Lua Programming: Difference between revisions

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The TI-Nspire allows programming with the Lua language through a hidden application "TI.ScriptApp".
The TI-Nspire allows, since OS v3.0, users to run Lua scripts.


This page describes how to setup a Lua development environment and documents the currently known Lua functions for the Nspire, and a brief description of how to use the functions.
==Prerequisites==


Note: Neither the ''io'' nor ''os'' libraries are present for the TI-Nspire, which seems to be running a light version of Lua 5.1.4.
Lua is only supported starting from OS v3.0.1. You can create Lua applications using the built-in script editor in the TI-Nspire computer software or one of the following third-party tools:


==Prerequisites==
'''For any OS''':
Lua is only supported starting from OS v3.0.1. Creating Lua scripts is currently not officially supported by TI, you need one of the following third-party tools to convert Lua scripts to TI-Nspire documents:
*[https://github.com/ndless-nspire/Luna Luna] (cross-platform) [[https://www.omnimaga.org/news/'luna'-is-here-and-converts-your-lua-files-into-3-0-2-compatible-tns-files/ forum thread]]
*[http://www.mirari.fr/4Adg LUAtoTNS.sh] (bash script, works on Linux, Mac OS and Unix, or Windows + Cygwin or Windows + MSYS). Requires 7za (7-zip)
'''For OS < 3.0.1''': these tools won't work with the OS 3.0.2 since the format used is now blocked
*[http://www.ticalc.org/archives/files/fileinfo/437/43704.html LUAtoTNS.sh] (bash script, works on Linux, Mac OS and Unix, or Windows + Cygwin or Windows + MSYS).
*[http://www.mirari.fr/KbOD maketns.py] (Python script, cross-platform)
*[http://www.mirari.fr/KbOD maketns.py] (Python script, cross-platform)
*[http://www.omnimaga.org/index.php?action=downloads;sa=view;down=651 lua2ti] (Windows + .NET Framework v4.0)
*[https://www.omnimaga.org/files/User-Contributed-Calculator-Games-amp-Development-Tools/TI-Nspire-amp-TI-Nspire-CAS/TI-Nspire-Programming-Tools/lua2ti.zip lua2ti] (Windows + .NET Framework v4.0)
*[http://www.omnimaga.org/index.php?action=downloads;sa=view;down=652 lua2ti_linux] (Linux + Mono v3.5)
*[https://www.omnimaga.org/files/User-Contributed-Calculator-Games-amp-Development-Tools/TI-Nspire-amp-TI-Nspire-CAS/TI-Nspire-Programming-Tools/lua2ti_linux.zip lua2ti_linux] (Linux (No longer requires Mono, it is now a native Linux binary!))
 
You may also want to install Lua [https://www.lua.org/download.html on your computer]: <tt>luac -p</tt> can be used to check the syntax of your script before running it on a TI-Nspire or an emulator.
==Standard Library==
 
*'''_G''' - Global Variable - A global variable (not a function) that holds the global environment (that is, _G._G = _G). Lua itself does not use this variable; changing its value does not affect any environment, nor vice-versa. (Use setfenv to change environments.)  - taken from Lua docs
*'''print''' - print (···) - Receives any number of arguments, and prints their values to stdout, using the tostring function to convert them to strings. print is not intended for formatted output, but only as a quick way to show a value, typically for debugging. For formatted output, use string.format.  - taken from Lua Docs
*'''tostring''' - tostring (e) - Receives an argument of any type and converts it to a string in a reasonable format. For complete control of how numbers are converted, use string.format. If the metatable of e has a "__tostring" field, then tostring calls the corresponding value with e as argument, and uses the result of the call as its result. - taken from Lua Docs.
*'''xpcall''' - xpcall (f, err) - xpcall calls function f in protected mode, using err as the error handler. Any error inside f is not propagated; instead, xpcall catches the error, calls the err function with the original error object, and returns a status code. Its first result is the status code (a Boolean), which is true if the call succeeds without errors. In this case, xpcall also returns all results from the call, after this first result. In case of any error, xpcall returns false plus the result from err. - taken from Lua Docs
*'''select''' - select (index, ···)- If index is a number, returns all arguments after argument number index. Otherwise, index must be the string "#", and select returns the total number of extra arguments it received. - Taken from Lua Docs
*'''getmetada''' -
*'''upack''' -
 
==GC (as in Graphics Context)==
 
Note: You need to add “gc:” before each of these commands in order to use them.
ex. gc:setAlpha().
 
