🚀 go-pugleaf

David Vásquez Estrada wrote:
> 
> nlaan wrote:
> 
> > Sorry, my mistake the correct method is used as followed:
> >
> > public void paint(Graphics g)
> > {
> >     FontMetrics fm = g.getFontMetrics();
> >
> >     int width = fm.stringWidth("Hello World");
> >
> >     int height = fm.getHeight();
> > }
> >
> 
> Should I override the method paint of "some" kind of class or I can get an
> instance of the Graphics class, since the graphics class is also an abstract
> class.

There are a number of ways to get what you want without
having access to a graphics context as in the example above.
Assuming a JLabel called 'myLabel':

   FontMetrics fm = myLabel.getFontMetrics(myLabel.getFont());

   int width = fm.stringWidth(myLabel.getText());

   // etc.

You can even grab a graphics context

   Graphics g = myLabel.getGraphics();
   FontMetrics fm = g.getFontMetrics(myLabel.getFont());
   // ...

However, when you are done with this, call

   g.dispose(); 

I forgot about doing this in a library I recently wrote and someone
wasn't very happy when he found a big memory leak!  Oops, it
just sort of slipped my mind ....

But don't call 'g.dispose()' in a method which gets its 'g' as a method
parameter.  You do that, and boom, any code which shares that graphics
context ends up trying to work with a null pointer.


Paul Furbacher  (TeamB)