Finally, code that works to orbit + creates a circ node.

boot/rocket.ks

@@ -1,10 +1,13 @@
 // rocketOS bootstrapping sequence
 
+// To maximize space, remove this file first thing. The in-memory copy
+// will still run.
+deletepath("/boot/rocket").
+
 // Install software.
 runpath("0:/bootstrap/rocket").
 
 // Set OS to boot and restart.
 set core:bootfilename to "/ui/rocket".
 
-deletepath("/boot/rocket").
 reboot.

bootstrap/rocket.ks

@@ -2,4 +2,4 @@ compile "0:/ui/rocket" to "1:/ui/rocket".
 compile "0:/lib/navigation" to "1:/lib/navigation".
 compile "0:/lib/throttle" to "1:/lib/throttle".
 compile "0:/launch" to "1:/launch".
-copypath("0:/nextnode", "1:/nextnode"). // smaller when compiled
+copypath("0:/execnode", "1:/execnode"). // smaller when compiled

launch.ks

@@ -5,6 +5,7 @@ parameter APOAPSIS_TARGET is 80000.
 parameter GRAVITY_TURN_START is 8000.
 parameter GRAVITY_PITCH is 75.
 parameter INITIAL_PITCH is 85.
+parameter MINIMUM_PITCH is 40.
 SensorCheck().
 
 // Configure subsystems.
@@ -36,15 +37,16 @@ lock STEERING to heading(90,90,270).
 stage.
 
 wait until SHIP:ALTITUDE > 200.
-lock STEERING to heading(90, GRAVITY_PITCH, 270).
+lock STEERING to heading(90, INITIAL_PITCH, 270).
 
 wait until SHIP:ALTITUDE > GRAVITY_TURN_START.
 
 print "Pitching for gravity turn".
 
-// Perform initial pitch...
+// Pitch over...
 lock STEERING to heading(90, GRAVITY_PITCH, 270).
-// Wait until we have rotated to that pitch...
+print ("Locked to heading " + STEERINGMANAGER:TARGET). // debug?
+// Wait until we have rotated to (approximately) that pitch...
 wait until vectorangle(
   SHIP:FACING:FOREVECTOR,
   STEERINGMANAGER:TARGET:FOREVECTOR)
@@ -61,17 +63,21 @@ until SHIP:ORBIT:APOAPSIS > 80000 {
   // todo: we may need different values for bodies other than Kerbin.
   local newHeading is lookdirup(SHIP:SRFPROGRADE:FOREVECTOR,
     heading(90, 0, 270):TOPVECTOR).
-  if GetPitch(newHeading:FOREVECTOR) < 40 {
+  if GetPitch(newHeading:FOREVECTOR) < MINIMUM_PITCH {
-    set newHeading to heading(90, 40, 270).
+    set newHeading to heading(90, MINIMUM_PITCH, 270).
   }
   lock STEERING to newHeading.
   wait 0.001.
 }
 
-SHIP:ADD(CreateCircularizationNode(SHIP:ORBIT:ETA:APOAPSIS)).
+lock THROTTLE to 0.0.
+set SHIP:CONTROL:PILOTMAINTHROTTLE to 0.
+wait 0.001.
+print "Target apoapsis acquired. Creating maneuver node".
+
+AddCircularizationNode().
 
 print "Releasing controls. Circularization maneuver added. Good luck, Kerman!".
-set SHIP:CONTROL:PILOTMAINTHROTTLE to 0.
 unlock THROTTLE.
 unlock STEERING.
 SAS on.

lib/navigation.ks

@@ -6,18 +6,19 @@ function GetPitch {
   return 90 - vectorangle(SHIP:UP:FOREVECTOR, v).
 }
 
-function CreateCircularizationNode {
+function AddCircularizationNode {
   parameter usePeriapsis is false.
   local target is SHIP:ORBIT:APOAPSIS.
-  local t is SHIP:ORBIT:ETA:APOAPSIS.
+  local t is TIME + SHIP:ORBIT:ETA:APOAPSIS.
   if usePeriapsis {
     set target to SHIP:ORBIT:PERIAPSIS.
     set t to SHIP:ORBIT:ETA:PERIAPSIS.
   }
   local n is Node(t, 0, 0, 0).
+  add(n).
 
   // move fast until we pass our target.
-  until (usePeriapsis and n:ORBIT:APOAPSIS < target) or n:ORBIT:PERIAPSIS > target {
+  until (usePeriapsis and n:ORBIT:APOAPSIS <= target) or n:ORBIT:PERIAPSIS >= target {
     set n:PROGRADE to n:PROGRADE + 1.
   }
 
@@ -25,6 +26,4 @@ function CreateCircularizationNode {
   until (usePeriapsis and n:ORBIT:APOAPSIS > target) or n:ORBIT:PERIAPSIS < target {
     set n:PROGRADE to n:PROGRADE - 0.01.
   }
-
-  return n.
 }

ui/rocket.ks

@@ -2,26 +2,30 @@ function launchButtonPressed {
   run "launch"(
     targetApo:TEXT:ToNumber(),
     gravTurnStart:TEXT:ToNumber(),
-    initialPitch:TEXT:ToNumber()
+    gravPitch:TEXT:ToNumber(),
+    initialPitch:TEXT:ToNumber(),
+    minimumPitch:TEXT:ToNumber()
   ).
 }
 
 function nodeButtonPressed {
-  run "executenode".
+  run "execnode".
 }
 
-// Button panel
+// Main UI.
-CreateGUI().
-
 local interface is gui(200).
 set interface:X to 200.
-set interface:Y to 900.
+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("40").
+
 local hBox is interface:AddHBox().
 hBox:AddLabel("Gravity Turn @").
 local gravTurnStart is hBox:AddTextField("8000").
@@ -38,7 +42,7 @@ local launchButton is interface:AddButton("Launch").
 set launchButton:onClick to launchButtonPressed@.
 
 local nodeButton is interface:AddButton("Execute Node").
-set launchButton:onClick to nodeButtonPressed@.
+set nodeButton:onClick to nodeButtonPressed@.
 
 interface:show().