1. PFont myFont;
2. String letters="";
3. 
   
4. void setup() {
5.   size (330, 760);
6.   myFont = createFont("Courier New", 85);
7.   textFont(myFont);
8. }
9. 
   
10. void draw() {
11.   background(0);
12.   int x=0, y=0;
13.   for ( int i=0; i < letters.length(); i++ ) {
14.     text( letters.charAt(i), 80 + 60 * x, 70 + 60 * y );
15.     x++;
16.     if ( x == 3) {
17.       y++;
18.       x=0;
19.     }
20.   }
21. }
22. 
    
23. void keyPressed() {
24.   if ( (key >= 'A' && key <= 'z') || (key == ' ') || (key >= '0' && key <= '9') ) {
25.     if ( letters.length() < 36 ) {
26.       letters+=key;
27.     }
28.   }
29.   if( key == BACKSPACE || key == DELETE ){
30.     if( letters.length() > 0 ){
31.       letters = letters.substring(0, letters.length()-1);
32.     }
33.   }
34.   if( key == ENTER || key == RETURN ){
35.     println( letters );
36.     letters = "";
37.   }
38. }

               

                
// 2D Array of objects
                
Cell[][] grid;
                


                
// Number of columns and rows in the grid
                
int cols = 10;
                
int rows = 10;
                


                
void setup() {
                
 size(200,200);
                
 grid = new Cell[cols][rows];
                
 for (int i = 0; i < cols; i++) {
                
 for (int j = 0; j < rows; j++) {
                
 // Initialize each object
                
 grid[i][j] = new Cell(i*20,j*20,20,20,i+j);
                
 }
                
 }
                
}
                


                
void draw() {
                
 background(0);
                
 // 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 < rows; j++) {
                
 // Oscillate and display each object
                
 grid[i][j].oscillate();
                
 grid[i][j].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
                


                
 // Cell Constructor
                
 Cell(float tempX, float tempY, float tempW, float tempH, float tempAngle) {
                
 x = tempX;
                
 y = tempY;
                
 w = tempW;
                
 h = tempH;
                
 angle = tempAngle;
                
 } 
                
 
                
 // Oscillation means increase angle
                
 void oscillate() {
                
 angle += 0.02; 
                
 }
                


                
 void display() {
                
 stroke(255);
                
 // Color calculated using sine wave
                
 fill(127+127*sin(angle));
                
 rect(x,y,w,h); 
                
 }
                
}