Hello everyone! I'm new new new to processing.

I am trying to write a program that blacks out an image as part of a shooter-type game. Kinda like block-out meets space invaders. The way I am doing this is trying to draw a black rectangle wherever the bullet hits.

I keep getting a weird ArrayOutOfBounds Exception problem ever since I started trying to code for the blackened-out rectangles... Maybe you could help?

Thanks in advance!!!

1. /*
     Bree Rubin's quarter of the destruction project.
     A lot of this code was helped by attending the workshop
     wit Ramsey and Eric on making Asteroids.
    
     --- got more help later *sigh*
   */
   
   //laser gun == RADICAL!!!
   float laserX, laserY, laserSpeed, startPoint;
   
   //shooter
   float zapX, zapY, zapSpeed;
   boolean zapVis;  //whether or not the zap exists
   
   //Key input
   int keyDownArraySize = 127;
   boolean[] keyDown = new boolean [keyDownArraySize]; //not 100% on this one
   
   //bgimg
   PImage zeImg;
   
   
   //grid sectors
   int sqWidth, sqHeight;
   
   //rows cols for grid
   int rows, cols;
   int i, g;
   
   //array visibility of blackbox
   boolean[][] sqVis = new boolean[rows][cols];
   int[][] sqAlpha = new int[rows][cols];
   
   
   ////////////////////////BEGIN SETUP --------------
   
   void setup(){
    // frameRate(20);
     size(1024 , 768);
     zeImg = loadImage("logo_bottomleft.jpg");
     smooth();
    
     rows = 12;
     cols = 12;
     sqWidth = width/cols;
     sqHeight = height/rows;
     initLaser();
     initZap ();
    
    
    
   }//end setup
   
   
   ////////////////////////BEGIN INITIALIZING STUFF-------
   
   
   
   void initLaser (){
    laserX = 0;
    laserY = 0;
    laserSpeed = 5;
    startPoint = height-100;
   }
   
   void initZap (){
     zapX = 0;
     zapY = 0;
     zapSpeed = 1;
     zapVis = false;
   }
   
   
   /////////////////////BEGIN DRAW LOOP ------
   
   void draw() {
     //background(0);
    
   
     image(zeImg, 0, 0);
     drawLaser();
     updateLaser();
     if (zapVis) {
       drawZap();
       updateZap();
     }
     inputHandler();
     hitDetect();
    
   
   }//end draw loop
   
   ////////////////////OBJECTS
   
   void drawLaser() {
     stroke(255);
     fill(0,255,0);
     pushMatrix();
     //christmas
     //height-200 should also be a variable like... bottomStart or something
     translate(laserX, startPoint);
     rect(0,0,60,10);
     popMatrix();  //end matrix
   } // end drawLaser
   
   void updateLaser() {
     if ( laserX+50 > width) {
       laserX = width-50;
     }
     if ( laserX < 0 ) {
       laserX = 0;
     }
   }// end updateLaser
   
   
   void drawZap() {
     noStroke();
     fill(random(0,255),random(0,255),random(0,255));
     pushMatrix();
     //christmas
     //make the 40 a variable, laserWidth, 30 is half what the width is right now
     translate(laserX+30, height-200);
     ellipse(0,zapY,10,50);
     popMatrix();  //end matrix
   } // end drawLaser
   
   
   void updateZap() {
     //christmas
     //zapx = laserX-50 didn't seem to do anything, deleted, it's been put into the translate()
     //of drawZap()
     //should prolly put the 10 as a zapSpeed variable
     zapY-=10;
    
     //christmas
     //it's doing something strange from the translation, i'm not sure why but it works
     //you will probably want to dbl check what it is later... zapY is 0 when it is fired
     //and goes negative, that's why it's -(height-200)
     if (zapY < -(height-200)) {
      zapVis = false;
     }
   }// end updatezap
   
   ////////////////////OBJECT BEHAVIORS
   
   
   void hitDetect (){
    
     for (int i=0; i<rows; i++){
       for (int g=0; g<cols; g++){
        sqVis[i][g] = false;
         if (zapX >= i && zapX <= (i+sqWidth) && zapY >=g && zapY <= (g+sqHeight)){
            sqVis[i][g] = true;
         }
   
         if (!sqVis[i][g]){
           println("FALSE");
          }
         else if (sqVis[i][g]){
           println("tru");
           rect(i,g,(i+sqWidth), (g+sqHeight));
           sqAlpha[i][g]--; //decreases alpha
           }
         println(g);
         println(i);
       }//end g for
     }//end i for
    
   
   }
   
   
   
   
   
   
   /////////////////////INPUT HANDLERS ETC
   
   void inputHandler() {
     // begin controlling my laserz
     //christmas
     //fixed your left right stuff
     if (keyDown[LEFT] || keyDown[37]) {
       laserX-=5;
     }
     if (keyDown[RIGHT] || keyDown[39]) {
       laserX+=5;
     } 
   
     //space is pressed to fire ze laserz!!!
     if (keyDown[32]) {
       if(!zapVis) {
         //christmas
         //it's not resetting the values of the bullet so i call initZap() here to clear
         //the previous bullet's coords
         //deleted the extraneous code
         initZap();
         zapVis = true;
       }
     }
   } //end inputHandler
   
   
   
   
   
   
   void keyPressed() {
   
     if(keyCode < keyDownArraySize) {
       keyDown[keyCode] = true;
     } //end if
   } //this function also allows for pressing TWO+ keys at once
   //so you can move and rotate at the same time!
   
   void keyReleased() {
   
     if(keyCode < keyDownArraySize) {
       keyDown[keyCode] = false;
     } //end if
   }