/// <summary>
/// 数乘
/// </summary>
/// <param name="p"></param>
/// <param name="f"></param>
/// <returns></returns>
public static _2D_Point operator *(_2D_Point p, double f)
{
_2D_Point t = new _2D_Point();
t.X = p.X * f;
t.Y = p.Y * f;
return t;
}
/// <summary>
/// 坐标变换
/// </summary>
/// <param name="p">需要变换的点</param>
/// <returns>变换后的点</returns>
public _2D_Point Change(_2D_Point p)
{
double x=dx+(1+m)*(p.X*cos(xita)+p.Y*sin(xita)),
y=dy+(1+m)*(-p.X*sin(xita)+p.Y*cos(xita));
return new _2D_Point(x, y);
}
/// <summary>
/// 返回绝对值
/// </summary>
/// <returns></returns>
public _2D_Point Abs()
{
_2D_Point t = new _2D_Point();
t.X = Math.Abs(this.X);
t.Y = Math.Abs(this.Y);
return t;
}
/// <summary>
/// 转换成整数，四舍五入
/// </summary>
/// <returns></returns>
public _2D_Point ChangeToInt()
{
_2D_Point t = new _2D_Point();
t.X = (int)(this.X + 0.5);
t.Y = (int)(this.Y + 0.5);
return t;
}
/// <summary>
/// 输出点数组
/// </summary>
/// <param name="filename"></param>
/// <param name="p"></param>
public static void Output(string filename, _2D_Point[] p)
{
StreamWriter writer = new StreamWriter(filename);
for (int i = 0; i < p.Length; i++)
writer.WriteLine(p[i].ToString());
writer.Close();
}
/// <summary>
/// 计算一条边的方位角
/// </summary>
/// <param name="pre"></param>
/// <param name="pos"></param>
/// <returns></returns>
public static Angle Get_PAngle(_2D_Point pre, _2D_Point pos)
{
_2D_Point preDxy;
preDxy = pos - pre;
//posDxy = pos - cur;
double a;
Angle pAngle;
a = Math.Atan(preDxy.Y / preDxy.X);
//b = Math.Atan(posDxy.Y / posDxy.X);
if (a >= 0)
{
if (preDxy.X > 0)
{
pAngle = Angle.ChangeToAngle(a);
}
else
{
pAngle = Angle.ChangeToAngle(a + Math.PI);
}
}
else
if (preDxy.X >= 0)
{
pAngle =Angle.ChangeToAngle(a + Math.PI * 2);
}
else
{
pAngle = Angle.ChangeToAngle(a + Math.PI);
}
return pAngle;
}
/// <summary>
/// 两点间距离或向量模
/// </summary>
/// <param name="p1"></param>
/// <param name="p2"></param>
/// <returns></returns>
public static double Get_Norm(_2D_Point p1, _2D_Point p2)
{
return Math.Sqrt((p1 - p2).X * (p1 - p2).X + (p1 - p2).Y * (p1 - p2).Y);
}
/// <summary>
/// 均取相反数
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
public static _2D_Point operator -(_2D_Point p)
{
_2D_Point t = new _2D_Point();
t.X = -p.X;
t.Y = -p.Y;
return t;
}
/// <summary>
/// 对应相减
/// </summary>
/// <param name="p1"></param>
/// <param name="p2"></param>
/// <returns></returns>
public static _2D_Point operator -(_2D_Point p1, _2D_Point p2)
{
_2D_Point t = new _2D_Point();
t.X = p1.X - p2.X;
t.Y = p1.Y - p2.Y;
return t;
}
