So I've got a question about classes. Let's say I have an object of another class created inside my main class, also there is a boolean variable:

import processing.core.PApplet;
    public class MainClass extends PApplet {
            MyClass obj;
            boolean variable;

        public static void main(String[] args) {
            PApplet.main("MainClass");

        }

        public void settings() {
            size ( 1280, 720);
        }

        public void setup() {
             obj = new MyClass(this);
        }

        public void draw() {

        }
    }

Then there is another class which, if it was created in Processing app, would see both "obj" and "variable", but in Eclipse it doesn't recognise them:

import processing.core.PApplet;

public class AnotherClass{
  PApplet parent;

  public AnotherClass( PApplet p) {
      parent = p;

  }
  void update() {
         variable = true; 
         obj.doSomething();
  }
}

How can I, in a not very complicated way, make "AnotherClass" recognise both " obj" and "variable" in a similar manner to how it happens in Processing app? Thanks in advance!

ArrayList<Entity> entities;
void setup() {
  size(500, 500);
  entities = new ArrayList <Entity>();
  entities.add(new Sign("Hello!", 200, 64));
}
void draw() {
  background(0);
  println(entity.get(0).Sign.text); // WHY ? HOW TO GET VARIABLE FROM SIGN?
  for (Entity entity : entities) {
    entity.show();
    entity.handle();
  }
}


public class Sign extends Entity {
  String text;
  public Sign(String text, int mapX, int mapY) {
    super(mapX, mapY, 14, 8);
    this.text = text;
  }
  void show() {
    noStroke();
    fill(80);
    rectMode(CORNER);
    rect(xPos, yPos, w, h);
    stroke(0);
    line(xPos + 2, yPos + 2, xPos + w - 3, yPos + 2);
    line(xPos + 2, yPos + 5, xPos + w - 3, yPos + 5);
  }

  void handle() {
      textAlign(CENTER, CENTER);
      fill(255);
      text(text, xPos, yPos-32);
  }
}

public abstract class Entity extends GameObject {
  public Entity(int xPos, int yPos, int w, int h) {
    this.xPos = xPos;
    this.yPos = yPos;
    this.w = w;
    this.h = h;
  }
  abstract void show();
  abstract void handle();
}

public abstract class GameObject {
  int xPos, yPos;
  int w, h; 
  abstract void show();
}

(edit was just to make the text fit better)

                int y = 100;
                int speed = 3;
                float size = 50;

            void setup(){
              size(500,500);
              stroke(0);
              fill(175);
            }
            void draw(){
              background(255);
              y+= speed;
              if ((y>500) || (y<0)) {
                speed = speed * -1;
              }
              ellipse(y, y,size, size);
            } 
            void mouseReleased(){
              size = random(20,60);
              redraw();
            }

Now, I have found that I can store all of these child objects inside an ArrayList declared ArrayList<Bicycle>. When it comes to scanning through the list, though, I need to differentiate these into their respective classes. Would getClass() still work, or have they been typecasted to Bicycle? I suppose I could always put an enum in the parent class and then typecast them later, but I'd prefer to go with the former option.

    void setup()
    {
      Integer myInteger = 0x23456789;

      println("myInteger in hex=" + hex(myInteger)); // Just using hex()
      println("myHexFromCast =" + hex((int)myInteger, 8)); // hex of an  int cast
      println("myHexFromMethod =" + hex(int(myInteger), 8)); // hex of the int() method
    }

Yeah, I realize (now) that int(myInteger) is wrong given that int() is just for primitive data types, but I would have thought that something somewhere would have yelped in pain that I even tried to do it.

The output I get is: myInteger in hex=23456789 myHexFromCast =23456789 myHexFromMethod =23456780

So no error, but a subtly wrongo result.

If you change the initial value of myInteger to 0x2345FFFF you get:

    myInteger in hex=2345FFFF
    myHexFromCast =2345FFFF
    myHexFromMethod =23460000

It has the hallmarks of either some weird conversion, some kind of binary format issue, with a tad of a rounding error thrown in (rounding for integers?) Or it's just my addled brain with a parity error.

Anyone know what's going on, please?

Andy. :)

void setup() {
}

void draw() {
  for (int i=0; i<1000000000; i++) {
    float var = i;
  }
}

runs about 3 times faster than this

float var;

void setup() {
}

void draw() {
  for (int i=0; i<1000000000; i++) {
    var = i;
  }
}

which is (at least to an ignorant like me) counter-intuitive, because in the first example, variable var is cast a billion times, whereas in the second one, it's merely changed in value. How comes?

In the setup I can pass a string into the .setValue(); and it works but when it comes to the draw I can no longer pass a string into it, it throws an error that says it expects a float.

So the question is why? I can't for the life of me work out why this works then doesn't.

