Cyril Broude wrote: > > -- > Hi, > > When painting TCutG's in line mode on a TH2 in a pad, everything is fine > when all > of the polyline is within the range of the pad or it is completely > outside of the range. However, if only some of the points are in the > pad, then TGraph::PaintGraph discards all of the external points and > happily joins up those which are inside. This would be alright for > PolyMarkers but not for PolyLines. > > What I would like to do is remove the above feature and add the > capability for > user SetClipRectangles to clip on the frame of the histogramme. Any > comments? > You are right about the expected TGraph behaviour. However, a correct clipping algorithm should work in the following situations: - polyline mode - polymarker mode - fill area mode - smooth mode for the 3 cases above - Graph with errors (in x and y) - Graph with associated fits. - histogram frame or not - clip by necessity (log scales) - clip on screen & Postscript The current "naive" algorithm is a minimum implementation for all cases above. Better algorithms will come with time. Rene Brun
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