Image and tgraph

ROOT
1

Hi

I have to add a point in a graph like the one in attachment.
The graph is available only as image (.png .gif or .ps).
I would like to convert it in a true root tgraph.
Is there some way to do this?

Thanks in advance.
Giovanni

antipp_old.png1280×800 91.8 KB

2

Do you need something like this:
star.bnl.gov/public/comp/vis … ed_all.png
star.bnl.gov/public/comp/vis … butionPage

3

We are currently working on a standard ROOT utility to reconstruct automatically objects like TGraph, TGraphErrors, TH1, TH2 from a raster image (.gif, .jpg, etc)

Rene

4

xyscan is what I was looking for
thanks!
Giovanni

5

The simple correction of the xyscan source code can significantly simplify its use. It allows to use the double click to quickly move the cross-hair pointer to desirable screen location. The correction will be used with the next xyscan release. However, you are advised to apply it right now.

[code]— xyscanWindow.cpp 2007-07-18 12:33:14.000000000 -0400
+++ xyscanWindow.cpp.hold 2008-10-27 18:58:57.000000000 -0400
@@ -694,7 +694,9 @@
leftMousePressedNearCrosshair = false;
return true;
}

  •    else if (event->type() == QEvent::GraphicsSceneMouseMove &&  leftMousePressedNearCrosshair) {

  •    else if ( (event->type() == QEvent::GraphicsSceneMouseMove 

  •                && leftMousePressedNearCrosshair )

  •              || event->type() == QEvent::GraphicsSceneMouseDoubleClick

  •       ) {
        mevt = dynamic_cast<QGraphicsSceneMouseEvent*>(event);
       //
       //  In principle straighforward except for the case[/code]