How to load images using an arrayList?

Processing Beginners
2

Here is a way with ArrayList and then shuffling the thing - see function shuffle().

I also use a nested for loop that calculates the positions of the images in the grid - see function draw_grid(). That is more flexible than what you had in draw().

(code snippets from the forum)

Welcome to the forum, it’s a great community!

Chrisir


// https://discourse.processing.org/t/how-to-load-images-using-an-arraylist/15263

ArrayList<PImage> img = new ArrayList();

void setup() {
  //fullScreen();
  size(1200, 900);
  // load all 
  for (int i=0; i<9; i++) {
    img.add ( loadImage("img"+i+".jpg") );
  }
  // shuffle 
  // img=shuffle( img );
   
  background (0);
}

void draw() {
  background (0);
  draw_grid();

  fill(255);
  text("Hit Space Bar to shuffle", 
    13, height-20);
}

void draw_grid() {
  int x0 = 50, y0 = x0, // dist from border 
    w = 310, h = w,      // width and height of a cell / image 
    off = 0;                   // offset between images 
  
  int k=0; 
  // nested for loop makes for columns and rows 
  for (int i = 0; i < 3; i++)
    for (int j = 0; j < 3; j++) {
      // we calculate the position on the fly 
      image(img.get(k), 
        x0+i*(w+off), y0+j*(h+off));
      k++;
    }
}

// shuffle in-place
ArrayList<PImage> shuffle (ArrayList<PImage> arrL1) {
  for (int i=0; i<arrL1.size(); i++) {
    int randomPosition = int(random(arrL1.size()));
    // swap image at position i with image at position randomPosition
    PImage temp = arrL1.get(i);
    arrL1.set(i, arrL1.get(randomPosition));
    arrL1.set(randomPosition, temp);
  }
  return arrL1;
}

void keyPressed() {
  if (key == ' ') {
    // shuffle 
    img=shuffle( img );
  }
}
//
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