I'm using surface.setResizable(true); to can adapt the size of my window, it runs perfectly. I'm asking if there is an way to catch this event when I change the size with my mouse. I need to change the size of my PGraphics inside my sketch. Is it possible ?

Question is as in title. I'm curious about how buttons are displayed but can't see anything in the code that hints why nothing is needed in the draw method.

Thanks, Jordan

In the initialization of the library class, I'm calling the registerMethod() which works: p.registerMethod("keyEvent", this);

but I can only compile successfully if I create a public function of keyEvent without any parameters inside:

public void keyEvent(){ p.println("test"); }

however when trying to run a sketch using the library in Processing, I get this error: "There is no public keyEvent() method in the class xyscope.XYscope"

If I try to include the KeyEvent parameter like I've read about, the library won't compile:

public void keyEvent(KeyEvent evt){ p.println("test"); }

The error I get while trying to compile is such:

102: error: cannot find symbol [javac] public void keyEvent(KeyEvent evt){ [javac] ^ [javac] symbol: class KeyEvent [javac] location: class XYscope

Any ideas out there what I might be doing wrong?

Kf

import processing.core.*;
import processing.event.*;

TestClass aux;

void setup() {
  size(640, 480);
  fill(150);
  aux=new TestClass(this);
}

void draw() {
  background(0);
  if (frameCount%90==0) { 
    println(aux); 
    fill(random(50, 200));
  }
}


public class TestClass {
  int mX, mY;
  PApplet p;

  TestClass(PApplet pa) {
    p=pa;
    registerMethod("draw", this);
    //registerMethod("keyPressed", this);
    registerMethod("keyEvent", this);
  }

  public void keyEvent(KeyEvent event) {
    print("KE now  --> ");

    if (!keyRepeatEnabled && event.isAutoRepeat()) return;

    keyEvent = event;
    char key2 = event.getKey();
    keyCode = event.getKeyCode();

    switch (event.getAction()) {
    case KeyEvent.PRESS:     
      this.keyPressed( key2);      
      break;
    case KeyEvent.RELEASE:      
      this.keyReleased( key2);
      break;
    case KeyEvent.TYPE:
      this.keyTyped( key2);
      break;
    }
  }

  public void keyPressed(char inkey) {
    println("KE pressed!"+inkey);
  }

  public void keyReleased(char inkey) {
    println("KE releasedd!"+inkey);
  }

  public void keyTyped(char inkey) {
    println("KE typed!"+inkey);
  }

  public void draw() {
    ellipse(width>>1, height>>1, width>>2, height>>2);
  }

  @Override
    String toString() {
    String ss="";
    ss+="Mouse pointer: \t" +mX+"\t"+mY+"\n";   
    return ss;
  }
}

context = new SimpleOpenNI(this);

I assume this is because PApplet has been jettisoned? Putting opengl as my renderer gave me a bit more verbose information. Not sure exactly where to file this issue, since the simpleopenni google code page is no longer active.

java.lang.RuntimeException: java.lang.NoSuchMethodError: processing.core.PApplet.registerDispose(Ljava/lang/Object;)V
    at processing.opengl.PSurfaceJOGL$2.run(PSurfaceJOGL.java:312)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoSuchMethodError: processing.core.PApplet.registerDispose(Ljava/lang/Object;)V
    at SimpleOpenNI.SimpleOpenNI.initEnv(SimpleOpenNI.java:383)
    at SimpleOpenNI.SimpleOpenNI.<init>(SimpleOpenNI.java:255)
    at kinectExample.setup(kinectExample.java:25)
    at processing.core.PApplet.handleDraw(PApplet.java:1958)
    at processing.opengl.PSurfaceJOGL$DrawListener.display(PSurfaceJOGL.java:566)
    at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:691)
    at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:673)
    at jogamp.opengl.GLAutoDrawableBase$2.run(GLAutoDrawableBase.java:442)
    at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1277)
    at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1131)
    at com.jogamp.newt.opengl.GLWindow.display(GLWindow.java:680)
    at com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:77)
    at com.jogamp.opengl.util.AnimatorBase.display(AnimatorBase.java:451)
    at com.jogamp.opengl.util.FPSAnimator$MainTask.run(FPSAnimator.java:178)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)

p5.registerMethod("mouseEvent", this);

However, it just doesn't work. I'm not receiving any acknowledge in my mouseEvent method.

