Processing Forum

Using arrayCopy() to copy one line on two...?

[2 Replies]
- 22-Jul-2013 11:06 AM
- Forum: Programming Questions
Hello to all,

I am fairly new to processing and I need help... I am clearly missing something!

I have two text files. The first one contains numbers from one to ten and the second one numbers from eleven to twenty. I need to copy one line of data on two in a new text file. At the end, the data should be in this order :

[0] 1

[1] 12

[2] 3

[3] 14

...

Here is my code so far :

PrintWriter newTextFile;

void setup() {

String lines[] = loadStrings("data/i1.txt");

String lines2[] = loadStrings("data/i2.txt");

newTextFile = createWriter("result/allData.txt");

// for (int j = 0 ; j < lines.length; j+=2) {

arrayCopy(lines2, 1, lines, 1, 1);

saveStrings("result/allData.txt", lines);

println(lines);

//}

}

void draw() {

}

I thought a for loop would do the trick but I am unable to implement it properly.

Also, since there will be much more text files and numbers in the future, is it a good way to proceed? Or should I try something else?

Thanks for your help!

Load images with three digits filenames

[3 Replies]
- 09-Apr-2013 12:04 PM
- Forum: Programming Questions
Hi,

I want to do a project using more than a hundred of images.

Since I am fairly new to Processing, I started with an array of 10 images. I manually named the files as test_0.jpg, test_1.jpg, test_2.jpg... before I loaded the images with a for loop. And it worked! :

for ( int i = 0; i< allImages.length; i++ ) {

allImages[i]=loadImage( "test_" + i + ".jpg" );

println(i);

}

Then I tried to load 100 images. Indeed, I used a software (Adobe Bridge) to name the files this time.

test_0.jpg therefore became test_000.jpg

test_1.jpg became test_001.jpg

...

I think Processing does not consider 0 and 000 as being equivalent. And I am unable to figure out why...

Should I add something in the parenthesis?

All ideas welcomed!

Display one row of pixels out of two

[2 Replies]
- 05-Apr-2013 01:01 PM
- Forum: Programming Questions
Hi,

I loaded an image and was able to play with the location of its pixels(yeah!).

Now I would like to display only one row of pixels out of two.

Let's say I have :

1st row

2nd row

3rd row

4th row

5th row

...

It would become :

1st row

3rd row (instead of the second row)

5th row (instead of the fourth row)

...

I don't want any spaces between the rows, I really want the next line to replace the previous one.

I believe I have to play with the indexes in the array of pixels but I am not sure how... all ideas welcomed!

Here is what I have so far :

PImage img;

int loc;

void setup() {

size(504,360);

noStroke();

img = loadImage("test1parr.jpg");

image(img,0,0);

loadPixels();

for (int x = 0; x < width; x++) {

for (int y = 0; y < height; y+= 2) {

pixels[y*width+x] = loc;

}

}

updatePixels();

}

void draw() {

/*

for (int j = 0; j < pixels.length; j+= 503) {

for (int i = 0; i < pixels.length; i++) {

println("y equals "+ j + "x equals " + i);

}

}

*/

}

Make a still image from an array of pixels

[6 Replies]
- 02-Apr-2013 02:53 PM
- Forum: Programming Questions
Hello to all,

I am new to processing. I want to do a project using the pixels of a still image but I am so confused! :)

First, here's what I want to do :

1- Load the image (quite easy!)

2- Store all its pixels in an array (ex: [0] 156, [1] 157, [2] 158 ...)

3- Inverse the array (ex: [0] 158, [1] 157, [2] 156 ...)

4- Display the result (and save it as a .tif file)

I based the code on examples from the processing website and the forum.

I also used a few println to see what was going on.

I think steps 2-3 were successful as the array is filled by a proper number of index and values (extremely weird values though since I was unable to convert them into rgb).

Step 4 is however a disaster... How may I assemble an image from an array of pixels?

I played with createImage but I failed... what am I missing?

Thanks for the help and ideas!

Here is the code:

PImage img;

color [] imageColors;

boolean test = false;

String fileName = "parr1_final.tif";

void setup() {

size(504, 360);

img = loadImage( "test1parr.jpg");

image(img,0,0);

img.loadPixels();

imageColors = new color[img.pixels.length];



for (int x=0; x < img.width; x++) { // search each line and row of the image

for (int y=0; y < img.height; y++) {

int loc = x + y*img.width;

float r = red (img.pixels [loc]);

float g = green (img.pixels [loc]);

float b = blue (img.pixels [loc]);

imageColors[loc] = color(r, g, b);



}

}

println(imageColors);



test = true;



if (test) {

//println("true");

for(int i = 0; i < imageColors.length/2; i ++) { // reverse the array

int temp = imageColors[i];

imageColors[i] = imageColors[imageColors.length - i - 1];

imageColors[imageColors.length - i - 1] = temp;

}



img.updatePixels();

println(imageColors);

img.save(fileName);

}

}

void draw() {

}

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