Is there a way around it?

import java.awt.Rectangle;
import java.awt.*;
import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.awt.AWTException;
import java.awt.event.InputEvent;
import java.awt.event.KeyListener;

PImage screenshot;
int PixelY;
int PixelX;
int Trigger;
int buttons;
Robot robot;
int triggerkey;

static final String RENDERER = FX2D;
static final int FPS = 60, DELAY = 100/FPS/4, SMOOTH = 3;

void setup() {
  size(1920, 1080, RENDERER);

  smooth(SMOOTH);
  frameRate(FPS);
  imageMode(CORNER);

  screenshot = createImage(displayWidth, displayHeight, ARGB);
  thread("screenshotThread");
  //
  try { 
    robot = new Robot();
  } catch (AWTException e) {
    e.printStackTrace();
    exit();
  }
}

void draw() {
  image(screenshot, 0, 0, width, height);
  frame.setTitle("FPS : " + round(frameRate));
  fill(1,1,1);
  rect((1920/2),(1080/2+1),1,1);
  PixelX = get((1920/2),(1080/2));

  if(PixelY != PixelX){
    print("Trigger Enabled");
      Trigger = 1;
  } 

  if (PixelY == PixelX){
    Trigger = 0;
  } else {
    Trigger = 1;
    println("Toggled");
  }
  delay(1);
  PixelY = get((1920/2),(1080/2));

  print("(");
  print(PixelY);
  print(":");
  print(PixelX);
  print("(");
  println();
  if (keyPressed) {
    println(true);
    if(key == 'f'){
      println("Holding");
      triggerkey = 1;
    }
  } else { 
      triggerkey = 0;
      println(false);
  }
}

void screenshotThread(){
  final PImage shot = screenshot;
  final Rectangle dimension = new Rectangle(displayWidth, displayHeight);
  final Robot robot;

  try {
    robot = new Robot();
  }

  catch (AWTException cause) {
    exit();
    throw new RuntimeException(cause);
  }
  for (;; delay(DELAY))  grabScreenshot(shot, dimension, robot);
}

static final PImage grabScreenshot(PImage img, Rectangle dim, Robot bot) {
  bot.createScreenCapture(dim).getRGB(
    0, 0, 
    dim.width, dim.height, 
    img.pixels, 0, dim.width);

  img.updatePixels();
  return img;
}

void alt(KeyEvent e){
  if(e.getKeyCode() == 18){
  }
}

void keypressed(){
  if(triggerkey == 1){
    if(Trigger == 1){
       robot.mousePress(InputEvent.BUTTON1_MASK); 
       robot.mouseRelease(InputEvent.BUTTON1_MASK);
       print("Active");
       println("");
       delay(450);
    }
  }
}

I tried to use the thread() command in the switching of the videos but nothing happened. I put a println to see the thread but alway show the main thread, I really don't know if I'm doing this ok..

Thanks a LOT for any help!

import processing.video.*;

File path; 
String[] files;
int numfiles = 0;
int timer = -5000;
int tcontrol= 2000;
int numVideos=9;

VideoM[] v = new VideoM[numVideos];
Movie[] vv;

void setup(){
  size(1920, 1080, P2D);
  frameRate(60);
  files = files(); 
  numfiles = files.length;
  if (numfiles>11) numfiles=11;
  loadvideos();

  for(int i = 0;i < numVideos;i++){
     v[i] = new VideoM();
  }
}


void draw() {

  background(0);
  for(int i = 0; i <numVideos; i++){
     v[i].display();
  }

  if ((millis() - timer) > tcontrol)  {
    thread("newvideo");   
    timer = millis();
    tcontrol= int(random(2,6))*1000; 
}
}


void loadvideos(){

 String video;
 vv = new Movie[numfiles];

 for (int i=0; i<numfiles; i++){
   video= files[int(random(numfiles))];
   vv[i] = new Movie(this, video);
   println ("Loading ", video);
 }
}

class VideoM {

 Movie m;
 String video;

 int x;
 int y;
 int w;
 int h;
 int alpha;
 int alphai;
 int fadeout=0;

