I have been looking through the examples in Codea - specifically the ‘Spritely’ example because it uses an info button to display instructions - however, I am having difficulty reading through the various tabs trying to decipher and pick out the relevant code to help me do this. I must not be fully understanding the touch class with regard to this? I have tried examples and I get output that tells me the button has been activated… (using a sprite as a button - thanks ChrisF!)… also that a single or double tap has occurred and swiping too but I just can’t work out how to make the action bring up a window / new screen. I am new to coding in general so sorry in advance if this is a dumb question but is there anyone that could explain this in simple terms to me and help me out please?
Here is something I had from long ago that might give you an idea. There are a lot of different ways to do what you are asking.
displayMode(FULLSCREEN)
supportedOrientations(PORTRAIT) -- set for portrait mode
function setup()
func=menu
end
function draw()
func()
end
function menu()
background(0,0,200)
w=WIDTH/2 -- set width value
eh=HEIGHT-400 -- set height of different options
nh=HEIGHT-600 -- eh easy, nh normal, hh hard
hh=HEIGHT-800
fontSize(48) -- set font size
fill(255,0,0) -- set font color
menuTitle1="Main Menu" -- main title
menuTitle2="Select Option"
text(menuTitle1,w,HEIGHT-100) -- display titles
text(menuTitle2,w,HEIGHT-200)
fill(0,255,0) -- set easy values
t1="Easy"
text(t1,w,eh)
w1,h1=textSize(t1) -- width and height of easy text
t2="Normal" -- set normal values
text(t2,w,nh)
w2,h2=textSize(t2) -- width and height of normal text
t3="Hard" -- set hard values
text(t3,w,hh)
w3,h3=textSize(t3) -- width and height of hard text
end
function easy()
background(40,40,50)
text("EASY screen",WIDTH/2,HEIGHT/2)
text("tap screen for menu",WIDTH/2,HEIGHT/2-200)
end
function normal()
background(40,40,50)
text("NORMAL screen",WIDTH/2,HEIGHT/2)
text("tap screen for menu",WIDTH/2,HEIGHT/2-200)
end
function hard()
background(40,40,50)
text("HARD screen",WIDTH/2,HEIGHT/2)
text("tap screen for menu",WIDTH/2,HEIGHT/2-200)
end
function touched(t)
if t.state==BEGAN then
if func ~= menu then
func=menu
return
end
if func==menu then
if t.x>w-w1/2 and t.x<w+w1/2 and t.y>eh-h1/2 and t.y<eh+h1/2 then
func=easy
end
if t.x>w-w2/2 and t.x<w+w2/2 and t.y>nh-h2/2 and t.y<nh+h2/2 then
func=normal
end
if t.x>w-w3/2 and t.x<w+w3/2 and t.y>hh-h3/2 and t.y<hh+h3/2 then
func=hard
end
end
end
end
This is great! It makes it really clear for me and I now totally get it. Thanks so much … 
this is really what i’m looking for but I feel I dont understand the everything here. Please bare with the noob questions.
Why doesn’t it work calling menu() from draw()?
When does the easy, medium and hard functions get called?
trying to learn how to set up buttons but feel i dont really get it.
If you call menu() from draw, that’s all you’ll be calling 60 times per second. The call to func() allows you to change what function is getting called. Func() starts out as being Menu, so that’s what gets executed. While you’re in menu, you have the option to call easy, normal, or hard depending on what button you touch. When you make a selection, Func is assigned a function ( easy, normal, or hard ) and that’s what gets called in draw. You just keep moving between screens based on what you select.
thx dave for super quick response. I think what was confusing to me was that func could change which function it was in that way.
Ok, so here’s another noob follow up question. I used your code and trying to apply it to how think / would like to design the code. Problem is: I dont understand why it doesnt write “click” when state is set to 1 by the touch event. I know the code gets into the if but why doesnt it print “click”?
-- z001
-- displayMode(FULLSCREEN)
-- supportedOrientations(PORTRAIT) -- set for portrait mode
-- Use this function to perform your initial setup
function setup()
print("Hello World!")
createMainMenu()
state = 0
end
-- This function gets called once every frame
function draw()
-- This sets a dark background color
background(0, 0, 0)
-- This sets the line thickness
strokeWidth(5)
-- place main menu
createMainMenu()
end
function createMainMenu()
-- set positions for main menu
menuLeftColumn = WIDTH/4
menuRightColumn = menuLeftColumn+WIDTH/2
menuTopRow = HEIGHT-850
menuBottomRow = HEIGHT-910
-- set style of main menu
fill(255,255,255)
fontSize(24)
font("AmericanTypewriter-Bold")
-- set main menu text
create = "create"
explore = "explore"
use = "use"
endDay = "end day"
-- set size of menu buttons
createWidth, createHeight = textSize(create)
-- draw buttons
text(explore, menuLeftColumn, menuTopRow)
text(create, menuRightColumn, menuTopRow)
if state == 1 then
w = WIDTH/2
h = HEIGHT/2
fill(255,255,255)
fontSize(42)
text("click"' w, h)
print(state)
end
end
function touched(t)
if t.state==BEGAN then
if t.x>menuLeftColumn-createWidth/2 and t.x<menuLeftColumn+createWidth/2 and t.y>menuTopRow-createHeight/2 and t.y<menuTopRow+createHeight/2 then
print("create")
state = 1
end
end
end
In FULLSCREEN mode you cant see the output panel where things are printed. Comment this line to see it.
In the section “if state == 1 then” the line of code “text(“click” ’ w, h)” is wrong. The ’ should be a , . It should be text(“click”, w,h) . Also, when to tap explore, you set state to 1 and print the value 1 every time draw is called, 60 times a second. Each time you tap explore, the word click prints, but is pushed off the top of the print window by all the 1’s printing.
Try changing the if statement to this. The problem is you’re mixing text and print. If you want print to work, then set state to 0. If you want text to show, then you don’t set state to 0 but print will show 60 times a second which is what you don’t want to do.
if state == 1 then
w = WIDTH/2
h = HEIGHT/2
fill(255,255,255)
fontSize(42)
text("click", w, h) -- fixed the error here
print(state)
state=0 -- set state back to 0
end
Oh, fantastic! I just had the print there for debug reasons. Maybe i should have said so.
Thinking of what im trying to achieve i think your example will be perfect. Will do some more coding and see how it goes.
Once again, super big thanks!