Adding values to a 2 dimensional array in processing

Programming Questions

jmtaylor91

Adding values to a 2 dimensional array in processing

in Programming Questions • 1 year ago

I'm trying to using a for loop to add x and y coordinates to a two dimensional array but I'm struggling to work out the syntax to use to do it. My code is below:

void draw()
{
for (int i=0; i<(camWidth*camHeight); i++)
{
cam8Strolz = loadImage("http://88.116.117.219/axis-cgi/jpg/image.cgi?resolution=640x480", "jpg");
int x = int(random(camWidth));
int y = int(random(camHeight));
int loc = x + y*camWidth;
cam8Strolz.loadPixels();
float r = red(cam8Strolz.pixels[loc]);
float g = green(cam8Strolz.pixels[loc]);
float b = blue(cam8Strolz.pixels[loc]);
noStroke();
fill(r,g,b,100);
ellipse(x,y,blurSize,blurSize);
ellipseArray[i][i] = x; y;
}
}

Its the last line that I need the syntax for really. I'm struggling!

Thanks in adance

Replies(6)

preeejin

Re: Adding values to a 2 dimensional array in processing

1 year ago

Make two lines out of it:

ellipseArray[i][i] = x;
ellipseArray[i][i] = y;

Problem is you will have overwritten it. I suggest you do something like this:

ellipseArray[i][1] = x;
ellipseArray[i][2] = y;

jmtaylor91

Re: Adding values to a 2 dimensional array in processing

1 year ago

Would that not just change the second dimension of the array and leave the first blank?

I want the x coordinates in one and the y coordinates in the other.

Would it maybe be easier to have 2 separate arrays?

lasko25

Re: Adding values to a 2 dimensional array in processing

1 year ago

I am also wondering how to do this.

PhiLho

Re: Re: Adding values to a 2 dimensional array in processing

1 year ago

How to do what?

teddybot

Re: Adding values to a 2 dimensional array in processing

1 year ago

This may need to be before the loop not in it:
cam8Strolz = loadImage("http://88.116.117.219/axis-cgi/jpg/image.cgi?resolution=640x480", "jpg");
cam8Strolz.loadPixels();

If you are trying to redraw the image later from an array store the colors for each x/y:
ellipseArray[x][y][0] = r;
ellipseArray[x][y][1] = g;
ellipseArray[x][y][2] = b;

Later you can go through them all and redraw it:
for x = 0 to width-1
for y = 0 to height-1
{
fill(ellipseArray[x][y][0] ,ellipseArray[x][y][1] ,ellipseArray[x][y][2] )
ellipse(x,y,2,2,opacity?)
}

To randomize the redrawing:
for x = 0 to width-1
for y = 0 to height-1
{
if (random 1 in 5) fill(ellipseArray[random x][random y][0],...[1],...[2])
fill(ellipseArray[x][y][0] ,ellipseArray[x][y][1] ,ellipseArray[x][y][2] )
ellipse(x,y,2,2,opacity?)
}

To convert i to x,y

x = i mod camwidth;
y = int(i/camheight)

Coordinates in a two dimensional array are usually represented with:
coordinate[0][0] = x;
coordinate[0][1] = y;
One Dimension, Two Dimensions
http://www.theproblemsite.com/programming/one_dimension.asp

int x = int(random(camWidth));
int y = int(random(camHeight));
int loc = x + y*camWidth;

looks like it is randomizing the pixels which will lose some from the original.
if this is not the desire you can store it in an array then do a loop from beginning to the end of the pixels and swap each ones color with another ones color.

It may do what you are looking for to read in the pixel array, run a swap on the pixels, the loop the pixel array and draw ellipses of a certain size and opacity.

sansumbre..

Re: Adding values to a 2 dimensional array in processing

1 year ago

Time to use PVector. Or create your own data type and keep an array of it.

PVector ellipses[];

...

ellipses[i].x = x;

ellipses[i].y = y;

ellipses[i].z = z;

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