//矩形和矩形相交判断
Bool HawkRect2D::Intersect(const HawkRect2D& oRect) const
{
Float fDis = (GetBoundCenter() - oRect.GetBoundCenter()).Length();
if (fDis > GetBoundRadius() + oRect.GetBoundRadius())
{
return false;
}
for (Int32 i=0;i<4;i++)
{
HawkLine2D oLine(GetPoint(i),GetPoint((i+1)%4));
PtRelation eRel = IsClockWise()?PT_LEFT:PT_RIGHT;
if (oLine.GetPtRelation(oRect.GetPoint(0)) == eRel &&
oLine.GetPtRelation(oRect.GetPoint(1)) == eRel &&
oLine.GetPtRelation(oRect.GetPoint(2)) == eRel &&
oLine.GetPtRelation(oRect.GetPoint(3)) == eRel)
return false;
}
for (Int32 i=0;i<4;i++)
{
HawkLine2D oLine(oRect.GetPoint(i),oRect.GetPoint((i+1)%4));
PtRelation eRel = oRect.IsClockWise()?PT_LEFT:PT_RIGHT;
if (oLine.GetPtRelation(GetPoint(0)) == eRel &&
oLine.GetPtRelation(GetPoint(1)) == eRel &&
oLine.GetPtRelation(GetPoint(2)) == eRel &&
oLine.GetPtRelation(GetPoint(3)) == eRel)
return false;
}
return true;
}
/* This is unfortunately not enough to render sphere maps.
* The game has more logic to cull objects, but I don't quite know where.
* In the worst case whole sectors will be culled. */
bool
CEntity::GetIsOnScreen(void)
{
if(sphereRadius != 0.0f){
float r;
CVector c;
GetBoundCentre(&c);
r = GetBoundRadius();
return sq(r) + sq(sphereRadius) >
sq(reflectionCamPos.x - c.x) +
sq(reflectionCamPos.y - c.y) +
sq(reflectionCamPos.z - c.z);
return false;
}
return GetIsOnScreen_orig();
}