// Practice with arrays

// myArray is an array of 20 ints
//int [] myArray = new int[20];

// Set a value using square brackets
//myArray[5] = 12;

//println(myArray[3]);

// Create arrays to hold shape values
int [] xCoords = {25, 30, 100, 317, 208};
int [] yCoords = {25, 150, 210, 102, 200};
int [] heights = {15, 50, 100, 25, 35};
int [] widths = {5, 10, 10, 5, 35};

void setup ()
{
  size(400, 300);
  background(20);
  fill(150, 240, 100);
  frameRate(10); // Slow down display
}

void draw ()
{
  background(20); // clear screen
  for (int i = 0; i < xCoords.length; i = i + 1)
  {
    rect(xCoords[i], yCoords[i], 
         widths[i], heights[i]);
    
    // Pick value between 0 and 20
    // - # = move left, + # = move right
    int xMoveAmount = (int)(random(50)) - 25;
    int yMoveAmount = (int)(random(50)) - 25;
    int heightChange = (int)(random(50)) - 25;
    int widthChange = (int)(random(50)) - 25;
    
    xCoords[i] = xCoords[i] + xMoveAmount;
    yCoords[i] = yCoords[i] + yMoveAmount;
    heights[i] = heights[i] + heightChange;
    widths[i] = widths[i] + widthChange;
  }
}