Processing 1.0 - Processing Discourse - Image not loading properly, or what?

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Index › Programming Questions & Help › Syntax Questions › Image not loading properly, or what

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Image not loading properly, or what? (Read 378 times)

Mascimo

Image not loading properly, or what?
Jun 10^th, 2009, 7:51am

Code:

PImage [] fundo = new PImage [5];
color [][] imagem;

void setup(){
  fundo[0] = loadImage ("1.jpg");
  fundo[1] = loadImage ("2.jpg");
  fundo[2] = loadImage ("3.jpg");
  fundo[3] = loadImage ("4.jpg");
  fundo[4] = loadImage ("5.jpg");
  size(647,400);
  for (int i = 0; i < width; i++) {
    for (int j = 0; j < height; j++) {
	imagem[i][j] = fundo[1].get(i,j); //Here I get a Null Pointer Exception
    }
  }
}

this is a piece of code I am using to load different images into an array of PImage variables, so then I can copy each of them at a time (by pressing different keys) to a two-dimensional array of color variables.

This two-dimensional array is then used to get colors from pixels of the image based on mouse position.

Anyway, I can't see the problem with this code.

PhiLho

Re: Image not loading properly, or what?
Reply #1 - Jun 10^th, 2009, 8:13am

I don't know if that's the problem, but I would apply the advice given in the size() reference: "The size() function must be the first line in setup().".

It might help ensure that the data folder is correctly initialized internally, so that the loadImage() calls find the images there (supposing they are actually there, of course).

Mascimo YaBB Newbies Offline Posts: 13	Re: Image not loading properly, or what? Reply #2 - Jun 10^th, 2009, 8:16am Changing size() to the first line in setup made no difference, I am still getting the NullPointerException at the same line. But I will keep size to the first line as a good practice.

NoahBuddy Ex Member	Re: Image not loading properly, or what? Reply #3 - Jun 10^th, 2009, 8:33am Are the images the same size as your sketch? Use fundo[1].width and fundo[1].height instead of just width or height. Those belong to the PApplet instead of the image. Edit: Just realized your color array has not been initialized. imagem = new color[width][height];

Mascimo YaBB Newbies Offline Posts: 13	Re: Image not loading properly, or what? Reply #4 - Jun 10^th, 2009, 8:41am Now i get an Array Index Out of Bounds Exception:0 that's weird because a matrix of size[n] goes from 0 to n-1 right?

NoahBuddy Ex Member	Re: Image not loading properly, or what? Reply #5 - Jun 10^th, 2009, 8:49am Be sure to initialize imagem after size(). It ran OK here.

Mascimo YaBB Newbies Offline Posts: 13	Re: Image not loading properly, or what? Reply #6 - Jun 10^th, 2009, 9:27am now it ran fine, thanks a lot!

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: Image not loading properly, or what? Reply #7 - Jun 10^th, 2009, 9:36am NoahBuddy, you have a good eye for these little culprits!

NoahBuddy Ex Member	Re: Image not loading properly, or what? Reply #8 - Jun 10^th, 2009, 11:39am I've had trouble with most of them myself.

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