okay im newish to codea and i have been posting all these little things that i need help with in separate sections, instead ill post everything here
heres my first problem i am messing around with. I think i know whats wrong but i dont know how to fix it
if lives <= 15 then
m = sprite"Space Art:Red Ship Damaged"
else
m = “Space Art:Red Ship”
sprite(m)
that works, however when testing, the health gets down to 15, it changes sprite but then things disappear, i think the new sprite covers up all the text i had, aswell as the bullets shot out from the ship… anyone know how to fix it?
@OwenClaxton One thing you might want to change: the second if statement. Right now, the first one is checking if lives is less than or equal to 15. The second is checking if lives is greater than or equal to 15. If lives is 15, both if statements are true, and the one last defined will be the one that works. Both if statements say, as a second question, that the code inside it gets fired also if lives is 15, as the = part in <= or >= says.
All of that could be avoided, too, if you used an else. If then else end. Like this:
function setup() -- This is the beginning of the function named setup, which is ran at the start of the program.
local b = true -- Create a "local" variable of the name b, with a boolean (fancy word for true/false) value of true. "local" means that this variable cannot be used in any other function than setup, and is useful for temporary variables.
if b then -- If b is true, run this code:
print("b is true!") -- Simply prints "b is true!" in the output.
else -- The if statement failed, meaning b is false. So we run this code instead:
print("b is false!") -- Simply prints "b is false!" in the output.
end
-- Since we defined "b" manually, not from user input, and we set it to true, "b" will always be true. If you want a different outcome, change the "b = true" part to "b = false"
end -- This means that we are done writing the code in setup, and after this, we could make, say, a function named draw, which is called every frame to put pictures on the screen.
If your numbers are just in order like 1,2,3,4,5, etc. then you can use this.
function setup()
number = math.random(5)
end
function draw()
if number == 1 then
print("Did you hear of the guy who got hit with a can of soda? at least it was a soft drink.")
elseif number == 2 then
print("I'm reading a book about anti-gravity, its hard to put down.")
end
end
But if your numbers are like 1, 4, 8, 11, 23, etc. then use:
function setup()
numbers = {1,4,8,11,23} -- Put all your numbers in a table
number = numbers[math.random(#numbers)] -- Set the number value to one of our numbers.
end
function draw()
if number == 11 then
print("No puns this time, just an inspirational quote")
elseif number == 23 then
print("Don't judge each day by the harvest you reap but by the seeds that you plant")
end
end
@OwenClaxton Depends really, in your case, if you have only two numbers then you can use else, but if you have five different numbers then you don’t want every single one to pass the “else” test would you?
function setup()
number = 1 -- Change this to get a different outcome
if number == 1 then -- Is the number equal to 1?
print("The number is 1!")
elseif number == 2 then -- The number isn't 1, as the above if failed. Is it 2?
print("The number is 2!")
elseif number == 3 then -- The number isn't 2 either, so we check if it's 3.
print("The number is 3!")
else -- It's not 1, 2, or 3. So we run this:
print("The number is not 1, 2, or 3!")
end
end
You don’t have to have the else at the end, either.
Elseifs are just a compacted version of:
if a then
-- Blah 1
else
if b then
-- Blah 2
else
if c then
-- Blah 3
end
end
end
@Owen, you’re not taking any trouble to look for things before asking other people to give you answers.
Your questions on if tests and random numbers could be answered very quickly by just googling “random number Lua” for example, or looking at the Lua section of the help built into Codea. I do that myself all the time. And you can search the forum for things like menus.
While other users are happy to help, it should not be with basic stuff you can’t be bothered to look up for yourself. So please look before you ask. If you can’t find it and there is no tutorial on it, that is the time to ask.
First download the dependency code into its own project on your iPad
Then go to the project where you want to use it, and in the code editor, press the plus symbol at upper right. Find the dependency project on the list and touch it so it is ticked.
Now you can use that code as though it was in your project
