Re: cry uncle :)

[Pavel Cisler <pavel eazel com>]

Billy,

I think the problem is that you are using an unallocated GdkColor. You
need to use gdk_color_alloc on your white and black to make them mapped
into the color map properly, for instance like so:

	GdkColormap *colormap;
	colormap = gtk_widget_get_colormap (widget);			
	gdk_colormap_alloc_color (colormap, &white, TRUE, TRUE);

I suggest you use gdk_rbg colors instead, they don't need to be mapped
and are easier to deal with:

somewhere in your app init:

	gdk_rgb_init();

...
	guint32 white = 0x00ffffff;
	guint32 black = 0x00000000;
	gdk_rgb_gc_set_foreground(gc, white);


Hope this helps.

Pavel

> 
> I ask about drawing to a drawing area yesterday and got 2 responses that
> stated to change the color of a gc and pass it into the draw_rectangle
> function.
> 
> I give I'm unable to do this :(  I spent 3 hours in the documentation
> and the examples provided with tkg and cannot get anything to show up.
> 
> My target  platform is a SUN,  I'm developing on winders at home (its
> avoids executing across my ISDN line)
> 
> Heres a snippett of my code :
> #include "extern.h"
> 
> /* recursive because of my data structure */
> /* after calling this function I emit signal expose_event */
> void draw_cell(cell_p cell  /* cell_p */
>                ,int view    /* view */
>                ,int trans_x /* translate x */
>                ,int trans_y /* translate y */
>               )
> {
>   node_p          np,detail,strct;
>   point_t         pts[50000];
>   int             npts;
>   GdkColor        white  = {0,0,0,0};
>   GdkColor        black  = {0,0xFFFF,0xFFFF,0xFFFF};
>   GdkGC           *gc    = NULL;
> 
>   if (cell EQ NULL) return;
>   if (gc EQ NULL) gc = gdk_gc_new(pixmap);
>   fprintf(stderr,"Enter draw_cell\n");
>   detail  = NodeFind(cell->head,lDETAIL);
>   strct   = NodeFind(cell->head,lSTRUCT);
>   np = LaffNodeNext(detail,detail);
>   while (np)
>   {
>     switch (np->type)
>     {
>     case lRECT:
>       {
>         rect_p r = (rect_p) np->data;
>         pts[0].x = r->ll.x;
>         pts[0].y = r->ll.y;
>         pts[1].x = r->ur.x;
>         pts[1].y = r->ur.y;
>         /* converts database coords to grachic coords applying scale and
>            shiftx and shifty */
>         Wc2Gc(db,pts,cell,canvas_y,scale,shiftX,shiftY);
>         Wc2Gc(db,&pts[1],cell,canvas_y,scale,shiftX,shiftY);
>         gdk_gc_set_foreground(gc,&white);
>         gdk_draw_rectangle (pixmap
>                             ,gc
>                             ,FALSE
>                             ,pts[0].x
>                             ,pts[0].y
>                             ,ABS(pts[0].x - pts[1].x)
>                             ,ABS(pts[1].y - pts[1].y));
>         fprintf(stderr,"Enter draw_cell : lRECT\n");
>         break;
>       }
>     }
>     np = LaffNodeNext(np,detail);
>   }
>   fprintf(stderr,"Leave draw_cell\n");
> }
> 
> Also how do I set the drawing mode for the DC
> XOR, OR ...
> 
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