Hi Rene,
The message you replied to was sent prior to my receiving your email
notifying me of your fixes to TGraph. There seems to be a large delay in all
email I send from work... who knows what kind of trouble our IT department
has gotten our mail servers in.
Anyway, once I got your email, I updated ROOT from CVS, and the extra boxes
no longer appear! Occassionally, though, I still get the boxes apparently
wrapping around the edge of the graph (so that they are canvas-wide
rectangles rather than nice little squares). I haven't been able to come up
with a simple repeatable example of that, yet, though. If I do, I will pass
it along.
Thanks for the VERY quick resolution of my bug report!
Tony
-----Original Message-----
From: Rene Brun [mailto:Rene.Brun@cern.ch]
Sent: Wednesday, February 27, 2002 07:01
To: Colley, Tony
Cc: 'ROOT Talk'
Subject: Re: [ROOT] RE: zoomed in TGraph bug
Hi Tony,
Did you start from the CVS source with the tag 3-03-02 or from
the CVS head? I implemented this change only last night !
This morning, I have added additional protections in TGraph::ExecuteEvent
in case you zoom with very large factors.
Rene Brun
Colley, Tony wrote:
>
> By the way, I just did a CVS update, remade & reinstalled ROOT, and now am
> running ROOT 3.03/02...
>
> and the problem described below still exists.
>
> -----Original Message-----
> From: Colley, Tony
> Sent: Tuesday, February 26, 2002 15:37
> To: 'ROOT Talk'
> Subject: zoomed in TGraph bug
>
> The following demonstrates a "minor" bug in TGraph:
>
> {
> Int_t i;
> Float_t x[1000];
> Float_t y[1000];
>
> for (i=0; i<1000; i++)
> {
> x[i] = 0.001*i;
> y[i] = 6.2831853*x[i];
> y[i] = sin(12*y[i]) + sin(17*y[i]) + sin(56*y[i]) + sin(74*y[i]);
> }
>
> TGraph *graph = new TGraph( 1000, x, y );
> graph->Draw("AL");
>
> printf(
> "\n\n===============================================================\n" );
> printf( "Right click on X axis and select SetRangeUser.\n" );
> printf( "Enter the range 0.387 to 0.389 and click OK.\n" );
> printf( "Move the cursor over one of the 3 points (at .387, .388,
.389).\n"
> );
> printf( "Press down the left mouse button.\n" );
> printf( "When I do it, there are 6 extra boxes drawn\n" );
> printf( " (in addition to the three that should be drawn)\n" );
> printf(
"===============================================================\n"
> );
> }
>
> (I've attached the same thing as tgdemo.C, in case that's easier to use
than
> just cutting/pasting from this email)
>
> The y function was chosen arbitrarily. The bug appears for many other
> functions I tried.
>
> The bug is even more insidious when you significantly increase the number
of
> data points graphed. When you zoom in close enough to begin seeing
> individual points, in addition to having many extra boxes, some boxes are
> apparently drawn too close to the edges because there is a wraparound
effect
> (giving rectangles spanning the graph rather than little boxes around the
> points).
>
> I also noticed in the example I provided, if you don't zoom in quite so
far,
> there are extra boxes drawn extending out of the left and right sides of
the
> graph. These boxes seem to correspond to data points outside the graph
> clipping area but within the canvas clipping area. I'm not sure if I would
> classify this behaviour as a bug or a feature... it could be useful and
may
> be intentional (i.e. a feature).
>
> Tony Colley
> ITT Industries A/CD
> Fort Wayne, IN USA
>
> Using ROOT 3.03/00, last updated from CVS on 18 Feb 2002, on RedHat Linux
> 7.2
>
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