[ZoNT]

if(array1[j].x1 != array0[i].x1) {
                            var a, b, sinus, cosinus, tangens, alpha;
                            a = array1[j].y1 - array0[i].y2;
                            b = array1[j].x1 - array0[i].x2;
                            alpha = Math.atan(a/b);
                            //alert(alpha);
                            ctx.rotate(alpha);
                        }