Show 3-d polymarker.

Author: Rene Brun
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Monday, August 15, 2022 at 09:36 AM.

In [1]:
gBenchmark->Start("tornado");

double PI = 3.141592653;
int d = 16;
int numberOfPoints=200;
int numberOfCircles=40;


create and open a canvas

In [2]:
TCanvas *sky = new TCanvas( "sky", "Tornado", 300, 10, 700, 500 );
sky->SetFillColor(14);


creating view

In [3]:
TView *view = TView::CreateView(1,0,0);
float range = numberOfCircles*d;
view->SetRange( 0, 0, 0, 4.0*range, 2.0*range, range );

for( int j = d; j < numberOfCircles*d; j += d ) {

// create a PolyMarker3D
TPolyMarker3D *pm3d = new TPolyMarker3D( numberOfPoints );

float x, y, z;

// set points
for( int i = 1; i < numberOfPoints; i++ ) {
float csin = sin(2*PI / (double)numberOfPoints  * (double)i) + 1;
float ccos = cos(2*PI / (double)numberOfPoints  * (double)i) + 1;
float esin = sin(2*PI / (double)(numberOfCircles*d) * (double)j) + 1;
x = j * ( csin + esin );
y = j * ccos;
z = j;
pm3d->SetPoint( i, x, y, z );
}

// set marker size, color & style
pm3d->SetMarkerSize( 1 );
pm3d->SetMarkerColor( 2 + ( d == ( j & d ) ) );
pm3d->SetMarkerStyle( 3 );

//draw
pm3d->Draw();
}

char timeStr[60];

sprintf( timeStr, "Execution time: %g sec.", ct);

TPaveText *text = new TPaveText( 0.1, 0.81, 0.9, 0.97 );
text->SetFillColor( 42 );

tornado   : Real Time =   1.98 seconds Cpu Time =   1.53 seconds

gROOT->GetListOfCanvases()->Draw()