Sketch-it paint program

--this is the sketch-it program
--copyright of BlueTide Programs.inc, Benedict Allen, all members of BlueTide Programs.inc and all members of programcraft.inc
--if you wish to use this program please contact Benedict Allen(awsumben13 on cc forums) and make sure you give the credit to BlueTide Programs
--usability functions
local function clear(x,y)
if x == nil or y == nil then
  term.clear()
  term.setCursorPos(1,1)
else
  term.clear()
  term.setCursorPos(x,y)
end
end
function writePos(x,y,text)
term.setCursorPos(x,y)
term.write(text)
end
function clearPrint(x,y,text)
term.clear()
term.setCursorPos(x,y)
term.write(text)
end
function reset(file, x, y)
if fs.exists(file) then
  h = fs.open(file, "w")
  h.write("")
  h.close()
  term.setCursorPos(x,y)
  term.write("File reset")
  sleep(2)
else
  term.setCursorPos(x,y)
  term.write("file not found")
  sleep(2)
end
end
function tip(help)
while true do
  clear()
  print(help)
  writePos(1,17,"press enter to exit")
  event, key = os.pullEvent()
  if key == 28 then break
  end
end
end
function drawBox(x,y,z,n)
for k = 1,n-y do
  for i = 1,z-x do
   writePos(x+i,y+k," ")
  end
end
writePos(x,y,"+")
term.setCursorPos(x+1,y)
for i = 1,(z-x)-1 do
  write("-")
end
writePos(z,y,"+")
term.setCursorPos(x+1,n)
for i = 1,(z-x)-1 do
  write("-")
end
for i = 1,(n-y)-1 do
  writePos(x,y+i,"|")
end
for i = 1,(n-y)-1 do
  writePos(z,y+i,"|")
end
writePos(x,n,"+")
writePos(z,n,"+")
end
function saveBox(type)
if type == nil then
  add("+", cursorPosX, boxY)
  for i = 1,((cursorPosX+1)-boxX)-2 do
   add("-", boxX+i, boxY)
  end
  add("+", boxX, boxY)
  add("+", cursorPosX, cursorPosY)
  for i = 1,((cursorPosX+1)-boxX)-2 do
   add("-", boxX+i, cursorPosY)
  end
  add("+",boxX, cursorPosY)
  for i = 1,((cursorPosY+1)-boxY)-2 do
   add("|", boxX, boxY+i)
  end
  for i = 1,((cursorPosY+1)-boxY)-2 do
   add("|", cursorPosX, boxY+i)
  end
else
  for i = boxX, cursorPosX do
   for k = boxY, cursorPosY do
	add(type, i, k)
   end
  end
end
end
function split(str, pat)
   local t = {}
   local fpat = "(.-)" .. pat
   local last_end = 1
   local s, e, cap = str:find(fpat, 1)
   while s do
	  if s ~= 1 or cap ~= "" then
  table.insert(t,cap)
	  end
	  last_end = e+1
	  s, e, cap = str:find(fpat, last_end)
   end
   if last_end <= #str then
	  cap = str:sub(last_end)
	  table.insert(t, cap)
   end
   return t
end
function animation(limit, item, time, x, y)
yer = 0
if x == nil or y == nil then
  x, y = term.getCursorPos()
end
while true do
  if yer > limit then
   yer = 0
  end
  writePos(x, y+yer, item)
  sleep(time)
  yer = yer+1
end
end
--end
--programs functions
function askToSave()
while true do
  drawBox(14,8,44,11)
  writePos(16,9,"Do you want to save first?")