I've read the documentation here and here, but I'm not quite understanding if this is registering a new something that will be emitted or if this is a listener (observer pattern). Because in p5 the doc says by example:

p5.prototype.registerMethod('remove', p5.prototype.doRemoveStuff);

... and prototype is for creating a new method (registerMethod in this case) and not to use one. Am i wrong? Anyway, tried also this and neither worked:

p5.__proto__.registerMethod("mouseEvent", this);

So, I just want to listen to events from a custom class. What am I missing? Any clue?

My code is:

import * as P5 from 'p5' // used to access library constants

export class ControlZone extends Panel {

    constructor(x, y, width, height) {
        super(x, y, width, height);     

        p5.registerMethod("mouseEvent", this);
    }

    mouseEvent(event) {

    const x = event.getX();
    const y = event.getY();

      console.log("mouse Event");

      switch (event.getAction()) {
        case P5.MouseEvent.PRESS:
          // do something for the mouse being pressed
        this.mousePressed();
          break;
        case P5.MouseEvent.RELEASE:
          // do something for mouse released
        this.mouseReleased();
          break;
        case P5.MouseEvent.CLICK:
          // do something for mouse clicked
          break;
        case P5.MouseEvent.DRAG:
          // do something for mouse dragged
        this.mouseDragged();
          break;
        case P5.MouseEvent.MOVE:
          // do something for mouse moved
          break;
      }

         mousePressed () {
       console.log("mousePressed Event");
     }

    mouseDragged () {
        console.log("mouseDragged Event");
     }

    mouseReleased () {
           console.log("mouseReleased Event");
    }
}

I recently taught a course on Computational Graphic Design, and the students have all handed in their assignments. This leaves me with a folder and several subfolders packed with Processing sketches. To get a visual overview of their assignments, I would like to automate the process of 1) traversing the folder structure, 2) opening all encountered ".pde" files one at a time, 3) run the open sketch, and 4) save the canvas - either directly from within Processing or via any third party software. Being able to do so will save me a lot of time, but I haven't got the slightest clue about how to make this happen. Any input will be highly appreciated. Thanks!

void mouseWheel(MouseEvent event) {
  float e = event.getCount();
}

Thanks in advance, Alex

I am new here so first i want to introduce myself. I work as an art & animation teacher in the Netherlands and i am medior practitioner with code. I know a lot about PHP/SQL, javascript and i had some projects with processing using the kinect.

My question: Is it possible to launch some code while the setup() is called, but without actualy typing that code in the setup(){} - for example: when setup() is triggered, can you use something like program.addeventlistener( onSetup, do this );

In my sketchfolder (main) are 2 files: main.pde and myclass.pde. In the main.pde we find the basic functions setup() and draw()

In the myclass.pde i have a class:

class myclass{ //constructor. myclass(){ println("myclass initialized..."); } }

Normaly, to activate/initiate the class, i have to go to main.pde setup()

myclass MC; void setup(){ myclass MC = new myclass(); } .... this works fine...

But now i want to know if it is possible to initiate the class when setup() is triggered, but without adding the [new myclass()] within the setup() function... something like this:

myclass MC; myproject.addeventlistner( "on setup", myclass MC = new myclass() );

class myclass{ //constructor. myclass(){ println("myclass initialized..."); } }

is this even possible??

I am working with processing 3.2.3

Thanks in advance.

Emiel

I'm having trouble with the mousePressed command. I cannot seem to be able to make the falling circles disappear when clicked on. Does anyone have any suggestions to help get me on the right track?

