Hello,
I have a class derived from TH1F that overrides DistancetoPrimitive(). (I
want
a TH1F that gets selected when ever the mouse is between the histogram line
and
the y=0 axis.) I use gPad->PixeltoX/Y() routines. The gPad->PixelToX works
fine:
x is what it should be. The y is totally goofy. For example, when the
displayed y-range is between 0 and 16000, gPad->PixeltoY returns -20657 when
it
should be 0 and -6242 when it should be 16000. (numbers here are
approximate)
What is going wrong? When I display the Status Bar, the displayed y-value
is
correct.
I am using root 3.03/9a on win2k. I use cint and vc++ 6.0 to make my class
into
a dll.
Thanks..
//--------------------------------------------------------------------------
---
Int_t CRange::DistancetoPrimitive(Int_t px,Int_t py)
{
Int_t dist = 999999;
double x = gPad->PixeltoX(px);
double y = gPad->PixeltoY(py);
// debug print
printf("x = %f y = %f pixx = %d pixy = %d\n",x,y,px,py);
int bin = FindBin(x);
if (bin<1 || bin>GetNbinsX()) return dist;
double yHist = GetBinContent(bin);
if (yHist>0.)
{
if (y<yHist && y>0.) dist = 2;
}
else
{
if (y>yHist && y<0.) dist = 2;
}
return dist;
}
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