function launchButtonPressed {
  run "launch"(
    targetApo:TEXT:ToNumber(),
    gravTurnStart:TEXT:ToNumber(),
    gravPitch:TEXT:ToNumber(),
    initialPitch:TEXT:ToNumber(),
    minimumPitch:TEXT:ToNumber()
  ).
}

function nodeButtonPressed {
  run "execnode".
}

// Main UI.
local interface is gui(200).
set interface:X to 200.
set interface:Y to 800.

// Launch button
local hBox is interface:AddHBox().
hBox:AddLabel("Initial Pitch").
local initialPitch is hBox:AddTextField("85").

local hBox is interface:AddHBox().
hBox:AddLabel("Minimum Pitch").
local minimumPitch is hBox:AddTextField("5").

local hBox is interface:AddHBox().
hBox:AddLabel("Gravity Turn @").
local gravTurnStart is hBox:AddTextField("8000").

local hBox is interface:AddHBox().
hBox:AddLabel("Gravity Pitch").
local gravPitch is hBox:AddTextField("75").

local hBox is interface:AddHBox().
hBox:AddLabel("Target Apoapsis").
local targetApo is hBox:AddTextField("80000").

local launchButton is interface:AddButton("Launch").
set launchButton:onClick to launchButtonPressed@.

local nodeButton is interface:AddButton("Execute Node").
set nodeButton:onClick to nodeButtonPressed@.

interface:show().

wait until false.