2d-array.pde

// 2D Array of objects
System sys;

// Number of columns and cols in the grid
// cols need to > 35 to support the gun test
int cols = 50;

void setup() {
  size(400, 400);
  sys = new System(cols, 400 / cols);
}

void draw() {
  background(0);
  sys.display();
}


// A Cell object
class Cell {
  // A cell object knows about its location in the grid as well as its size with the variables x,y,w,h.
  float x,y;   // x,y location
  float w,h;   // width and height
  float angle; // angle for oscillating brightness
  color cor;

  // Cell Constructor
  Cell(float tempX, float tempY, float tempW, float tempH, color tempCor) {
    x = tempX;
    y = tempY;
    w = tempW;
    h = tempH;
    cor = tempCor;
  }

  void display() {
    stroke(255);
    // Color calculated using sine wave
    fill(cor);
    rect(x,y,w,h); 
  }
}

class System {
  Cell[][] grid;
  int cols;
  
  System(int tempCols, int size) {
    color[] colors = new color[3];
    colors[0] = color(255, 0, 0);
    colors[1] = color(0, 255, 0);
    colors[2] = color(0, 0, 255);
    
    cols = tempCols;
    grid = new Cell[cols][cols];
    for (int i = 0; i < cols; i++) {
      for (int j = 0; j < cols; j++) {
        // Initialize each object
        grid[i][j] = new Cell(i*size,j*size,size,size,colors[int(random(0, 3))]);
      }
    }
  }
  
  void display() {
    // The counter variables i and j are also the column and row numbers and 
    // are used as arguments to the constructor for each object in the grid.  
    for (int i = 0; i < cols; i++) {
      for (int j = 0; j < cols; j++) {
        grid[i][j].display();
      }
    }
  }
}