pt A = new pt(0,0), B = new pt(0,0); // decalres an array of vertices pt X; pt C=new pt(0,0); boolean Ain=false, Bin=false; void placeAB() {A.setTo(screenCenter()); B.setTo(width/4,height/4); X=A; }; void pickAB() {if(A.disToMouse()