Hello all, I wrote a small online monitoring program displaying data from a Si detector. Mainly it consists of one acquisition method updating histograms and displaying them in different canvas. It works well and my only worry is the drawing speed. In some canvas I would like to have a "scope" mode displaying all events (namely 100 event/s when I do not draw those 512 bins histograms) but I can hardly draw 10 % of events. I use the standard method to update the drawing: if (fRawSelected && cnt%2 == 0 ) // Raw data canvas selected { fcRaw->cd(); // change to the canvas fHRaw[fCurrentEntry-1]->Draw(); // Histo drawing fcRaw->Modified(); // flag modified fcRaw->Update(); // Update the Pad } Is there any setting I can modify to improve the speed of this application? Many thanks in advance for the answer. Laurent Mirabito IPN Lyon
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