Omnimaga
Calculator Community => TI Calculators => Lua => Topic started by: hellninjas on June 08, 2012, 09:47:12 am
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I started Lua :D and while going through a tutorial I ran into an error in my code..
answer = "" --This is the error, i'm getting "unexpected symbol near 'char(226)" D:
function on.charIn(char)
answer = answer..char
var.store("line3",answer)
-- Refresh the screen after each key is pressed.
platform.window:invalidate()
end
function on.backspaceKey()
answer = answer:usub(0,-2)
var.store("line3",answer)
platform.window:invalidate()
end
EDIT: I am using ocLua right now, maybe I'll get notepad++ later :P
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one quick question, what os version are you using?
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Already been solved, it was OS 3.1 CX, but the error was that i had (-) instead of a minus sign.
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that would do it, i had just tried it and didnt get any errors
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Awesome, now for my other question, how would I code in a menu that the user could select stuff by pushing the normal arrow keys?
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do you mean like create, one of the toolpallete menus that are in the calculator app, or create your own from scratch?
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My own hopefully, but the toolpallete would also be nice to learn :D
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I could probably make a very simple example and post it, also go to inspired-lua.org for the toolpallete question, even though it has been updated for 3.2, not alot has changed when it comes to creating the toolpallete
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The events [lua]on.arrowUp[/lua] and [lua]on.arrowDown[/lua] will be called when pressing up/down.
In this function you will need increment/decrement an variable that contains a number representing the menu item that is selected.
After setting this variable you need to run [lua]platform.window:invalidate()[/lua]. This will trigger the display to be invalidate, so [lua]on.paint[/lua] will run.
In on.paint you need to draw your menu stuff.
This sounds probably too complex for a beginner :P
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not completely Jim but im thinking I would make "function on.arrowUp" then the rest of the code and then some sort of while statement showing while the position equals a certain amount, it will display a square in that position.. or something like that :P
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just remember that when you want to update the screen you'l exit the while loop..
you also can't keep track of the arrowkeys while drawing.
you have to use a variable to remember the last item selected, and draw again when an arrow is pressed
(this is somehow the same as jim said, but i thought you didn't caught it well because of that while statement ;) )
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Im currently learning LUA too! But for computers.
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well, the nspire lua is quite a lot different than the pc lua, but it's nice :) you should come to our side too xp
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So here is a very very very basic type of menu. It has no sub-menus because I didnt have the time to do it today.
This should be written as a class, but since you probably dont know how to make classes, I didnt write it that way to make it less confusing.
menu = {{text = "small", selected = true, id = 1},
{text = "larger", selected = false, id = 2},
{text = "even larger", selected = false, id = 3},
{text = "sml", selected = false, id = 4}}--our menu
menuDrawn = false--menu flag
function on.paint(gc)
gc:setFont("serif", "r",7)
if menuDrawn then
--dynamicly find the width
local width = 0
local strHld = 0
for i = 1, table.maxn(menu) do
strHld = gc:getStringWidth(menu[i].text)
if strHld > width then
width = strHld + 1
end
end
strHld = gc:getStringHeight("Hh") --find the strings height
local height = strHld * table.maxn(menu)--find the total height
--fill grey rectangle
gc:setColorRGB(175, 175, 175)
gc:fillRect(0, 0, width, height)
--draw black rectangle
gc:setColorRGB(0, 0, 0)
gc:drawRect(0, 0, width, height)
--draw the strings
local y = 5
for i = 1, table.maxn(menu) do
if menu[i].selected then --reverse video
gc:fillRect(0, y - 6, width, strHld)
gc:setColorRGB(255, 255, 255)
gc:drawString(menu[i].text, 1, y, "middle")
gc:setColorRGB(0, 0, 0)
else
gc:drawString(menu[i].text, 1, y, "middle")
end
gc:drawLine(0, y + 7, width, y + 7)
y = y + strHld
end
end
end
function on.contextMenu() --pressed ctrl+menu
menuDrawn = not(menuDrawn)
end
function on.arrowUp() --up arrow was pressed
local fnd = findCurSelection()
if menu[fnd].id ~= 1 then
menu[fnd - 1].selected = true
else
menu[table.maxn(menu)].selected = true
end
menu[fnd].selected = false
platform.window:invalidate()
end
function on.arrowDown() --down arrow was pressed
local fnd = findCurSelection()
if menu[fnd].id ~= table.maxn(menu) then
menu[fnd + 1].selected = true
else
menu[1].selected = true
end
menu[fnd].selected = false
platform.window:invalidate()
end
function on.enterKey() --enter key was pressed
menu[findCurSelection()].text = "You pressed Enter"
platform.window:invalidate()
end
function findCurSelection() --find the current selected item
for i = 1, table.maxn(menu) do
if menu[i].selected then
return i
end
end
end
since this is a very basic outline, you could do alot with it.
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that's nice jwalker, but i think it's a bit difficult, he just started...
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It is, but he can use it as a reference once he learns more about how to program.
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This is basically the menu I used in my first few games. You can change it to to be more flexible, and use objects (I don't think you know that yet.)
--Menu
function on.paint(gc)
if not init then
x = 25
y = 65
val = 1
end
gc:drawString("Option 1",40,60,"top")
gc:drawString("Option 2",40,75,"top")
gc:drawString("Option 3",40,90,"top")
gc:drawString("Option 4",40,105,"top")
gc:fillRect(x,y,10,10)
end
function on.arrowKey(dir)
--Moves the cursor
if dir == "up" then
y = y - 15
val = val - 1
elseif dir == "down" then
y = y + 15
val = val + 1
end
--Wrap around
if val == 0 then
y = 110
val = 4
elseif val == 5 then
y = 65
val = 1
end
platform.window:invalidate()
end
function on.enterKey()
if val == "whatever you want" then
"DO THIS"
elseif val == "this option" then
"DO THIS"
end
platform.window:invalidate()
end