Dear Experts,
Now I have a set of 3D data, and I want to draw a trajectory.
I tried TGraph2D(Int_t n, Float_t* x, Float_t* y, Float_t* z), and used Draw(“LP”) or Draw(“CP”).
But it can only gives scattering points but no line/curve.
So what options should I apply? Or is there better Class to draw it out?
Thank you very much!
&
Merry Christmas!
TGraph2D is not the right class.
Use TPolyLine3D
{
c1 = new TCanvas("c1","PolyLine3D & PolyMarker3D Window",200,10,500,500);
// Creating a view
TView3D *view = TView::CreateView(1);
view->SetRange(5,5,5,25,25,25);
// Create a first PolyLine3D
TPolyLine3D *pl3d1 = new TPolyLine3D(5);
pl3d1->SetPoint(0, 10, 10, 10);
pl3d1->SetPoint(1, 15, 15, 10);
pl3d1->SetPoint(2, 20, 15, 15);
pl3d1->SetPoint(3, 20, 20, 20);
pl3d1->SetPoint(4, 10, 10, 20);
// Create a first PolyMarker3D
TPolyMarker3D *pm3d1 = new TPolyMarker3D(12);
pm3d1->SetPoint(0, 10, 10, 10);
pm3d1->SetPoint(1, 11, 15, 11);
pm3d1->SetPoint(2, 12, 15, 9);
pm3d1->SetPoint(3, 13, 17, 20);
pm3d1->SetPoint(4, 14, 16, 15);
pm3d1->SetPoint(5, 15, 20, 15);
pm3d1->SetPoint(6, 16, 18, 10);
pm3d1->SetPoint(7, 17, 15, 10);
pm3d1->SetPoint(8, 18, 22, 15);
pm3d1->SetPoint(9, 19, 28, 25);
pm3d1->SetPoint(10, 20, 12, 15);
pm3d1->SetPoint(11, 21, 12, 15);
pm3d1->SetMarkerSize(2);
pm3d1->SetMarkerColor(4);
pm3d1->SetMarkerStyle(2);
// Draw
pl3d1->Draw();
pm3d1->Draw();
}
Thank you very much!
I’ll have a try.
Thank you very much again! It really works.
There is another question. Now I can plot a set of tracks, but how can I add the axis?
Thanks and Happy New Year!
Well that’s quite easy to find. Just have a look at the TView’s help.
root.cern.ch/root/html/TView.html
There is a method called ShowAxis() … Its name tells all … 
That’s very kind of you. Thank you so much!