Here is what I have:

Tear t1; PImage mouseCursor; int numDrops = 80; Tear[] drops = new Tear[numDrops]; // This creates the array of tears - how many will be able to fall. void setup() { size(1000,800); background(0); smooth(); noStroke(); // This loops the array of tears. for (int i = 0; i < drops.length; i++) { drops[i] = new Tear(); // This creates the tears as objects. t1 = new Tear(); } mouseCursor = loadImage("bucket.png"); // This loads the image of the bucket as the cursor. } void draw(){ fill(0,80); rect(0,0,1000,800); // This loops the array of tears. for (int i = 0; i < drops.length; i++) { drops[i].fall(); } if(mouseX < 1000) { // This command makes the cursor the bucket image at all times. cursor(mouseCursor, 0, 0); } else { cursor(HAND); } } class Tear { // This allows the tears to be able to fall randomly at random positions on the screen. float t = random(1000); float y = random(-height); void fall() { y = y + 10; fill(0,139,211,255); // The tears themselves. :'( ellipse(t, y, 10, 10); if(y>height){ t = random(1000); y = random(-200); } } void mousePressed(){ ;if (mouseX >= t && mouseX <= t + width && mouseY >= y && mouseY <= y+ height){ fill(0); } else { fill(0,139,211,255);}} }

Thanks!

Using this database: C:\Users\-\Desktop\Processing\-\data\-.db
Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: org.jbox2d.dynamics.World.<init>(Lorg/jbox2d/collision/AABB;Lorg/jbox2d/common/Vec2;Z)V
    at fisica.FWorld.<init>(Unknown Source)
    at fisica.FWorld.<init>(Unknown Source)
    at sheergrace.setup(sheergrace.java:203)
    at processing.core.PApplet.handleDraw(PApplet.java:2281)
    at processing.opengl.PJOGL$PGLListener.display(PJOGL.java:799)
    at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:590)
    at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:574)
    at javax.media.opengl.awt.GLCanvas$9.run(GLCanvas.java:1218)
    at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1036)
    at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:911)
    at javax.media.opengl.awt.GLCanvas$10.run(GLCanvas.java:1229)
    at javax.media.opengl.Threading.invoke(Threading.java:193)
    at javax.media.opengl.awt.GLCanvas.display(GLCanvas.java:492)
    at javax.media.opengl.awt.GLCanvas.paint(GLCanvas.java:546)
    at sun.awt.RepaintArea.paintComponent(Unknown Source)
    at sun.awt.RepaintArea.paint(Unknown Source)
    at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Already called beginDraw()
Using this database: C:\Users\-\Desktop\Processing\-\data\-.db
TuioClient: failed to connect to port 3333
java.lang.NullPointerException
    at processing.mode.java.runner.Runner.findException(Runner.java:926)
    at processing.mode.java.runner.Runner.reportException(Runner.java:871)
    at processing.mode.java.runner.Runner.exceptionEvent(Runner.java:797)
    at processing.mode.java.runner.Runner$2.run(Runner.java:686)

The recommended method for running some code when closing the sketch used to be registering a dispose handler. However, it looks like the registerDispose() method from PApplet is deprecated (see Javadoc)

The following code still works but is there a recommended alternative to the registerDispose() method?

public class DisposeHandler {

DisposeHandler(PApplet pa)
{
  pa.registerDispose(this);
}

public void dispose()
{      
  println("Closing sketch");
}

}

Java version, works fine:

import processing.serial.*;

Serial myPort;
PImage img;
float lightVal;

void setup() {
  size(300,300, P3D);
  img = loadImage("cat1.jpeg");
  String devs[] = Serial.list();
  println(devs[devs.length - 1]);
  myPort = new Serial(this, devs[devs.length - 1], 9600);
  myPort.bufferUntil(10);
}

void draw() {
  background(255);
  stroke(0);
  fill(175);

  translate(width/2, height/2);
  rotateY(lightVal);

  imageMode(CENTER);
  image(img, 0,0);
}

void serialEvent(Serial myPort)
{
  String inString = myPort.readStringUntil('\n');
  lightVal = map(float(inString), 0, 150, 0, TWO_PI);
  println("LightVal=" + str(lightVal));
}

Python version, serialEvent never called:

add_library('serial')

lightVal = 0;
LF = 10 #linefeed ascii

def setup():
  global img
  global myPort
  size(300,300, P3D)
  img = loadImage("cat1.jpeg")
  portList = Serial.list()
  portName = portList[len(portList) - 1]
  print(portName)
  myPort = Serial(this, portName, 9600)
  myPort.bufferUntil(10)

def draw():
  background(255)
  stroke(0)
  fill(175)

  translate(width/2, height/2)
  rotateY(lightVal)

  imageMode(CENTER)
  image(img, 0,0)

def serialEvent(evt):
  inString = evt.readStringUntil('\n')
  lightVal = map(float(inString), 0, 150, 0, TWO_PI)
  print("lightVal=", lightVal)

regards and thanks Claudio

First i am drawing a rectangle (A) with the parent to PApplet . The rectangle (A) should be the parent of the rectangle (B) but the second rectangle isn't showing with my code. I am also not able to correctly register the "draw" method in my code.

