problem with some data structures

ulisseodisseo (3)
Hi at all...
I'm develop an application in c++, for the simulaiton of some particles. my problems is this:

1 - I created a data structure called grid (Inside the gridy, there is the gridLayer)
2 - I created a gridLayer(where there are the particles).Post the code of the h files

class Grid {
public:
Grid(float posX, float posY, float posZ, float rows, float cols);
Grid(const Grid& orig);
Grid();
virtual ~Grid();
void update();
void updatePressure();
void updateVelocity();
void updateViscosity();
void updateSurfaceTension();
void updateExternalForces();
std::vector<GridLayer> getGridLayer();
void addGridLayer(GridLayer g);
void updateGradientAS(VectorR r, float h, float sum, int index);
float getViscosity();
float getPressure();
float getVelocity();
float getDensityA();
void updateDensityA(VectorR r, float h);
float evaluateKernelWPoly6(VectorR r, float h);
float evaluateKernelWSpiky(VectorR r, float h);
float evaluateKernelViscosity(VectorR r, float h);
float evaluateSecondDerivateKernelViscosity(VectorR r, float h);
float evaluateParticleDensity(VectorR r, float h);
void evaluateParticlePressure(float k);
void evaluateExternalForces();
void evaluateViscosity(VectorR r, float h, float mu);
float evaluateVelocityJ(VectorR r, float h);
void resetDensityA();
void resetPressure();
void resetVelocity();
void resetViscosity();
void resetSurfaceTension();
void resetExternalForces();
float getPosX();
float getPosY();
float getPosZ();

private:
float posX;
float posY;
float posZ;
float rows;
float cols;
VectorR **gradientA;
std::vector<GridLayer> gridLayer;
};


class GridLayer {

public:
GridLayer(float labelI, float labelJ, float labelK);
GridLayer(const GridLayer& orig);
GridLayer();
virtual ~GridLayer();
int getParticlesNumber();
Particle getParticleAt(int index);
void addParticle(Particle p);
std::vector<Particle> getAllParticles();
void deleteParticleAt(int p);
void setDistributionAs(float d);
bool operator==(const GridLayer& gridA) const;
bool operator!=(const GridLayer& gridA) const;
GridLayer returnGrid();
float getLabelI();
float getLabelJ();
float getLabelK();

private:
float labelI;
float labelJ;
float labelK;
float distributionAs;
std::vector<Particle> particles;
};

When I create the grid in the main, I do that in the follow ways(for example, i create 2 grid)

Grid* grid[2];
grid[0] = new Grid(0.0,0.0,0.0,20.0,20.0);
grid[1] = new Grid(0.1, 0.1, 0.1,20,20);

//now, i create the gridLayer, and I insert the particle inside... one for each layer

for(int i = 0; i<2; i++)
GridLayer* gr = new GridLayer(newI, newJ, 0);
Particle* p = new Particle(1,1,1,newI,newJ,0,newI,newJ,0,1);
gr->addParticle(*p);
grid[0]->addGridLayer(*gr);
grid[1]->addGridLayer(*gr);

now, the problem is this:

In gridLayer I've a vector of Particle. The method addParticle defined in the h file and implemented in the cpp file, contain only this istruction

void GridLayer::addParticle(Particle p){
particles->push_bach(p);
}

but, when in the main I check the status of the particles, I don't have any particles in the vector. Infact, if in the main I do

grid[0]->getGridLayer().at(i).getParticlesNumber();

I 've, like size, a value 0 (the value should be 1), and I lost the particles.

(note, getParticlesNumber has only a instruction of return this->particles.size())

why? it's should be a problem about the passing of the variable for value or reference or wath?

NB: like test, I put a cout<"hello" instruction in the distructor of GridLayer and Particle, and, during the esecution, This is invoked (because I can see "hello" on my consolle) before the endo of the programm.

