Hello everyone: I have been developing a GUI application, similiar to the guitest program, which allows a user to pull information from an Objectivity database, fill a Histogram or Graph object, and then draw it to a canvas. As I was adding some 2D histogram functionality, I ran into some odd occurences I was hoping someone on this list could assist me with. First, I discovered that, if I use the DrawCopy() function of a TH2D, the plot style always defaults to a scatter plot, no matter what options I give it. Draw() works normally, but I would like to use DrawCopy(), as it would allow the user to rotate Lego and Surface plots. Second, for some reason I cannot determine, whenever the 'SURF4' option is used, the surface always appears as pure white, with no shading whatsoever. To answer the obvious question, yes, I did change the color beforehand. I have been able to get the appropriate shading in a macro, but not in this application. Third, is it possible, in a standard 2D scatter plot, to increase the size of the points plotted? My application, at this time, typically involves a number of 'events' on the order of 50-100, rather than thousands. With the scatter plot points at their default size, the resultant plot is very hard to view. Other question I had regards 1D histograms -- is there some particular reason why they cannot seem to be drawn with a smooth curve or line AND markers? Whenever I try (in both macros and in my application) the resulting picture only includes markers. It is possible that some of my difficulties arise from the fact that I am not running off of cint -- my application functions as a stand-alone program, which simply includes the ROOT libraries and starts using them (much like guitest does). It occured to me that opperating in this manner may leave some important variables or objects (which cint might automatically define) undeterminate, thus causing some of the library functions to operate improperly. Are there any objects, other than a TROOT and a TApplication, which should be declared in a program such as this? I should point out that my main() function is virtually identical to the one used in guitest. Thank you all for you assistance. Ryan Roth, New List Member PHENIX, BNL rothr@db.erau.edu
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