import processing.core.PApplet;


public class Test extends PApplet {

    public void settings() {
        fullScreen();
    }

    public void setup() {
        background(21);

        clRect rectA= new clRect(this);
        rectA.left = 50;
        rectA.top = 50;
        rectA.width = 500;
        rectA.height = 500;

        clRect rectB= new clRect(rectA);
        rectB.left = 20;
        rectB.top = 20;
        rectB.width = 100;
        rectB.height = 100;
    }

    public void draw() {
        background(21);
    }

    public static void main(String _args[]) {
        PApplet.main(new String[] { test.Test.class.getName() });
    }
}

I am extending the rectangle class from another class which is supposed to be a controller class for multiple different classes.

import processing.core.PApplet;

public class clControl extends PApplet 
{
    public PApplet parent;  //The parent object referred to
    public float left; 
    public float top; 
    public float width;
    public float height; 

    public clControl(PApplet parent)
    {
        this.parent = parent;
    }
}

Finally this is the rectangle class which is causing problems for me. The first rectangle is drawn with no problem at all. The second rectangle is not able to register the "draw" method and drawing the rectangle is also a problem, it is not showing.

import processing.core.PApplet;

public class clRect extends clControl
{
    public clRect(PApplet parent) 
    {
        super(parent);

        this.left = 0;
        this.top = 0;
        this.width = 100;
        this.height = 200;

        this.parent.registerMethod("draw", this);
    }

    public void draw()
    {
        this.parent.rect(this.left, this.top, this.width, this.height);
    }
}

How to get this running? :(

so, here is my main problem for the moment, I'm trying to port this code as a class

In fact, the selectFolder use a callback function : 'fileSelected'. but when I try to do that class conversion, it seems that I can't reach the callback method inside the class : "fileSelected() could not be found".

That's a thing which loose me a bit, I tried this.fileSelected but no luck.

How can I do ?

Also I'm not sure if I can't interrupt the draw() function from that class for draw a menu, in fact I can't figure out the ideal way for make it. I can't find any exemple that use a class loading a menu. Maybe this is simply a wrong approach ?

My final goal is to process image sequences, loading them , execute a process and save them inside a new folder.

Maybe that processing isn't a good environment for what I'm trying to do ? sorry, here is the working code that I'm trying to port as a class.

PImage    img;
PFont     f;

String[]  list_file;
String    seq_png_absolutepath;
int[]     possible_seq;

int       idx_png_seq_selected;

boolean   png_menu   = false;
boolean   png_render = false;

class png_file {
  String  name;
  int     check_sum;
  int     num;
  int     len_num;
  boolean zero_format;
  boolean part_of_seq;
}

class png_sequence {
  String  name;
  boolean zero_format;
  int     len_zerof;
  int     nbr_file;
  int     first_frame;
  int     last_frame;
}

// Array Object
png_file[]     list_png;
png_sequence[] png_final_array;


void setup() 
{
  size(400, 400); 
  if (frame != null) {
    frame.setResizable(true);
  }
  f = createFont("Consolas", 16, true);
  noLoop();
  selectFolder("Select a file to process:", "fileSelected");
}

void draw() 
{

  background(0);

  if (png_menu) {
    textFont(f);       
    fill(255);

    textAlign(LEFT);
    text("Choose a sequence : ", 5, 20 );
    text("-------------------", 5, 34 );
    //mouseY
    if (mouseY >= 36  && mouseY <= 36 + 14 * png_final_array.length) {
      //beginDraw();
      fill(255, 0, 0);
      rect(0, 36 + (round(mouseY - 36) / 14) * 14, width, 14);
    }
    fill(255);
    for (int i = 0; i < png_final_array.length; i++) {
      int size_seq = 1 + png_final_array[i].last_frame - png_final_array[i].first_frame;
      text(png_final_array[i].name + ", " + size_seq + " images", 5, 50 + i * 14);
    }
  }

