I have a bit of code that adds instances of a class to a list. I get a 'local variable may not have been initialized error' when I try to add one item to an ArrayList. I can fix the problem easily by doing this in the declaration:

Point tempPoint1, tempPoint2=null;

...as I'm not a fan of making things point to nothing (seems as bad as not being initialized to me!), is there a 'proper' way to do this or is it a case of refactoring?

Incidentally, the code works properly and, so far as I can tell, there is no possibility of tempPoint2 not being assigned a value before it is added to the list.

TIA

Paul

I have a number of image files that I'd like to rename (or copy each to a new file with a new name leaving the original in place). Can anyone tell me how to do this reliably with Processing on Windows - from what I've read it seems that this can be a bit of a hack even in Java proper.

TIA

Paul.

I need to get a 180 degree rotated copy of an image, ie. so image2 contains image1 upside down - what's the most efficient way of doing this?

The options I have so far are:

1 Mundane pixel by pixel copy
2 Transformation and scale with negative parameters (as per http://processing.org/discourse/beta/num_1203607253.html)

Any other suggestions would be appreciated

I'm trying to revamp an ugly old finite state machine that has lots of if/then and switch statements and I'd like to make it more object oriented. This is what I'm trying to achieve...

"...A more extendible approach is to set up a basic State class, and a set of specific states which inherit
their structure from the basic State class. At any time an AI agent has a state attached to it, when a
transition occurs, the state is replaced with the new state."

In C I would imagine function pointers would do the trick nicely; how can I emulate that using classes in Processing? Any help appreciated (especially in simplest terms )

Assuming I have something like the code below, and I'm updating point[10] I'd like to be able to access other instances of point[], eg. point[6]. Can I /should I do this by passing the index of the object to the update() method or should I just move update() out of the class altogether (which seems self-defeating)? What if I need access to an unkown number of instances so can't define the parameters in advance?

TIA for helping me improve my OOP


class MyClass{
      float fX, fY;

      float update(){

            //access other instances here
            //eg updating point[10] but need to access point[6] and possibly others!
      }
}

MyClass[] point = new MyClass[20];

I have a very simple program that draws a bunch of lines and grabs part of the screen into a newly created image (around 200x200 pixels).

When exported to Javascript it works the same except the image seems to be of reduced quality.

I've tried the 'crisp' directive to see if that has any effect but it doesn't. No other drawing primitives are used except line (along with stroke() and strokeWeight() ) .

The image is created thus:
minipatt=createImage(16 * CELLSIZE, 16 * CELLSIZE, RGB);

and contents obtained with:
minipatt=get(0, 0, 16 * CELLSIZE, 16 * CELLSIZE);

Any suggestions please?

This code doesn't  seem to work in the latest Beta (released today), I think it did in the old version. I've tried in latest Win 32 and 64 bit versions....can anyone confirm this please?

void draw(){
 
  if ((mousePressed) && (mouseButton==RIGHT)){
    
    exit();
  }
 
}