 VideoM() {
  genera();
  println(numfiles);
  m = vv[int(random(numfiles)) ];
  m.loop();
  // m.volume(random(0.4,0.6));
  // m.speed(random(0.6,1.0));
  m.jump(random(m.duration()));  
  //m.play(); 
 }

 void genera(){
    x=int(random(50, width/2+width/4)); 
    y=int(random(50, height/2+height/4)); 
    w=int(random(280,820));
    h=int(w/1.88);
    alpha=int(random(100,255)); 
    alphai=0; 
 }

 void display(){
   tint(255, alphai);
   if (fadeout==0) {
     alphai++; if (alphai>alpha) alphai=alpha;
   } else {  alphai--; if (alphai<0) {alphai=0;fadeout=0;this.newvid();}
     }

   if (frameCount > 1) { image(m, x, y, w, h); }
 } 

 void cambiavid(){
   fadeout=1;
 }

void newvid() {  
   m=null;
   int j=int(random(numfiles));
   println("cambio: ", j);
   m = vv[j];
   m.loop();
   genera();
   m.jump(random(m.duration())); 
   println(Thread.currentThread());
 }
}  

void newset(){
  for(int i = 0;i < numVideos;i++){
    println(i);
    v[i].newvid();
  }
}

void newvideo(){
  int i = int(random(numVideos));
  //v[i].nuevovid(this);
  v[i].cambiavid();
}

void movieEvent(Movie m) {
  m.read();
}

boolean bStop,bColor=true;
boolean bSave=false,bVidO=false;
void keyPressed()
{
  int k = keyCode;

  // reset all videos
  if (key == 'n' || key == 'N') {
    newset();
    }

}  


// load files in data

String[] files(){
// The data path of the folder to look in (write your own)
java.io.File folder = new java.io.File(dataPath(""));

// let's set a filter (which returns true if file's extension is .jpg)
java.io.FilenameFilter pngFilter = new java.io.FilenameFilter() {
  public boolean accept(File dir, String name) {
    return name.toLowerCase().endsWith(".mp4");
  }
};

// list all the folders inside the main directory
String[] listFolders = folder.list(new java.io.FilenameFilter() {
  public boolean accept(File current, String name) {
    return new File(current, name).isDirectory();
  }
});

// list the files in the data folder, passing the filter as parameter
String[] filenames = folder.list(pngFilter);

return(filenames);
}

The thing I am currently using is this:

void lag(float time){
int millis=millis();
while(millis()<millis+time/1000){float wow=floor(sin(0));}
}

This makes me able to run function lag(5); and that will make it wait 5 seconds, however this also eats a lot of CPU while it waits.

Or I can spam loadStrings("https://www.google.com"); a couple of times, which does not eat CPU, but is too unpredictable.

Is there a function that will work the same as my lag() function, but does not actually consume CPU?

The purpose of the code is to read a json file located on my home server every minute and write it to a local file that is then read by the main artwork processing sketch which drives a large inflatable sculpture. The value in the json file is live share market prices and the artwork is : https://andrewstyan.com/portfolio/life-support-system/

The code has a draw loop which simply draws a performance chart of various monitoring variables and some stats. This is emailed to me when requested (hourly as triggered by a flag in the json file). As far as I can tell there is no code in the draw loop that should take any time. The frameRate() is set to 2 as the draw loop does very little and does not need to run any faster.

Four threads do the work, each based on a while(true) { .. code ... delay() } loop:

1) internet quality checker:

• 3 times per minute (at 10, 30, 50 sec) check within a try/catch what is returned by: Process ping = Runtime.getRuntime().exec("ping " +" -c "+" 1 "+"www.google.com" );

• maintain an internetOK boolean

• maintain an error count for consecutive failures

• maintain a ping time

2) read the server file:

• at 20 seconds into the minute read the server json file if internetOK == true;

• maintain some monitor flags and variables - eg. loadFailed, loadTime

3) write the local data file

• at 40 seconds into the minute write the data read from the server file to the local data file (if the "read the server" thread has not completed it's task then the previous data will be written)

4) an error loop which monitors all the status variables and escalates compounding issues, such as bad internet quality or repeated read errors.