  if (mousePressed && png_menu) { 
    png_menu = false;
    png_render = true;
    noLoop();
    idx_png_seq_selected = (round(mouseY - 36) / 14);

    img = loadImage(png_seq_recreate_name(idx_png_seq_selected, 3));
    println(png_seq_recreate_name(idx_png_seq_selected, 3));

    frame.setSize(img.width, img.height);
    println("img.width = " + img.width);
    image(img, 0, 0);
  }
}


void fileSelected(File selection) 
{
  if (selection == null) {
    println("Window was closed or the user hit cancel.");
  } else {
    if (png_detect(selection)) {
      png_menu = true;
      loop();
    }
  }
}

String png_seq_recreate_name(int idx, int n_image) {
  //n_image is relativ, that means that it alwayz begin by zero. (n_image + first_frame)


  String a;
  String n;
  a = png_final_array[idx].name;
  n = Integer.toString(n_image + png_final_array[idx].first_frame);
  <del></del>
  if (png_final_array[idx].zero_format) {
    int zero_n = png_final_array[idx].len_zerof - n.length();
    for (int i = 0; i <  zero_n; i++) {
      println("i = " + i);
      n = "0"+ n;
    }
  }
  a = seq_png_absolutepath + "\\" + a + n + ".png";
  String b = Character.toString((char)92);

  println(b);
  println(b);
  println(b);
  println(a);
  a = a.replace("\\", "/");
  return a;
}


boolean png_detect(File selection) 
{
  String num;
  char   a  ;
  String ext;
  int    asc_l;
  int    len; 
  int    chk_sum;   
  int    png_count = 0;

  list_file = selection.list();
  seq_png_absolutepath = selection.getAbsolutePath();
  if (list_file == null) {
    println("Folder does not exist or cannot be accessed.");
  } else {

    list_png = new png_file[list_file.length];

    for (int i = 0; i < list_file.length; i++) {
      num = "";
      len = list_file[i].length();
      ext = list_file[i].substring(len - 4, len); 

      //match png 
      if (ext.equals(".png")) {
        png_count++;
        list_png[png_count - 1] = new png_file();


        //name and number
        for (int j = len - 5; j > 0; j--) {
          a      = list_file[i].charAt(j);
          asc_l  = (int) a;
          if (asc_l >= 48 && asc_l <= 57) {
            num = a + num;
          } else {
            list_png[png_count - 1].len_num = (len - 5) - j;
            list_png[png_count - 1].name    = list_file[i].substring(0, j + 1);
            break;
          }
        }


        if (num.length() > 0) {
          list_png[png_count - 1].part_of_seq = true;
          list_png[png_count - 1].num         = Integer.parseInt(num);
          list_png[png_count - 1].len_num     = num.length();

          if (num.length() > 1) {
            if (new String("0").equals(num.substring(0, 1))) {
              list_png[png_count - 1].zero_format = true;
            } else {
              list_png[png_count - 1].zero_format = false;
            }
          }
        } else {
          list_png[png_count - 1].part_of_seq = false;
        }  


        chk_sum = 0;
        for (int j = 0; j < len - 4 - num.length (); j++) {
          a = list_file[i].charAt(j);
          chk_sum += (int) a * (j + 1);
        }

        list_png[png_count - 1].check_sum = chk_sum;
      }
    }
  }




  possible_seq = new int[100]; 


  if (png_count > 0) {
    println("PNG files detected :" + png_count);
    boolean numbered_png = false;
    for (int i = 0; i < png_count; i++) {
      if (list_png[i].part_of_seq) { 
        numbered_png = true; 
        break;
      }
    }

    if (!numbered_png) { 
      println("Error : No numbered files detected !");
      return false;
    } else {
      int chk_count = 1;


      for (int i = 0; i < png_count; i++) {
        if (i == 0) { 

          for (int j = 0; j < png_count; j++) { 
            if (list_png[j].part_of_seq) {
              possible_seq[chk_count - 1] = list_png[j].check_sum;
              break;
            }
          }
        } else {

