#include "TPad.h" #include "TCanvas.h" #include "TLine.h" void drawLine(){ // create a new canvas TCanvas* canvas = new TCanvas("canvas", "A Simple Canvas", 800, 600); // create a new pad on the canvas TPad* pad = new TPad("pad", "A Pad for Drawing", 0.1, 0.1, 0.9, 0.9); pad->Draw(); // create a line object TLine* line = new TLine(0, 0, 1, 1); // set the line color and width line->SetLineColor(kBlue); line->SetLineWidth(3); // draw the line on the pad pad->cd(); line->Draw(); }In this example code, we first create a new canvas and a new pad on it. We then create a line object, set its color and width, and draw it on the pad using the `Draw()` function. The package/library used in this example code is ROOT, which is a data analysis framework developed at CERN.