--codeExampleStart 1 -----------------------------------------------------------
-- Hello World! for the console

print( "Hello World!" )

="Hello World!"

s = "Hello World!"

print( s )
--codeExampleEnd 1

--codeExampleStart 4 -----------------------------------------------------------
-- Loops - how fast are they?

t=nxt.TimerRead()
for i=1,10000 do
end
=nxt.TimerRead()-t

t=nxt.TimerRead()
for i=1,10000 do
  j=i*4
end
=nxt.TimerRead()-t
=j

t=nxt.TimerRead()
for i=1,10000 do
  k=i*7
  j=i*4+k
end
=nxt.TimerRead()-t
=k,j
--codeExampleEnd 4

--codeExampleStart 5 -----------------------------------------------------------
-- Lua arrays
fruits = { "apples", "oranges", "bananas", "plums", "grapefruit" }

for n,v in ipairs(fruits) do
  print( n, v )
end
  
table.sort(fruits)

for n,v in ipairs(fruits) do
  print( n, v )
end
--codeExampleEnd 5

--codeExampleStart 6 -----------------------------------------------------------
-- Lua associative tables
inventory = { apples=5, oranges=2, bananas=0, plums=4, grapefruit=1 }

for k,v in pairs(inventory) do
  print( k, v )
end

inventory.apples = inventory.apples + 3
inventory.plums  = inventory.plums  - 2

for k,v in pairs(inventory) do
  print( k, v )
end
--codeExampleEnd 6

--codeExampleStart 1 -----------------------------------------------------------
-- Hello World! for the LCD

nxt.DisplayClear()
nxt.DisplayText( "Hello World!" )
--codeExampleEnd 1

--codeExampleStart 2 -----------------------------------------------------------
-- Demonstration of setting random display pixels

function RandomDisplayPixel()
  local x,y
  nxt.DisplayClear()

  for i=1,10000 do
    x = nxt.random(100)
    y = nxt.random(64)
    nxt.DisplayPixel(x,y)
  end

end

-- Another way of writing this without local variables is

function RandomDisplayPixel()
  nxt.DisplayClear()

  for i=1,10000 do
    nxt.DisplayPixel(nxt.random(100),nxt.random(64))
  end

end
--codeExampleEnd 2

--codeExampleStart 3 -----------------------------------------------------------
-- Reading the Display and Writing it to the Console

function DumpDisplay()
  for x=0,99 do
    s = ""
    for y=0,63 do
      if 0 ~= nxt.DisplayGetPixel(x,63-y) then
        s = s .. "*"
       else
        s = s .. " "
      end
    end
    print( s )
  end
end
--codeExampleEnd 3


--codeExampleStart 3 -----------------------------------------------------------
-- Read sound sensor until the orange button is pressed
function SoundRead(port)

  nxt.InputSetType(port,0)
  nxt.InputSetState(port,1,0)
  nxt.InputSetDir(port,1,1)

  repeat
    print( nxt.TimerRead(), nxt.InputGetStatus(port) )
  until( 8 == nxt.ButtonRead() )
end

-- And using the function - press the orange button on the NXT to stop it
SoundRead(2)
--codeExampleEnd 3

--codeExampleStart 4 -----------------------------------------------------------
-- Read sound sensor and scale the results
function SoundScale(port,sensitive)

  nxt.InputSetType(port,0)

  sensitive = sensitive or 0

  if 0 == sensitive then nxt.InputSetState(port,0,1)
                    else nxt.InputSetState(port,1,0)
  end

  nxt.InputSetDir(port,1,1)

  repeat
    local raw = nxt.InputGetStatus(port)

    -- Check if raw value is less than minimum, adjust if needed
    if raw < 162 then raw = 0
                 else raw = raw - 162
    end

    -- Scale the result
    raw = (raw*100)/83

    -- Check if raw value is greater than maximum, adjust if needed
    if raw > 1023 then raw = 1023
    end

    -- Invert the raw value
    raw = 1023 - raw

    -- Make a string that represents the volume...

    print( nxt.TimerRead(), string.rep("*", raw/16 ) )
  until( 8 == nxt.ButtonRead() )
end

-- And using the function - press the orange button on the NXT to stop it
SoundScale(2,0)
--codeExampleEnd 4