template

gistfile1.txt

--# Notes
--[[
This is a template for creating multi-tab projects
That is, projects where each tab can be run independently

This can be used for step by step tutorials, with users able to choose which tab runs

It can also be used for multi-stage projects, eg games where there are several stages like
* start menu
* play (maybe with multiple levels)
* win
* lose
Each of these can have their own tab, with its own draw function, touch function, etc

The way it works is that each tab (in this case, T1, T2, T3, T4) contains a table (called T1, T2, T3, T4).
That table contains the functions setup, draw, touched, and any other functions needed by that tab

If you don't understand how a table can contain functions, then it would help you to understand "pointers". These are covered in Lua for Beginners, here - https://www.dropbox.com/s/qh1e7ft4rvhlpt2/Lua%20for%20beginners.pdf
--]]
--# T1
T1={}

function T1.setup()
    print("T1")
end

function T1.draw()
    background(50)
    fontSize(48)
    text("T1",400,400)
end

--# T2
T2={}

function T2.setup()
    print("T2")
end

function T2.draw()
    background(50)
    fontSize(48)
    text("T2",400,400)
end
--# T3
T3={}

function T3.setup()
    print("T3")
end

function T3.draw()
    background(50)
    fontSize(48)
    text("T3",400,400)
end
--# T4
T4={}

function T4.setup()
    print("T4 - touch the screen")
end

function T4.draw()
    background(50)
    fontSize(48)
    text("T4",400,400)
end

function T4.touched(touch)
   print("You touched",touch.x,touch.y)
end
--# Main
--Main

--This code manages which Code tab is run
--it remembers your last choice, and if you select a different one, it runs that instead
function setup()
    tabs={T1,T2,T3,T4}
    LastCode=readProjectData("Code") or 1
    parameter.integer("Choose_a_tab",1,#tabs,LastCode,RunCode)
    parameter.action("Previous tab", RunPrevious)
    parameter.action("Next tab",RunNext)
end

function RunCode()
    output.clear()
    saveProjectData("Code",Choose_a_tab)
    print("CODE "..Choose_a_tab)
    if c and c.cleanup then c.cleanup() end
    c=tabs[Choose_a_tab]
    c.setup()
end

function RunPrevious()
    if Choose_a_tab>1 then 
        Choose_a_tab=Choose_a_tab-1 
        RunCode()
    end
end
function RunNext()
    if Choose_a_tab<#tabs then 
        Choose_a_tab=Choose_a_tab+1 
        RunCode()
    end
end

function draw()
   c.draw() 
end

function collide(contact)
    if c.collide then c.collide(contact) end
end

function touched(touch)
    if c.touched then c.touched(touch) end
end