Re: Pixmaps AGAIN .... PLEASE HELP!!! (SOLUTION)

[Julio Pastrana <pastrana informatik uni-freiburg de>]

Hello gtk list!!!

After several days traying to achieve transparency  I did it!!!
I DO NOT KNOW if it is a very optimal solution but it works for me.

I wrote a working example { at least in my computer =) }  and I want to
share it with you, I hope this helps some one.


Regards,
Julio C. Pastrana.



ps.-  If you know a better way to do this ... please tell me!
ps2.- Thanks to all the people that gave me hints.



//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////

#include <gtk/gtk.h>
#include <stdlib.h>




void close_application( GtkWidget *widget, GdkEvent
*event, gpointer data ) {
    gtk_main_quit();
}

int main (int argc, char *argv[])
{
      GtkWidget *window, *pixmap;
      GdkPixmap *bk_pixmap,  *p;


        GdkColor *color;
        GdkGC *gcc;
        GdkGC *gccc;
        GdkGC *gc;
        GdkColor white;
        GdkColor black;
        GdkColor red;
        GdkPixmap *xpm;
        GdkFont *label_font=NULL;

        GtkWidget *vbox1;


    int sizeX = 300;
    int sizeY = 300;


    gtk_init (&argc, &argv);

    window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
    gtk_signal_connect (GTK_OBJECT (window), "delete_event",
                        GTK_SIGNAL_FUNC (close_application), NULL);
    gtk_widget_show (window);



    vbox1 = gtk_vbox_new (FALSE, 0);
    gtk_widget_set_name (vbox1, "vbox1");
    gtk_widget_ref (vbox1);
    gtk_object_set_data_full (GTK_OBJECT (window), "vbox1", vbox1, (GtkDestroyNotify) gtk_widget_unref);
    gtk_container_add (GTK_CONTAINER (window), vbox1);
    gtk_widget_show (vbox1);


        /*Just to define a color*/
          gcc = gdk_gc_new(window->window);
          color = (GdkColor *) malloc(sizeof(GdkColor));
          color->red = 0;
          color->green = 0xffff;
          color->blue = 0;
          color->pixel = (gulong)(0);
          gdk_color_alloc(gtk_widget_get_colormap(window),color);
        /*________________________________________________________*/


    bk_pixmap =  gdk_pixmap_new ( window->window,sizeX, sizeY, -1);
    gdk_gc_set_foreground (gcc, color);
    gdk_draw_rectangle ( bk_pixmap, gcc, TRUE,0, 0,sizeX,sizeY);

        /* setting a Pixmap as the Background of my window*/
    gtk_widget_set_app_paintable(window, TRUE);
    gdk_window_set_back_pixmap(window -> window,bk_pixmap, 0);



         gdk_color_parse("white", &white);
         gdk_color_alloc(gtk_widget_get_colormap(window),&white);

         gdk_color_parse("black", &black);
         gdk_color_alloc(gtk_widget_get_colormap(window),&black);

         gdk_color_parse("red", &red);
         gdk_color_alloc(gtk_widget_get_colormap(window),&red);



           p =  gdk_pixmap_new ( window->window, sizeX,sizeY, -1);  //color pixmap
           xpm = gdk_pixmap_new ( NULL, sizeX, sizeY,1);   // one color pixmap (It is actually a BITMAP)


           gc = gdk_gc_new(xpm); // getting the gc for the bitmap
           gdk_gc_set_foreground(gc, &black);
           gdk_draw_rectangle(xpm, gc, TRUE, 0,0, sizeX,sizeY);
           gdk_gc_set_foreground(gc, &white);


                  /* everything you draw you have to draw it on the mask also */
                 /* just with the white color */
                  gccc = gdk_gc_new(p);
                  gdk_gc_set_background(gccc, &white);
                  gdk_draw_rectangle(p, gccc, TRUE, 0,0,  sizeX,sizeY);


                  gdk_gc_set_foreground(gccc, &white);
                  gdk_draw_rectangle(p, gccc, TRUE, 100,100, 100,100);
                  gdk_draw_rectangle(xpm, gc, TRUE, 100,100, 100,100);


                  gdk_gc_set_foreground(gccc, &red);
                  gdk_draw_rectangle(p, gccc, FALSE, 30,30, 100, 100);
                  gdk_draw_rectangle(xpm, gc, FALSE, 30,30, 100,100);


                  gdk_gc_set_foreground(gccc, &red);
                  gdk_draw_rectangle(p, gccc, TRUE, 200,50, 50,50);
                  gdk_draw_rectangle(xpm, gc, TRUE, 200,50, 50,50);

                  gdk_gc_set_foreground(gccc, &black);
                  gdk_draw_arc(p , gccc, FALSE, 200, 200 , 60, 60,  0, 64 * 360);
                  gdk_draw_arc(xpm , gc, FALSE, 200, 200 , 60, 60,  0, 64 * 360);


                  label_font = gdk_font_load("-*-helvetica-*-r-normal-*-14-*-*-*-*-*-*-*");
                  char * text = "Example  =) ";

                  gdk_draw_string(p , label_font , gccc , 30, 250, text);
                  gdk_draw_string(xpm , label_font , gc , 30, 250, text);


         pixmap = gtk_pixmap_new( p, xpm);
         gdk_pixmap_unref(p);
         gdk_pixmap_unref(xpm);
         gtk_container_add( GTK_CONTAINER(vbox1),  pixmap);
         gtk_widget_show( pixmap );


       gtk_widget_show( pixmap );

    gtk_main ();

    return 0;
}



///////////////////////////////////////////////////////////////////////////////////////////////////