import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.awt.geom.*;
import java.math.*;


public class PinwheelComputer {
    public PinwheelComputer() {}

    /**This is the basic routine*/

    public static int pinwheelProbe(PolyWedge P,Complex z,int n,int start) {
	EnhancedComplex E0=new EnhancedComplex(z,start);  
	EnhancedComplex E1=new EnhancedComplex(E0);
	E1=BilliardsMap.nextPoint2(E1,P);
	EnhancedComplex E2=new EnhancedComplex(E0);
	EnhancedComplex E3=StripMap.oneStepMap(P,E2);
	if(EnhancedComplex.equals(E2,E3)==1) return(0);  //rules out trivial first step
	E3.z=new Complex(-99999,0);
	for(int i=0;i<n;++i) {	
	   if(i==n-2) E3=new EnhancedComplex(E2); 
                     E2=StripMap.oneStepMap(P,E2);
	}
	if(EnhancedComplex.equals(E2,E3)==1) return(0);  //rules out trivial last step
	double test=Complex.dist(E1.z,E2.z);
	if(test<.000001) return(1);
	return(0);
    }

    public static int[] pinwheelProbe(PolyWedge P,Complex z) {
	int test=0;
	for(int n=1;n<30;++n) {
	    for(int start=0;start<P.count;++start) {
		test=pinwheelProbe(P,z,n,start);
		if(test==1) {  
		    int[] X={start,n};
		    return(X);
		}
	    }
	}
	return(null);
   }

}