Strabo.Core.TextDetection.TextString.CosAngel C# (CSharp) Метод

        private double CosAngel(int idx1, int idx2, int i)
        {
            double error = 0.00001;

            Point p3 = new Point(_char_list[i].bbx.X + (_char_list[i].bbx.Width) / 2, _char_list[i].bbx.Y + (_char_list[i].bbx.Height) / 2);
            Point p1 = new Point(_char_list[idx1].bbx.X + (_char_list[idx1].bbx.Width) / 2, _char_list[idx1].bbx.Y + (_char_list[idx1].bbx.Height) / 2);
            Point p2 = new Point(_char_list[idx2].bbx.X + (_char_list[idx2].bbx.Width) / 2, _char_list[idx2].bbx.Y + (_char_list[idx2].bbx.Height) / 2);
            if (_debug) Console.WriteLine(p1.X + " " + p1.Y + ";" + p2.X + " " + p2.Y + ";" + p3.X + " " + p3.Y + ";");
            double x1 = p1.X;
            double x2 = p2.X;
            double x3 = p3.X;
            double y1 = p1.Y;
            double y2 = p2.Y;
            double y3 = p3.Y;
            if (x1 == x3 && x2 == x3)
                return 180;
            if (y1 == y3 && y2 == y3)
                return 180;
            double adotb = (x2 - x3) * (x1 - x3) + (y2 - y3) * (y1 - y3);
            double tmp1 = (Math.Sqrt((x2 - x3) * (x2 - x3) + (y2 - y3) * (y2 - y3)) * Math.Sqrt((x1 - x3) * (x1 - x3) + (y1 - y3) * (y1 - y3)));
            double tmp2 = adotb / tmp1;
            double angel = 0;
            if (Math.Abs(Math.Abs(tmp2) - 1) < error) angel = 180;
            else
            {
                angel = Math.Acos(adotb / tmp1);
                angel = angel * 180 / Math.PI;
            }
            if (angel < 0)
                return 180 + angel;

            else return angel;
        }