void init(int _w, int _h){
int xs =_w/2;
int ys = _h/2;
int sl = 10;
int sh = 10;
int y = 0;
glLineWidth(3);
//J
glBegin(GL_LINE_STRIP);
glVertex2i(xs,ys );
glVertex2i((xs+(0*sh)),(ys - (10*sl)));
glVertex2i((xs-(1*sh)),(ys - (11*sl)));
glVertex2i((xs-(2*sh)),(ys - (12*sl)));
glVertex2i((xs-(3*sh)),(ys - (13*sl)));
glVertex2i((xs-(4*sh)),(ys - (14*sl)));
glVertex2i((xs-(5*sh)),(ys - (13*sl)));
glVertex2i((xs-(6*sh)),(ys - (12*sl)));
glVertex2i((xs-(7*sh)),(ys - (11*sl)));

glEnd();

//D
glBegin(GL_LINE_STRIP);

glVertex2i((xs +(2*sh)),ys );
glVertex2i((xs+(2*sh)),(ys - (14*sl)));
glVertex2i((xs+(5*sh)),(ys - (14*sl)));
glVertex2i((xs+(6*sh)),(ys - (12*sl)));
glVertex2i((xs+(7*sh)),(ys - (11*sl)));
glVertex2i((xs+(7*sh)),(ys - (11*sl)));
glVertex2i((xs+(6*sh)),(ys - (2*sl)));
glVertex2i((xs+(5*sh)),(ys - (0*sl)));
glVertex2i((xs+(2*sh)),(ys - (0*sl)));

glEnd();

}