Re: [gtk-list] Re: how to change the color of a GdkGC

[Robert Aragon <bobbya redshift com>]

BTW,

How do you get a program to compile?

Robert A.

>
>  Here's how I do it.  Not necessarily the optimum way, but it works for
>me.  
>  
>  I've removed most of my program for simplicity, so the Demo() part
>might 
>act funky; not refresh right, etc.  But everything else is tested. 
>  
>  John
>  
>#include <gtk/gtk.h> 
>#include <stdio.h> 
>#include <stdlib.h> 
>#include <malloc.h> 
>  
>   /* global variables - color palatte */ 
>   GdkGC *red, *green, *blue, *purple; 
>
>   void DefColor(GtkWidget *widget,
>      GdkGC **gc,char redbyte,char greenbyte,char bluebyte)  
>   /* **********************************************************  
>   *   Define a single new color for *gc. 
>   ********************************************************** */ 
>   {        
>      GdkColor color; 
>   
>     /* first, create a GC to draw on */ 
>      *gc = gdk_gc_new(widget->window); 
>   
>      color.red = redbyte * (65535/255);  
>      color.green = greenbyte * (65535/255);  
>      color.blue = bluebyte * (65535/255); 
>      color.pixel = (gulong)(redbyte*65536 + greenbyte*256 + bluebyte); 
>      gdk_color_alloc(gtk_widget_get_colormap(widget), &color); 
>      gdk_gc_set_foreground(*gc, &color); 
>   }/* DefColor */ 
>
>   void DefColors(GtkWidget *widget) 
>   /* ********************************************************** 
>   *  Define a set of five colors, call only once at the 
>   * start of the program. 
>   ********************************************************** */ 
>   { 
>      DefColor(widget,&red,250, 0, 0); 
>      DefColor(widget,&green,0,250,0); 
>      DefColor(widget,&blue,0,0,255); 
>      DefColor(widget,&purple,125,0,125); 
>      DefColor(widget,&orange,125, 50, 0);
>   }/* DefColors */
>
>   void FreeColors() 
>   /* **********************************************************  
>   * dispose of all colors at end of program.
>   ********************************************************** */ 
>   { 
>      free(red); free(green); free(blue); free(orange);
>   }/* FreeColors */ 
>
>   
>   void Demo(GtkWidget *widget)
>   /* **********************************************************  
>   * Call this to demo the above functions; draw on a widget.
>   ********************************************************** */ 
>   {
>     DefColors(widget); 
>
>     /* fill the widget with a big red rectangle */
>     gdk_draw_rectangle (widget->window, red, TRUE, 
>            0, 0, widget->allocation.width, widget->allocation.height); 
>
>     /* and a blue line too, for fun. */
>     gdk_draw_line(widget->window, blue,1,1,10,21); 
>     FreeColors();
>   }/* Demo */
>
>
>
>___________________________________________________________________
>Get the Internet just the way you want it.
>Free software, free e-mail, and free Internet access for a month!
>Try Juno Web: http://dl.www.juno.com/dynoget/tagj.
>
>-- 
>To unsubscribe: mail -s unsubscribe gtk-list-request@redhat.com < /dev/null
>
>