/// <summary>
/// point是否在扇形范围内
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
public bool ContainPoint(Vector3 point)
{
point.y = 0;
Vector3 line = point - m_center;
float dis = Vector3.SqrMagnitude(line) - m_radius * m_radius;
//如果角度为0, 我们就只判断距离
if (m_angle <= 0)
{
return(dis <= m_radius * m_radius);
}
//距离太远在圆形外
if (dis > 0)
{
return(false);
}
float startAngle = m_centerAngle - m_angle * 0.5f;
float endAngle = m_centerAngle + m_angle * 0.5f;
float targetAngle = CMathUtil.GetVec3AngleInXZ(line);
return(targetAngle > startAngle && targetAngle < endAngle);
}
/// <summary>
///
/// </summary>
/// <param name="pt"></param>
/// <returns></returns>
public bool pointInRect(Vector3 pt)
{
//Arectangle = 0.5⋅(yA − yC)⋅(xD−xB)+(yB−yD)⋅(xA−xC)
//四边形面积公式
if (m_area < 0)
{
m_area = 0.5f * Mathf.Abs(
(m_a.y - m_c.y) * (m_d.x - m_b.x) +
(m_b.y - m_d.y) * (m_a.x - m_c.x));
}
//Atriangle=0.5⋅(x1⋅(y2−y3)+x2⋅(y3−y1)+x3⋅(y1−y2))
//三角形面积
float abp = GetTriangleArea(m_a, m_b, pt);
float bcp = GetTriangleArea(m_b, m_c, pt);
float cdp = GetTriangleArea(m_c, m_d, pt);
float dap = GetTriangleArea(m_d, m_a, pt);
float area = abp + bcp + cdp + dap;
return(CMathUtil.FloatEqual(area, m_area, 0.1f));
}
/// <summary>
/// 设置扇形中心线
/// </summary>
/// <param name="direction"></param>
public void SetDirection(Vector3 direction)
{
m_direction = direction;
m_direction.y = 0;
m_centerAngle = CMathUtil.GetVec3AngleInXZ(m_direction);
}