[C++ OPENGL] Dessiner un pauvre tube )=

struct point
{
    float x;
    float y;
    float z;
}; 
void Dessiner();
void Tube(float x, float y, float z, float rb, float rh, float h, int n);

   glBegin(GL_LINE_STRIP);

    glColor3ub(255,0,0); //face rouge
    glVertex3d(1.0,1.0,1.0);
    glVertex3d(1,1,-1);
    glVertex3d(-1,1,-1);
    glVertex3d(-1,1,1);    
    glEnd();
    glBegin(GL_LINE_STRIP);
    Tube(0,0,0,2,2,2,10);
    //Cornet(0,0,0,2,1,10);
    glEnd();

void Tube(float x, float y, float z, float rb, float rh, float h, int n)
{
     int i;
     point Pt[2*n];
     for(i=0;i<=n;i++)
     {
           Pt[i].x=x+cos(i/360*n)*rb;
           Pt[i].y=y;
           Pt[i].z=z+sin(i/360*n)*rb;  
     }
     for(i=n;i<=(2*n);i++)
     {
           Pt[i].x=x+cos(i/360*n)*rh;
           Pt[i].y=y+h;
           Pt[i].z=z+sin(i/360*n)*rh;  
     }
     for(i=1;i<n;i++)
     {
             glColor3ub(0,0,255);
             glVertex3d(Pt[i].x,Pt[i].y,Pt[i].z);
             glVertex3d(Pt[i+1].x,Pt[i+1].y,Pt[i+1].z);
             glVertex3d(Pt[i+n+1].x,Pt[i+n+1].y,Pt[i+n+1].z);
             glVertex3d(Pt[i+n].x,Pt[i+n].y,Pt[i+n].z);
     }
     
    glVertex3d(Pt[n].x,Pt[n].y,Pt[n].z);
    glVertex3d(Pt[1].x,Pt[1].y,Pt[1].z);
    glVertex3d(Pt[n+1].x,Pt[n+1].y,Pt[n+1].z);
    glVertex3d(Pt[2*n].x,Pt[2*n].y,Pt[2*n].z);
}