Thanks for an answer, please, help me.
jjose (3)
can u post the cpp files too?
ulisseodisseo (3)
mmmm I'm new of this forum... can you said me where can I post file inside? I don'ts nothing about upload procedure...
Jyy (17)
you only can post the code itself, between [code] tags ;)
ulisseodisseo (3)
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#include "GridLayer.h"
#include "Particle.h"
#include <vector>
#include <iostream>
using namespace std;
GridLayer::GridLayer(float lbI, float lbJ, float lbK) {

    this->labelI = lbI;
    this->labelJ = lbJ;
    this->labelK = lbK;

}

GridLayer::GridLayer()
{

}
GridLayer::GridLayer(const GridLayer& orig) : labelI(orig.labelI), labelJ(orig.labelJ), labelK(orig.labelI), distributionAs(orig.distributionAs)

{
}

GridLayer::~GridLayer() {
   
  }

int GridLayer::getParticlesNumber()
{
    return particles.size();
}


GridLayer GridLayer::returnGrid()
{
    return *this;

}


bool GridLayer::operator==(const GridLayer& grid) const
{
 if (this->labelI == grid.labelI && this->labelJ == grid.labelJ && this->labelK == grid.labelK)
   // if(this == &grid)
    return true;

    return false;
}

float GridLayer::getLabelI()
{
    return this->labelI;
}

float GridLayer::getLabelJ()

{
        return this->labelJ;
}

float GridLayer::getLabelK()
{
    return this->labelK;
}

bool GridLayer::operator!=(const GridLayer& grid) const
{
   //if (this->labelI != grid.getLabelI() || this->labelJ != grid.getLabelJ() || this->labelK != grid.getLabelK())
    if(this != &grid)
    return true;

    return false;
}
void GridLayer::deleteParticleAt(int position)
{  
    vector<Particle>::iterator iterator;
    iterator = this->particles.begin() + position;
    this->particles.erase(iterator);
}

Particle GridLayer::getParticleAt(int index)
{
    return this->particles.at(index);
}

void GridLayer::setDistributionAs(float d)
{  this->distributionAs = d;
}

vector<Particle> GridLayer::getAllParticles()
{  return this->particles;
}

void GridLayer::addParticle(Particle p)
{
    this->particles.push_back(p);
}


grid.cpp

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#include "GridLayer.h"
#include "Grid.h"
#include "Particle.h"
#include "VectorR.h"
#include <vector>
#include <math.h>
#include <iostream>
#include <GL/glut.h>

using namespace std;


Grid::Grid(float pX, float pY, float pZ,float rows, float cols) {

    this->posX = pX;
    this->posY = pY;
    this->posZ = pZ;
    this->rows = rows;
    this->cols = cols;

    
    

}


void Grid::addGridLayer(GridLayer g)
{
    this->gridLayer.push_back(g);
}

Grid::Grid(const Grid& g) : posX(g.posX), posY(g.posY), posZ(g.posZ),  rows(g.rows),  cols(g.cols),  gridLayer(g.gridLayer)

{

    

}


Grid::Grid()
{

    this->posX = 0;
    this->posY = 0;
    this->posZ = 0;
    this->rows = 0;
    this->cols = 0;
}
Grid::~Grid() {

    delete [] gradientA;
}

void Grid::updateDensityA(VectorR r, float h)
{
    float sum = 0;
    
        sum = 0;

        //first, I take the gridLyaer founded by the vector R
         vector<GridLayer> gridLayerTmp;
         
         //take the counter
         int counter = 0;
         // take a tmp counter for the cast
         float counterTmp = 0;

         for(float k = r.getZ(); k<=r.getZ()+h; k+=0.1)
         {
             //counterTMP * 10 because I need to cast the result to have an idnex
             counterTmp = k*10;
             counter = (int) counterTmp;
             if(&this->gridLayer.at(counter) != NULL)
                 gridLayerTmp.push_back(gridLayer.at(counter));

         }
        
        //now, I've the gridLayer along Z axys. I can evaluate the Density A fo every cell
         for(int i = 0; i<gridLayerTmp.size(); i++)
         {

             //I take all particles of the layer
             for(int j = 0; j<gridLayerTmp.at(i).getParticlesNumber(); j++)
             {
                 //check if I've a particles in a layer
                
                 if(&gridLayerTmp.at(i).getParticleAt(j)!=NULL)
                 {  //if a particle exist in a position individuated by a vector, a Take it
                     if(gridLayerTmp.at(i).getParticleAt(j).getWhereImX() <= r.getX()+h  && gridLayerTmp.at(i).getParticleAt(j).getWhereImY() <= r.getY()+h)
                     {

                         

                         Particle p = gridLayer.at(i).getParticleAt(i);
            VectorR ri(p.getPositionX(), p.getPositionY(), p.getPositionZ());
            r.sub(ri);
            sum = p.getMass()*(this->gridLayer.at(i).getParticlesNumber()/p.getDensity())*evaluateKernelWPoly6(r, h);
            this->gridLayer.at(i).setDistributionAs(sum);
                     }
                 
