drawing a line

[Shiraz Baig <shiraz_baig yahoo com>]

Hi,
I want to draw a line when I push a button. I have
written the following code. It draws line thru two
alternative signal commands.
a. Thru the timer function.
b. Thru the push button.

It works with the timer function. But it does not work
with the push button. 

Question:
Can anyone suggest how can it draw the line when I
click the button?



#include <gtk/gtk.h>

/************ Draw line function *******************/
gint Repaint (gpointer data)
{
 GtkWidget * drawing_area = (GtkWidget *) data;
 GdkDrawable *drawable;
 drawable = drawing_area->window;
 gdk_draw_line(drawable,                       
               drawing_area->style->black_gc,
               100,100,150,150);
}//end of Repaint

/**********************************************/
void quit()
{
 gtk_exit(0);
}

/***************** main *********************/
int main(int argc, char *argv[])
{
 GtkWidget *window;
 GtkWidget *drawing_area;
 GtkWidget *vbox;
 GtkWidget *button;

 gtk_init(&argc, &argv);
 window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 vbox = gtk_vbox_new(FALSE, 0);
 gtk_container_add(GTK_CONTAINER(window), vbox);
 gtk_widget_show(vbox);

 gtk_signal_connect(GTK_OBJECT (window), "destroy",
                    GTK_SIGNAL_FUNC (quit), NULL);

 button = gtk_button_new_with_label("Draw Line");
//ceate button
 gtk_container_add (GTK_CONTAINER(vbox), button);
//contaier for button

 gtk_widget_show(button);
 drawing_area = gtk_drawing_area_new();
 gtk_drawing_area_size(GTK_DRAWING_AREA
(drawing_area), 200, 200);
 gtk_box_pack_start(GTK_BOX(vbox), drawing_area, TRUE,
TRUE, 0);


 gtk_widget_show(drawing_area);

 gtk_widget_show(window);
 
 /********** timer signal ************/
// gtk_timeout_add(1000, Repaint, (gpointer)
drawing_area); 

 /********* button signal  ************/
 gtk_signal_connect(GTK_OBJECT(button), "clicked",    
 
               GTK_SIGNAL_FUNC (Repaint), (gpointer)
drawing_area);

 gtk_main();
 
} //end of main


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