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

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);

#define WIDTH 400
#define HEIGHT 200

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *canvas;
    GnomeCanvasPoints *points;
    GnomeCanvasGroup *rootGroup;

    gnome_init("canvas","1.0",argc,argv);
    app = gnome_app_new("canvas","Gnome Canvas");
    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);

    canvas = gnome_canvas_new();
    gtk_widget_set_usize(canvas,WIDTH,HEIGHT);
    gnome_canvas_set_scroll_region(GNOME_CANVAS(canvas),
            0.0,0.0,WIDTH,HEIGHT);
    rootGroup = gnome_canvas_root(GNOME_CANVAS(canvas));
    gnome_app_set_contents(GNOME_APP(app),canvas);

    gnome_canvas_item_new(rootGroup,
                      gnome_canvas_rect_get_type(),
                      "x1",(double)10,
                      "y1",(double)10,
                      "x2",(double)(WIDTH - 10),
                      "y2",(double)(HEIGHT - 10),
                      "fill_color","white",
                      "outline_color","black",
                      NULL);

    points = gnome_canvas_points_new(3);
    points->coords[0] = 20;
    points->coords[1] = 20;
    points->coords[2] = WIDTH - 20;
    points->coords[3] = HEIGHT / 2;
    points->coords[4] = 20;
    points->coords[5] = HEIGHT - 20;
    gnome_canvas_item_new(rootGroup,
                    gnome_canvas_line_get_type(),
                   "points",points,
                   "fill_color","black",
                   "width_pixels",2,
                   NULL);
    gnome_canvas_points_free(points);

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