fullScreen() in processing 3.0a5

rtavakko

I noticed fullScreen() doesn't work (function doesn't exitst) in processing 3.0a5. Is there another way of switching screens mid-sketch?

GoToLoop

• Processing 3.0a5 was the last version which had PApplet extending Java's Applet.
• For all effects, all alpha versions up to 3.0a5 can be considered Processing 2.2.1.
• And thus you should look for those older approaches for fullscreen, which was called Present Mode back then.

GoToLoop

https://forum.Processing.org/two/discussion/11304/multiple-monitors-primary-dragable-secondary-fullscreen

rtavakko

Thanks for replying. So lets say I want to switch screens halfway in a sketch, would this work?

final PApplet projector = new ProjectorSketch();

void setup() {
  size(300, 300, JAVA2D);
  smooth(4);
  noLoop();
  stroke(-1);

  runSketch(new String[] { "--display=1", "--present", "Projector" }, projector);
}

void draw() {
  background(0);
  line(0, 0, width, height);
}

void keyPressed()
{
  if(key == 'a')
  {
    final PApplet projector = new ProjectorSketch();
    runSketch(new String[] { "--display=0", "--present", "Projector" }, projector);
  }
}

class ProjectorSketch extends PApplet {
  void setup() {
    size(displayWidth, displayHeight, JAVA2D);
    smooth(4);
    noLoop();
    stroke(#FFFF00);
  }

  void draw() {
    background(0);
    line(width, 0, 0, height);

    println(projector);
  }
}

GoToLoop

https://forum.Processing.org/two/discussion/comment/43044/#Comment_43044

rtavakko

I think I worded my question wrong. I want to have a single sketch and move it from one display to another when I press a key, the example seems to be bouncing between two sketches already initialized on two different screens.

GoToLoop

// forum.Processing.org/two/discussion/14660/fullscreen-in-processing-3-0a5
// GoToLoop (2016-Feb-03)

void setup() {
  size(displayWidth, displayHeight);
  frameRate(1);
}

void draw() {
  background((color) random(#000000));
}

@ Override boolean sketchFullScreen() {
  return true;
}

rtavakko

This makes the sketch full screen? How do I move it from my main screen to a monitor I've attached?

GoToLoop

• I don't believe Processing 2 (and 3.0a5) got some function to choose which monitor to use like Processing 3 w/ its fullScreen().
• In order to access such hidden configurations we're gonna need to implement our own main() over Processing's default.
• And we also need to build our own String[] w/ "--display=1" + "--present".
• Then invoke PApplet.main() from there, passing our String[] to it.
• Unfortunately we end up losing sketchPath when running from the PDE.
• Although we can have it back if we export the sketch and run it from the command line.

// forum.Processing.org/two/discussion/14660/fullscreen-in-processing-3-0a5
// GoToLoop (2016-Feb-04)

static final void main(final String[] args) {
  final String sketch = Thread.currentThread().getStackTrace()[1].getClassName();
  final String[] monitor = { "--display=1", "--present" };
  final String[] params = concat(append(monitor, sketch), args);

  PApplet.main(params);
}

void setup() {
  size(displayWidth, displayHeight);
  frameRate(1);
}

void draw() {
  background((color) random(#000000));
}

rtavakko

Cool, but it looks like the string array 'monitor' is final. How can you change it in the middle of a sketch? Will this work?

void keyPressed()
{
if(key == 'a')
{
monitor[0] = "--display=0";
}
} 

GoToLoop

• That static final void main(final String[] args) {} method is to instantiate the whole sketch.
• I dunno about any hack which would allow to switch the desired display once sketch had started.
• That is internal implementation knowledge farther beyond I can reach right now, sorry
• If you need to target 2 diff. projector displays, you're gonna need 2 running PApplet instances.
• You've already know how to instantiate extra PApplet via runSketch().
• And you know how to hide()/show() via setVisible().
• And pause/resume sketch via noLoop()/loop().
• Only thing you need is some clever way to tame 2 PApplet instances running the same algorithm, but targeting 2 diff. monitor w/ diff. resolutions.
• There are many ways to solve it. 1 approach is having a shared PGraphics.
• 1 PApplet modified the PGraphics w/ its own size() monitor resolution.
• The other uses image() to display it at the external projector.
• Passing 4 arguments allows it to be rescaled to some specific dimension:
  image(pg, 0, 0, width, height);
• In other words, both sketches gonna display the same PGraphics w/ their respective resolution.

rtavakko

Thanks so much! I think I understand what I need to do now.

rtavakko

Another question. Is it possible to make an array of PApplets? I'm thinking of getting the number of displays using the following way:

GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] devices = env.getScreenDevices();
int numberofScreens = devices.length;  

And using this integer to create 1 PApplet for each screen. Then I can just switch back and forth using enable / disable.

GoToLoop

• My knowledge about graphics internals is very poor.
• But aFaIK, you only need 1 extra PApplet instance.
• The 1st 1 we already got it free after all.
• Just use runSketch() passing to it your extra PApplet class.
• You can hide/show it setVisible() + noLoop() & loop() whenever you want to.
• Its only objective is displaying the shared PGraphics via image() w/ 5 arguments:
  image(pg, 0, 0, width, height); https://Processing.org/reference/image_.html
• This way, you can have both displays showing the same image w/ diff. scales.

rtavakko

This works great in development mode. But when I export the application and run the sketch the projector sketch doesnt run properly. Sometimes it runs, sometimes I get a weird gray screen with a small box in the center or the corner. Here is the code:

//Output sketch
Projector projector;

//Output window dimensions
int scrW, scrH;

//This is used to determine the dimensions of the output display
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] devices = env.getScreenDevices();
int numberofScreens = devices.length; 

PImage bg;

void setup()
{
  bg = loadImage("img.jpg");

  sH = bg.width;
  sV = bg.height;

  size(sH,sV);


 scrW = devices[0].getDefaultConfiguration().getBounds().width;
 scrH = devices[0].getDefaultConfiguration().getBounds().height;

  //Load with controls on the page
  setMode = true;  

  final String[] projectorArgs = {
    "--display=1", 
    "--present", 
    "--sketch-path=" + sketchPath, 
    ""
  };

  try
  {
    projector = new Projector(scrW, scrH); // instantiate
    runSketch(projectorArgs, projector); // ignite
  }
  catch(Exception e)
  {
  }
}

Am I doing something wrong?