for (int p : img.pixels)

Programming Questions

pacoruizg..

in Programming Questions • 1 year ago

Hi, I've seen this line: for(int p: img.pixels) in a code. I´ve never seen this kind of for before. I´ve always seen the for (;;) kind. It seems p takes all the picture's pixels values, but I would like to see in general the way of using this for(:) structure

PImage picture;
Integer[] palette;
void setup(){
size(466, 520);
background(0);
picture = loadImage("kadinsky.jpeg");
image(picture,0,0);
palette = getPalette(picture);
for(int i = 0; i < palette.length; i++){
set(i % width, 330 + (i / width), palette[i]);
}
fill(255);
text("Number of pixels in image = " + picture.width * picture.height, 10, height - 40);
text("Number of unique colours = " + palette.length, 10, height - 20);
}
Integer[] getPalette(PImage img){
HashSet<Integer> colours = new HashSet<Integer>();
img.loadPixels();
for(int p : img.pixels){
colours.add(new Integer(p));
}
Integer[] p = colours.toArray(new Integer[colours.size()]);
Arrays.sort(p);
return p;
}