int main(int argc, char **argv)
{
DM dm, dmAdapt;
DMLabel adaptLabel;
PetscInt dim, nfaces, cStart, cEnd;
PetscBool interpolate;
PetscErrorCode ierr;
ierr = PetscInitialize(&argc,&argv,NULL,help);if (ierr) return ierr;
dim = 2;
nfaces = 3;
interpolate = PETSC_TRUE;
ierr = PetscOptionsBegin(PETSC_COMM_WORLD,NULL,"ex20",NULL);CHKERRQ(ierr);
ierr = PetscOptionsInt("-dim","domain dimension",NULL,dim,&dim,NULL);CHKERRQ(ierr);
ierr = PetscOptionsInt("-nfaces","number of faces per dimension",NULL,nfaces,&nfaces,NULL);CHKERRQ(ierr);
ierr = PetscOptionsEnd();CHKERRQ(ierr);
ierr = DMPlexCreateBoxMesh(PETSC_COMM_WORLD,dim,nfaces,interpolate,&dm);CHKERRQ(ierr);
ierr = PetscObjectSetName((PetscObject)dm,"Pre Adaptation Mesh");CHKERRQ(ierr);
ierr = DMViewFromOptions(dm,NULL,"-pre_adapt_dm_view");CHKERRQ(ierr);
ierr = DMPlexGetHeightStratum(dm,0,&cStart,&cEnd);CHKERRQ(ierr);
ierr = DMLabelCreate("adapt",&adaptLabel);CHKERRQ(ierr);
ierr = DMLabelSetDefaultValue(adaptLabel,DM_ADAPT_COARSEN);CHKERRQ(ierr);
if (cEnd > cStart) {ierr = DMLabelSetValue(adaptLabel,cStart,DM_ADAPT_REFINE);CHKERRQ(ierr);}
ierr = DMAdaptLabel(dm,adaptLabel,&dmAdapt);CHKERRQ(ierr);
ierr = PetscObjectSetName((PetscObject)dmAdapt,"Post Adaptation Mesh");CHKERRQ(ierr);
ierr = DMViewFromOptions(dmAdapt,NULL,"-post_adapt_dm_view");CHKERRQ(ierr);
ierr = DMDestroy(&dmAdapt);CHKERRQ(ierr);
ierr = DMLabelDestroy(&adaptLabel);CHKERRQ(ierr);
ierr = DMDestroy(&dm);CHKERRQ(ierr);
ierr = PetscFinalize();
return ierr;
}
static PetscErrorCode CreateAdaptivityLabel(DM forest,DMLabel *adaptLabel)
{
DMLabel identLabel;
PetscInt cStart, cEnd, c;
PetscErrorCode ierr;
PetscFunctionBegin;
ierr = DMLabelCreate("adapt",adaptLabel);CHKERRQ(ierr);
ierr = DMLabelSetDefaultValue(*adaptLabel,DM_ADAPT_COARSEN);CHKERRQ(ierr);
ierr = DMGetLabel(forest,"identity",&identLabel);CHKERRQ(ierr);
ierr = DMForestGetCellChart(forest,&cStart,&cEnd);CHKERRQ(ierr);
for (c = cStart; c < cEnd; c++) {
PetscInt basePoint;
ierr = DMLabelGetValue(identLabel,c,&basePoint);CHKERRQ(ierr);
if (!basePoint) {ierr = DMLabelSetValue(*adaptLabel,c,DM_ADAPT_REFINE);CHKERRQ(ierr);}
}
PetscFunctionReturn(0);
}
