
/* Variables that must be defined when including this file:
   th,D1,H,R1,R2,Lc */

XC1 = (D1 - R1) * Cos(th) ;             // Sup. circle center
YC1 = (D1 - R1) * Sin(th) ;
XC2 = (D1 - H + R2) * Cos(th) ;		// Inf. circle center
YC2 = (D1 - H + R2) * Sin(th) ;

XS1 = (D1) * Cos(th) ;		        // Sup. circle top
YS1 = (D1) * Sin(th) ;

dth = Pi - ArcCos((R1 - R2) / (H - R1 - R2)) ;

XA1 = XC1 + R1 * Cos(th - dth) ;	// Sup. right tangency point
YA1 = YC1 + R1 * Sin(th - dth) ;
XA2 = XC2 + R2 * Cos(th - dth) ;	// Inf. right tangency point
YA2 = YC2 + R2 * Sin(th - dth) ;
XB1 = XC1 + R1 * Cos(th + dth) ; 	// Sup. left tangency point
YB1 = YC1 + R1 * Sin(th + dth) ;
XB2 = XC2 + R2 * Cos(th + dth) ;	// Inf. left tangency point
YB2 = YC2 + R2 * Sin(th + dth) ;

// Pole

/* 'newp' is a meta variable defining a new point number for
   you.  This is mostly useful with included files. There is also
   'newreg' which defines a new region number (that is, everything
   that is not a point). */

p1 = newp ; Point(p1) = { XA2 , YA2, 0., 3*Lc} ;
p2 = newp ; Point(p2) = { XA1 , YA1, 0., Lc} ;
p3 = newp ; Point(p3) = { XC1 , YC1, 0., Lc} ;
p4 = newp ; Point(p4) = { XB1 , YB1, 0., Lc} ;
p5 = newp ; Point(p5) = { XB2 , YB2, 0., 3*Lc} ;
p6 = newp ; Point(p6) = { XC2 , YC2, 0., 3*Lc} ;

p7 = newp ; Point(p7) = { XS1 , YS1, 0., Lc} ;

lin1 = newreg ; Line(lin1)    = {p1,p2} ;
arc1 = newreg ; Circle (arc1) = {p2,p3,p7} ;
arc2 = newreg ; Circle (arc2) = {p7,p3,p4} ;
lin2 = newreg ; Line(lin2)    = {p4,p5} ;
arc3 = newreg ; Circle(arc3)  = {p5,p6,p1} ;

reg1 = newreg ; Line Loop(reg1) = {lin1,arc1,arc2,lin2,arc3};
reg2 = newreg ; Plane Surface(reg2) = {reg1};

