We know two longitude and latitude points and find the angle of the two points.

At present, there is a demand in the project, which needs to go from two points to the line. This is mainly used in map and GIS.

Searching for tokens on the Internet is not correct.

 

 

Result 2

 

The Code is as follows:

 public double GetAngle(MapPoint pntFirst, MapPoint pntNext)        {            double dRotateAngle = Math.Atan2(Math.Abs(pntFirst.X - pntNext.X), Math.Abs(pntFirst.Y - pntNext.Y));            if (pntNext.X >= pntFirst.X)            {                if (pntNext.Y >= pntFirst.Y)                {                                    }                else                {                    dRotateAngle = Math.PI - dRotateAngle;                }            }            else            {                if (pntNext.Y >= pntFirst.Y)                {                    dRotateAngle = 2 * Math.PI - dRotateAngle;                }                else                {                    dRotateAngle = Math.PI + dRotateAngle;                }            }            dRotateAngle = dRotateAngle * 180 / Math.PI;            return dRotateAngle;        }