Dear Root Users my problem is the following:
I have N points that I want to plot (let's say I know their X and Y).
I have also an integer index "index" that is associated to each point I
plot,
and which increases of one unit its value after the point has been plot.
Let's say:
index = 0;
for (int j=0;J<N;j++)
{
Plot(Point);
index++;
}
My whish woulkd be plotting the value of i by the point in the scatter
plot, as in the following naive picture:
Y
^ 2
| * 3
| *
| 1
| *
-------->X
One usually uses the TLatex class for drawning text onto graphics.
The problem is that the object
tex = new TLatex(X,Y,c)
wants c to be of type char*
So I use the following procedure:
I included the two libs:
#include <sstream>
#include <string>
then
std::ostringstream buffer;
buffer << index;
string s = buffer.str();
char *c = new char[s.length()+1];
strcpy(c, s.c_str());
tex = new TLatex(tr.x(),tr.y(),c);
tex->SetTextSize(0.02);
tex->SetTextColor(1);
tex->SetLineWidth(.5);
tex->Draw();
index++;
I finally got printed the numbers, but together with special characters
(trash!!!) as for example:
Y
^ 2 @h'@
| * 3 @yyyyyy@@@
| *
| 1 @@yPPPy@@@@
| *
-------->X
Well I don't know how to get rid of such dirty characters, which
originate, I presume, from the passage when buffering or when
string-copying.
Thank you very much for your attention, and for a halp.
Tommaso
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