canvas

//
// To see the output of this macro, click  here 
// One of the first actions in a ROOT session is the creation of a Canvas.
// Here we create a Canvas named "c1" with all default parameters
//
gROOT.Reset("c1");
TCanvas c1("c1");
//
// Inside this canvas, we create two pads
//
TPad pad1("pad1","This is pad1",0.05,0.52,0.90,0.45);
TPad pad2("pad2","This is pad2",0.05,0.02,0.90,0.45);
pad1.SetFillColor(46);
pad2.SetFillColor(46);
pad1.Draw();
pad2.Draw();
//
// A pad may contain other pads and graphics objects.
// We set the current pad to pad2. Note that the current pad is always highlighted.
//
pad2.cd();
TPad pad21("pad21","First subpad of pad2",0.02,0.05,0.46,0.90,17,3);
TPad pad22("pad22","Second subpad of pad2",0.52,0.05,0.46,0.90,17,3);
pad21.Draw();
pad22.Draw();
//
// We enter some primitives in the created pads and set some attributes
//
pad1.cd();
TText t1(0.5,0.8,"This is pad1");
t1.SetTextAlign(22);
t1.SetTextSize(0.2);
t1.Draw();
TLine line1(0.05,0.05,0.80,0.70);
line1.SetLineWidth(8);
line1.SetLineColor(2);
line1.Draw();
line1.DrawLine(0.6,0.1,0.9,0.9);
TLine line2(0.05,0.70,0.50,0.10);
line2.SetLineWidth(4);
line2.SetLineColor(5);
line2.Draw();
//
pad21.cd();
TText t21(0.05,0.8,"This is pad21");
t21.SetTextSize(0.1);
t21.Draw();
TPavesText paves(0.1,0.1,0.8,0.6);
paves.AddText("This is a PavesText");
paves.AddText("You can add new lines");
paves.AddText("Text formatting is automatic");
paves.SetFillColor(25);
paves.Draw();
pad22.cd();
TText t22(0.05,0.8,"This is pad22");
t22.SetTextSize(0.1);
t22.Draw();
TPaveLabel label(0.1,0.4,0.9,0.6,"This is a PaveLabel");
label.SetFillColor(24);
label.Draw();
//
// Try now to point on any object on the screen: pad, text, lines, etc.
// When the cursor points to sensitive areas in an object, the cursor
// shape changes and suggests the type of action that can be applied.
//
// For example, one can move, grow,shrink a pad.
// A text can be moved.
// A line can be moved or its end points can be modified.
// One can move, grow and shrink PaveLabels and PavesText.
// Try to change the canvas size.
// In the canvas "File" menu, select the option "Print" to produce
// a PostScript file with a copy of the canvas.