Subclassing java.awt.Rectangle

nylki

Hi, I thought I would subclass Rectangle to create a button class, because Rectangle provides some usefull functions. Unfortunately, Rectangle uses the variables width and height. Is there a way to access the processing global width and height from inside a Rectangle subclassed object?

So far, when accessing width I won't get the window width, but the width of the rectangle (which i thought was only accessible with this.width). How can i access them properly? Or is there an alternative way to subclass than:

class GuiElement extends java.awt.Rectangle{
  GuiElement(int x_, int y_, PImage img, PImage hoverImg, Integer width_, Integer height_) {
    super(x_, y_, width_, height_);
    pixelImage = img;
    pixelHoverImage = hoverImg;
    vectorImage = null;
  }
}

thanks for any pointers!

PhiLho

Modern coding practice advice to avoid sub-classing in favor of composition.

Ie. let your GuiElement not to be a Rectangle, but rather to hold a Rectangle field, to manage its geometrical needs.

class GuiElement {
  java.awt.Rectangle geometry;

  GuiElement(int x_, int y_, PImage img, PImage hoverImg, Integer width_, Integer height_) {
    geometry = new java.awt.Rectangle(x_, y_, width_, height_);
    pixelImage = img;
    pixelHoverImage = hoverImg;
    vectorImage = null;
  }
}

For the record, there is still a way to access the original enclosing class' members:

void setup()
{
  size(800, 800);

  Elt e = new Elt();
  println(e.get());
}

class Elt
{
  int width;

  Elt()
  {
    width = 10;
  }

  int get()
  {
    return TheSketchName.this.width;
  }
}

TheSketchName is the name under which you saved the sketch, it is the name of this sub-class of PApplet.

nylki

Thanks for clarification! Using a separate object to hold the geometry was actually the second approach I thought about implementing.

GoToLoop

Additional tips:

When extending a class, be aware that field and method names can possibly clash w/ the 1s from Processing! (~~)
In your case, Processing's own width & height fields were overshadowed by the 1s provided by Rectangle class
inside your new sub-class! >:)

Anyways, a Processing's sketch extends PApplet class. That's where all those methods & fields come from! :bz
And any classes we create, by default, are inner nested classes from the main sketch; which is the top-class! :@)

nylki

GoToLoop:

When extending a class, be aware that field and method names can possibly clash w/ the 1s from Processing!

I was aware of that, hence my initial question :)

But thanks for the further details. Will keep that in mind. btw. nice halloween outfit :P