*'''begin''' -
 
*'''clipRect''' -
 
*'''drawArc'''(x, y, width, height, start angle, finish angle) Note, to draw a circle, use drawArc(x - diameter/2, y - diameter/2, diameter,diameter,0,360) where x and y are the coordinates of the middle.
 
*'''drawImage''' ? First argument in format “TI.Image”
 
*'''drawLine'''(xstart, ystart, xend, yend) Draws a line starting at the point (xstart,ystart) and ending at the point (xend, yend)
 
*'''drawPolyLine'''(int list1 [,int list2, .., int listN]) Draw a shape from a list contaning successively the x and y coordinates of each point the line have to draw. ex : drawPolyLine(0,0, 0,100, 100,100, 100,0, 0,0) = drawRect(0,0,100,100).  If there are multiple argument (which can be 4 elements list to represent lines), each list has to contain an even number of element.
 
*'''drawRect'''(x, y, xwidth, yheight) Draws a rectangle at (x,y) with the “x” side being “xwidth” long and the “y” side being “yheight” long
 
*'''drawString'''(string, x, y, PositionString) PositionString is the string’s anchor point and can be “bottom”, “middle”, or “top”.  
 
*'''fillArc'''(x, y, width, height, start angle, finish angle) see drawArc


*'''fillPolygon'''(int list1 [,int list2, .., int listN]) see drawPolyLine
==API==


*'''fillRect'''(x, y, width, height) see drawRect
The documentation is now maintained in the "[http://wiki.inspired-lua.org Inspired Lua Wiki]".
Please go there in order to have a full detailed documentation based on TI's information.


*'''finish''' -
==XML==


*'''getStringHeight'''(string)
===Basic structure===


*'''getStringWidth'''(string)
<syntaxhighlight lang="xml">
<wdgt
    xmlns:sc="urn:TI.ScriptApp" type="TI.ScriptApp" ver="1.0">


*'''isColorDisplay''' Bool (Read-only) Returns 1 if color, 0 if not.
    <sc:mFlags>1024</sc:mFlags>
    <sc:value>8</sc:value>
    <sc:cry>0</sc:cry>
    <sc:legal>none</sc:legal>
    <sc:schk>false</sc:schk>


*'''setAlpha''' ≈ transparency ?
    <sc:md>
        <sc:mde name="_VER" prop="134217728">1:1</sc:mde>
        <sc:mde name="TITLE" prop="2147549184">Hello</sc:mde>
        <sc:mde name="TARAL" prop="134217728">2:5</sc:mde>
    </sc:md>


*'''setColorRGB'''(red, green, blue) Values range from 0 to 255.
    <sc:script version="33882629" id="1">
-- Lua script, XML encoded
    </sc:script>


*'''setFont'''(font, type, size)
    <sc:state>
        return {} -- Lua save state
    </sc:state>
</wdgt></syntaxhighlight>


*'''font''' {“sansserif”, ..}, type {“b”, “r”, “i”}, size(int)
===Script tags===


*'''setPen'''(size, smooth)
====sc:script====


*'''size''' {“thin”, “medium”, ..}, smooth {“smooth”, ..}
{| class="wikitable"
|-
! scope="col"| attribute
! scope="col"| description
|-
| version
| taral and reqal versions, one byte per digit (for older OSes?)
|-
| id
| 1 = normal script, 2 & 3 = Question and Answer
|}