  writePos(17,10,"Yes   No   Cancel")
  if newPos == 1 then
   writePos(16,10,"[")
   writePos(20,10,"]")
  elseif newPos == 2 then
   writePos(22,10,"[")
   writePos(25,10,"]")
  elseif newPos == 3 then
   writePos(27,10,"[")
   writePos(34,10,"]")
  end
  event, key = os.pullEvent()
  if key == 203 and newPos > 1 then
   newPos = newPos-1
  elseif key == 205 and newPos < 3 then
   newPos = newPos+1
  elseif key == 28 then
   if newPos == 1 then
	save()
	xToPrint = {}
	yToPrint = {}
	itemToPrint = {}
	fileOpen = "New File"
	break
   elseif newPos == 2 then
	xToPrint = {}
	yToPrint = {}
	itemToPrint = {}
	fileOpen = "New File"
	break
   elseif newPos == 3 then
	loopBreaker = false
	break
   end
  end
end
end
function open()
if changed == true then
  askToSave()
end
openSel = 1
while true do
  variable = 0
  bottomLimit = topLimit+14
  clear()
  drawBox(1,1,50,18)
  writePos(2,2,"Select the file you want to open:")
  files = fs.list("sketch-it/saves")
  table.insert(files, "Cancel")
  if #files < 15 then
   bottomLimit = #files
  end
  for i = topLimit,bottomLimit do
   variable = variable+1
   writePos(3,2+variable,files[i])
  end
  writePos(2,2+openSel,">")
  event, key = os.pullEvent()
  if key == 200 and openSel > 1 then
   openSel = openSel-1
  elseif key == 208 and openSel < 14 and openSel < #files then
   openSel = openSel+1
  elseif key == 200 and openSel == 1 and topLimit > 1 then
   topLimit = topLimit-1
  elseif key == 208 and openSel == 14 and (bottomLimit <= #files or bottomLimit == 15) then
   topLimit = topLimit+1
  elseif key == 14 then
   break
  elseif key == 28 then
   selectedFile = files[openSel+(topLimit-1)]
   if fs.exists("sketch-it/saves/"..selectedFile.."/xpos") and fs.exists("sketch-it/saves/"..selectedFile.."/ypos") and fs.exists("sketch-it/saves/"..selectedFile.."/item") and selectedFile ~= #files then
	xToPrint = {}
	yToPrint = {}
	itemToPrint = {}
	writePos(2,18,"opening "..selectedFile)
	sleep(1.3)
	file = fs.open("sketch-it/saves/"..selectedFile.."/xpos","r")
	while true do
	 line = file.readLine()
	 table.insert(xToPrint, tonumber(line))
	 if not line then
	  break
	 end
	end
	file = fs.open("sketch-it/saves/"..selectedFile.."/ypos","r")
	while true do
	 line = file.readLine()
	 table.insert(yToPrint, tonumber(line))
	 if not line then
	  break
	 end
	end
	file = fs.open("sketch-it/saves/"..selectedFile.."/item","r")
	while true do
	 line = file.readLine()
	 table.insert(itemToPrint, line)
	 if not line then
	  break
	 end
	end
	fileOpen = selectedFile
	currentField = 2
	break
   elseif openSel == #files then
	break
   else
	drawBox(17,8,33,10)
	writePos(20,9,"broken file")
	sleep(0.7)
   end
  end
end
sketchitWatermark = false
end
function save()
m = 1
secs = (#itemToPrint*3)/20
clear()
drawBox(1,1,50,17)
files = fs.list("sketch-it/saves")
if #files > 14 then
  for i = 1,14 do
   writePos(3,1+i,files[i])
  end
  if #files > 28 then
   for i = 15,28 do
	writePos(25,-13+i,files[i])
   end
  else
   for i = 15,#files do
	writePos(25,-13+i,files[i])
   end
  end
else
  for i = 1,#files do
   writePos(3,1+i,files[i])
  end
end
writePos(1,18,"What do you want to save the file as? ")
input = read()
if not fs.exists(shell.resolve(input)) then
  fs.makeDir("sketch-it/saves/"..input)
end
writePos(1,19,"Saving...this may take a while...")
