bool Graph::SetYScale()
{
int nc;
CCurve *pCurve;
if(m_bAutoY)
{
bool bCurve = false;
if (m_oaCurves.size())
{
//init only if we have a curve
for (nc=0; nc < m_oaCurves.size(); nc++)
{
pCurve = (CCurve*)m_oaCurves[nc];
if ((pCurve->IsVisible() ||pCurve->PointsVisible()) && pCurve->n>0)
{
bCurve = true;
break;
}
}
}
if(bCurve)
{
Cymin = 9999999.0;
Cymax = -9999999.0;
for (nc=0; nc < m_oaCurves.size(); nc++)
{
pCurve = (CCurve*)m_oaCurves[nc];
if ((pCurve->IsVisible() ||pCurve->PointsVisible()) && pCurve->n>0)
{
Cymin = qMin(Cymin, pCurve->GetyMin());
Cymax = qMax(Cymax, pCurve->GetyMax());
}
}
if(Cymax<=Cymin)
{
Cymax = (Cymin+1.0)*2.0;
}
if(m_Type == 1)
{
ymin = qMin(ymin, Cymin);
ymax = qMax(ymax, Cymax);
}
else
{
ymin = Cymin;
ymax = Cymax;
}
if(Cymin>=0.0) ymin = 0.0;
if(Cymax<=0.0) ymax = 0.0;
}
else
{
// until things are made clear
for (int nc=0; nc < m_oaCurves.size(); nc++)
{
pCurve = (CCurve*)m_oaCurves[nc];
if ((pCurve->IsVisible() ||pCurve->PointsVisible()) && pCurve->n>0)
{
ymin = qMin(ymin, pCurve->y[0]);
ymax = qMax(ymax, pCurve->y[0]);
}
}
}
yo=0.0;
if (fabs((ymin-ymax)/ymin)<0.001)
{
if(fabs(ymin)<0.00001) ymax = 1.0;
else
{
ymax = 2.0 * ymin;
if(ymax < ymin)
{
double tmp = ymax;
ymax = ymin;
ymin = tmp;
}
}
}
if(m_h<=0.0) return false;
if (!m_bYInverted)
{
m_scaley = -(ymax-ymin)/m_h;
}
else
{
m_scaley = (ymax-ymin)/m_h;
}
//try to set an automatic scale for Y Axis
SetAutoYUnit();
}
else
{
//scales are set manually
if(m_h<=0) return false;
if (!m_bYInverted)
{
m_scaley = -(ymax-ymin)/m_h;
}
else
{
m_scaley = (ymax-ymin)/m_h;
}
if (yunit<1.0)
{
exp_y = (int)log10(yunit*1.00001)-1;
exp_y = qMax(-4, exp_y);
}
else exp_y = (int)log10(yunit*1.00001);
}
//graph center position
int Yg = (m_rCltRect.top() + m_rCltRect.bottom())/2;
// curves center position
int Yc = (int)((ymin+ymax)/2.0/m_scaley);
// center graph in drawing rectangle
m_ptoffset.ry() = (Yg-Yc);
return true;
}
