if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(cylinder->pressure_button))) {
start = gtk_spin_button_get_value(GTK_SPIN_BUTTON(cylinder->start));
end = gtk_spin_button_get_value(GTK_SPIN_BUTTON(cylinder->end));
if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(cylinder->pressure_button))) {
start = gtk_spin_button_get_value(GTK_SPIN_BUTTON(cylinder->start));
end = gtk_spin_button_get_value(GTK_SPIN_BUTTON(cylinder->end));