file = fs.open("sketch-it/saves/"..input.."/xpos","w")
for i = 1,#xToPrint do
  file.writeLine(xToPrint[i])
  sleep(0.001)
  m = m+1
  secs = secs-0.05
  writePos(1,18,"What do you want to save the file as? approx "..secs.." seconds left")
  writePos(35, 19, m.." Out of "..(#itemToPrint*3))
end
file.close()
file = fs.open("sketch-it/saves/"..input.."/ypos","w")
for i = 1,#yToPrint do
  file.writeLine(yToPrint[i])
  sleep(0.001)
  m = m+1
  secs = secs-0.05
  writePos(1,18,"What do you want to save the file as? approx "..secs.." seconds left")
  writePos(35, 19, m.." Out of "..(#itemToPrint*3))
end
file.close()
file = fs.open("sketch-it/saves/"..input.."/item","w")
for i = 1,#itemToPrint do
  file.writeLine(itemToPrint[i])
  sleep(0.001)
  m = m+1
  secs = secs-0.05
  writePos(1,18,"What do you want to save the file as? approx "..secs.." seconds left")
  writePos(35, 19, m.." Out of "..(#itemToPrint*3))
end
file.close()
if input ~= "exit" then
  fileOpen = input
end
changed = false
end
function runFieldOne()
drawScreenOne()
drawScreenTwo()
drawBox(1,3,11,19)
for i = 1,#mopt do
  writePos(3,3+(i*2),mopt[i])
end
writePos(2,3+(f1Selected*2),">")
event, key = os.pullEvent()
if (key == 200 or key == 17)and f1Selected > 1 then
  f1Selected = f1Selected-1
elseif (key == 208 or key == 31)and f1Selected < #mopt then
  f1Selected = f1Selected+1
elseif key == 14 then
  loopBreaker = true
elseif key == 15 then
  currentField = 2
elseif key == 28 then
  if f1Selected == 4 then
   drawMode = 1
  elseif f1Selected == 5 then
   drawMode = 3
  elseif f1Selected == 6 then
   drawMode = 2
  elseif f1Selected == 1 then
   if changed ~= true then
	xToPrint = {}
	yToPrint = {}
	itemToPrint = {}
	fileOpen = "New File"
	sketchitWatermark = false
   else
	askToSave()
   end
  elseif f1Selected == 2 then
   open()
  elseif f1Selected == 3 then
   save()
  end
end
end
function drawScreenOne()
if currentField == 1 then
  clear()
  drawBox(1,1,50,19)
  writePos(1,3,"+------------------------------------------------+")
  drawBox(1,3,11,19)
  writePos(3,2,"Open: "..fileOpen.." - File size: "..#itemToPrint*3)
  for i = 1,#mopt do
   writePos(3,3+(i*2),mopt[i])
  end
  if drawMode == 1 then
   writePos(50-string.len("Tool: pencil")-1, 2, "Tool: pencil")
  elseif drawMode == 2 then
   writePos(50-string.len("Tool: draw box")-1, 2, "Tool: draw box")
  elseif drawMode == 3 then
   writePos(50-string.len("Tool: rubber")-1, 2, "Tool: rubber")
  end
else
  clear()
  drawBox(1,1,50,19)
  writePos(1,3,"+------------------------------------------------+")
  writePos(3,2,"Open: "..fileOpen.." - File size: "..#itemToPrint*3)
  writePos(9,13,"|")
  drawBox(1,3,9,19)
  for i = 1,#mopt do
   writePos(2,3+(i*2),mopt[i])
  end
  writePos(9,15,"|") -- to cover up "draw box"
  if drawMode == 1 then
   writePos(50-string.len("Tool: pencil")-1, 2, "Tool: pencil")
  elseif drawMode == 2 then
   writePos(50-string.len("Tool: draw box")-1, 2, "Tool: draw box")
  elseif drawMode == 3 then
   writePos(50-string.len("Tool: rubber")-1, 2, "Tool: rubber")
  end
end
end
function add(item, x, y)
if x == nil or y == nil then
  x = cursorPosX
  y = cursorPosY
end
for i = 1,#itemToPrint do
  if xToPrint[i] == x and yToPrint[i] == y then
   table.remove(xToPrint, i)
   table.remove(yToPrint, i)
   table.remove(itemToPrint, i)
  end
end
table.insert(xToPrint, x)
table.insert(yToPrint, y)
table.insert(itemToPrint, item)
end
function runFieldTwo()
drawScreenOne()
drawScreenTwo()
if sketchitWatermark == false then
  k = "sketch-it version "..version
  for i = 1,string.len(k) do
   add(string.sub(k,i,i),10+i,18)
  end
  sketchitWatermark = true
end
if drawMode == 3 then
  for i = 1,#itemToPrint do
   if (cursorPosX == xToPrint[i] and cursorPosY == yToPrint[i]) then
	table.remove(xToPrint, i)
	table.remove(yToPrint, i)
	table.remove(itemToPrint, i)