          if (list_png[i].part_of_seq) {
            boolean already_exist = false;

            for (int j = 0; j < possible_seq.length; j++) {
              if (possible_seq[j] == list_png[i].check_sum) {
                already_exist = true; 
                break;
              }
            }

            if (!already_exist) {
              chk_count++;
              possible_seq[chk_count - 1] = list_png[i].check_sum;
            }
          }
        }
      }


      png_final_array = new png_sequence[chk_count++];

      for (int i = 0; i < 100; i++) {
        if (possible_seq[i] == 0) {
          break;
        } else {

          for (int j = 0; j < png_count; j++) {

            if (possible_seq[i] == list_png[j].check_sum) {
              png_final_array[i]             = new png_sequence();
              png_final_array[i].name        = list_png[j].name;
              png_final_array[i].zero_format = false;
              png_final_array[i].len_zerof   = 0;

              for (int k = 0; k < png_count; k++) {
                if (possible_seq[i] == list_png[k].check_sum  && list_png[k].zero_format) {
                  png_final_array[i].len_zerof   =  list_png[k].len_num;
                  png_final_array[i].zero_format = true;
                  break;
                }
              }

              break;
            }
          }


          int min = 300000;
          int max = 0;

          for (int j = 0; j < png_count; j++) {
            if (list_png[j].check_sum == possible_seq[i]) {
              if (list_png[j].num < min) { 
                min = list_png[j].num;
              }
              if (list_png[j].num > max) { 
                max = list_png[j].num;
              }
            }
          }

          png_final_array[i].first_frame = min;
          png_final_array[i].last_frame  = max;
        }
      }
    }
  } else {
    println("There isn't PNG files in this folder");
    return false;
  }

  for (int i = 0; i < png_final_array.length; i++) {
    println("Seq "+ i + " : " + png_final_array[i].name + " Zf :" + png_final_array[i].zero_format + " len Zf " + png_final_array[i].len_zerof + ", first num : " + png_final_array[i].first_frame + ", last_frame : " + png_final_array[i].last_frame);
  }


  return true;
}

meaning that

void exit() {
  println("closing");
    super.exit();
  }

will be called every time the program is closed(via program,clicking on the red X,task manager...)except when closing from the processing ide. Actually by removing the call to super.exit() the code can be runned in background while looking close(SO vulnerability?). So wich one is better?

thx in advance

I am working the whole day already on this problem and still I cannot get any meaningful results, Its irritating...

I'm pretty new to Processing, so these problems are probably really easily fixed, but hey-oh.

I'd really appreciate any insight you can offer!

I'm getting the error ArrayIndexOutOfBoundsException:0 when I try to run this code:

import processing.video.*;

Capture cam;
PImage frame;
PImage destination;

void setup() {

  String[] cameras = Capture.list();

  if (cameras.length == 0) {
    println("There are no cameras available for capture.");
    exit();
  } else {
    println("Available cameras:");
    for (int x=0;x<cameras.length;x++) {
      println(cameras[x]);
    }

    cam = new Capture(this, cameras[0]);
    cam.start(); 
  }

  size(360,240);

  frame = createImage(cam.width,cam.height,RGB);
  destination = createImage(cam.width,cam.height,RGB);

  println("setup");

}

void draw() {
  if (cam.available() == true) {
    cam.read();
    println("cam read");
  }

  cam.loadPixels();
  frame.loadPixels();

  for(int x=0;x<cam.width;x++) {
    for (int y=0;y<cam.height;y++) {
      int loc = x+y*cam.width;
      frame.pixels[loc] = cam.pixels[loc];
      }
    }

  println("pixels copied");

  int threshold = 127;

  for(int x=0;x<cam.width;x++) {
    for (int y=0;y<cam.height;y++) {
      int loc = x+y*cam.width;
      if (brightness(frame.pixels[loc]) <= threshold) {
        destination.pixels[loc] = color(0);
      } else {
        destination.pixels[loc] = color(255);
      }
     }
   }

  destination.updatePixels();
  image(destination,0,0);

  println("printed");
}

Thanks in advance!

P.S. The code isn't displaying correctly in my browser, if it happens for anyone else I apologise! EDIT: it's working now, thanks to GoToLoop.