Re: integers and arrays in Java - how?

On Thu, 30 Mar 2006 10:20:56 GMT, Robert Baer
<robertbaer@xxxxxxxxxxxxx> wrote:

I used Google and found some references for integer in Java.
But "int" not only does not work, it also prevents reading X and Y
coordinates of the mouse.
What i would like to do:
1) Get X and Y mouse coordinates into a variable that i can do real math on.
So far, i can do math on the values "read" and that result goes into
a "variable" that is useful *only* for display.
If i try "int" in that math, the values are then zero for everything
- even those where i do no calculation.
2) Use the calculated integer values as an index to a table or array.
It is acceptable to use an HTML "table" as the source for the lookup;
W(CalcFromX) and P(CalcFromX) would be the resulting values to be
displayed on the screen somewhere.

Can this be done, and eXactly how?

I'm taking a broad guess here, seeing as how your description is
vague, but...what you probably want is something along the lines of
this:

public MyClass implements MouseMotionListener {

// constructors and other methods...

// MouseMotionListener methods
public void mouseMoved(MouseEvent e) {
Point p = e.getPoint();
doSomeCalculation(p);
}

public void mouseDragged(MouseEvent e) {
/* more stuff here if necessary */
}

}

Alternatively, if called from within a class that extends some
subclass of java.awt.Component:

public MyClass extends JFrame {

public MyClass( /* parameters */) {
addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent e) {
Point p = e.getPoint();
doSomeCalculation(p);
}
public void mouseDragged(MouseEvent e) {
/* ... */
}
});
}

}

The doSomeCalculation(Point p) method could provide, say, a mapping
from regions to elements of a table, e.g. with the java.awt.Rectangle
contains() method.

Hope this helps; if not, you might want to be more specific!

Evan Stratford
1B CompSci/SoftEng option
University of Waterloo
.

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