[C#/COMMON] Math 클래스 : 각도 구하기

using System;

#region 각도 구하기 - GetAngle(startX, startY, endX, endY)

/// <summary>
/// 각도 구하기
/// </summary>
/// <param name="startX">시작 X</param>
/// <param name="startY">시작 Y</param>
/// <param name="endX">종료 X</param>
/// <param name="endY">종료 Y</param>
/// <returns>각도</returns>
public double GetAngle(double startX, double startY, double endX, double endY)
{
    double deltaX = endX - startX;
    double deltaY = endY - startY;

    return Math.Atan2(deltaY, deltaX) * (180d / Math.PI);
}

#endregion