==Events==
===Script metadata configuration===


*on.charIn - (string) is called when the indicated string corresponds to a pressed alpha key. To wrap an event on the “h” key, add the *on.charIn(“h”) link. // Be more explicit here
{| class="wikitable"
*on.paint - (gc) is called when the GUI is painted
|-
*on.arrowKey - (key) is called when an arrow key from the clickPad/TouchPad is pressed
! scope="col"| Name
! scope="col"| Prop
! scope="col"| Description
! scope="col"| Example
|-
| TARAL
| 134217728
| TARget ApiLevel
| <code><nowiki><sc:mde name="TARAL" prop="134217728">2:2</sc:mde></nowiki></code>
|-
| REQAL
| 134217728
| REQuired ApiLevel
| <code><nowiki><sc:mde name="REQAL" prop="134217728">2:0</sc:mde></nowiki></code>
|-
| _VER
| 134217728
| TNS Version
| <code><nowiki><sc:mde name="_VER" prop="134217728">1:1</sc:mde></nowiki></code>
|-
| TITLE
| 2147549184
| ScriptApp title
| <code><nowiki><sc:mde name="TITLE" prop="2147549184">Hello</sc:mde></nowiki></code>
|-
| -
| 270532608
| Lua meta script
| <code><nowiki><sc:mde name="TEST" prop="270532608">--lua code</sc:mde></nowiki></code>
|-
| BLERQ
| 134217728
| BLE ReQuire - require ble libs
| <code><nowiki><sc:mde name="BLERQ" prop="134217728">1</sc:mde></nowiki></code>
|-
| _FFunc
| -
| FailMe function (error catching)
| Not known
|-
| _TRACE
| -
| Trace/log?
| Not known
|}

Latest revision as of 14:48, 21 June 2019

The TI-Nspire allows, since OS v3.0, users to run Lua scripts.

Prerequisites

Lua is only supported starting from OS v3.0.1. You can create Lua applications using the built-in script editor in the TI-Nspire computer software or one of the following third-party tools:

For any OS:

For OS < 3.0.1: these tools won't work with the OS 3.0.2 since the format used is now blocked

  • LUAtoTNS.sh (bash script, works on Linux, Mac OS and Unix, or Windows + Cygwin or Windows + MSYS).
  • maketns.py (Python script, cross-platform)
  • lua2ti (Windows + .NET Framework v4.0)
  • lua2ti_linux (Linux (No longer requires Mono, it is now a native Linux binary!))

You may also want to install Lua on your computer: luac -p can be used to check the syntax of your script before running it on a TI-Nspire or an emulator.

API

The documentation is now maintained in the "Inspired Lua Wiki". Please go there in order to have a full detailed documentation based on TI's information.

XML

Basic structure

<wdgt
    xmlns:sc="urn:TI.ScriptApp" type="TI.ScriptApp" ver="1.0">

    <sc:mFlags>1024</sc:mFlags>
    <sc:value>8</sc:value>
    <sc:cry>0</sc:cry>
    <sc:legal>none</sc:legal>
    <sc:schk>false</sc:schk>

    <sc:md>
        <sc:mde name="_VER" prop="134217728">1:1</sc:mde>
        <sc:mde name="TITLE" prop="2147549184">Hello</sc:mde>
        <sc:mde name="TARAL" prop="134217728">2:5</sc:mde>
    </sc:md>

    <sc:script version="33882629" id="1">
	-- Lua script, XML encoded
    </sc:script>

    <sc:state>
        return {} -- Lua save state
    </sc:state>
</wdgt>

Script tags

sc:script

attribute description
version taral and reqal versions, one byte per digit (for older OSes?)
id 1 = normal script, 2 & 3 = Question and Answer

Script metadata configuration

Name Prop Description Example
TARAL 134217728 TARget ApiLevel <sc:mde name="TARAL" prop="134217728">2:2</sc:mde>
REQAL 134217728 REQuired ApiLevel <sc:mde name="REQAL" prop="134217728">2:0</sc:mde>
_VER 134217728 TNS Version <sc:mde name="_VER" prop="134217728">1:1</sc:mde>
TITLE 2147549184 ScriptApp title <sc:mde name="TITLE" prop="2147549184">Hello</sc:mde>
- 270532608 Lua meta script <sc:mde name="TEST" prop="270532608">--lua code</sc:mde>
BLERQ 134217728 BLE ReQuire - require ble libs <sc:mde name="BLERQ" prop="134217728">1</sc:mde>
_FFunc - FailMe function (error catching) Not known
_TRACE - Trace/log? Not known
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