load image, video on a second window

Programming Questions

ashitaca

load image, video on a second window

in Programming Questions • 6 months ago

Hi all,

I'm trying to load a image or a video in a second window but i cant it promtps a Nullpointer error. What am I doing wrong? Many thanks id advice. Best regards

PFrame f;

secondApplet s;

import java.awt.Frame;

void setup() {

size(320, 240);

PFrame f = new PFrame();

}

void draw() {

background(255,0,0);

fill(255);

rect(10,10,frameCount%100,10);

s.background(0, 0, 255);

s.fill(100);

s.rect(10,20,frameCount%100,10);

s.redraw();

}

public class PFrame extends Frame {

public PFrame() {

setBounds(100,100,400,300);

s = new secondApplet();

add(s);

s.init();

show();

}

public class secondApplet extends PApplet {

PImage img;

public void setup() {

size(400, 300);

noLoop();

img = loadImage("ny.jpg");

}

public void draw() {

image(img, 0, 0);

}

Replies(6)

PhiLho

Re: load image, video on a second window

6 months ago

Moved here from General Discussion, as it is a regular programming question with provided code.

" it promtps a Nullpointer error"
It is generally useful to indicate the line where the exception happens, experienced programmers can spot the error without running the code nor analyzing it too deeply. Time saved for everybody.
Here, not seeing anything obvious (beside the double declaration of f, but apparently you don't use it elsewhere; note that such short variable names make them hard to search...), I have to copy & paste the code, replace the path with one image I have on my disk, and run the code...
Not much time spent, but multiply that by the number of questions in the forum...

(and it is harder when somehow uses a contributed library or some special data).

OK, I run your code, forgetting to update the image path. I got a NPE, with a quite explicit message about a missing file.
I pasted the path of an existing file, I got no NPE.
So the question is: did you put your image, with the name ny.jpg, in the data folder of your sketch?

ashitaca

Re: load image, video on a second window

6 months ago

Hi PhiLho, Hi all,

Many thanks for your reply, you are right I was vague in the explanation, I thought that NPE was because is missing something to declare or put in the right place for secondApplet. Because I have the ny.jpg file in data folder of my sketch and continues happening NPE error on line:

image(img, 0, 0);

NullPointerException

The file "ny.jpg" is missing or inaccessible, make sure the URL is valid or that the file has been added to your sketch and is readable.

Exception in thread "Animation Thread" java.lang.NullPointerException

at processing.core.PGraphics.image(PGraphics.java:3536)

at processing.core.PApplet.image(PApplet.java:12248)

at WindowImage$secondApplet.draw(WindowImage.java:57)

at processing.core.PApplet.handleDraw(PApplet.java:2266)

at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:243)

at processing.core.PApplet.run(PApplet.java:2140)

at java.lang.Thread.run(Thread.java:662)

Thanks again for your kindly help.

Regards

PhiLho

Re: load image, video on a second window

6 months ago

Ah, OK, it worked for me because I used an absolute path (avoiding to save the sketch, create a data folder, move a file there, etc.).
If I replace the loadImage() call with println(sketchPath); I see the path of the secondary sketch points to the location of Processing, not to the sketchbook!
What you can do is to load the image in the main sketch, like:
        s = new secondApplet();
        add(s);
        s.img = loadImage("py.jpg");
        s.init();
        show();
or to pass the sketchPath to s if you prefer to load the image there.

ashitaca

Re: load image, video on a second window

6 months ago

Perfect!!! that works! So I'm trying now with video but I don't know if second applet have this feature because, when I add s.myMovie = new Movie(this, "example.mov");

It prompt a s.myMovie cannot be resolved or is not a field.

PFrame f;

secondApplet s;

import java.awt.Frame;

import processing.core.PApplet;

import codeanticode.glgraphics.GLConstants;

import codeanticode.glgraphics.GLTexture;

import codeanticode.gsvideo.GSMovie;

import processing.video.*;

void setup() {

size(320, 240);

PFrame f = new PFrame();

}

void draw() {

background(255,0,0);

fill(255);

rect(10,10,frameCount%100,10);

//s.background(0, 0, 255);

//s.fill(100);

//s.rect(10,20,frameCount%100,10);

s.redraw();

}

public class PFrame extends Frame {

Movie myMovie;

public PFrame() {

setBounds(100,100,1000,1000);

s = new secondApplet();

add(s);

//s.img = loadImage("ny.jpg");

s.myMovie = new Movie(this, "example.mov");

s.myMovie.loop();

s.init();

show();

}

public class secondApplet extends PApplet {

void movieEvent(Movie m) {

m.read();

}

PImage img;

public void setup() {

size(1000, 1000);

noLoop();

}

public void draw() {

image(myMovie,100,100);

}

PhiLho

Re: load image, video on a second window

6 months ago

myMovie is defined in the frame, not in the second applet...

ashitaca

Re: load image, video on a second window

6 months ago

Yes! Many thanks, finally I make it with absolute path and works:

PFrame f;

secondApplet s;

import java.awt.Frame;

import processing.core.PApplet;

import codeanticode.glgraphics.GLConstants;

import codeanticode.glgraphics.GLTexture;

import codeanticode.gsvideo.GSMovie;

import processing.video.*;

void setup() {

size(320, 240);

PFrame f = new PFrame();

}

void draw() {

background(255,0,0);

fill(255);

rect(10,10,frameCount%100,10);

//s.background(0, 0, 255);

//s.fill(100);

//s.rect(10,20,frameCount%100,10);

s.redraw();

}

public class PFrame extends Frame {

public PFrame() {

setBounds(100,100,1000,1000);

s = new secondApplet();

add(s);

//s.img = loadImage("ny.jpg");

s.init();

show();

}

public class secondApplet extends PApplet {

Movie myMovie;

void movieEvent(Movie m) {

m.read();

}

PImage img;

public void setup() {

size(1000, 1000);

noLoop();

myMovie = new Movie(this, "******/Documents/Processing/SecondW/data/example.mov");

myMovie.loop();

}

public void draw() {

image(myMovie,100,100);

}

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