I'm having a problem figuring out how to make an array:

---------------
int h = 400;
int w = 400;

void setup() {
 size ( h,w);
 background ( 250, 250, 205);
 stroke( 100, 203, 12 );
}

/*
float[] points = new float[10];  
for ( int i = 0; i < 10; i++ ) {
  points[i] = i * 3;
}
*/
int i;
 
void draw() {
 for ( i = 0; i < 10; i++ ) {
//  ellipse(points[i], 104, 4, 4);      
   ellipse( i * 9, 55, 23, 43); // testing
 }
}
----

I added the single ellipse line to make sure that I was actually getting something in the draw loop.

Take out the commented sections, which are supposed to create an array, and then draw some ellipses based on that array.

I'm using 135, and I don't get any errors, but I don't get any ellipses either! What am I doing wrong?

CongoZombie wrote on Aug 2^nd, 2008, 3:35am:


Okay, I try this:
---------------------------------
int h = 400;
int w = 400;

void setup() {
 size ( h,w);
 background ( 250, 250, 205);
 stroke( 100, 203, 12 );
 
 float[] points = new float[10];  
 for ( int i = 0; i < 10; i++ ) {
   points[i] = i * 3;
 }

}
 
void draw() {
 
 for ( i = 0; i < 10; i++ ) {
//  ellipse(points[i], 104, 4, 4);  
   ellipse( i * 9, 55, 23, 43); // testing
 }
}
------------------------------

And I get the error
Semantic Error: No accessible field named "i" was found in type "Temporary_856_5281".

I heard somewhere along the line that anything created in setup is not available later on. That seems to be true, since I set i in the setup, and the error gets thrown in the draw() loop.

So, I apparently can't create an array in setup() that I would want to use in draw(), because it gets destroyed. However, I don't want to create it in draw(), because I'm looping, and I only want to create the array once, and I *do* eventually want to use the looping feature of draw().

So the only logical place to put the creation of the array would be outside of both setup() and loop(), AFAICT.

Thanks, John G!

Now, I'm having problems with the 2D array.

------
 int iterations = 100;
 
 points = new float[iterations + 1][2];
-------

Gives the error
emantic Error: The type of the right sub-expression, "float[][]", is not assignable to the variable, of type "float[]".