void
CMole::UpdateRotation(float _fTimeDelta, const CFVec2& _kvrForce)
{
if (_kvrForce.X() != 0.0f ||
_kvrForce.Y() != 0.0f)
{
// Create heading vector
CFVec2 vHeading(0.0f, -1.0f);
vHeading.RotateZ(m_fHeading);
// Cross
float fCross = 0.0f;
fCross = vHeading.X() * _kvrForce.Y();
fCross -= _kvrForce.X() * vHeading.Y();
float fRotationVelocity = m_fRotationVelocity + fDegsToRad(static_cast<float>(DIFFICULTY_ROTATION_VELOCITY_INCR * m_iDifficultyLevel));
if (fCross > 0.0f)
{
// Turn left
m_fHeading += fRotationVelocity * _fTimeDelta;
}
else
{
// Turn right
m_fHeading += fRotationVelocity * - _fTimeDelta;
}
}
}
/**
* Check this wall with an infinite ray, given in parametric form and return the collision if applicable.
* @param vRayStart Start point for parametric equation of infinite ray.
* @param vRayEnd Direction vector (coefficient of t) for paremetric equation of infinitie ray.
* @param fT To be filled in with the time (paremetric T) of intersection.
* @return True if the intersection occurs within this line segment.
*/
bool CWall::GetLineIntersectionTime( CFVec2Arg vRayStart, CFVec2Arg vRayOffset, FLOAT32& fT ) const
{
// http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/
const CFVec2& P1 = m_vEnd[0];
const CFVec2& P2 = m_vEnd[1];
const CFVec2& P3 = vRayStart;
// no P4 required..
const CFVec2 V1 = P2-P1;
const CFVec2& V2 = vRayOffset;
const FLOAT32 fDenom = V2.Y()*V1.X() - V2.X()*V1.Y();
if ( fDenom == 0.0f )
{
return false; // no intersections, or the lines are the same!
}
const FLOAT32 fDRecip = 1.0f/fDenom;
// and then, finally Q (for x/y1 - x/y3)
const CFVec2 Q = P1-P3;
const FLOAT32 fTimeThis = (V2.X()*Q.Y() - V2.Y()*Q.X())*fDRecip;
if ( fTimeThis < 0.0f || fTimeThis > 1.0f )
{
// outside of the wall line segment.
return false;
}
fT = (V1.X()*Q.Y() - V1.Y()*Q.X())*fDRecip;
return true;
}
bool CBox2D::Intersects( const CCircle& Circle ) const
{
CFVec2 vOffset = (Circle.Centre() - m_vCentre);
vOffset.SetAbs();
vOffset -= m_vExtents;
return ( vOffset.X() < Circle.Radius() && vOffset.Y() < Circle.Radius() );
}
bool CBox2D::ContainsPoint( CFVec2Arg vPoint ) const
{
CFVec2 vOffset = (vPoint - m_vCentre);
vOffset.SetAbs();
vOffset -= m_vExtents;
return ( vOffset.X() < 0.0f && vOffset.Y() < 0.0f );
}
/**
* @param fX Filled with the mouse X coordinate.
* @param fY Filled with the mouse Y coordinate.
* @param bWasClicked Filled with a bool to say if the mouse was clicked.
*/
bool CGameBoard::GetMouseInfo( FLOAT32& fX, FLOAT32& fY, bool& bWasClicked ) const
{
CFVec2 vMousePos;
CConnect4Context::GetInstance().GetMouse()->GetPosition( vMousePos );
bWasClicked = CConnect4Context::GetInstance().GetMouse()->WasClicked();
fX = vMousePos.X();
fY = vMousePos.Y();
return true;
}
bool CBox2D::Intersects( const CBox2D& Box ) const
{
CFVec2 vOffset = (Box.m_vCentre - m_vCentre);
vOffset.SetAbs();
vOffset -= m_vExtents;
vOffset -= Box.m_vExtents;
return ( vOffset.X() < 0.0f && vOffset.Y() < 0.0f );
}
void
CMole::ComputeWallForce(CFVec2& _vrRepelForce)
{
for (unsigned int i = 0; i < MAX_WHISKER; ++ i)
{
CFVec2 vLineRepelForce;
CWall* pClosestWall = 0;
float fImpactTime = 0;
bool bIntersected = FindWiskerClosestWall(static_cast<EWhisker>(i), pClosestWall, fImpactTime);
if (bIntersected)
{
// Time radio
float fTimeRatio = 1.0f - (fImpactTime / 1.0f);
fTimeRatio *= 1.8f;
if (fTimeRatio > 1.0f)
{
fTimeRatio = 1.0f;
}
CFVec2 vPointDisplacement(pClosestWall->GetStartPoint());
vPointDisplacement -= pClosestWall->GetEndPoint();
// Line direction
CFVec2 vLineDirection(vPointDisplacement);
vLineDirection.Normalise();
// Get Normal
CFVec2 vLineNormal(pClosestWall->GetNormal());
vLineNormal.Normalise();
CFVec2 vStart = pClosestWall->GetStartPoint();
CFVec2 vEnd = pClosestWall->GetEndPoint();
// Which side is the cat on
float fPerpendicularDot = (vEnd.X() - vStart.X()) * (m_vPosition.Y() - vStart.Y()) - (vEnd.Y() - vStart.Y()) * (m_vPosition.X() - vStart.X());
bool bOnNormalSide = (fPerpendicularDot > 0);
// Cat going against the normal
if (bOnNormalSide)
{
// Cat has to be on normal side
vLineRepelForce = vLineNormal;
vLineRepelForce.RotateZ(fDegsToRad(180.0f));
}
// Cat going towards normal
else
{
// Cat has to be not on normal side
vLineRepelForce = vLineNormal;
}
// Scale based on collision time
//vLineRepelForce *= 1.25f;
vLineRepelForce *= fTimeRatio;
_vrRepelForce += vLineRepelForce;
m_pWhiskers[i].SetColour(0xFFFF0000);
}
}
}
