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//   Program wing
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#include "nxgraph.h"

//---- graphics setting
const int WIN_WIDTH  = 256;
const int WIN_HEIGHT = 256;

//---- experimental setting
const int N_MAX      = 4096;

//---- main function
int main(void)
{
  NXOpenWindow( "Chaos", WIN_WIDTH, WIN_HEIGHT );
  NXSetColor( NX_FOREST );

  const double a = -1.57, b = 0.96, c= -4.00, d = 5.0;
  double x = 1.0, y = 0.0;

  for( int n=0; n<N_MAX; n++ ){
    NXDrawPoint( (int)(8*x)+WIN_WIDTH/2, (int)(8*y)+WIN_HEIGHT/2 );

    double nx;
    nx = a*x + b*y + c + d/(1.0+x*x);
    y  = -x;
    x  = nx;
  }

  NXPause();
  NXCloseWindow();
  return 0;
}