
 	until state ~= "play"
 	os.startTimer(0.5)
 end
 
 --[[Changes the selected frame (sFrame) to the chosen frame. If this frame is above the framecount,
 	additional frames are created with a copy of the image on the selected frame.
 	Params: newframe:int = the new frame to move to
 	Returns:nil
 ]]--
 local function changeFrame(newframe)
 	inMenu = true
 	if not tonumber(newframe) then
 		term.setCursorPos(1,h)
 		term.setBackgroundColour(colours.lightGrey)
 		term.setTextColour(colours.grey)
 		term.clearLine()
 
 		term.write("Go to frame: ")
 		newframe = tonumber(readInput(2))
 		if not newframe or newframe <= 0 then
 			inMenu = false
 			return
 		end
 	elseif newframe <= 0 then return end
 
 	if newframe > framecount then
 		for i=framecount+1,newframe do
 			frames[i] = {}
 			for y,line in pairs(frames[sFrame]) do
 				frames[i][y] = { }
 				for x,v in pairs(line) do
 					frames[i][y][x] = v
 				end
 			end
 		end
 		framecount = newframe
 	end
 	sFrame = newframe
 	inMenu = false
 end
 
 --[[Removes every frame leading after the frame passed in
 	Params: frame:int the non-inclusive lower bounds of the delete
 	Returns:nil
 ]]--
 local function removeFramesAfter(frame)
 	inMenu = true
 	if frame==framecount then return end
 	drawMessage("Remove frames "..(frame+1).."/"..framecount.."? Y/N :")
 	local answer = string.upper(readInput(1))
 
 	if string.find(answer, string.upper("Y")) ~= 1 then
 		inMenu = false
 		return
 	end
 
 	for i=frame+1, framecount do
 		frames[i] = nil
 	end
 	framecount = frame
 	inMenu = false
 end
 
 --[[
 			Section: Printing Tools
 ]]--
 
 --[[Constructs a new facing to the left of the current facing
 	Params: curx:number = The facing on the X axis
 			curz:number = The facing on the Z axis
 			hand:string = The hand of the axis ("right" or "left")
 	Returns:number,number = the new facing on the X and Z axis after a left turn
 ]]--
 local function getLeft(curx, curz)
 	local hand = "left"
 	if layering == "up" then hand = "right" end
 
 	if hand == "right" then
 		if curx == 1 then return 0,-1 end
 		if curx == -1 then return 0,1 end
 		if curz == 1 then return 1,0 end
 		if curz == -1 then return -1,0 end
 	else
 		if curx == 1 then return 0,1 end
 		if curx == -1 then return 0,-1 end
 		if curz == 1 then return -1,0 end
 		if curz == -1 then return 1,0 end
 	end
 end
 
 --[[Constructs a new facing to the right of the current facing
 	Params: curx:number = The facing on the X axis
 			curz:number = The facing on the Z axis
 			hand:string = The hand of the axis ("right" or "left")
 	Returns:number,number = the new facing on the X and Z axis after a right turn
 ]]--
 local function getRight(curx, curz)
 	local hand = "left"
 	if layering == "up" then hand = "right" end
 
 	if hand == "right" then
 		if curx == 1 then return 0,1 end
 		if curx == -1 then return 0,-1 end
 		if curz == 1 then return -1,0 end
 		if curz == -1 then return 1,0 end
 	else
 		if curx == 1 then return 0,-1 end
 		if curx == -1 then return 0,1 end
 		if curz == 1 then return 1,0 end
 		if curz == -1 then return -1,0 end
 	end
 end
 
 
 --[[Sends out a rednet signal requesting local printers, and will listen for any responses. Printers found are added to the
 	printerList (for ID's) and printerNames (for names)
 	Params: nil
 	Returns:nil
 ]]--
 local function locatePrinters()
 	printerList = { }
 	printerNames = { name = "Printers" }
 	local oldState = state
 	state = "Locating printers, please wait...   "
 	drawCanvas()
 	drawInterface()
 	state = oldState
 
 	local modemOpened = false
 	for k,v in pairs(rs.getSides()) do
 		if peripheral.isPresent(v) and peripheral.getType(v) == "modem" then
 			rednet.open(v)
 			modemOpened = true
 			break
 		end
 	end
 
