bool Graph::SetXScale()
{
CCurve *pCurve;
int nc;
if(m_bAutoX)
{
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>1)
{
bCurve = true;
break;//there is something to draw
}
}
}
if (bCurve)
{
Cxmin = 9999999.0;
Cxmax = -9999999.0;
for (nc=0; nc < m_oaCurves.size(); nc++)
{
pCurve = (CCurve*)m_oaCurves[nc];
if ((pCurve->IsVisible() ||pCurve->PointsVisible()) && pCurve->n>0)
{
Cxmin = qMin(Cxmin, pCurve->GetxMin());
Cxmax = qMax(Cxmax, pCurve->GetxMax());
}
}
if(Cxmax<=Cxmin)
Cxmax = (Cxmin+1.0)*2.0;
if(m_Type == 1)
{
xmin = qMin(xmin, Cxmin);
xmax = qMax(xmax, Cxmax);
}
else
{
xmin = Cxmin;
xmax = Cxmax;
}
if(Cxmin>=0.0) xmin = 0.0;
if(Cxmax<=0.0) xmax = 0.0;
}
else
{
// until things are made clear
for (nc=0; nc < m_oaCurves.size(); nc++)
{
pCurve = (CCurve*)m_oaCurves[nc];
if ((pCurve->IsVisible() ||pCurve->PointsVisible()) && pCurve->n>0)
{
xmin = qMin(xmin, pCurve->x[0]);
xmax = qMax(xmax, pCurve->x[0]);
}
}
}
xo=0.0;
if(fabs((xmin-xmax)/xmin)<0.001)
{
if(fabs(xmin)<0.00001) xmax = 1.0;
else
{
xmax = 2.0 * xmin;
if(xmax < xmin)
{
double tmp = xmax;
xmax = xmin;
xmin = tmp;
}
}
}
if(m_w<=0.0) return false;
m_scalex = (xmax-xmin)/m_w;
//try to set an automatic scale for X Axis
SetAutoXUnit();
}
else
{
//scales are set manually
if(m_w<=0.0) return false;
// m_scalex = (xmax-xmin)/m_w;
if (xunit<1.0)
{
exp_x = (int)log10(xunit*1.00001)-1;
exp_x = qMax(-4, exp_x);
}
else exp_x = (int)log10(xunit*1.00001);
}
m_scalex = (xmax-xmin)/m_w;
//graph center position
int Xg = (m_rCltRect.right() + m_rCltRect.left())/2;
// curves center position
int Xc = (int)((xmin+xmax)/2.0/m_scalex);
// center graph in drawing rectangle
m_ptoffset.rx() = (Xg-Xc);
return true;
}