A log file is maintained (and emailed on request) that logs the 'write local data' event and errors that can be detected by various logic tests, such as a file load taking too long or escalating errors.

Two problems are occurring which are probably related.

1) Every 5 or 6 minutes the server file is not communicated through to the next sketch. This was much worse (every 2 minutes) until I realised the file was frequently taking 10 seconds to be read from the server (the wifi quality is quite poor in the gallery where the work is installed). The sketch should be able to deal with this and I reduced the problem by extending the time I allowed for reading a file.

2) Although the framerate of the draw loop is set at 2 fps it actually runs MUCH slower, frequently running less than 7 frames per minute rather than 120. I can tell this from the event log which includes a time stamp and frame count for each entry, and there is an entry about every minute.

Perhaps problem 1 is caused by problem 2 but I do not understand what is slowing the draw loop. I can probably recode the sketch to better handle the poor wifi, but still need to understand the slow frame rate as they may be related. It shouldn't be a computer power issue as the sketch for the main artwork is far more computer intensive but is operating correctly at the set rate of 17 fps.

Help please:

• Can anyone suggest what would be slowing the draw loop? It does very little and I understood that threads do not/cannot block the draw loop. Does the slow draw loop impact on the performance/timing of the threads or vice versa? Each thread uses the second() function to trigger its action, does this depend on the draw loop? I have made a simple sketch that confirms that none of these interactions should occur.

• Any suggestions for diagnosing this from afar? The local staff are not computer literate at all. I can add more sophisticated remote diagnostics to the sketch (especially around actual durations to read and save files) and get them to compile it locally but that may be a stretch.

• Any ideas for simulating the behaviour locally? What could I try to slow the draw loop like this ?

I can post code or segments here, but it is massive and for obvious reasons I can't reduce it down to the minimum size that causes the problem. The draw() loop is below. The booleans are set in the threads. The calls are to simple functions that shouldn't block.

The remote machine is a 2014 mac-mini, definitely not latest OS and probably not latest Java. Processing 3.3.6 (I think).

Thanks in advance, Andrew

    void draw() {
      background(50);
      fill(160);
      stroke(200);

      if (frameCount == 150)  // start the status writing thread once the system stabilises
      {
        thread("statusLoop");
        statusRecord = "starting status loop";
      }

      getTime();

      if(hour()==0 && minute()==0 && second()<2) resetChart();

      // end of draw

      // internet
      img.beginDraw();
      if (internetOK) fl = green;
      else fl = red;
      if (inChecking) fl = blue;
      stroke(fl);
      fill(fl);
      rect(10, 10, 10, 10);
      float pt = map(pingTime, 0, 300, 75, 0);
      img.fill(fl);
      img.stroke(fl);
      if (!inChecking) img.line(scrapeMins, pt, scrapeMins+3, pt);

      if (internetFailed) fl = red;
      else fl = green;
      if (inChecking) fl = blue;
      stroke(fl);
      fill(fl);
      rect(22, 10, 10, 10); 
      img.fill(fl);
      img.stroke(fl);
      pt = map(timeDiff, 0, 270000, 150, 75);
      if (!loadingPackage) img.ellipse(scrapeMins, pt, 2, 2);

      img.endDraw();
      image(img, 0, 30);
      stroke(170);
      line(scrapeMins, 30+50, scrapeMins, 30+100);

      fill(150);
      text(pingTime, 50, 20);
      text("Fails: "+internetFails, 150, 20);

      // time
      text(scrapeTimeHMS(now), 400, 20);

      // reader
      if (!loadFailed) fill(0, 255, 0);
      else fill(255, 0, 0);
      if (loadingPackage) fill(0, 0, 255);
      rect(10, 200, 10, 10);
      fill(150);
      text("Load time: "+nf(loadTime, 2, 0)+"   Time stamp difference: "+timeDiff, 50, 200);
      text(packageTxt, 50, 220);

      text(statusRecord, 50, 300);

      text(getRowSummary(), 50, 350);

      reportLoop();
    }

is there a way to sequencially load images directly from disk with realtime perfomance? loadImage is very slow, and I would like to avoid preloading the images first.