	changed = true
   end
  end
end
if drawing == true and drawMode == 1 then
  add(drawIcon)
  changed = true
end
event, key, item = os.pullEvent()
if key == 200 and cursorPosY > 4 then
  cursorPosY = cursorPosY-1
elseif key == 208 and cursorPosY < 17 then
  cursorPosY = cursorPosY+1
elseif key == 203 and cursorPosX > 10 then
  cursorPosX = cursorPosX-1
elseif key == 205 and cursorPosX < 49 then
  cursorPosX = cursorPosX+1
elseif event == "char" and drawMode == 2 and key ~= " " and boxStarted ~= false then
  saveBox(key)
  boxStarted = false
  changed = true
elseif event == "char" and drawMode == 2 and key == " " and boxStarted ~= false then
  for i = 1,2 do
   for z = boxX, cursorPosX do
	for i = 1,#itemToPrint do
	 for k = boxY, cursorPosY do
	  if k == yToPrint[i] and z == xToPrint[i] then
	   table.remove(xToPrint, i)
	   table.remove(yToPrint, i)
	   table.remove(itemToPrint, i)
	  end
	 end
	end
   end
  end
  boxStarted = false
  changed = true
elseif key == 15 then
  currentField = 1
elseif key == 14 and boxStarted == false then
  loopBreaker = true
  if changed == true then
   askToSave()
  end
elseif key == 42 and drawMode == 1 and drawing == false then
  drawing = true
elseif event == "char" and drawMode == 1 and key ~= " " then
  add(key)
  changed = true
  if cursorPosX < 49 then
   cursorPosX = cursorPosX+1
  end
  drawing = false
elseif key == 57 and drawMode == 1 and cursorPosX < 49 then
  for i = 1,#itemToPrint do
   if cursorPosX == xToPrint[i] and cursorPosY == yToPrint[i] then
	table.remove(xToPrint, i)
	table.remove(yToPrint, i)
	table.remove(itemToPrint, i)
   end
  end
  cursorPosX = cursorPosX+1
elseif key == 42 and drawMode == 1 and drawing == true then
  drawing = false
elseif key == 42 and drawMode == 3 then
  changed = true
  xToPrint = {}
  yToPrint = {}
  itemToPrint = {}
  sketchitWatermark = false
elseif key == 42 and drawMode == 2 and boxStarted ~= true then
  boxStarted = true
  boxX = cursorPosX
  boxY = cursorPosY
elseif key == 42 and drawMode == 2 and boxStarted == true then
  boxStarted = false
  saveBox()
  changed = true
elseif key == 14 and boxStarted == true then
  boxStarted = false
elseif key == 199 then
  cursorPosX = 10
  cursorPosY = 4
elseif key == 29 then
  os.startTimer(0.2)
  event, key = os.pullEvent()
  if key == 200 then
   cursorPosY = 4
  elseif key == 208 then
   cursorPosY = 17
  elseif key == 203 then
   cursorPosX = 10
  elseif key == 205 then
   cursorPosX = 49
  end
end
end
function drawScreenTwo()
drawScreenOne()
if drawMode == 1 then
  writePos(cursorPosX,cursorPosY,"x")
end
for i = 1,#itemToPrint do
  writePos(xToPrint[i],yToPrint[i],itemToPrint[i])
end
if drawMode == 1 then
  writePos(cursorPosX-1,cursorPosY+1,"/|")
  writePos(cursorPosX-2,cursorPosY+2,"//")
  writePos(cursorPosX-3,cursorPosY+3,"//")
  writePos(cursorPosX-4,cursorPosY+4,"</")
elseif drawMode == 2 then
  writePos(cursorPosX,cursorPosY,"X")
elseif drawMode == 3 then
  drawBox(cursorPosX,cursorPosY,cursorPosX+2,cursorPosY+2)
  writePos(cursorPosX,cursorPosY,"O")
end
if boxStarted == true then
  drawBox(boxX,boxY,cursorPosX,cursorPosY)
end
end
--end
--variables
sketchitWatermark = false
drawing = false
boxStarted = false
changed = false
drawMode = 1
fileOpen = "New File"
version = "1.0.2"
mopt = {
"New";
"Open";
"Save";
"Pencil";
"Rubber";
"Draw box";
"More";
}
currentField = 1
f1Selected = 1
loopBreaker = false
cursorPosY = 4
cursorPosX = 15
xToPrint = {}
yToPrint = {}
itemToPrint = {}
drawIcon = "o"
newPos = 1
topLimit = 1
bottomLimit = topLimit+14
openSel = 1
--end
--code
if not fs.exists("sketch-it") then
fs.makeDir("sketch-it")
end
if not fs.exists("sketch-it/saves") then
fs.makeDir("sketch-it/saves")
end
while loopBreaker ~= true do
if currentField == 1 then
  runFieldOne()
else
  runFieldTwo()
end
end
clear()
writePos(1,1,"Thanks for using sketch-it!")
--end