//直线和矩形相交的交点
Bool HawkRay2D::Intersect(const HawkRect2D& oRect,Vec2IntrResult* pResult) const
{
//包围圆与对应直线的关系
HawkVector2D vCenter = oRect.GetBoundCenter();
Float fRadius = oRect.GetBoundRadius();
if (GetDistance(vCenter) > fRadius)
{
return false;
}
PtRelation eRel[4] = {PT_NONE};
for (Int32 i=0; i<4; i++)
{
HawkVector2D oVec2 = oRect.GetPoint(i);
eRel[i] = GetPtRelation(oVec2);
if (eRel[i] == PT_ON)
{
if (pResult)
{
if(!HawkMath::IsZero(Direction.X))
{
pResult->Factor = (oVec2.X-Point.X) / Direction.X;
}
else if(!HawkMath::IsZero(Direction.Y))
{
pResult->Factor = (oVec2.Y-Point.Y) / Direction.Y;
}
else
{
T_Exception("Direction Is Zero.");
}
pResult->Point = oVec2;
}
return true;
}
}
for (Int32 i=0; i<4; i++)
{
if (eRel[i] != eRel[(i+1)%4])
{
HawkSegment2D oSeg(oRect.GetPoint(i),oRect.GetPoint((i+1)%4));
if(Intersect(oSeg,pResult))
return true;
}
}
return false;
}
//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;
}
void HawkTransform::Scale(HawkRect2D& oRect,const HawkVector2D& oRefPt,Float fScale)
{
if(oRect.IsPointInside(oRefPt) && fScale>=0.0f)
{
HawkVector2D oTmp = oRefPt - oRect.Point;
oRect.Point = oRefPt + fScale*oTmp;
oRect.Edge[0] *= fScale;
oRect.Edge[1] *= fScale;
}
}