 	if not modemOpened then
 		displayConfirmDialogue("Modem not found!", "No modem peripheral. Must have network modem to locate printers.")
 		return false
 	end
 
 	rednet.broadcast("$3DPRINT IDENTIFY")
 
 	while true do
 		local id, msg = rsTimeReceive(1)
 
 		if not id then break end
 		if string.find(msg, "$3DPRINT IDACK") == 1 then
 			msg = string.gsub(msg, "$3DPRINT IDACK ", "")
 			table.insert(printerList, id)
 			table.insert(printerNames, msg)
 		end
 	end
 
 	if #printerList == 0 then
 		displayConfirmDialogue("Printers not found!", "No active printers found in proximity of this computer.")
 		return false
 	else
 		return true
 	end
 end
 
 --[[Sends a request to the printer. Waits on a response and updates the state of the application accordingly.
 	Params: command:string the command to send
 			param:string a parameter to send, if any
 	Returns:nil
 ]]--
 local function sendPC(command,param)
 	local msg = "$PC "..command
 	if param then msg = msg.." "..param end
 	rednet.send(printerList[selectedPrinter], msg)
 
 	while true do
 		local id,key = rsTimeReceive()
 		if id == printerList[selectedPrinter] then
 			if key == "$3DPRINT ACK" then
 				break
 			elseif key == "$3DPRINT DEP" then
 				displayConfirmDialogue("Printer Empty", "The printer has exhasted a material. Please refill slot "..param..
 					", and click this message when ready to continue.")
 				rednet.send(printerList[selectedPrinter], msg)
 			elseif key == "$3DPRINT OOF" then
 				displayConfirmDialogue("Printer Out of Fuel", "The printer has no fuel. Please replace the material "..
 					"in slot 1 with a fuel source, then click this message.")
 				rednet.send(printerList[selectedPrinter], "$PC SS 1")
 				id,key = rsTimeReceive()
 				rednet.send(printerList[selectedPrinter], "$PC RF")
 				id,key = rsTimeReceive()
 				rednet.send(printerList[selectedPrinter], msg)
 			end
 		end
 	end
 
 	--Changes to position are handled after the event has been successfully completed
 	if command == "FW" then
 		px = px + pfx
 		pz = pz + pfz
 	elseif command == "BK" then
 		px = px - pfx
 		pz = pz - pfz
 	elseif command == "UP" then
 		if layering == "up" then
 			py = py + 1
 		else
 			py = py - 1
 		end
 	elseif command == "DW" then
 		if layering == "up" then
 			py = py - 1
 		else
 			py = py + 1
 		end
 	elseif command == "TL" then
 		pfx,pfz = getLeft(pfx,pfz)
 	elseif command == "TR" then
 		pfx,pfz = getRight(pfx,pfz)
 	elseif command == "TU" then
 		pfx = -pfx
 		pfz = -pfz
 	end
 
 	drawCanvas()
 	drawInterface()
 end
 
 --[[A printing function that commands the printer to turn to face the desired direction, if it is not already doing so
 	Params: desx:number = the normalized x direction to face
 			desz:number = the normalized z direction to face
 	Returns:nil
 ]]--
 local function turnToFace(desx,desz)
 	if desx ~= 0 then
 		if pfx ~= desx then
 			local temppfx,_ = getLeft(pfx,pfz)
 			if temppfx == desx then
 				sendPC("TL")
 			elseif temppfx == -desx then
 				sendPC("TR")
 			else
 				sendPC("TU")
 			end
 		end
 	else
 		print("on the z axis")
 		if pfz ~= desz then
 			local _,temppfz = getLeft(pfx,pfz)
 			if temppfz == desz then
 				sendPC("TL")
 			elseif temppfz == -desz then
 				sendPC("TR")
 			else
 				sendPC("TU")
 			end
 		end
 	end
 end
 
 --[[Performs the print
 	Params: nil
 	Returns:nil
 ]]--
 local function performPrint()
 	state = "active print"
 	if layering == "up" then
 		--An up layering starts our builder bot on the bottom left corner of our build
 		px,py,pz = leflim, 0, botlim + 1
 		pfx,pfz = 0,-1
 
