Deleting Geometry Shape objects

From: Glen R. Salo (gsalo@mrcday.com)
Date: Fri Oct 09 1998 - 00:19:47 MEST 

Hi,

I'm trying to figure out how to delete the geometry shape objects.  I've tried
many thing, but I have not been able to completely remove memory leaks.  Below
is a sample code of what fails and how I am approaching the problem.

Thanks for all of your help.

#include "TROOT.h"
#include "TBRIK.h"
#include "TTUBE.h"
#include "TNode.h"
#include "TApplication.h"
#include "TCanvas.h"
#include "TRotMatrix.h"

extern void InitGui();
VoidFuncPtr_t initfuncs[] = {InitGui, 0};

TROOT root("Test","Test",initfuncs);

void create_wire( TNode *topNode );

int main(int argc, char **argv) {

  TBRIK *brick;
  TNode *topNode;
  TCanvas *c1;

  TApplication geomApp("testApp", 0, NULL);

   c1 = new TCanvas("c1","TestClass",500,500);

   // This loop shows how memory usage grows.  
   for (int i = 0; i < 200000; i++) {

     if ( i != 0 ) {
       // How do I delete all of the existing geometry shape, node, and rotation
       // matrix objects?  I wish it would be as simple as the following line.
       topNode->Delete();

       // What seems to work best but still has leaks and causes core dumps is:

       //      TNode *node;
       //      TObject *obj;
       //      TIter  next(topNode->GetListOfNodes());
       //      while ((obj = next())) {
       //        node = (TNode*)obj;
       //        node->GetShape()->Delete();
       //        node->Delete();
       //      }
    
       //      topNode->GetShape()->Delete();
       //      topNode->Delete();

     }

     brick = new TBRIK("invisible_brick","Brick","void",1.,1.,1.);
     topNode = new TNode("topNode","TopNode",brick,0,0,0,0);
     topNode->SetVisibility(2);
     topNode->cd();
     create_wire(topNode);
   
   }

   topNode->Draw();
   c1->Update();
      
   geomApp.Run();

   return(0);

}

void create_wire( TNode *topNode ) {

  TTUBE *wire;
  TNode *node;
  TRotMatrix *rot;

  topNode->cd();
  
  wire = new TTUBE("wire1","Wire","void",0.,1.,10.);
  wire->SetLineColor(20);
  
  rot = new TRotMatrix("rotate","Rotate",95.,10.,90.,100.,5.,10.);
  
  node = new TNode("node1","Node2",wire,0.,0.,0.,rot);
  
}


Glen

*********************************************************************

Glen R. Salo                                    g.r.salo@ieee.org
Mission Research Corporation                    (937)429-9261 Ext. 19
3975 Research Boulevard                         (937)429-2625 Fax
Dayton, Ohio 45430-2108

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