You cal also do that, if you want the text to appear/disappear when pressing enter multiple times :

enterHasBeenPressed = false --initializes enterHasBeenPressed to be false
function on.paint(gc)
if enterHasBeenPressed then --execute the following code if enterHasBeenPressed is true
gc:drawString("Hello World", 0, 0, "top")
end
end
function on.enterKey()
enterHasBeenPressed = not enterHasBeenPressed -- will become true if false and false if true (switch state)
platform.window:invalidate()         --invalidates the window (basically, on.paint will be called)
end


No problem

As far as I'm aware, commands that are usable by functions can be accessed using math.eval() but commands like Request and Text are only available in programs.

Visit http://ourl.ca/12647 for more information.

An example of the usage of math.eval is located here: http://www.inspired-lua.org/2011/08/save-a-high-score-without-cheating-possibility/

Code: [Select]

math.eval(math_expression)This function sends an expression or command to the Nspire math server for evaluation. The input expression must be a string that the Nspire math server can interpret and evaluate.
If the math server successfully evaluates the expression, it returns the numerical results. The eval function returns no result if the math server does not return a calculated result or if the calculated result cannot be represented as a fundamental Lua data type.
If the math server cannot evaluate the expression because of a syntax, simplification, or semantic error, eval returns two results: nil and an error number.

Ok, thank you 3rik and jimbauwens. So what you're telling me is that I can call virtually any basic function except the commands I want to... Right?

I'll take a look at Levak's Sudoku then we'll see if I can do it.

If you have the choice between fillRect, fillArc, or fillPolygon and drawImage, I'd go with the fill functions. Obviously if you want some intricate pattern on the screen it is ridiculous to put hundreds of fillRects but if it is something relatively simple then it is usually a good choice. Personally I've only noticed a speed difference when there's a lot of images being drawn, however, images take up a bunch of memory compared to fillRect.

If you want to just draw a simple chess board you could do something like this:

function on.paint(gc)
gc:setColorRGB(0, 0, 0)
draw = false
for column=1, 8 do
draw = not draw
for row=1, 8 do
draw = not draw
if draw then
gc:fillRect(column * 25 - 19, row * 25 - 19, 25, 25)
end
end
end
gc:drawRect(5, 5, 201, 201)
end

I'm not sure if I answered your question but I hope this helps.

Can LÖVE be used on the Nspire?

This may have been mentioned before, but is it possible to do anything similar to Request and RequestStr in TI-nspire Basic on Lua?
I want the user to be able to input a few numbers, and see what number they are typing I guess.

If not I can work around with pressing "up" and "down" buttons to change these numbers in the program, but I'll just have to change the programming around a bit.

Ok I have an idea to just capture certain characters the user types and display them separately but concatenated as a single string.
EDIT: Oh yes that's what I was looking for thanks cyano.