I could do this with old good Flash with Full HD imagery in realtime, so it has nothing to do with my disk performance.

Thanks for any hints Tom

Android==>ESP8266==>Arduino arduino responda a la peticion.

Android<==ESP8266<==Arduino

Para esto Android realiza la peticion utilizando loadstring, el codigo android seria el siguiente.

    void setup() {
      fullScreen();//ANCHO DE LA PANTALLA
      background(#000000);//COLOR DEL FONDO HEXADECIMAL (NEGRO)
      //stroke(#FFFFFE);//GROSOR DEL TRAZO EN  HEXADECIMAL
      strokeWeight(5);//GROSOR DEL TRAZO EN PIXELES
    }

    void draw() { 
     fill(#848484);//COLOR RECTANGULO
     rect (150,50,150,50);//DIBUJA UN RECTANGULO X,Y,ANCHO,ALTO
     fill(#000000);//COLOR RECTANGULO
     rect (10,10,100,100);//DIBUJA UN RECTANGULO X,Y,ANCHO,ALTO

     textSize(26);//TAMAÑO DEL TEXTO
     fill(#FFFFFF);//COLOR PARA TEXTO 
     text("PETICION", 160 , 75);//DIBUJA EL TEXTO

     }
     void mousePressed  (){ //PARA PRESIONAR BOTONES

       if(mouseX > 150 && mouseX < 650)
         if (mouseY > 50 && mouseY < 200){
           textSize(26);fill(#BDBDBD); text("PETICION", 160 , 75); 
           thread("Envio");
         }
    }
      //FUNCIONES METODO THREAD
      void  Envio () {
        String[] lines = loadStrings("http://192.168.1.37/A");
    println("there are " + lines.length + " lines");
    for (int i = 0 ; i < lines.length; i++) {
      println(lines[i]);//IMPRIME EN EL TERMINAL
    }
      }

La sentencia loadstring es String[] lines = loadStrings("http://192.168.1.37/A"); se cambia al subir el post. Esta sacado del ejemplo loadstring, el tema es que cuando realiza una peticion por internet a cualquier pagina funciona correctamente, sin embargo cuando se realiza a arduino esto es lo que se recibe a traves de la consola de arduino.

    0,CONNECT

    +IPD,0,187:GET /A HTTP/1.1
    User-Agent: Dalvik/2.1.0 (Linux; U; Android 8.0.0; Android SDK built for x86 Build/OSR1.170901.056)
    Host: 192.168.1.37
    Connection: Keep-Alive
    Accept-Encoding: gzip

Hasta aqui la cosa va bien entonces utilizando el metodo AT+CIPSEND envio algunos caracteres escribiendo en el terminal

AT+CIPSEND=0,33
><html><h2>holamundo</h2></html>\n

tambien he probado quitandole la terminacion \n

y se recibe esto en arduino diciendo que se ha enviado con exito.

AT+CIPSEND=0,33


OK
> 

busy s...

Recv 33 bytes

SEND OK
AT+CIPCLOSE=0

0,CLOSED

OK

Pero cuando cierro la conexion se produce un null pointer con un monton de excepciones y no se recibe nada.

java.io.IOException: unexpected end of stream on com.android.okhttp.Address@cd6325c0
    at com.android.okhttp.internal.http.Http1xStream.readResponse(Http1xStream.java:201)
    at com.android.okhttp.internal.http.Http1xStream.readResponseHeaders(Http1xStream.java:127)
    at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:737)
    at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:609)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:471)

A alguien se le ocurre que estoy haciendo mal.

