doc/v606/file_8C.html

void file(){


   TCanvas *c1 = new TCanvas("c1","ROOT File description",200,10,700,550);


   c1->Range(0,-0.25,21,14);

   TPaveLabel *title = new TPaveLabel(5,12,15,13.7,c1->GetTitle());

   title->SetFillColor(16);

   title->Draw();


   // horizonthal file layout

   TPave *file = new TPave(1,8.5,20,11);

   file->SetFillColor(11);

   file->Draw();

   TPave *fileh = new TPave(1,8.5,2.5,11);

   fileh->SetFillColor(44);

   fileh->Draw();

   TPave *lrh = new TPave(2.5,8.5,3.3,11,1);

   lrh->SetFillColor(33);

   lrh->Draw();

   lrh->DrawPave(6.9,8.5,7.7,11,1);

   lrh->DrawPave(10.5,8.5,11.3,11,1);

   lrh->DrawPave(14.5,8.5,15.3,11,1);

   TLine *ldot = new TLine(1,8.5,0.5,6.5);

   ldot->SetLineStyle(2);

   ldot->Draw();

   ldot->DrawLine(2.5, 8.5, 9.4, 6.5);

   ldot->DrawLine(10.5, 8.5, 10, 6.5);

   ldot->DrawLine(11.3, 8.5, 19.5, 6.5);

   TLine *line = new TLine(2.6,11,2.6,11.5);

   line->Draw();

   line->DrawLine(2.6,11.5,7,11.5);

   TArrow *arrow = new TArrow(7,11.5,7,11.1,0.01,"|>");

   arrow->SetFillStyle(1001);

   arrow->Draw();

   line->DrawLine( 7, 8.5, 7, 8.0);

   line->DrawLine( 7, 8.0, 10.6, 8);

   arrow->DrawArrow( 10.6,8, 10.6, 8.4,0.01,"|>");

   line->DrawLine( 10.6, 11, 10.6, 11.5);

   line->DrawLine( 10.6, 11.5, 14.6, 11.5);

   arrow->DrawArrow( 14.6,11.5, 14.6,11.1,0.01,"|>");

   line->DrawLine( 14.6, 8.5, 14.6, 8.0);

   line->DrawLine( 14.6, 8.0, 16, 8);

   ldot->DrawLine(16, 8, 19, 8);

   TText *vert = new TText(1.5,9.75,"File");

   vert->SetTextAlign(21);

   vert->SetTextAngle(90);

   vert->SetTextSize(0.025);

   vert->Draw();

   vert->DrawText(2.0, 9.75,"Header");

   vert->DrawText(2.9, 9.75,"Logical Record");

   vert->DrawText(3.2, 9.75,"Header");

   vert->DrawText(7.3, 9.75,"Logical Record");

   vert->DrawText(7.6, 9.75,"Header");

   vert->DrawText(10.9,9.75,"Logical Record");

   vert->DrawText(11.2,9.75,"Header");

   vert->DrawText(14.9,9.75,"Logical Record");

   vert->DrawText(15.2,9.75,"Header");

   TText *hori = new TText(4.75,10,"Object");

   hori->SetTextAlign(22);

   hori->SetTextSize(0.035);

   hori->Draw();

   hori->DrawText(4.75, 9.5,"Data");

   hori->DrawText(9.2, 10,"Deleted");

   hori->DrawText(9.2, 9.5,"Object");

   line->DrawLine( 6.9, 8.5, 10.5, 11);

   line->DrawLine( 6.9, 11, 10.5, 8.5);

   TText *tbig = new TText(17,9.75,"............");

   tbig->SetTextAlign(22);

   tbig->SetTextSize(0.03);

   tbig->Draw();

   tbig->DrawText(2.6, 7, "fBEGIN");

   tbig->DrawText(20., 7, "fEND");

   arrow->DrawArrow( 2.6,7, 2.6,8.4,0.01,"|>");

   arrow->DrawArrow( 20,7, 20,8.4,0.01,"|>");


   //file header

   TPaveText *header = new TPaveText(0.5,.2,9.4,6.5);

   header->SetFillColor(44);

   header->Draw();

   TText *fh=header->AddText("File Header");

   fh->SetTextAlign(22);

   fh->SetTextSize(0.04);

   header->SetTextSize(0.027);

   header->SetTextAlign(12);

   header->AddText(" ");

   header->AddLine(0,0,0,0);

   header->AddText("\"root\": Root File Identifier");

   header->AddText("fVersion: File version identifier");

   header->AddText("fBEGIN: Pointer to first data record");

   header->AddText("fEND: Pointer to first free word at EOF");

   header->AddText("fSeekFree: Pointer to FREE data record");

   header->AddText("fNbytesFree: Number of bytes in FREE");

   header->AddText("fNfree: Number of free data records");

   header->AddText("fNbytesName: Number of bytes in name/title");

   header->AddText("fUnits: Number of bytes for pointers");

   header->AddText("fCompress: Compression level");


   //logical record header

   TPaveText *lrecord = new TPaveText(10,0.2,19.5,6.5);

   lrecord->SetFillColor(33);

   lrecord->Draw();

   TText *tlrh=lrecord->AddText("Logical Record Header (TKEY)");

   tlrh->SetTextAlign(22);

   tlrh->SetTextSize(0.04);

   lrecord->SetTextSize(0.027);

   lrecord->SetTextAlign(12);

   lrecord->AddText(" ");

   lrecord->AddLine(0,0,0,0);

   lrecord->AddText("fNbytes: Length of compressed object");

   lrecord->AddText("fVersion: Key version identifier");

   lrecord->AddText("fObjLen: Length of uncompressed object");

   lrecord->AddText("fDatime: Date/Time when written to store");

   lrecord->AddText("fKeylen: Number of bytes for the key");

   lrecord->AddText("fCycle : Cycle number");

   lrecord->AddText("fSeekKey: Pointer to object on file");

   lrecord->AddText("fSeekPdir: Pointer to directory on file");

   lrecord->AddText("fClassName: class name of the object");

   lrecord->AddText("fName: name of the object");

   lrecord->AddText("fTitle: title of the object");


   c1->Update();

   c1->Print("file.png");

}