Thanks.

import controlP5.*;

ControlP5 cp5;

String newInput = "boop";

void setup() {
  size(700, 400);

  PFont font = createFont("arial", 20);

  cp5 = new ControlP5(this);

  cp5.addTextfield("Word 1")
    .setPosition(20, 170)
    .setSize(200, 40)
    .setFont(font)
    .setAutoClear(true)
    .setValue(newInput)
    .setColor(255) //text color
    .setColorBackground(0)
    .setCaptionLabel(" ")
    ;

  textFont(font);
}

void draw() {
  background(210);
  newInput = cp5.getController("Word 1").getStringValue();
  cp5.getController("Word 1").setValue(newInput);
  println("NI:" + newInput);
  text(newInput, mouseX, mouseY);
}

Mother mother = new Mother(1) ;
ArrayList<Mother> list_mother = new ArrayList<Mother>() ;

void setup() {
  list_mother.add(mother) ;

  method_list(list_mother) ;
}

void method_list(ArrayList list) {
  for(Object obj : list) {
    if(obj instanceof Mother) {
      println("list Mother") ;
      println(obj.x) ;
    }
  }
}

class Mother {
  int x ;
  Mother(int x) {
    this.x = x ;
  }
}

I'm new to Processing and trying to reverse understand from Python.

I have vTr, an array of 2D vectors, with a single element (the starting coordinates of my object) in it. When I try to append vN (new coordinates) to vTr, I get "Type mismatch, "java.lang.Object" does not match with "processing.core.PVector[]":

xPos = xPos + speed * vP.x;

yPos = yPos + speed * vP.y;

vN = new PVector(xPos, yPos);

vTr = append(vTr, vN); //This underlines in red and delivers the message above.

Does this mean I have to use an ArrayList? The Processing 3.0 page claims append() works with objects.

Thanks for any help!

entitiesList.get(currentEntity.getID()).pickUp();

where pickUp is a function of the subclass weapon; however i cannot do that as i get a, "function doesnt exist" error, now i havent actually tried it but would

weapon temp = (weapon)entitiesList.get(currentEntity.getID()); temp.pickUp();

that work ? would the weapon object created point to the original, or would it be a new object ? if it is the latter, then is there any way i can store the originals in one arraylist and then use two other arraylists to store weapons and tributes as pointers to the original array ?,

e.g.

ArrayList al;

al.add (new Circle(0,0,10)); al.add (new Rect(0,0,10,10));

How can I figure out which class is stored when I iterate through that array?

for (int i=0; i<al.size(); i++) CLASS? obj = (CLASS?) ai.get(i);

I'm currently working on a file library, because it will be handy in future builds. My way of doing this is to make an ArrayList of a class I've made to store information on the file.

long newID; long newID(){return newID++;} //Generates a new ID when called.

class file { //File class. Stores information about a file. String name, type, path; long ID; Object content;

file(String fileName, String filePath){ String temp[] = split(fileName,"."); //Splits the file name into name and type. name = temp[0]; //The name of the file, mostly for file search. path = filePath; //The file path on local machine. ID = newID(); //Generates a new ID for the file, could be handy. type = ""; //Empty means folder

if (temp.length > 1){ type = temp[1].toLowerCase(); //There is a file type, let's assign it. }

} }

To simplify my question: I would like my code to work like this:

file temp = new file("test.png", "C:\\test.png"); temp.content = loadImage(temp.path); image(temp.content, 0, 0, width, height);

The problem is 'temp.content' is not the type PImage, and I don't know a way to make it accepted, without declearing a new temporary PImage which loads the image instead, which is not acctually what I'm after. I want to load all files at launch, and then there should be no need to load them again. I could expand my class to contain all the different types, like PImage, sound, text, but that is just plain messy. I like it clean and simple. This operation works in most languages, so I was hoping so did Processing due to Java.

For those who wonder, I can simply use a if statement on the 'temp.type' to find out if it is a image, sound or whatever it is, so it won't create a runtime error.

Any help would be greatly appreciated, thanks for reading!

EDIT

I'm bad at explaining, but what I meant is I want the 'Object content' to be a variable I can change. Pretty much like: 'content = new PImage' or 'content = new className'. Like it would change the type which content represented. It would be really handy, but not quite sure how to achieve this.

PImage img;
int cellsize=8;
int cols,rows;
void setup() {
 size(200,200,P3D);
 img=loadImage("IMG_6753.jpg");
 surface.setResizable(true);
 surface.setSize(img.width,img.height);
 cols=width/cellsize;
 rows=height/cellsize;

}


void draw() {
  background(0);
  loadPixels();

  for(int i=0; i<cols; i++) {
     for(int j=0; j<rows; j++) {
       int x=i*cellsize+cellsize/2;
       int y=j*cellsize+cellsize/2;
       int loc=x+y*width;
       color c=img.pixels[loc];

       float z=(mouseX/(float)width)*brightness(img.pixels[loc])-10;
       pushMatrix();
       translate(x,y,z);
       fill(c);
       noStroke();
       rectMode(CENTER);
       rect(0,0,cellsize,cellsize);


       popMatrix();



  }


  }



}

    float i,j=0;

    void setup(){
      size(200,200);
    }
    void draw(){
      ellipse(width/2,height/2,i,i);
      ellipse(width/2,height/2,j,j);
      ++i;
      j+=0.5;
    }

I'd like to hold some classes that implements an Interface in the same collection, but if I can't access member fields, then maybe it's useless... What am I doing wrong?

I i ;

void setup() {
  i = new C();
  // throws a cannot be resolved or is not a field
  println(i.x);
}

interface I {
}

class C implements I {
  int x;

  C() {
    x= 0;
  }
}