El caso es que si lo hago a traves de un navegador como Chrome se recibe lo siguiente:

// read properties

     final File f2 = dataFile(STILLPROP_PATH);
     if(f2.exists()) { f2.delete(); }
     open("c:/avspit/stillcap /listproperties > c:/avspit/stillprop.txt");
     delay(600);
     while (!f2.exists()) { s+="."; 
     delay(300); // Avoids frying CPU!
     //println(s);                
     }

The only values it is showing me are 0% and 100%. I want to find a way to either draw the progress bar individually or redraw the whole screen inside that for loop.

Thx for help in advance.

final static int TIMER = 5 * 1000;  
static String msg; 
static boolean isEnabled = true; 
int left=0;
int f = 255;

void setup() {
  size(320, 240);
  fill(#FFFF00);
  textSize(32);
  textAlign(CENTER, CENTER);
  fireTimer();            // this one works
  thread("timer");  
}

void draw() {
   f = (f > 10) ? f-10 : 255;
  fill(f);
  rect(left, 10, 10, 10);
  left += 10;
  if (left > width) left = 0;
}

void fireTimer() {
    msg = nf(minute(), 2) + ":" + nf(second(), 2);
    println("Triggered @ " + msg);
    fill(0);
    rect(width/4, height/4, width/2, height/2);
    fill(255);
    text(msg, width/2, height/2);
}

void timer() {
 while (isEnabled) {
    delay(TIMER);
    fireTimer();
  }
}

int[][] map;
int mapWidth = 100;
int mapHeight = 100;
int drawScale = 4;

int tick = 0;
int tickRate = 2;

void settings() {
  size(mapWidth*drawScale, mapHeight*drawScale);
}

void setup() {
  frameRate(240);
  surface.setTitle("Pixel Fluid");
  map = new int[mapWidth][mapHeight];

  for (int i = 0; i < mapWidth; i++) {
    for (int j = 0; j < mapHeight; j++) {
      setMap(i, j, 0);
    }
  }
  thread("physics");
}

void draw() {
  tick++;
  surface.setTitle("Pixel Fluid | " + frameRate + " " + tick % tickRate);
  for (int i = 0; i < mapWidth-1; i++) {
    for (int j = 0; j < mapHeight-1; j++) {
      fill(mapTileColor(i, j)); 
      noStroke();
      rect(i*drawScale, j*drawScale, drawScale, drawScale);
    }
  }

  thread("physics");

  if (mousePressed) {
    switch (mouseButton) {
    case RIGHT:
      setMap(mouseX/drawScale, mouseY/drawScale, 1);
      break;

    case LEFT:
      setMap(mouseX/drawScale, mouseY/drawScale, 2);
      break;
    }
  }
}

void physics() {
  for (int i = 0; i < mapWidth-1; i++) {
    for (int j = 0; j < mapHeight-1; j++) {
      if (getMap(i, j) == 2 && getMap(i, j+1) == 0 && tick % tickRate == 0) {
        setMap(i, j+1, 2);
        setMap(i, j, 0);
      }
    }
  }
}

void setMap(int x, int y, int tile) {
  map[x][y] = tile;
}

int getMap(int x, int y) {
  return map[x][y];
}

color mapTileColor(int x, int y) {
  switch(getMap(x, y)) {

  case 1:
    return #000000;

  case 2:
    return #0000FF;

  default:
    return #FFFFFF;
  }
}

I want to make the gravity work on a water particle every 2 ticks, so it looks like it's falling. Instead, when you left click to place the water it falls instantly. How can I have a "fixed update" function, where the gravity would only occur every a certain amount of frames?

I'm trying to do a game wich is written in c# and I want to force this game to coexistence with a Processing application and communicate with it. So the default stage is --> C# server read and write data too to the client : Processing.Net OR java.net (I have tried both) read and write data too but don't blocking the Processing main thread because I need the draw method in Processing too.

