Hey guys! New to Processing and just implementing the basics.  This is actually for a project.  Nothing spectacular just, an array of colors that change in a loop.  The mouse when rolled over a coordinate in the array will reset the color to black.  Comments are welcome...go easy on me.  Processing is pretty neat.

1. /*
   *File: MyGrid
   *Author: Robert Castro
   *Date: 10/ 27 / 2010
   *Description: An array of changing colors.
   */
   
   Grid[][] myGrid;
   
   int cols = 15;
   int rows = 15;
   
   void setup() {
     size(cols * 20, rows * 20);
     myGrid = new Grid[cols][rows];
     for (int i = 0; i < cols; i++) {
       for (int j = 0; j < rows; j++) {
         myGrid[i][j] = new Grid(i*20, j*20, 20, 20, i+j, (int)random(0,255), (int)random(0,255));
       }
     }
   }
   
   
   void draw() {
     background(0);
     for (int i = 0; i < cols; i++) {
       for (int j = 0; j < rows; j++) {
          myGrid[i][j].changeColor();
         myGrid[i][j].display();
       }
     }
    
     int mx = mouseX/20;
     int my = mouseY/20;
    
   
     myGrid[mx][my].run();
     if ((mx + 1) < cols) {
         myGrid[mx + 1][my].run();
     }else {
         myGrid[0][my].run();
     }
    
     if ((mx - 1) >= 0) {
         myGrid[mx - 1][my].run();
     }else {
         myGrid[cols-1][my].run();
     }
    
     if ((my + 1) < rows) {
         myGrid[mx][my + 1].run();
     }else {
         myGrid[mx][0].run();
     }
    
     if ((my - 1) >= 0) {
         myGrid[mx][my - 1].run();
     }else {
         myGrid[mx][rows-1].run();
     }
   }
   
   class Grid {
     float x, y;
     float w, h;
     int col1;
     int col2;
     int col3;
    
     Grid(float tempx, float tempy, float tempw, float temph, int tempc1, int tempc2, int tempc3) {
       x = tempx;
       y = tempy;
       w = tempw;
       h = temph;
       col1 = tempc1;
       col2 = tempc2;
       col3 = tempc3;
     }
    
     void changeColor() {
       col1 += 1;
       col2 -= col1;
       col3 = col1 + col2;
      
       if (col1 > 255) {
         col1 = 0;
       }if (col2 < 0) {
         col2 = 255;
       }if (col3 > 255) {
         col3 = 0;
       }
     }
    
     void run() {
       col1 = 0;
       col2 = 0;
       col3 = 0;
     }
    
     void display() {
       color myColor = color(col1,col2, col3);
       stroke(255, 100);
       fill(myColor);
       rect(x,y,w,h);
     }
   }

Robert Castro

[Moderator's note: moved from General Discussion to Exhibition]