Appending more than one color to an array loop of colors

Processing Coding Questions
7

Ok so I slightly misunderstood, the nature of intList there I thought it worked exactly like an arrayList.

Cannot say why this won’t allow you to append twice, however could you use the following approach

for (int k = 0; k < cells.length*2; k++) {
    //inventory_1.set (k, lerpColor (from, to, k*step));
    if(k&2==0)inventory_1.append (lerpColor (from, to, k*step));
    else inventory_1.append (color (255));
    //inventory_1.append (color (0)); *** does not work when I add second color
  }

I might be misunderstanding what you are trying to achieve though.

Final check

Cell [] cells = new Cell[9];
IntList inventory_1;
void setup() {
  size (400, 600);
  color [] shuffledInventory = getColorListShuffled();

  int x = 0, y = x;
  int w = width, h = height/cells.length;

  for (int i = 0; i < cells.length; i++) {
    cells[i] = new Cell (x, y+i*h, w, h, shuffledInventory[i]);
  }
}
void draw() {
  background (51);

  for (int i = 0; i < cells.length; i++) {
    cells[i].display();
  }
  fill(0);
  text(inventory_1.size(),100,100);
}

color [] getColorListShuffled() {

  color from = color (random(255), random(255), random(255));
  color to = color (random(255), random(255), random(255));
  float step = 1.0f / (cells.length -2); // *** when I append second color I change to cells.length -3 
   inventory_1 = new IntList (0);


  for (int k = 0; k < cells.length; k++) {
    inventory_1.set (k, lerpColor (from, to, k*step));
    //inventory_1.append (lerpColor (from, to, k*step));
    inventory_1.append (color (255));
    inventory_1.append (color (0)); 
    inventory_1.append (color (0)); 
    //*** does not work when I add second color
  }
  inventory_1.shuffle();
  return inventory_1.array();
}
// CLASS ----------------------------------------------

class Cell {
  float x, y, w, h;
  color clr;
  
  Cell (float tempX, float tempY, float tempW, float tempH, color tempClr){
    
    x = tempX;
    y = tempY;
    w = tempW;
    h = tempH;
    clr = tempClr;
  }
  
  void display(){
    noStroke ();
    fill (clr);
    rect (x, y, w, h);
  }
}

This is what I get with three append cycles. The size of the list.size() is 3* bigger than cell.length - 1

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