//计算线段是否相交
private bool IsRectCross(Obstructer.line p1, Obstructer.line p2)
{
bool IsCross = !(Mathf.Max(p1.start.x, p1.end.x) < Mathf.Min(p2.start.x, p2.end.x) ||
Mathf.Max(p1.start.y, p1.end.y) < Mathf.Min(p2.start.y, p2.end.y) ||
Mathf.Max(p2.start.x, p2.end.x) < Mathf.Min(p1.start.x, p1.end.x) ||
Mathf.Max(p2.start.y, p2.end.y) < Mathf.Min(p1.start.y, p1.end.y));
if (IsCross)
{
if ((((p1.start.x - p2.start.x) * (p2.end.y - p2.start.y) -
(p1.start.y - p2.start.y) * (p2.end.x - p2.start.x)) *
((p1.end.x - p2.start.x) * (p2.end.y - p2.start.y) -
(p1.end.y - p2.start.y) * (p2.end.x - p2.start.x))) > 0 ||
(((p2.start.x - p1.start.x) * (p1.end.y - p1.start.y) -
(p2.start.y - p1.start.y) * (p1.end.x - p1.start.x)) *
((p2.end.x - p1.start.x) * (p1.end.y - p1.start.y) -
(p2.end.y - p1.start.y) * (p1.end.x - p1.start.x))) > 0)
{
IsCross = false;
}
}
#if DRAWDEBUG
Debug.DrawLine(p1.start, p1.end, IsCross ? Color.red : Color.green);
Debug.DrawLine(p2.start, p2.end, Color.yellow);
if (IsCross)
{
// Debug.Break();
}
#endif
return(IsCross);
}
private bool CheckBoxLine(Obstructer.Rect boxRect, Vector2 dir, out Vector2 newDir)
{
newDir = Vector2.zero;
if (!boxRect.Overlaps(m_PlayerRect, out m_OveRect))
{
return(false);
}
//场景碰撞盒的四条边
m_SideLines = m_OveRect.boxLines;
#if DRAWDEBUG
m_OveRect.DrawBox(Color.blue);
#endif
float maxValue = m_OveRect.width > m_OveRect.height ? m_OveRect.width : m_OveRect.height;
//检测线段
m_DirLine = new Obstructer.line(m_OveRect.center, m_OveRect.center - dir * (maxValue * 2));
for (int index = 0; index < m_SideLines.Length; index++)
{
if (IsRectCross(m_SideLines[index], m_DirLine))
{
//得到相交矩形的非相交轴的长度
if (index < 2)
{
newDir.y = (dir.y > 0 ? -1 : 1) * (m_OveRect.height + 0.01f);
}
else
{
newDir.x = (dir.x > 0 ? -1 : 1) * (m_OveRect.width + 0.01f);
}
return(true);
}
}
return(false);
}
