Drag and Drop

SDL Development
1

Hi,

I want to know if any of you has ever programmed a drag and drop
behaviour in something like card games, bacjgammon or chess…

In that case could you please tell me the way you did it and if you
have any source about this (URL, code sample…) it would be greatly
appreciated !

thanx

2

I want to know if any of you has ever programmed a drag and drop
behaviour in something like card games, bacjgammon or chess…

Yes, in http://www.mysterystudio.com/info.php?id=ps

init :
pDragPiece = NULL

on mouse button down :
pDragPiece = Piece under cursor (or a proxy)
Remove piece from board

on update :
if pDragPiece != NULL, draw the piece (or the proxy) under the cursor

on mouse button up :
if pDragPiece != NULL, get the board position under the cursor, try to
execute the move according to the game rules

3

Hi,

You should do something like this:

  • When you get a click event, check if the mouse
    if over a moveable object, say a card. Change into
    grabbing mode;

  • While in grabbing mode, when the user moves
    the mouse, update the object location to reflect the
    movement;

  • When the user releases the mouse button, return
    to normal mouse mode.

The refered normal/grabbing modes are something
that you have to keep track of.

Cheers,
Paulo

squale wrote:>Hi,

I want to know if any of you has ever programmed a drag and drop
behaviour in something like card games, bacjgammon or chess…

In that case could you please tell me the way you did it and if you
have any source about this (URL, code sample…) it would be greatly
appreciated !

thanx

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

4

Another example is at http://drac.sf.net/

It’s a solitaire game, and card game programming framework.On Sep 29, 2004, at 10:54 AM, squale wrote:

Hi,

I want to know if any of you has ever programmed a drag and drop
behaviour in something like card games, bacjgammon or chess…

In that case could you please tell me the way you did it and if you
have any source about this (URL, code sample…) it would be greatly
appreciated !

thanx

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

5

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Hi there

i was wondering, it there was some simple SDL-like trick to get DnD
(Drag and Drop) running, so i can drop some file-links fron
konqueror/MS-Explorer/etc. into my SDL-app??

thanks for any hint in advance
benjamin

visit the worlds most furious open-source 3D-action game
http://www.orxonox.net
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6

Benjamin Grauer wrote:

Hi there

i was wondering, it there was some simple SDL-like trick to get DnD
(Drag and Drop) running, so i can drop some file-links fron
konqueror/MS-Explorer/etc. into my SDL-app??

Maybe this can help you ?

http://www.libsdl.org/projects/scrap/