 		--We move him forward and up a bit from his original position.
 		sendPC("FW")
 		sendPC("UP")
 		--For each layer that needs to be completed, we go up by one each time
 		for layers=1,#frames do
 			--We first decide if we're going forwards or back, depending on what side we're on
 			local rowbot,rowtop,rowinc = nil,nil,nil
 			if pz == botlim then
 				rowbot,rowtop,rowinc = botlim,toplim,-1
 			else
 				rowbot,rowtop,rowinc = toplim,botlim,1
 			end
 
 			for rows = rowbot,rowtop,rowinc do
 				--Then we decide if we're going left or right, depending on what side we're on
 				local linebot,linetop,lineinc = nil,nil,nil
 				if px == leflim then
 					--Facing from the left side has to be easterly- it's changed here
 					turnToFace(1,0)
 					linebot,linetop,lineinc = leflim,riglim,1
 				else
 					--Facing from the right side has to be westerly- it's changed here
 					turnToFace(-1,0)
 					linebot,linetop,lineinc = riglim,leflim,-1
 				end
 
 				for lines = linebot,linetop,lineinc do
 					--We move our turtle forward, placing the right material at each step
 					local material = frames[py][pz][px]
 					if material then
 						material = math.log10(frames[py][pz][px])/math.log10(2) + 1
 						sendPC("SS", material)
 						sendPC("PD")
 					end
 					if lines ~= linetop then
 						sendPC("FW")
 					end
 				end
 
 				--The printer then has to do a U-turn, depending on which way he's facing and
 				--which way he needs to go
 				local temppfx,temppfz = getLeft(pfx,pfz)
 				if temppfz == rowinc and rows ~= rowtop then
 					sendPC("TL")
 					sendPC("FW")
 					sendPC("TL")
 				elseif temppfz == -rowinc and rows ~= rowtop then
 					sendPC("TR")
 					sendPC("FW")
 					sendPC("TR")
 				end
 			end
 			--Now at the end of a run he does a 180 and moves up to begin the next part of the print
 			sendPC("TU")
 			if layers ~= #frames then
 				sendPC("UP")
 			end
 		end
 		--All done- now we head back to where we started.
 		if px ~= leflim then
 			turnToFace(-1,0)
 			while px ~= leflim do
 				sendPC("FW")
 			end
 		end
 		if pz ~= botlim then
 			turnToFace(0,-1)
 			while pz ~= botlim do
 				sendPC("BK")
 			end
 		end
 		turnToFace(0,-1)
 		sendPC("BK")
 		while py > 0 do
 			sendPC("DW")
 		end
 	else
 		--The front facing is at the top-left corner, facing south not north
 		px,py,pz = leflim, botlim, 1
 		pfx,pfz = 0,1
 		--We move the printer to the last layer- he prints from the back forwards
 		while pz < #frames do
 			sendPC("FW")
 		end
 
 		--For each layer in the frame we build our wall, the move back
 		for layers = 1,#frames do
 			--We first decide if we're going left or right based on our position
 			local rowbot,rowtop,rowinc = nil,nil,nil
 			if px == leflim then
 				rowbot,rowtop,rowinc = leflim,riglim,1
 			else
 				rowbot,rowtop,rowinc = riglim,leflim,-1
 			end
 
 			for rows = rowbot,rowtop,rowinc do
 				--Then we decide if we're going up or down, depending on our given altitude
 				local linebot,linetop,lineinc = nil,nil,nil
 				if py == botlim then
 					linebot,linetop,lineinc = botlim,toplim,-1
 				else
 					linebot,linetop,lineinc = toplim,botlim,1
 				end
 
 				for lines = linebot,linetop,lineinc do
 				--We move our turtle up/down, placing the right material at each step
 					local material = frames[pz][py][px]
 					if material then
 						material = math.log10(frames[pz][py][px])/math.log10(2) + 1
 						sendPC("SS", material)
 						sendPC("PF")
 					end
 					if lines ~= linetop then
 						if lineinc == 1 then sendPC("DW")
 						else sendPC("UP") end
 					end
 				end
 
 				if rows ~= rowtop then
 					turnToFace(rowinc,0)
 					sendPC("FW")
 					turnToFace(0,1)
 				end
 			end
 
