public bool Intersects(Line other)
{
Vector2f lineSegmentStart = new Vector2f(other.GetX1(), other.GetY1());
Vector2f lineSegmentEnd = new Vector2f(other.GetX2(), other.GetY2());
Vector2f circleCenter = new Vector2f(GetCenterX(), GetCenterY());
Vector2f closest;
Vector2f segv = lineSegmentEnd.Cpy().Sub(lineSegmentStart);
Vector2f ptv = circleCenter.Cpy().Sub(lineSegmentStart);
float segvLength = segv.Len();
float projvl = ptv.Dot(segv) / segvLength;
if (projvl < 0)
{
closest = lineSegmentStart;
}
else if (projvl > segvLength)
{
closest = lineSegmentEnd;
}
else
{
Vector2f projv = segv.Cpy().Scale(projvl / segvLength);
closest = lineSegmentStart.Cpy().Add(projv);
}
bool intersects = circleCenter.Cpy().Sub(closest).LengthSquared() <= GetRadius()
* GetRadius();
return(intersects);
}
/// <summary>
/// ��鵱ǰԲ���Ƿ����ָ��ֱ��
/// </summary>
///
/// <param name="line"></param>
/// <returns></returns>
public bool Contains(Line line)
{
return Contains(line.GetX1(), line.GetY1())
&& Contains(line.GetX2(), line.GetY2());
}
public bool Intersects(Line other)
{
Vector2f lineSegmentStart = new Vector2f(other.GetX1(), other.GetY1());
Vector2f lineSegmentEnd = new Vector2f(other.GetX2(), other.GetY2());
Vector2f circleCenter = new Vector2f(GetCenterX(), GetCenterY());
Vector2f closest;
Vector2f segv = lineSegmentEnd.Cpy().Sub(lineSegmentStart);
Vector2f ptv = circleCenter.Cpy().Sub(lineSegmentStart);
float segvLength = segv.Len();
float projvl = ptv.Dot(segv) / segvLength;
if (projvl < 0)
{
closest = lineSegmentStart;
}
else if (projvl > segvLength)
{
closest = lineSegmentEnd;
}
else
{
Vector2f projv = segv.Cpy().Scale(projvl / segvLength);
closest = lineSegmentStart.Cpy().Add(projv);
}
bool intersects = circleCenter.Cpy().Sub(closest).LengthSquared() <= GetRadius()
* GetRadius();
return intersects;
}
/// <summary>
/// 检查当前圆形是否包含指定直线
/// </summary>
///
/// <param name="line"></param>
/// <returns></returns>
public bool Contains(Line line)
{
return(Contains(line.GetX1(), line.GetY1()) &&
Contains(line.GetX2(), line.GetY2()));
}