[Pgui-devel] Try to use PG_GROP_SETCLIP

[Olivier Bornet]

Hello,

It seems the PG_GROP_SETCLIP is not working (at least for
PG_WIDGET_CANVAS). (After a very quick look in the pgserver source, I
suspect it is not implemented).

Also, using PG_GROP_RECT and PG_GROP_LINE results of a 1 pixel
difference.

See the attached example where the black X is for testing the clip, and
the red + for showing the 1 pixel difference.

Thanks in advance.

                Olivier
-- 
Olivier Bornet                      SMARTDATA SA
[EMAIL PROTECTED]         Centre du Parc
http://www.smartdata.ch             av. des Pr�s-Beudin 20
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#include <picogui.h>

#define X        50
#define Y        50
#define W        50
#define H        50
#define DELTA    20

#define RED   0x00FF0000
#define GREEN 0x0000FF00
#define BLUE  0x000000FF
#define BLACK 0x00000000
#define WHITE 0x00FFFFFF

int main(int argc,char **argv) {
   pghandle w;

   /* init */
   pgInit( argc, argv );
   pgRegisterApp( PG_APP_NORMAL, "Canvas Clip", 0 );
   w = pgNewWidget( PG_WIDGET_CANVAS, 0, 0 );
  
   /* draw a rectangle representing the clip */
   pgWriteCmd( w, PGCANVAS_GROP, 2, PG_GROP_SETCOLOR, BLUE );
   pgWriteCmd( w, PGCANVAS_GROP, 5, PG_GROP_RECT, X, Y, W, H );

   /* active the clip */
   pgWriteCmd( w, PGCANVAS_GROP, 5, PG_GROP_SETCLIP, X, Y, W, H );

   /* draw a X wich go outside the clip region */
   pgWriteCmd( w, PGCANVAS_GROP, 2, PG_GROP_SETCOLOR, BLACK );
   pgWriteCmd( w, PGCANVAS_GROP, 5, PG_GROP_LINE,
               X - DELTA, Y - DELTA,
               W + 2 * DELTA, H + 2 * DELTA );
   pgWriteCmd( w, PGCANVAS_GROP, 5, PG_GROP_LINE,
               X - DELTA, Y + H + DELTA,
               W + 2 * DELTA, -( H + 2 * DELTA ));

   /* draw a + excactly in the region */
   pgWriteCmd( w, PGCANVAS_GROP, 2, PG_GROP_SETCOLOR, RED );
   pgWriteCmd( w, PGCANVAS_GROP, 5, PG_GROP_LINE, X + W / 2, Y, 0, H );
   pgWriteCmd( w, PGCANVAS_GROP, 5, PG_GROP_LINE, X, Y + H / 2, W, 0 );

   /* main loop */
   pgEventLoop();

}