tkinter create_line

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

static gboolean on_draw_event(GtkWidget widget, cairo_t cr, gpointer user_data)
{
    // Draw a line from (10, 10) to (100, 100)
    cairo_move_to(cr, 10, 10);
    cairo_line_to(cr, 100, 100);
    cairo_stroke(cr);

    return FALSE;
}

int main(int argc, char *argv[])
{
    GtkWidget *window;
    GtkWidget *darea;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    darea = gtk_drawing_area_new();
    gtk_container_add(GTK_CONTAINER(window), darea);

    g_signal_connect(G_OBJECT(darea), "draw", G_CALLBACK(on_draw_event), NULL);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
}