//==========================================================================
// 		FeigenSound  v. 1.0
//
//  	Logistische Gleichung als Sound-Generator.
//
// 	written by Peter Schmitteckert
//	email: peter@schmitteckert.com
//
//	This source may be distributed, changed or deleted without any restriction.
//	Comments are welcome
//
//==========================================================================
//
//	Should run on every decent X11, testet on  "Linux baxter 2.2.17-RAID"
//	Compile: g++ FeigenSound.C -I /usr/X11/include/X11  -o FeigenSound -L/usr/X11/lib -lX11
//
//	It runs under X, so you can even run it on a server, using your local PC-Speaker. :)
//
//==========================================================================

#include <Xlib.h>
#include <stdlib.h>
#include <unistd.h>
#include <iostream>
using namespace std;

void Beep( Display* pDisplay, const int Frequency, const int Duration)
{
	XKeyboardState OldState;
	XKeyboardControl KbdCtl;

	XGetKeyboardControl(pDisplay, &OldState);

	// switch to new state
	KbdCtl.bell_percent = 100;
	KbdCtl.bell_pitch = Frequency;
	KbdCtl.bell_duration = Duration;
	XChangeKeyboardControl( pDisplay, KBBellPercent | KBBellPitch | KBBellDuration, &KbdCtl);

  	// ring bell
  	XBell( pDisplay,100);

  	// restore old state
  	KbdCtl.bell_percent = OldState.bell_percent;
  	KbdCtl.bell_pitch = OldState.bell_pitch;
  	KbdCtl.bell_duration = OldState.bell_duration;
	XChangeKeyboardControl( pDisplay, KBBellPercent | KBBellPitch | KBBellDuration, &KbdCtl);
}

int main( int argc, char* argv[])
{
	double FrequencyFactor = 1000;
	int Duration = 100;  // in ms.
	double a=3.7;
	double x = 0.5;
	bool bOk = true;

	// Initialisiere Display auf aktuelle Display
	Display* pDisplay;
	pDisplay = XOpenDisplay( NULL);

	if( argc > 4)
	{
		bOk = false;
	}

	if( argc > 1)
		a = atof( argv[1] );

	if( (a<1.0) || (a>4.0) )
	{
		cout << " a muß zwischen 1.0 und 4.0 liegen." << endl;
		bOk = false;
	}

 	if( argc > 2)
		FrequencyFactor = atof( argv[2] );

	if( (FrequencyFactor<1.0) || (FrequencyFactor>10000.0) )
	{
		cout << " Der Frequenz-Factor muß zwischen 1.0 und 10000 liegen." << endl;
		bOk = false;
	}


 	if( argc > 3)
		Duration = atoi( argv[3] );

	if( (Duration<1.0) || (Duration>10000) )
	{
		cout << " Die Tondauer FrequencyFactor muß zwischen 1.0ms  und 10000ms liegen."<< endl;
		bOk = false;
	}

	if( !bOk)
		cout << "Usage: " << argv[0] << " [a] [FrquenzFactor] [ Dauer ] " << endl;

	// FeigenBaum - Schleife
	while(bOk)
	{
	 	x = a * x * (1.0 - x);
		if( ( x<=0) || ( x>=1.0) )
			break;

		Beep( pDisplay, int(FrequencyFactor*x), Duration);

		// Warten auf das ende des Beep + etwas Pause (usleep(x) wartet x µ-sekunden)
		usleep( 1100 * Duration);
		cout << x << endl;
	};

	cout << "Closing Display" << endl;

	// Schliesse Display
	XCloseDisplay( pDisplay);
}