 			if layers ~= #frames then
 				sendPC("TU")
 				sendPC("FW")
 				sendPC("TU")
 			end
 		end
 		--He's easy to reset
 		while px ~= leflim do
 			turnToFace(-1,0)
 			sendPC("FW")
 		end
 		turnToFace(0,1)
 	end
 
 	sendPC("DE")
 
 	displayConfirmDialogue("Print complete", "The 3D print was successful.")
 end
 
 --[[
 			Section: Interface
 ]]--
 
 --[[Runs the printing interface. Allows users to find/select a printer, the style of printing to perform and to begin the operation
 	Params: none
 	Returns:boolean true if printing was started, false otherwse
 ]]--
 local function runPrintInterface()
 	calculateMaterials()
 	--There's nothing on canvas yet!
 	if not botlim then
 		displayConfirmDialogue("Cannot Print Empty Canvas", "There is nothing on canvas that "..
 				"can be printed, and the operation cannot be completed.")
 		return false
 	end
 	--No printers nearby
 	if not locatePrinters() then
 		return false
 	end
 
 	layering = "up"
 	requirementsDisplayed = false
 	selectedPrinter = 1
 	while true do
 		drawCanvas()
 		term.setBackgroundColour(colours.lightGrey)
 		for i=1,10 do
 			term.setCursorPos(1,i)
 			term.clearLine()
 		end
 		drawInterface()
 		term.setBackgroundColour(colours.lightGrey)
 		term.setTextColour(colours.black)
 
 		local msg = "3D Printing"
 		term.setCursorPos(w/2-#msg/2 - 2, 1)
 		term.write(msg)
 		term.setBackgroundColour(colours.grey)
 		term.setTextColour(colours.lightGrey)
 		if(requirementsDisplayed) then
 			msg = "Count:"
 		else
 			msg = " Slot:"
 		end
 		term.setCursorPos(w-3-#msg, 1)
 		term.write(msg)
 		term.setBackgroundColour(colours.lightGrey)
 		term.setTextColour(colours.black)
 
 		term.setCursorPos(7, 2)
 		term.write("Layering")
 		drawPictureTable(layerUpIcon, 3, 3, colours.white)
 		drawPictureTable(layerForwardIcon, 12, 3, colours.white)
 		if layering == "up" then
 			term.setBackgroundColour(colours.red)
 		else
 			term.setBackgroundColour(colours.lightGrey)
 		end
 		term.setCursorPos(3, 9)
 		term.write("Upwards")
 		if layering == "forward" then
 			term.setBackgroundColour(colours.red)
 		else
 			term.setBackgroundColour(colours.lightGrey)
 		end
 		term.setCursorPos(12, 9)
 		term.write("Forward")
 
 		term.setBackgroundColour(colours.lightGrey)
 		term.setTextColour(colours.black)
 		term.setCursorPos(31, 2)
 		term.write("Printer ID")
 		term.setCursorPos(33, 3)
 		if #printerList > 1 then
 			term.setBackgroundColour(colours.grey)
 			term.setTextColour(colours.lightGrey)
 		else
 			term.setTextColour(colours.red)
 		end
 		term.write(" "..printerNames[selectedPrinter].." ")
 
 		term.setBackgroundColour(colours.grey)
 		term.setTextColour(colours.lightGrey)
 		term.setCursorPos(25, 10)
 		term.write(" Cancel ")
 		term.setCursorPos(40, 10)
 		term.write(" Print ")
 
 		local id, p1, p2, p3 = os.pullEvent()
 
 		if id == "timer" then
 			updateTimer(p1)
 		elseif id == "mouse_click" then
 			--Layering Buttons
 			if p2 >= 3 and p2 <= 9 and p3 >= 3 and p3 <= 9 then
 				layering = "up"
 			elseif p2 >= 12 and p2 <= 18 and p3 >= 3 and p3 <= 9 then
 				layering = "forward"
 			--Count/Slot
 			elseif p2 >= w - #msg - 3 and p2 <= w - 3 and p3 == 1 then
 				requirementsDisplayed = not requirementsDisplayed
 			--Printer ID
 			elseif p2 >= 33 and p2 <= 33 + #printerNames[selectedPrinter] and p3 == 3 and #printerList > 1 then
 				local chosenName = displayDropDown(33, 3, printerNames)
 				for i=1,#printerNames do
 					if printerNames[i] == chosenName then
 						selectedPrinter = i
 						break;
 					end
 				end
 			--Print and Cancel
 			elseif p2 >= 25 and p2 <= 32 and p3 == 10 then
 				break
 			elseif p2 >= 40 and p2 <= 46 and p3 == 10 then
 				rednet.send(printerList[selectedPrinter], "$3DPRINT ACTIVATE")
 				ready = false
 				while true do
 					local id,msg = rsTimeReceive(10)
 
