Hi Rene, Thanks, I knew I could draw the arrows using TArrow. What I have is a 6 dimensional array, 3 coordinates are position, 3 coordinates are a direction for that position (photon location and direction). I make a cut on which photons make it through an aperture and want to plot the location and direction of these photons. I was hoping there was a prebuilt way to do this. So first I plot the random mess of arrows and positions at the photon source. Then plot the same plot of photons which make it through the hole and see that all the arrows are pointing towards one location Something like: TH2Arrows(Float_t pos[2], Float_t dir[2]); TH3Arrows(Float_t pos[3], Float_t dir[3]); I did not expect these to be prebuilt but perhaps someone had an example readily available. I am sure I can come up with one if no one has one (so please don't take your time to do it if it's not ready). Cheers, Kevin |------------------------------------|---------------------------------| | Kevin Reil | 2575 Sand Hill Road, MS 26 | | X2447, 103D A&E Bldg. 041 | Menlo Park, CA 94025 | |------------------------------------|---------------------------------| | http://www.slac.stanford.edu/~reil | Office (650) 926-2447 | | reil@slac.stanford.edu | Home (650) 938-1767 | | http://reil.no-ip.org | Fax (650) 926-5368 | |----------------------------------------------------------------------| | And my father dwelt in a tent. | |----------------------------------------------------------------------| On Thu, 29 May 2003, Rene Brun wrote: >Hi Kevin, > >What is the problem? You can create a TArrow object for each >of your points (new TArrow(xmin,ymin,xmax,ymax)) >where xmin,ymin, etc are computed from the bin coordinates. >It may be more convenient to create one single TArrow, set >its graphics attributes (line width, angle, etc), >and use TArrow::DrawArrow to make a new instance. > >Note that you can also add the TArrow objects >to hist->GetListOfFunctions(). When drawing the histogram, >the arrows will be automatically drawn. > > >Rene Brun > >On Wed, 28 May >2003, Kevin Reil wrote: > >> Hi, >> >> I would like to ba able to draw an arrow on each point plotted in 2d and >> 3d histograms. >> >> IE at point (2,3) draw a unit arrow pointing in direction (1,0) >> and loop over points... >> >> Or >> at point (1,1,1) a unit arrow pointing in direction (0,1,1) >> and loop of points... >> >> etc >> >> Is there a quick way? >> >> Cheers, >> Kevin >> >> |------------------------------------|---------------------------------| >> | Kevin Reil | 2575 Sand Hill Road, MS 26 | >> | X2447, 103D A&E Bldg. 041 | Menlo Park, CA 94025 | >> |------------------------------------|---------------------------------| >> | http://www.slac.stanford.edu/~reil | Office (650) 926-2447 | >> | reil@slac.stanford.edu | Home (650) 938-1767 | >> | http://reil.no-ip.org | Fax (650) 926-5368 | >> |----------------------------------------------------------------------| >> | And my father dwelt in a tent. | >> |----------------------------------------------------------------------| >> > >
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