Help Programming

mat88 · Mar 4, 2008

Hi,
I'm trying to program the scrolling of a background (NDS) and it's working. The only problem is, when I continu to press on the left et we are at the limit, the background stop (ok) but the value of scrolling continu to decrease (not ok). I tryed put a condition if to bloc the value to zero but it didn't work.

there is a part of the code

CODEÂÂÂÂscrollx += (Pad.Held.Right - Pad.Held.Left);
ÂÂÂÂscrolly += (Pad.Held.Down - Pad.Held.Up);
ÂÂÂÂif(scrollx

CockroachMan · Mar 4, 2008

How do you know that the values are decreasing? Are you using something to print the values for you?

Anyway.. are you using unsigned variables? That can lead to overflow and keep your variables always positive..

mat88 · Mar 4, 2008

I use u32 scrolly, scrollx
Yes I have a debug function that print it.

Code:

ÂÂÂÂPA_InitText(0,2);
ÂÂÂÂPA_OutputText(0,1,6,"Position: (x=%d;y=%d)",scrollx,scrolly);

Between I use PAlib to code on DS

CockroachMan · Mar 4, 2008

mat88 said:
I use u32 scrolly, scrollx

Here's your problem.. those are unsigned numbers.. they are only positives.. try using int instead of u32

mat88 · Mar 4, 2008

oh thanx!! It's working fine whit int instead of unsigned

(what a newbie i'm I!)

mat88 · Mar 4, 2008

I have an other problem

I need help with a table of string
CODE#include or? #include
int main(int argc, char ** argv)
{
string city[10]={"Ville départ","Port1"}; or? std::string city[10]={"Ville départ","Port1"};
}
I'm using Devkitpro whit PAlib (using the build.exe)

CockroachMan · Mar 4, 2008

You can use

CODE#include
using namespace std;
int main(int argc, char ** argv)
{
string city[10]={"Ville départ","Port1"};
}

or

CODE#include
int main(int argc, char ** argv)
{
std::string city[10]={"Ville départ","Port1"};
}

same result..

Mangofett · Mar 4, 2008

And while we're on discussion of PAlib, how would I go about assigning array values to sprites? like if I have something like arrayx[10] and araayy[7], and I have an actual grid with sprites on screen.

CockroachMan · Mar 4, 2008

I don't understand your problem linki

Wouldn't be easier to use arrayxy[10][7] instead of arrayx[10] and arrayy[7] ?

mat88 · Mar 4, 2008

thank you, it's working now!

but my next problem is coming.
Is it possible to have 2 PA_InitText? (in different function)

like

Code:

function1()
{PA_InitText(0,2);}
function2()
{PA_InitText(1,2);}

int main()
{
while(1)
{
function1();
function2();
}
}

CockroachMan · Mar 4, 2008

Never used PAlib.. can't help you with that :/

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