 					if id == printerList[selectedPrinter] and msg == "$3DPRINT ACTACK" then
 						ready = true
 						break
 					end
 				end
 				if ready then
 					performPrint()
 					break
 				else
 					displayConfirmDialogue("Printer Didn't Respond", "The printer didn't respond to the activation command. Check to see if it's online")
 				end
 			end
 		end
 	end
 	state = "paint"
 end
 
 --[[This function changes the current paint program to another tool or mode, depending on user input. Handles
 	any necessary changes in logic involved in that.
 	Params: mode:string = the name of the mode to change to
 	Returns:nil
 ]]--
 local function performSelection(mode)
 	if not mode or mode == "" then return
 
 	elseif mode == "help" then
 		drawHelpScreen()
 
 	elseif mode == "blueprint on" then
 		blueprint = true
 		ddModes[2][3] = "blueprint off"
 
 	elseif mode == "blueprint off" then
 		blueprint = false
 		ddModes[2][3] = "blueprint on"
 
 	elseif mode == "layers on" then
 		layerDisplay = true
 		ddModes[2][4] = "layers off"
 
 	elseif mode == "layers off" then
 		layerDisplay = false
 		ddModes[2][4] = "layers on"
 
 	elseif mode == "direction on" then
 		printDirection = true
 		ddModes[2][5] = "direction off"
 
 	elseif mode == "direction off" then
 		printDirection = false
 		ddModes[2][5] = "direction on"
 
 	elseif mode == "go to" then
 		changeFrame()
 
 	elseif mode == "remove" then
 		removeFramesAfter(sFrame)
 
 	elseif mode == "play" then
 		playAnimation()
 
 	elseif mode == "copy" then
 		if selectrect and selectrect.x1 ~= selectrect.x2 then
 			copyToBuffer(false)
 		end
 
 	elseif mode == "cut" then
 		if selectrect and selectrect.x1 ~= selectrect.x2 then
 			copyToBuffer(true)
 		end
 
 	elseif mode == "paste" then
 		if selectrect and selectrect.x1 ~= selectrect.x2 then
 			copyFromBuffer(false)
 		end
 
 	elseif mode == "hide" then
 		selectrect = nil
 		if state == "select" then state = "corner select" end
 
 	elseif mode == "alpha to left" then
 		if lSel then alphaC = lSel end
 
 	elseif mode == "alpha to right" then
 		if rSel then alphaC = rSel end
 
 	elseif mode == "record" then
 		record = not record
 
 	elseif mode == "clear" then
 		if state=="select" then buffer = nil
 		else clearImage() end
 
 	elseif mode == "select" then
 		if state=="corner select" or state=="select" then
 			state = "paint"
 		elseif selectrect and selectrect.x1 ~= selectrect.x2 then
 			state = "select"
 		else
 			state = "corner select"
 		end
 
 	elseif mode == "print" then
 		state = "print"
 		runPrintInterface()
 		state = "paint"
 
 	elseif mode == "save" then
 		if animated then saveNFA(sPath)
 		else saveNFP(sPath) end
 