So as I write here I have already tried processing.net.client to connect to the C# TcpListener but I think this is just not possible? And now I can connect to the server with java.net.Socket but when I trying to write a message in C# to the Processing the C# says to me how the Processing is forced the socket to close.. So I can't send data to it.. (The threading is created with the Processing thread("...") method)

M. Márkó (MDEV) , Hungary

void handleClicks (ArrayList buttons) {
  for (Button button : buttons) {
    if (button.isPressed()) {
      method(button.getCallback());
    }
  }
}

I wanted to know more about it. However, google hasn't been too helpful locating this due to the meta nature of the method. Is this from Java or Processing Core?

public void mouseClicked() {
        if (room.equals("game")) {
            for (Group group : discoveredGroups) {
                group.groupClicked();
            }
            for (Group groupSelected : groupSelectedList) {
                if (groupSelected != null) {
                    groupSelected.groupClicked();
                }
            }
            for (Button button : buttons) {
                button.buttonClicked();
            }
            for (Arrow arrow : arrows) {
                arrow.arrowClicked();
            }
            for (Pane pane : panes) {
                pane.paneClicked();
            }
            // avoid concurrent modification error
            if (elementClickPause == false) {
                for (Element element : elementListA) {
                    if (element != null) {
                        element.elementClicked();
                    }
                }
                for (Element element : elementListB) {
                    if (element != null) {
                        element.elementClicked();
                    }
                }
            }
        } else if (room.equals("menu")) {
            for (Button button : buttons) {
                button.buttonClicked();
            }
            if (drawPackList == true) {
                for (Pack pack : packObjects) {
                    pack.packClicked();
                }
            }
            for (Arrow arrow : arrows) {
                arrow.draw();
            }
            for (Pane pane : panes) {
                pane.paneClicked();
            }
        } else {
            for (Button button : buttons) {
                button.buttonClicked();
            }
        }

But how do I call MenuScreen.initialize() with thread()? It gives me an error in the console that says "There is no public MenuScreen.initialize() method in the class MainClass".

Here's a trimmed version of what I have so far. The main class:

import gifAnimation.*; // used for the loading icon

Screen curScreen;
boolean doneLoading;
Sprite loadingGif;

void setup()
{
  size(600, 600);
  frameRate(30);
  loadingGif = new Sprite(this, "loading flower.gif");
  doneLoading = false;
  curScreen = new MenuScreen();
  thread("MenuScreen.initialize");
}

void draw()
{
  background(50);
  if(doneLoading) curScreen.screenDraw();
  else loadingGif.drawThis(width - 60, height - 60);
}

And the MenuScreen class, which implements a very simple Screen interface that stipulates its initialize() and screenDraw() methods:

class MenuScreen implements Screen
{
  int curSelection; // which selection item the cursor is on right now: new game, load game, etc.
  PImage backgroundImg;
  PImage cursorImg;

  MenuScreen()
  {
  }

  void initialize()
  {
    backgroundImg = loadImage("WelcomeBackground.png");
    cursorImg = loadImage("WelcomeCursor.png");
    doneLoading = true;
  }

  void screenDraw()
  {
    image(backgroundImg, 0, 0, width, height);
    text("Herro wuorld", 50, 50, 200, 200);
  }
}

I've also tried using thread("initialize") in MenuScreen's constructor, but that tries to look for an initialize function in the main class, too. I suppose I could just make the Initialize function a global function, but that doesn't seem like optimal coding standards when all I should need is a proper String for my call to thread()...

I have installed the last GL video version, to see if I can solve my "jump" problems (https://forum.processing.org/two/discussion/13673/jump-in-videolibrary-causes-java-error#latest).

But, with version 1.2.1 playing the videos the image freezes constantly.

I'm testing it in 5 different Raspberry at the same time, with the same results (253% CPU!). All software updated.

PID USER      PR  NI    VIRT    RES       SHR S    %CPU  %MEM     TIME+ COMMAND                 
1033 pi        20   0  457288  91032  13084 S 253.2 23.2 351:44.38 java 

I'm also playing the same video file in 8 Raspberry, same hardware and software, but with GL video 1.2. Better performance:

PID USER      PR  NI    VIRT    RES        SHR S      %CPU   %MEM   TIME+ COMMAND                 
1069 pi         0 -20  371956  58540  12232 S  48.3 14.9 136:07.68 java   

Video file:

Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 800x480, 9462 kb/s, SAR 1:1 DAR 5:3, 60 fps, 60 tbr, 60 tbn, 120 tbc (default)
Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)

Any help is welcome!

