/** setgc.c **/
#include <gnome.h>

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gboolean eventDraw(GtkWidget *widget,
        GdkEvent *event,gpointer data);
static GdkGC *functionCreateGC(GdkWindow *window);
static GdkGC *valueCreateGC(GdkWindow *window);

#define WIDTH 300
#define HEIGHT 100

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *area;

    gnome_init("setgc","1.0",argc,argv);
    app = gnome_app_new("setgc","Setting GdkGC Values");
    gtk_signal_connect(GTK_OBJECT(app),"delete_event",
            GTK_SIGNAL_FUNC(eventDelete),NULL);
    gtk_signal_connect(GTK_OBJECT(app),"destroy",
            GTK_SIGNAL_FUNC(eventDestroy),NULL);

    area = gtk_drawing_area_new();
    gtk_widget_set_usize(area,WIDTH,HEIGHT);
    gnome_app_set_contents(GNOME_APP(app),area);
    gtk_signal_connect(GTK_OBJECT(area),"event",
            GTK_SIGNAL_FUNC(eventDraw),area);

    gtk_widget_show_all(app);
    gtk_main();
    exit(0);
}
gboolean eventDraw(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    GdkGC *gc;
    GtkWidget *area;

    area = GTK_WIDGET(data);

    gc = functionCreateGC(area->window);
    /****
    gc = valueCreateGC(area->window);
    ****/

    gdk_draw_line(area->window,
            gc,
            20,HEIGHT/2,
            WIDTH-20,HEIGHT/2);
    return(TRUE);
}
static GdkGC *functionCreateGC(GdkWindow *window)
{
    GdkGC *gc;
    GdkColormap *colormap;
    GdkColor foreground;
    gchar dash[2] = { 1, 20 };
    
    gc = gdk_gc_new(window);

    colormap = gdk_colormap_get_system();
    if(gdk_color_parse("white",&foreground)) {
        gdk_color_alloc(colormap,&foreground);
        gdk_gc_set_foreground(gc,&foreground);
    }
    gdk_gc_set_line_attributes(gc,
            15,
            GDK_LINE_ON_OFF_DASH,
            GDK_CAP_ROUND,
            GDK_JOIN_MITER);
    gdk_gc_set_dashes(gc,0,dash,2);

    return(gc);
}
static GdkGC *valueCreateGC(GdkWindow *window)
{
    GdkGC *gc;
    GdkColormap *colormap;
    GdkColor foreground;
    gchar dash[2] = { 1, 20 };
    GdkGCValues values;

    colormap = gdk_colormap_get_system();
    if(gdk_color_parse("white",&foreground))
        gdk_color_alloc(colormap,&foreground);
    values.foreground = foreground;
    values.line_width = 15;
    values.line_style = GDK_LINE_ON_OFF_DASH;
    values.cap_style = GDK_CAP_ROUND;
    values.join_style = GDK_JOIN_MITER;

    gc = gdk_gc_new_with_values(window,&values,
            GDK_GC_FOREGROUND | GDK_GC_LINE_WIDTH |
            GDK_GC_LINE_STYLE | GDK_GC_CAP_STYLE | 
            GDK_GC_JOIN_STYLE);
    gdk_gc_set_dashes(gc,0,dash,2);

    return(gc);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}