processing starter

PImage aUp;  // up arrowPImage aLft;  // left arrowPImage aDwn;  // down arrowPImage aRt;  // right arrow//WHITE VERSIONSPImage aUpW;  // up arrowPImage aLftW;  // left arrowPImage aDwnW;  // down arrowPImage aRtW;  // right arrowint y;int [] _chordCoords = new int[5];PImage [] _images = new PImage[4];PImage Up;PImage Dwn;PImage Lft;PImage Rt;PImage blank;int curImageIndex;int hit = 0;int miss = 0;void setup() {  size(600, 600);  background(0);  frameRate(30);    //inactive images  aUp = loadImage("images/upArrow.GIF");  aLft = loadImage("images/leftArrow.GIF");  aDwn = loadImage("images/downArrow.GIF");  aRt = loadImage("images/rightArrow.GIF");    blank = loadImage("images/blank.GIF");    //active images  aUpW = loadImage("images/upArrowWhite.GIF");  aLftW = loadImage("images/leftArrowWhite.GIF");  aDwnW = loadImage("images/downArrowWhite.GIF");  aRtW = loadImage("images/rightArrowWhite.GIF");      Up = aUp;  Dwn = aDwn;  Lft = aLft;  Rt = aRt;    setCurImageIndex();      position(Up, 1);  position(Lft, 2);  position(Dwn, 3);  position(Rt, 4);  }void position(PImage buttonImage, int xPlacement){     if(xPlacement <= 0 || xPlacement >= 5) {return;}  else if(xPlacement == 1) {   _chordCoords[1] = 0;   _images[0] = buttonImage;  }  else if(xPlacement == 2) {   _chordCoords[2] = width/4;  _images[1] = buttonImage;   }  else if(xPlacement == 3) {   _chordCoords[3] = width/2;    _images[2] = buttonImage;  }  else {   _chordCoords[4] = width-width/4;    _images[3] = buttonImage;  }}void setCurImageIndex(){    curImageIndex = int(random(3)+1);}void cycle(){    int speed = int(random(15,25));    if(y<600) {y+=speed;  } else {    y = -200;   setCurImageIndex(); }    _chordCoords[0] = y;  image(_images[curImageIndex-1],_chordCoords[curImageIndex],_chordCoords[0],width/4,height/4);//  println(curImageIndex-1);}void draw(){  background(0);  image(Up, 0, height-height/4, width/4, height/4);  image(Lft, width/4, height-height/4, width/4, height/4);  image(Dwn, width/2, height-height/4, width/4, height/4);  image(Rt, width-width/4, height-height/4, width/4, height/4);  fill(0,hit,0,hit);  rect(0,0,600,600);  fill(miss,0,0,miss);  rect(0,0,600,600);  cycle();}  void keyPressed() {  if(key == CODED){    if (keyCode == UP){      Up = aUpW;    } else if(keyCode == DOWN){      Dwn = aDwnW;    } else if(keyCode == LEFT) {      Lft = aLftW;    } else if(keyCode == RIGHT) {      Rt = aRtW;    } else {      Up = aUp;      Dwn = aDwn;      Lft = aLft;      Rt = aRt;    }  }    if(key == CODED){    if (keyCode == UP && curImageIndex-1 == 0 && y>=340 && y<=600){      hit=200;      println("hit!");    } else if(keyCode == LEFT && curImageIndex-1 == 1 && y>=340 && y<=600){      hit=200;      println("hit!");    } else if(keyCode == DOWN && curImageIndex-1 == 2 && y>=340 && y<=600) {      hit=200;      println("hit!");    } else if(keyCode == RIGHT && curImageIndex-1 == 3 && y>=340 && y<=600) {      hit=200;      println("hit!");    } else {      miss=200;      println("miss!");    }  }}void keyReleased() {  if(key == CODED){    if (keyCode == UP){      Up = aUp;    } else if(keyCode == DOWN){      Dwn = aDwn;    } else if(keyCode == LEFT) {      Lft = aLft;    } else if(keyCode == RIGHT) {      Rt = aRt;    } else {      Up = aUp;      Dwn = aDwn;      Lft = aLft;      Rt = aRt;    }  }      if(key == CODED){    if (keyCode == UP && curImageIndex-1 == 0 && y>=340 && y<=600){      hit=0;      miss=0;    } else if(keyCode == LEFT && curImageIndex-1 == 1 && y>=340 && y<=600){      hit=0;      miss=0;    } else if(keyCode == DOWN && curImageIndex-1 == 2 && y>=340 && y<=600) {      hit=0;      miss=0;    } else if(keyCode == RIGHT && curImageIndex-1 == 3 && y>=340 && y<=600) {      hit=0;      miss=0;    } else {      miss=0;    }  }}