Best.

I am trying to load headlines from say for example bbc.co.uk. My code loads the XML, and then in void draw, it displays the headline by scrolling from right to left. That works all good.

But if my first paragraph is true, that means that in void draw, it will run out of headlines to print, and it will just repeat the content due to loadXML being load only once. Is that right?

Is there anyway to check it from time to time?

// Example 17-3: Scrolling headlines 

// An array of news headlines
String[] titles; /*= {
  "Processing downloads break downloading record." , //   Multiple Strings are stored in an array.
  "New study shows computer programming lowers cholesterol." ,
};*/
PFont f; // Global font variable
float x; // Horizontal location
int index = 0;

void setup() {
  size(400,200);
  f = createFont( "Arial" ,16,true);
  // Initialize headline offscreen
  x = width;


    String url = "http://www.worldpress.org/feeds/topstories.xml"; 

  XML rss = loadXML(url);
  // Get title of each element
  XML[] titleXMLElements = rss.getChildren("channel/item/title");
  titles = new String[titleXMLElements.length];
  for (int i = 0; i < titleXMLElements.length; i++) {
    String title = titleXMLElements[i].getContent();
    // Store title in array for later use
    titles[i] = title;
  }
}

void draw() {

  background(255);
  fill (0);
  // Display headline at x location
  textFont(f,16);
  textAlign (LEFT);
  text(titles[index],x, 20); // A specific String from the array is displayed according to the value of the “index” variable.
  // Decrement x
  x = x - 1;
  // If x is less than the negative width,
  // then it is off the screen
  float w = textWidth(titles[index]); // textWidth() is used to calculate the width of the current String.
  if (x < -w) {
    x = width;
    index = (index + 1) % titles.length; // “index"is incremented when the current String has left the screen in order to display a new String.
  }
}

ArrayList<String> strs = new ArrayList<String>();
String state;
float counter;

void setup() {
  size(640, 480);
  state = "load";
  noStroke();
}

void draw() {
  if (state.equals("load")) {
    load();
  } else if (state.equals("loading")) {
    background(255);
    fill(255, 0, 0);
    rect(0, height/2-25, map(counter, 0, 10000000, 0, width), 50);
  } else if (state.equals("play")) {
    background(0, 255, 0);
  }
}

void load() {
  state = "loading";
  for (int i = 0; i < 10000000; i++) {
    strs.add(str(pow(i, 2)));

    if (i % 1000 == 0) {
      counter = i;
      draw();
    }
  }
  state = "play";
}

But I just get a grey screen (indicating that background(255) has never been called) for about 5 seconds until I get a green screen. I could, of course, replace the code with something like:

ArrayList<String> strs = new ArrayList<String>();
String state;
int counter;

void setup() {
  size(640, 480);
  state = "load";
  noStroke();
  counter = 0;
}

void draw() {
  if (state.equals("load")) {
    float theMillis = millis();
    while (millis()-theMillis < 1000.0/frameRate && counter < 10000000) {
      strs.add(str(pow(counter, 2)));
      counter++;
    }
    if (counter >= 10000000) {
      state = "play";
    }

    background(255);
    fill(255, 0, 0);
    rect(0, height/2-25, map(counter, 0, 10000000, 0, width), 50);
  } else if (state.equals("play")) {
    background(0, 255, 0);
  }
}

And that would work for this simple example, but I am trying to get draw() to work when called from a function explicitly as depending on the complexity of load() (the one I'm actually trying to get to work in my project is 250+ lines long of opening and uncompressing files, processing JSONArrays and ArrayLists, etc.) splitting the load function into chunks inside draw() could be a nightmare. So is there anyway to update the screen from inside a function?

