//
// Autor:    Timo Ehmke (ehmke@ipn.uni-kiel.de)
//


// Figurenbeschreibung 
// ===================

   e[1] = A;	point;	dragable;	 5.7, 6.3;	
   e[2] = B;	point;	dragable;	-6.9, 4.3;	
   e[3] = C;	point;	dragable;	-3.1,-6.2;	
   e[4] = D;	point;	dragable;	 4.1,-2.7;	
   e[5] = sq1;	polygon;polygon; 	A,B,C,D;		0;0;black;0 
   e[6] = P;	point;	midpoint;	A,B;		
   e[7] = Q;	point;	midpoint; 	C,B;		
   e[8] = R;	point;	midpoint; 	C,D;		
   e[9] = S;	point;	midpoint; 	A,D;		
   e[10] = sq2;	polygon;polygon; 	P,Q,R,S;		0;0;blue;0
   e[11] = e;	line;	connect; 	A,C;			0;0;gray;0
   e[12] = f;	line;	connect; 	B,D;			0;0;gray;0
   e[13] = sw1;	measure;checkbox;	"Show diagonals",0;



// Show and Hide Objects
// =====================

   hidden[1] = "if (not(calculate(sw1))) hide (e,f)"