public static cyOXYLine operator *(cyOXYLine line, double a)
{
cyOXYLine obj = new cyOXYLine();
obj.A = (float)(line.A * a);
obj.B = (float)(line.B * a);
obj.C = (float)(line.C * a);
return(obj);
}
/// <summary>
/// 计算两个直线的夹角是多少
/// </summary>
/// <param name="line1"></param>
/// <returns></returns>
public double GetAngle(cyOXYLine line1)
{
double xArr = line1.A - A;
double yArr = line1.B - B;
double angle = Math.Atan2(yArr, xArr);
return(angle);
}
/// <summary>
/// 根据旋转矩阵，对直线进行旋转,
/// 旋转中心点：(0,0)点
/// 旋转矩阵为：Tr = [cosθ, -sinθ, Xoffset];
/// [sinθ, cosθ, Yoffset];
/// [ 0, 0, 1];
/// θ为：O-XY，中的夹角
/// 直线系数[A,B,C], 原始的直线系数为：[a,b,c]
/// [A,B,-C] = [a,b,-c]*Tr;(因为还是在原始的坐标系中， x', y'都是过渡量，还是得转换成x,y的方程)
/// </summary>
/// <param name="transArray">旋转矩阵，</param>
/// <param name="pointX">旋转点坐标X</param>
/// <param name="pointY">旋转点坐标Y</param>
public cyOXYLine OnTranslateCoorPoint(double angle, double pointX, double pointY)
{
double cosV = Math.Cos(angle), sinV = Math.Sin(angle);
double A1 = A * cosV - B * sinV;
double B1 = A * sinV + B * cosV;
double C1 = C - ((A * pointX) + B * (pointY));
//计算某个特定的值
cyOXYLine newline = new cyOXYLine(A1, B1, C1);
newline.OnMove(-pointX, -pointY);
return(newline);
}
/// <summary>
/// 判断是否与a 垂直
/// </summary>
/// <param name="a"></param>
/// <returns></returns>
public bool OnVertical(cyOXYLine a)
{
float tValue = a.A * this.A + this.B * this.B;
return(Math.Abs(tValue) <= 1e-6 ? true : false);
}
/// <summary>
/// 判断两条直线是否平行
/// </summary>
/// <param name="a"></param>
/// <returns></returns>
public bool GetParallel(cyOXYLine a)
{
double tValue = A * a.B - B * a.A;
return(Math.Abs(tValue) <= 1e-16);
}