void PLANE::SetFromPoints(const VECTOR3D & p0, const VECTOR3D & p1, const VECTOR3D & p2)
{
normal=(p1-p0).CrossProduct(p2-p0);
normal.Normalize();
CalculateIntercept(p0);
}
void cPlane::SetFromPoints(const cVec3 & p0, const cVec3 & p1, const cVec3 & p2)
{
normal = (p1 - p0).CrossProduct(p2 - p0);
normal.Normalise();
CalculateIntercept(p0);
}
void Trendline::UpdateTrendline(Point2DInt_t* pointsArray)
{
m_points[m_count].x = (*pointsArray).y;
m_points[m_count].y = (*pointsArray).x;
m_count++;
yAxisValuesSum += m_points[m_count-1].y;
xAxisValuesSum += m_points[m_count-1].x;
xySum += m_points[m_count-1].x*m_points[m_count-1].y;
xxSum += m_points[m_count-1].x*m_points[m_count-1].x;
CalculateSlope();
CalculateIntercept();
}
void Trendline::Initialize()
{
yAxisValuesSum = 0;
xAxisValuesSum = 0;
xxSum = 0;
xySum = 0;
for (int i = 0; i < m_count; i++)
{
yAxisValuesSum += m_points[i].y;
xAxisValuesSum += m_points[i].x;
xySum += m_points[i].x*m_points[i].y;
xxSum += m_points[i].x*m_points[i].x;
}
CalculateSlope();
CalculateIntercept();
}
void Trendline::EraseLastPointsPrecentage(float pointsPrecentage)
{
//cout << "m_count = " << m_count << " m_slope = " << m_slope << " m_intercept = " << m_intercept;
int placeArrayToRemove = (float)m_count*(1-pointsPrecentage);
for(int i = placeArrayToRemove; i < m_count ; i++)
{
yAxisValuesSum -= m_points[i].y;
xAxisValuesSum -= m_points[i].x;
xySum -= m_points[i].x*m_points[i].y;
xxSum -= m_points[i].x*m_points[i].x;
}
m_count = placeArrayToRemove;
CalculateSlope();
CalculateIntercept();
// cout << "New m_count = " << m_count << " m_slope = " << m_slope << " m_intercept = " << m_intercept << "\n";
}
