/// <summary>
/// 获取挡格附近出生点
/// </summary>
/// <param name="line"></param>
/// <param name="offset"></param>
/// <param name="bornPoint"></param>
/// <returns></returns>
public override bool GetBornPoint(LineSegment2D line, double offset, ref Double2 bornPoint)
{
Double2 dirNormal = line.normalizedDir;
Double2 diff = this.circleCenter - line.startPoint;
if (diff == Double2.zero)
{
bornPoint = line.startPoint + line.normalizedDir * (this.radius + offset);
return(true);
}
else
{
Double2 projectoint = Double2.Project(diff, dirNormal) + line.startPoint;
diff = this.circleCenter - projectoint;
double dis = this.radius * this.radius - diff.sqrMagnitude;
if (dis <= 0)
{
return(false);
}
else
{
dis = (float)System.Math.Sqrt(dis) + offset;
double value = Double2.Dot(dirNormal, line.endPoint - projectoint);
if (value > 0)
{
bornPoint = projectoint + dirNormal * dis;
}
else
{
bornPoint = projectoint - dirNormal * dis;
}
return(true);
}
}
}
/// <summary>
/// 点导几何元素的投影点
/// </summary>
/// <param name="pt"></param>
/// <returns></returns>
public Double2 ProjectPoint(Double2 pt)
{
Double2 diff = pt - this.startPoint;
if (diff == Double2.zero)
{
return(pt);
}
return(Double2.Project(diff, this.normalizedDir) + this.startPoint);
}
/// <summary>
/// 求轴向量
/// </summary>
/// <param name="pt"></param>
/// <returns></returns>
public Double2 AixsVector(Double2 pt)
{
Double2 diff = pt - this.startPoint;
if (diff == Double2.zero)
{
return(Double2.zero);
}
return(diff - Double2.Project(diff, this.normalizedDir));
}