 	elseif mode == "exit" then
 		isRunning = false
 
 	elseif mode ~= state then state = mode
 	else state = "paint"
 	end
 end
 
 --[[The main function of the program, reads and handles all events and updates them accordingly. Mode changes,
 	painting to the canvas and general selections are done here.
 	Params: none
 	Returns:nil
 ]]--
 local function handleEvents()
 	recttimer = os.startTimer(0.5)
 	while isRunning do
 		drawCanvas()
 		drawInterface()
 		local id,p1,p2,p3 = os.pullEvent()
 		if id=="timer" then
 			updateTimer(p1)
 		elseif id=="mouse_click" or id=="mouse_drag" then
 			if p2 >=w-1 and p3 < #column+1 then
 				if p1==1 then lSel = column[p3]
 				else rSel = column[p3] end
 			elseif p2 >=w-1 and p3==#column+1 then
 				if p1==1 then lSel = nil
 				else rSel = nil end
 			elseif p2==w-1 and p3==h and animated then
 				changeFrame(sFrame-1)
 			elseif p2==w and p3==h and animated then
 				changeFrame(sFrame+1)
 			elseif p2 < w-10 and p3==h then
 				local sel = displayDropDown(1, h-1, ddModes)
 				performSelection(sel)
 			elseif p2 < w-1 and p3 <= h-1 then
 				if state=="pippette" then
 					if p1==1 then
 						if frames[sFrame][p3+sy] and frames[sFrame][p3+sy][p2+sx] then
 							lSel = frames[sFrame][p3+sy][p2+sx]
 						end
 					elseif p1==2 then
 						if frames[sFrame][p3+sy] and frames[sFrame][p3+sy][p2+sx] then
 							rSel = frames[sFrame][p3+sy][p2+sx]
 						end
 					end
 				elseif state=="move" then
 					updateImageLims(record)
 					moveImage(p2,p3)
 				elseif state=="flood" then
 					if p1 == 1 and lSel and frames[sFrame][p3+sy]  then
 						floodFill(p2,p3,frames[sFrame][p3+sy][p2+sx],lSel)
 					elseif p1 == 2 and rSel and frames[sFrame][p3+sy] then
 						floodFill(p2,p3,frames[sFrame][p3+sy][p2+sx],rSel)
 					end
 				elseif state=="corner select" then
 					if not selectrect then
 						selectrect = { x1=p2+sx, x2=p2+sx, y1=p3+sy, y2=p3+sy }
 					elseif selectrect.x1 ~= p2+sx and selectrect.y1 ~= p3+sy then
 						if p2+sx<selectrect.x1 then selectrect.x1 = p2+sx
 						else selectrect.x2 = p2+sx end
 
 						if p3+sy<selectrect.y1 then selectrect.y1 = p3+sy
 						else selectrect.y2 = p3+sy end
 
 						state = "select"
 					end
 				elseif state=="select" then
 					if p1 == 1 then
 						local swidth = selectrect.x2 - selectrect.x1
 						local sheight = selectrect.y2 - selectrect.y1
 
 						selectrect.x1 = p2 + sx
 						selectrect.y1 = p3 + sy
 						selectrect.x2 = p2 + swidth + sx
 						selectrect.y2 = p3 + sheight + sy
 					elseif p1 == 2 and p2 < w-2 and p3 < h-1 then
 						inMenu = true
 						local sel = displayDropDown(p2, p3, srModes)
 						inMenu = false
 						performSelection(sel)
 					end
 				else
 					local f,l = sFrame,sFrame
 					if record then f,l = 1,framecount end
 					local bwidth = 0
 					if state == "brush" then bwidth = brushsize-1 end
 
