//------------------------------------------------------------------------------
bool TurnShipAboutCondition::Evaluate (void)
{
Vector forward = m_ship->GetOrientation ().GetForward ();
float cosTheta = forward * m_startingForward;
float minAngleDegrees = 10.0f;
float minCosAngle = cosf (RadiansFromDegrees(minAngleDegrees));
// the ship has "turned about" if the angle of movement is greate than the min angle
return (cosTheta < minCosAngle) ? true : false;
}
SolidObject& TriangleMesh::RotateZ(double angleInDegrees)
{
const double angleInRadians = RadiansFromDegrees(angleInDegrees);
const double a = cos(angleInRadians);
const double b = sin(angleInRadians);
const Vector center = Center();
PointList::iterator iter = pointList.begin();
PointList::iterator end = pointList.end();
for (; iter != end; ++iter)
{
Vector& point = *iter;
const double dx = point.x - center.x;
const double dy = point.y - center.y;
point.x = center.x + (a*dx - b*dy);
point.y = center.y + (a*dy + b*dx);
}
return *this;
}