Hello!

I've created a sketch that selects a screen amongst several ones when the mouse is pressed. When ScreenA is selected, it should display Rain made of several Drops. But I don't succeed to make each Drop behave independantly. I would like that at a certain height y2, the Drop changes its transparency alphaDrop and at another height y2, reinitialize itself and appears to another place. Currently, when an height y2 is attained, every drops change their alpha, and then every drops are reinitialized together.
I've tryed to use this example http://wiki.processing.org/w/From_several_arrays_to_classes but obviously I'm doing something wrong.

Thanks for your help!
Laura

1. Screen[]     screens;
   int          NUMBER_SCREENS = 2;
   int          lastScreen, currentScreen;
   
   void setup()
   {
     size(768,768,P2D);
     smooth();
     background(0);
    
     screens = new  Screen[NUMBER_SCREENS];
     screens[0] = new ScreenA();
     screens[1] = new ScreenB();
    
     currentScreen = 0;
     screens[currentScreen].init();
   
   }
   
   void draw()
   {
       rect(100,100,100,100);
       //display current visual
       screens[currentScreen].display();
   }
   
   
   void mousePressed() {
   {
     // pick a different visual
     lastScreen=currentScreen;
     currentScreen=int(random(screens.length-1));
     if( lastScreen <= currentScreen )
       currentScreen=(currentScreen+1)%screens.length;
   }
   
   // The init function contains the parameters of the clear selected screen
   // So call it allows to restart the screen from 0 next time it appears
   screens[currentScreen].init();
   }
2. class Screen
   {
     Screen()
     {
     }
    
     void init()
     {
   
     }
    
     void display()
     {
     }
    
     void update()
     {
     }
   }
   
   
   
3. final int DROP_NB = 2;
   Drop[] dropArray = new Drop[DROP_NB];
   color[] colourArray = {color(26,200,214),color(154,214,226)};
   boolean val = false;
   
   class ScreenA extends Screen
   {
    
    ScreenA()
    {
    }
    
    void init()
    {
      noStroke();
      for (int i = 0; i<DROP_NB; i++)
      {
        dropArray[i] = new Drop(int(random(0,width)),int(random(-100,0)),colourArray[(int) random(colourArray.length)]);
        dropArray[i].init();
      }
    }
    
    void display()
    {
      background(#0AA08A);
     
      for (int i = 0; i<DROP_NB; i++)
      {
        boolean t = dropArray[i].rebirth(val);
        if (t == true)
        {
          blop();
          init();
        }
        dropArray[i].update();
        dropArray[i].show(); 
        dropArray[i].setSpeed(mouseY/10);
      }
    }
   }
   
   void blop()
   {
     fill(255,0,0);
     rect(100,100,100,100);
   }
4. class Drop
   {
     int      x1;
     int      y1;
     int      x2;
     int      y2;
     int      speed;
     color    c;
     int      alphaDrop;
    
     Drop(int x1, int y1, color c)
     {
       this.x1  = x1;
       this.y1  = y1;
       this.c   = c;
     }
    
     void init()
     {
       x2       = 20;
       y2       = 20;
       speed    = 1;
       alphaDrop= 255;
     }
    
     void show()
     {
       //if (y2<=height)
       //{
         //println(y2);
         fill(c, alphaDrop);
         ellipse(x1, y1, x2, y2);
       /*}else
       {
         init();
       }*/
     }
    
     void update()
     {
       y2 = y2 + 1 * speed;
       if (y2 >=200)
       {
         alphaDrop = 80;
       }
       else
       {
         alphaDrop = 255;
       }
     }
    
     boolean rebirth(boolean dropCreation)
     {
       if (y2>=height/2)
       {
         dropCreation = true;
       }
       return dropCreation;
     }   
    
     void setSpeed(int speedRate)
     {
       speed = speedRate;
     } 
   
   }
5. class ScreenB extends Screen
   {
    
    ScreenB()
    {
    }
    
    void init()
    {
    }
    
    void display()
    {
      background(#EAD211);
    }
   }
   
   

Hello!

I am relatively new to Processing, and I am trying to connect Processing and Arduino with Firmata.
I am using the 32 bit version of Processing and Java (a previous problem with Firmata forced me to).

Now, when I try to run one of the 3 examples given with the library, such as the arduino_pwm example, I get this error:
illegalAccessError: tried to access class processing.core.PApplet$RegisteredMethods from class cc.arduino.Arduino$SerialProxy

Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7
Exception in thread "Animation Thread" java.lang.IllegalAccessError: tried to access class processing.core.PApplet$RegisteredMethods from class cc.arduino.Arduino$SerialProxy
    at cc.arduino.Arduino$SerialProxy.<init>(Arduino.java:119)
    at cc.arduino.Arduino.<init>(Arduino.java:168)
    at arduino_pwm.setup(arduino_pwm.java:32)
    at processing.core.PApplet.handleDraw(PApplet.java:2103)
    at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:190)
    at processing.core.PApplet.run(PApplet.java:2006)
    at java.lang.Thread.run(Thread.java:662)

Here is the code:

1. import processing.serial.*;
   
   import cc.arduino.*;
   
   Arduino arduino;
   
   void setup() {
     size(512, 200);
     arduino = new Arduino(this, Arduino.list()[0], 57600);
   }
   
   void draw() {
     background(constrain(mouseX / 2, 0, 255));
     arduino.analogWrite(9, constrain(mouseX / 2, 0, 255));
     arduino.analogWrite(11, constrain(255 - mouseX / 2, 0, 255));
   }

Apparently the error is situated on this line: arduino = new Arduino(this, Arduino.list()[0], 57600);

Any idea?
Thanks!