Canvas not showing on MacOS 10.15

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You need a TApplication

Updating canvas using TApplication

I would like to display graphics in a compiled program (using TApplication) where I can update the canvas with a press of a key. I tried this simple code (see below), but the line c1->Update() does not seem to display the new graphics nor does using the Draw() method. How can I refresh the canvas graphics? #include <iostream> #include "TMarker.h" #include "TApplication.h" #include "TCanvas.h" using namespace std; int main(int argc, char *argv[]) { TApplication *app = new TApplication("app",…