Displaying overlapping card hand

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Paul Carey - 11 Dec 2003 10:24 GMT

Hi

I'd like to display a hand of playing cards in a fan shape with the
cards overlapping one another. The cards will need to be able to
respond to mouse clicks. If the mouse is over two cards, only the card
that's visible should receive MouseEvents. I was wondering if anyone
could suggest how I might approach this.

A couple of possibilities occured to me, but I'm not sure how
reasonable/unreasonable they are:
- Represent the Cards by subclassing Image, adding a z-index variable
and have my subclass implement MouseAdapter. Display the cards on a
JComponent, performing AffineTransformations as necessary on the
Cards. I'm not sure how easy it will be to detect when the mouse is
over a card that's been rotated though.

- Create a JLabel with an ImageIcon for a card, add the JLabel to a
JPanel. This works as a represntation for a card, but I don't know if
it's possible to skew or rotate a JPanel?

Any ideas would be very welcome
Thanks

Paul

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Roedy Green - 11 Dec 2003 22:09 GMT

>- Represent the Cards by subclassing Image, adding a z-index variable
>and have my subclass implement MouseAdapter. Display the cards on a
>JComponent, performing AffineTransformations as necessary on the
>Cards. I'm not sure how easy it will be to detect when the mouse is
>over a card that's been rotated though.

To figure out which card has been hit, it will be up to you to process
the mouse click event. I would pre-compute the co-ordinates the
rotated bounding rectangle for each card, and check the cards in
order, top most first to see if the click point was inside.

I vaguely recall a deprecated "inside" method in some class for
helping you do this.

--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Paul Carey - 12 Dec 2003 11:51 GMT

> >- Represent the Cards by subclassing Image, adding a z-index variable
> >and have my subclass implement MouseAdapter. Display the cards on a
> >JComponent, performing AffineTransformations as necessary on the
> >Cards. I'm not sure how easy it will be to detect when the mouse is
> >over a card that's been rotated though.

> I vaguely recall a deprecated "inside" method in some class for
> helping you do this.

Thanks Roedy. I looked it up in the index, it's been replaced by
contains(...) which is implemented by Polygon.

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Jan Schaefer - 12 Dec 2003 11:27 GMT

Paul Carey schrieb:

> I'd like to display a hand of playing cards in a fan shape with the
> cards overlapping one another. The cards will need to be able to
> respond to mouse clicks. If the mouse is over two cards, only the card
> that's visible should receive MouseEvents. I was wondering if anyone
> could suggest how I might approach this.

I did it this way in my card game:

- make a panel holding all cards (FlowLayout)
- set setHgap to 0
- make a panel for each card and
overwrite paintComponent-method of each panel
to add the image for this card
- set preferredSize for each panel
if card should be overlapped make preferredSize smaler
if card is fully visible make preferredSize == image size
- add all card panels to the holding panel

Now you have every card in it's own panel that can catch mouse clicks.

I can post some source code if you want...

So long,

Jan

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Displaying overlapping card hand

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