Hello!  I've been searching everywhere for this (including this forum) and haven't been able to figure it out.  I'm attempting to use [W][A][S][D] and [SHIFT] to steer a square around the screen, but I can't seem to figure out the shift part.  It should essentially steer in the standard holonomic FPS style, but I'm having problems.  The [SHIFT] key should toggle the variable which corresponds to the "speed".  I don't currently have access to the modified version, but I can assure you it didn't work.  This is what I've been trying to modify.

1. import processing.core.*;
   
   public class Key_WASD extends PApplet {
       public static void main(String args[]) {
           PApplet.main(new String[] { "--present", "Key_WASD" }); 
       }
   
       final static int NORTH = 1;
       final static int EAST = 2;
       final static int SOUTH = 4;
       final static int WEST = 8;
       int result;
       float x,y,a;
        
       public void setup() {
         size(displayWidth,displayHeight);
         frameRate(300);
         noCursor();
         result = 0;
         x = width/2;
         y = height/2;
         a = 3;
       }
        
       public void draw() {
         background(0);
         switch(result) {
           case NORTH: y-=a; break;
           case EAST: x+=a; break;
           case SOUTH: y+=a; break;
           case WEST: x-=a; break;
           case NORTH|EAST: y-=a; x+=a; break;
           case NORTH|WEST: y-=a; x-=a; break;
           case SOUTH|EAST: y+=a; x+=a; break;
           case SOUTH|WEST: y+=a; x-=a; break;
           case NORTH|SOUTH|EAST: x+=a; break;
           case NORTH|SOUTH|WEST: x-=a; break;
           case EAST|WEST|NORTH: y-=a; break;
           case EAST|WEST|SOUTH: y+=a; break;
         }
        
         if (x>displayWidth){x=0;}
         if (x<0){x=displayWidth;}
         if (y>displayHeight){y=0;}
         if (y<0){y=displayHeight;}
        
         fill(255);
         rect(x,y,10,10);
       }
        
       public void keyPressed(){
         switch(key) {
           case('w'):case('W'):result |=NORTH;break;
           case('d'):case('D'):result |=EAST;break;
           case('s'):case('S'):result |=SOUTH;break;
           case('a'):case('A'):result |=WEST;break;
         }
        
       }
        
       public void keyReleased(){ 
         switch(key) {
           case('w'):case('W'):result ^=NORTH;break;
           case('d'):case('D'):result ^=EAST;break;
           case('s'):case('S'):result ^=SOUTH;break;
           case('a'):case('A'):result ^=WEST;break;
         }
       }
   }

  A friend of mine (who is notoriously good at processing) tried this himself, but still had issues.  The [SHIFT] key has to be pressed before moving, and can not be toggled on while moving.  Here's that code (he told me to put it here).

1. import processing.core.PApplet;
   import processing.core.PVector;
   
   public class Key_WASDShift extends PApplet {
       public static void main(String args[]) {
           PApplet.main(new String[] { "--present", "Key_WASDShift" }); 
       }
      
       boolean left;
       boolean right;
       boolean down;
       boolean up;
       boolean SOOPASPEED;
   
       PVector pos = new PVector(500, 300);
   
       public void setup() {
         size(displayWidth, displayHeight);
         frameRate(60);
       }
   
       public void draw() {
         if (left) {
           if (SOOPASPEED) {
             pos.x -= 5;
           }
           else {
             pos.x -= 3;
           }
         }
         if (right) {
           if (SOOPASPEED) {
             pos.x += 5;
           }
           else {
             pos.x += 3;
           }
         }
         if (down) {
           if (SOOPASPEED) {
             pos.y += 5;
           }
           else {
             pos.y += 3;
           }
         }
         if (up) {
           if (SOOPASPEED) {
             pos.y -= 5;
           }
           else {
             pos.y -= 3;
           }
         }
        
         stroke(255);
         fill(255);
         background(0);
         rectMode(CENTER);
         rect(pos.x, pos.y, 10, 10);
       }
   
       public void keyPressed() {
         if (key == 'a') {
           left = true;
           SOOPASPEED = false;
         }
         else if (key == 'A') {
           left = true;
           SOOPASPEED = true;
         }
         if (key == 'd') {
           right = true;
           SOOPASPEED = false;
         }
         else if (key == 'D') {
           right = true;
           SOOPASPEED = true;
         }
         if (key == 's') {
           down = true;
           SOOPASPEED = false;
         }
         else if (key == 'S') {
           down = true;
           SOOPASPEED = true;
         }
         if (key == 'w') {
           up = true;
           SOOPASPEED = false;
         }
         else if (key == 'W') {
           up = true;
           SOOPASPEED = true;
         }
       }
   
       public void keyReleased() {
         if (key == 'a' || key == 'A') {
           left = false;
         }
         if (key == 'd' || key == 'D') {
           right = false;
         }
         if (key == 's' || key == 'S') {
           down = false;
         }
         if (key == 'w' || key == 'W') {
           up = false;
         }
       }
   }

I apologize if I forgot anything.  Also, if it wasn't apparent, we're both using Eclipse for compiling, which isn't our problem.  Can anyone see what we're doing wrong?  Thanks!