 					for i=f,l do
 						for x = math.max(1,p2+sx-bwidth),p2+sx+bwidth do
 							for y = math.max(1,p3+sy-bwidth), p3+sy+bwidth do
 								if math.abs(x - (p2+sx)) + math.abs(y - (p3+sy)) <= bwidth then
 									if not frames[i][y] then frames[i][y] = {} end
 									if p1==1 then frames[i][y][x] = lSel
 									else frames[i][y][x] = rSel end
 								end
 							end
 						end
 					end
 				end
 			end
 		elseif id=="key" then
 			if p1==keys.leftCtrl then
 				local sel = displayDropDown(1, h-1, ddModes[#ddModes])
 				performSelection(sel)
 			elseif p1==keys.leftAlt then
 				local sel = displayDropDown(1, h-1, ddModes[1])
 				performSelection(sel)
 			elseif p1==keys.h then
 				performSelection("help")
 			elseif p1==keys.x then
 				performSelection("cut")
 			elseif p1==keys.c then
 				performSelection("copy")
 			elseif p1==keys.v then
 				performSelection("paste")
 			elseif p1==keys.z then
 				performSelection("clear")
 			elseif p1==keys.s then
 				performSelection("select")
 			elseif p1==keys.tab then
 				performSelection("hide")
 			elseif p1==keys.q then
 				performSelection("alpha to left")
 			elseif p1==keys.w then
 				performSelection("alpha to right")
 			elseif p1==keys.f then
 				performSelection("flood")
 			elseif p1==keys.b then
 				performSelection("brush")
 			elseif p1==keys.m then
 				performSelection("move")
 			elseif p1==keys.backslash and animated then
 				performSelection("record")
 			elseif p1==keys.p then
 				performSelection("pippette")
 			elseif p1==keys.g and animated then
 				performSelection("go to")
 			elseif p1==keys.period and animated then
 				changeFrame(sFrame+1)
 			elseif p1==keys.comma and animated then
 				changeFrame(sFrame-1)
 			elseif p1==keys.r and animated then
 				performSelection("remove")
 			elseif p1==keys.space and animated then
 				performSelection("play")
 			elseif p1==keys.left then
 				if state == "move" then
 					updateImageLims(record)
 					moveImage(leflim-1,toplim)
 				elseif state=="select" and selectrect.x1 > 1 then
 					selectrect.x1 = selectrect.x1-1
 					selectrect.x2 = selectrect.x2-1
-			elseif tonumber(p1) > 0 then
+
 			elseif p1==keys.right then
 				if state == "move" then
 					updateImageLims(record)
 					moveImage(leflim+1,toplim)
 				elseif state=="select" then
 					selectrect.x1 = selectrect.x1+1
 					selectrect.x2 = selectrect.x2+1
 				else sx=sx+1 end
 			elseif p1==keys.up then
 				if state == "move" then
 					updateImageLims(record)
 					moveImage(leflim,toplim-1)
 				elseif state=="select" and selectrect.y1 > 1 then
 					selectrect.y1 = selectrect.y1-1
 					selectrect.y2 = selectrect.y2-1
 				elseif sy > 0 then sy=sy-1 end
 			elseif p1==keys.down then
 				if state == "move" then
 					updateImageLims(record)
 					moveImage(leflim,toplim+1)
 				elseif state=="select" then
 					selectrect.y1 = selectrect.y1+1
 					selectrect.y2 = selectrect.y2+1
 				else sy=sy+1 end
 			end
 		elseif id=="char" and tonumber(p1) then
 			if state=="brush" and tonumber(p1) > 1 then
 				brushsize = tonumber(p1)
 			elseif animated and tonumber(p1) > 0 then
 				changeFrame(tonumber(p1))
 			end
 		end
 	end
 end
 
 --[[
 			Section: Main
 ]]--
 
 --Taken almost directly from edit (for consistency)
 local tArgs = {...}
 
 local ca = 1
 
 if tArgs[ca] == "-a" then
 	animated = true
 	ca = ca + 1
 end
 
 if #tArgs < ca then
 	print("Usage: npaintpro [-a] <path>")
 	return
 end
 
 sPath = shell.resolve(tArgs[ca])
 local bReadOnly = fs.isReadOnly(sPath)
 if fs.exists(sPath) then
 	if fs.isDir(sPath) then
 		print("Cannot edit a directory.")
 		return
 	elseif string.find(sPath, ".nfp") ~= #sPath-3 and string.find(sPath, ".nfa") ~= #sPath-3 then
 		print("Can only edit .nfp and nfa files:",string.find(sPath, ".nfp"),#sPath-3)
 		return
 	end
 
 	if string.find(sPath, ".nfa") == #sPath-3 then
 		animated = true
 	end
 
 	if string.find(sPath, ".nfp") == #sPath-3 and animated then
 		print("Convert to nfa? Y/N")
 		if string.find(string.lower(io.read()), "y") then
 			local nsPath = string.sub(sPath, 1, #sPath-1).."a"
 			fs.move(sPath, nsPath)
 			sPath = nsPath
 		else
 			animated = false
 		end
 	end
 else
 	if not animated and string.find(sPath, ".nfp") ~= #sPath-3 then
 		sPath = sPath..".nfp"
 	elseif animated and string.find(sPath, ".nfa") ~= #sPath-3 then
 		sPath = sPath..".nfa"
 	end
 end
 
 if not term.isColour() then
 	print("For colour computers only")
 	return
 end
 
 drawLogo()
 init()
 handleEvents()
 
 term.setBackgroundColour(colours.black)
 shell.run("clear")