problem with get()

Programming Questions

remi.soul..

in Programming Questions • 7 months ago

Hy hello

i am a complete beginner with processing. However i achieved a short code that works well using get().

When trying the same code with another computer, i get an error, on the line using get() :

Exception in thread "Animation Thread" java.lang.ClassCastException: [I cannot be cast to [S

at sun.awt.image.ShortInterleavedRaster.getDataElements(ShortInterleavedRaster.java:228)

at processing.core.PGraphicsJava2D.get(PGraphicsJava2D.java:2357)

at processing.core.PApplet.get(PApplet.java:15049)

at sketch_130319a.setup(sketch_130319a.java:30)

at processing.core.PApplet.handleDraw(PApplet.java:2241)

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

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

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

here is the code :

size(500,116);

PImage hetre = loadImage("hetre 04.jpg");

hetre.filter(GRAY);

hetre.resize(0,116);

image(hetre,0,0);

noSmooth();

float a = 220;

float b = 180;

float c = 140;

float d = 100;

for (int i = 1; i<width ; i=i+1) {

for (int j = 1; j<height ; j=j+1) {

float g = red(get(i,j));

if (g>a) {

stroke(255);

point(i,j);

}else if ((b<g) && (g<(a+1))) {

stroke(200);

point(i,j);

}else if ((c<g) && (g<(b+1))) {

stroke(100);

point(i,j);

}else if ((d<g) && (g<(c+1))) {

stroke(50);

point(i,j);

}else {

stroke(0);

point(i,j);

}

}}

image(hetre,0,0);

save("hetre2.png");

Thank you for your help.

Rémi

Replies(7)

amnon.owed

Re: problem with get()

7 months ago

Weird, but as an alternative you can use the pixel array directly (which is faster anyway).

loadPixels();
for (int i=0; i<width; i++) {
for (int j=0; j<height; j++) {
float g = red(pixels[i+j*width]);
// etc.
}
}
updatePixels();

GoToLoop

Re: problem with get()

7 months ago

float g = red(get(i,j));

Since variable g is an internal Processing variable related to current canvas,
methinks you should use another one perchance?

remi.soul..

Re: problem with get()

7 months ago

Thanks for answers but it didn't work.

With the pixels() command, i got the same error message on the line : loadpixels();

I also change the variable name t_pix but it didn't work either...

What i can't understand is why it worked perfectly with my first computer (windows7 starter edition) and it doesn't work with 2 other ones (windows XP - i am an old fashion guy...)

Could it be the exploitation system?

Thank you for your help.

Rémi

remi.soul..

Re: problem with get()

7 months ago

I use this post to submit another subject.

After this (if my code shall work) I need to send my data to excel for some VBA programming.

For the moment I use the app "ImageJ" which can export a png file to a text file ( = each cell is a number between 0 and 255, corresponding to the grey value of pixels)

is there a way to code this directly in Processing, to avoid the opening of imageJ.

thanks for your help.

Rémi

GoToLoop

Re: problem with get()

7 months ago

With the pixels() command,...

I guess you meant color[] pixels variable?

remi.soul..

Re: problem with get()

7 months ago

I just installed processing-1.5.1 for windows and it works again.

It must be a bugg of the new version with windows xp

thank for your help anyway.

if someone has a code to send data to excel, it would be very helpfull.

Rémi

PhiLho

Re: problem with get()

7 months ago

Use brightness() and saveStrings() to save pixels[] to a text file, via an intermediary array, of course.

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