                 }
             }
         
              }

         //now call the gradient function
    

}

float Grid::evaluateParticleDensity(VectorR r, float h)
{

    float sum = 0;

        sum = 0;

        //first, I take the gridLyaer founded by the vector R
         vector<GridLayer> gridLayerTmp;

         //take the counter
         int counter = 0;
         // take a tmp counter for the cast
         float counterTmp = 0;

         for(float k = r.getZ(); k<=r.getZ()+h; k+=0.1)
         {
             //counterTMP * 10 because I need to cast the result to have an idnex
             counterTmp = k*10;
             counter = (int) counterTmp;
             if(&this->gridLayer.at(counter) != NULL)
                 gridLayerTmp.push_back(gridLayer.at(counter));

         }

        //now, I've the gridLayer along Z axys. I can evaluate the Density A fo every cell
         for(int i = 0; i<gridLayerTmp.size(); i++)
         {

             //I take all particles of the layer
             for(int j = 0; j<gridLayerTmp.at(i).getParticlesNumber(); j++)
             {
                 //check if I've a particles in a layer

                 if(&gridLayerTmp.at(i).getParticleAt(j)!=NULL)
                 {  //if a particle exist in a position individuated by a vector, a Take it
                     if(gridLayerTmp.at(i).getParticleAt(j).getWhereImX() <= r.getX()+h  && gridLayerTmp.at(i).getParticleAt(j).getWhereImY() <= r.getY()+h)
                     {
                         Particle p = gridLayer.at(i).getParticleAt(i);
            VectorR ri(p.getPositionX(), p.getPositionY(), p.getPositionZ());
            r.sub(ri);
            sum = p.getMass()*evaluateKernelWPoly6(r, h);
            this->gridLayer.at(i).setDistributionAs(sum);
                     }

                 }
             }

              }

}


float Grid::getPosX()
{
    return this->posX;
}

float Grid::getPosY()
{
    return this->posY;
}

float Grid::getPosZ()
{
    return this->posZ;
}

/* da eliminare
float Grid::getSizeX()
{
    return this->sizeX;
}


float Grid::getSizeY()
{
    return this->sizeY;
}

float Grid::getSizeZ()
{
    return this->sizeZ;
}

*/

float Grid::evaluateKernelWPoly6(VectorR r, float h)
{
    if (0 <= r.getModule() && r.getModule() <= h)
        return (315/(64*3.14159*powf(h,9)))*powf((powf(h,2)-powf(r.getModule(),2)),3);

    else
        return 0;

}

float Grid::evaluateKernelWSpiky(VectorR r, float h)
{
    if (0 <= r.getModule() && r.getModule() <= h)
        return (15/(3.14159*powf(h,6)))*powf((h-r.getModule()),3);

    else
        return 0;
}

float Grid::evaluateKernelViscosity(VectorR r, float h)
{
    if (0 <= r.getModule() && r.getModule() <= h)
        return ((15/2*3.14159*pow(h,3))*-(powf(r.getModule(),3)/(2*pow(h,3)))+powf(r.getModule(),2)/pow(h,2)+(h/2*r.getModule())-1);

    else
        return 0;

}




vector<GridLayer> Grid::getGridLayer()
{
    return this->gridLayer;
}


main (where I've the problem). The array is length 21, I put only 1 for simplfy
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Grid *grid[1] = new Grid(0,0,0,2,2);
   GridLayer gr(1,1,0);
    Particle p(1,1,1,1,1,0,1,1,0,1);
    gr.addParticle(p);
    grid[0]->addGridLayer(gr);
    GridLayer gr2(1,2,0);
    Particle p2(1,1,1,1,2,0,1,2,0,1);
    gr.addParticle(p2);
    grid[0]->addGridLayer(gr2);
    GridLayer gr3(2,1,0);
    Particle p3(1,1,1,2,1,0,2,1,0,1);
    gr.addParticle(p3);
    grid[0]->addGridLayer(gr3);
    GridLayer gr4(2,2,0);
    Particle p4(1,1,1,2,2,0,2,2,0,1);
    gr.addParticle(p4);
    grid[0]->addGridLayer(gr4);


but, when I make

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for(int h = 0; h<4; h++)
                        cout<<h<<" particelle:"<<grid[0]->getGridLayer().at(h).getParticlesNumber()<<" ";


the number of particle is 0
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