Thanks in advance for all your help :)

 public void insertionSort()
 {
    for(int i = 0; i < arr.length; i++)
    {
        while(j > 0 && arr[j-1] > arr[j])
        {
            swap(arr, j, j-1);
            j--;
            draw();
        }
        j = i;
    }
  }

 public void draw()
 {
     (draw everything)
 }

I know for simpler sorts like selection and insertion sort you could make the sort work within the draw function itself, which i have done, but that wont work for sorts that use recursion like quick sort and merge sort (at least i cant think of how to get them to work). So basically, my question is is there any way to choose when the draw function executes so i can call it and have it update when i want? I have tried the redraw() function but that doesn't seem to be fast enough, and simply calling draw doesn't do anything either. I also tried running the sort in a separate thread, which sort of works but has some bad side effects with the screen glitching out.

Does anyone know what this might be? It's been hard searching for "processing performance" in relation to the actual program "Processing". Thanks!

The program continues and before the scan finishes and puts a file in the directory I use to put up image, it gets to the load file statement and can't find it , it's not there yet.

I am trying to use this code to test the file exists before letting the program continue but it complains "unexpected token boolean"

boolean fileExists(String "test.png")

File file = new File("test.png");

while(!file.exists());

Am I on the right tract?

int i = 0;
float time = 0;

void setup() {
  size (300, 300);
  noLoop();

  while (time < 3000) {
    time = millis();
    if (time > i*500) {  
      drawsomething();
      //redraw();
      print(i);
      i++;
    }
  }
}

void drawsomething() {
  background(0);
  fill(255);
  rect(10, 10, 20, 20);
}

void draw() {
  background(0);
  fill(255);
  rect(10, 10, 20, 20);
}

I have to sychronize an animation to 1 frame per second.

Until now I used the millis() function for the timing. But annoyingly the time is running away. The Code is like:

draw(){
  while ((millis () >= time + timeStep)){
    println(time);
    ...
  }
  time = millis();

With timeStep = 500 I get time codes like:

8165,
8768,
9305,
9818

What I want is:

8000,
8500,
9000,
9500

How do I reallize this?

In one of my programs I am loading three images on runtime from set of images in a folder. The images are changing runtime. Raspberrypi is fast enough to run the code and atleast load three images of each less then 150kb and of resolution 1260x760.

But my output becomes extremely slow while loading these images together. Loading one image runs smooth, two slower and three super slow. I have no guess about why is processing not able to run fast when Raspberypi is capable to running the code. The same code runs with perfect speed on my laptop in windows.

Part of the code is as under :

  //Load Images
  imgA = loadImage(path+ displayuserid +"/"+ displayobjectid +"/" + (imageno)%36 +  ".jpg");
  imgB = loadImage(path+ displayuserid +"/"+ displayobjectid +"/" + (imageno+1)%36 +  ".jpg");
  imgC = loadImage(path+ displayuserid +"/"+ displayobjectid +"/" + (imageno+2)%36 +  ".jpg");     


    //Display Images
    imgA.resize(0,250);
    image(imgA, width/2 - imgA.width/2, height/2 + height/2 - imgA.height);      


     pushMatrix();
     translate(width/2,height/2);
     rotate(90*TWO_PI/360);
     imgB.resize(0,250);
     image(imgB, -imgB.width/2, height/2-imgB.height);
     popMatrix();

     pushMatrix();
     translate(width/2,height/2);
     rotate(-90*TWO_PI/360);
     imgC.resize(0,250);
     image(imgC, -imgC.width/2, height/2-imgC.height);
     popMatrix();  

One way I can think of for doing this is using the GPU multicore architecture to parallelize the calculations but is this feasible with processing?

i know how to play/loop an existing video. but what if i have a folder in which videos will be copied (from an external source – in my case a raspberry pi that uploads captured video clips) dynamically?

can i add videos to my canvas on runtime? there is a function to list folder contents – but i don't know HOW TO dynamically add video sources to a running project.

is there any help? or a definitive "NO" …? thanks anyways!

– stephan