Cursor howto?

I've been trying to create an cursor all night, but I can't get it working and I didn't find any info on internet; except whole API's with shitloads of code and it's kinda hard to find the cursor-only code in there.

Can someone help me with this?

Are you looking for a cursor that moves in the menu to select the option you want to perform?

If so look at the menu tutorial in the tutorial section of the forums.

If you wan't to make a cursor, you need term.setCursorPos() and some variables. Here is a example:

local currentX = 1
local currentY = 1

These will set the cursor position.

function drawCursor()
  term.clear()
  term.setCursorPos(currentX, currentY)
  write(">")
end

This will draw the cursor at the current x/y, now that we got that, we need to call drawCursor() and add controls like this:

while true do
  drawCursor()
  local e,key = os.pullEvent( "key" )
  if key == 17 or key == 200 then --up
	currentY = currentY -1
  elseif key == 31 or key == 208 then --down
	currentY = currentY +1
  elseif key == 203 or key == 30 then --left
	currentX = currentX -1
  elseif key == 205 or key == 32 then --right
	 currentX = currentX +1
  end
end

If you put all this code together like this:

local currentX = 1 --Saves the current X of the cursor
local currentY = 1 --Saves the current Y of the cursor


function drawCursor()
  term.clear() --Clears the screen
  term.setCursorPos(currentX, currentY)  --Draws a cursor at the current X/Y
  write(">")
end


while true do
  drawCursor()
  local e,key = os.pullEvent( "key" )
  if key == 17 or key == 200 then --up
	currentY = currentY -1
  elseif key == 31 or key == 208 then --down
	currentY = currentY +1
  elseif key == 203 or key == 30 then --left
	currentX = currentX -1
  elseif key == 205 or key == 32 then --right
	 currentX = currentX +1
  end
end

It will create a cursor that can move left and right.

If you wan't to make options in a menu like above, remove the left and right and keep up/down and make it so if the cursor is at the same position of the button, make it open the button.

This is how I did it in my WinOS. You can look at that source for more information

@ComputerCraftFan Thanks, but if I put it in my code everything dissapears except the cursor, I tried finding a way around the term.clear()but it didn't work. Also, i'm trying to block the cursor from going outside the selectbox (Y: 7 to Y: 10)

Here's my code so far:

Local Author = "Snakybo inc."
Local Version = "1.0"
-- Local Registered = numRegistered()
-- Local LoggedInToday = numLoggedInToday()
Local currentX = 13
Local currentY = 7

function drawCursor()
 term.clear()
 term.setCursorPos(currentX, currentY)
  write("<--")
end
--[[
function numRegistered()
 print "6"
end

function numLoggedInToday()
 print "2"
end
]]--

shell.run("clear")
print " --------------------------------------------------"
print("| "..Author.."										 "..Version.." |")
print " --------------------------------------------------"
print ""
--[[
print " --------------------------------------------------"
print("| Registered users: "..Registered)
print("| Users logged in today: "..LoggedInToday)
print " --------------------------------------------------"
]]--
sleep(.5)

print "What do you want to do?"
print ""
print " -----------"
print "| Login    |"
print "| Register|"
print "| Shutdown|"
print " -----------"

while true do
 drawCursor()
local e, key = os.pullEvent("key")
 if key == 17 or key == 200 then
  currentY = currentY -1
 elseif key == 31 or key == 208 then
  currentY = currentY +1
 end
end

-- shell.run("Login")
-- shell.run("Register")

Also, don't mind the commented code, i'm trying to let it display the number of accounts registered and logged in today.

Snakybo, on 06 April 2012 - 04:45 AM said:

@ComputerCraftFan Thanks, but if I put it in my code everything dissapears except the cursor, I tried finding a way around the term.clear()but it didn't work. Also, i'm trying to block the cursor from going outside the selectbox (Y: 7 to Y: 10)

Here's my code so far:

Local Author = "Snakybo inc."
Local Version = "1.0"
-- Local Registered = numRegistered()
-- Local LoggedInToday = numLoggedInToday()
Local currentX = 13
Local currentY = 7

function drawCursor()
term.clear()
draw()
term.setCursorPos(currentX, currentY)
  write("<--")
end
--[[
function numRegistered()
print "6"
end

function numLoggedInToday()
print "2"
end
]]--

--shell.run("clear")

function draw()
print " --------------------------------------------------"
print("| "..Author.."										 "..Version.." |")
print " --------------------------------------------------"
print ""
--[[
print " --------------------------------------------------"
print("| Registered users: "..Registered)
print("| Users logged in today: "..LoggedInToday)
print " --------------------------------------------------"
]]--
sleep(.5)

print "What do you want to do?"
print ""
print " -----------"
print "| Login	|"
print "| Register|"
print "| Shutdown|"
print " -----------"
end

while true do
drawCursor()
local e, key = os.pullEvent("key")
if key == 17 or key == 200 then
  currentY = currentY -1
elseif key == 31 or key == 208 then
  currentY = currentY +1
end
end

-- shell.run("Login")
-- shell.run("Register")

Also, don't mind the commented code, i'm trying to let it display the number of accounts registered and logged in today.

Try the code now

Also, i'm trying to block the cursor from going outside the selectbox (Y: 7 to Y: 10)

You can edit the while true do to this:

local e, key = os.pullEvent("key")
if key == 17 or key == 200 then
  if currentY > 7 then
    currentY = currentY -1
 end
elseif key == 31 or key == 208 then
 if currentY < 10 then
  currentY = currentY +1
end
end
end

Thanks alot! But do you happen to know the Keyboard Code for the enter key? So I can make it open a program

Snakybo, on 06 April 2012 - 06:06 PM said:

Thanks alot! But do you happen to know the Keyboard Code for the enter key? So I can make it open a program

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