PetscErrorCode VecView_MPI_Draw_DA1d(Vec xin,PetscViewer v)
{
DM da;
PetscErrorCode ierr;
PetscMPIInt rank,size,tag1,tag2;
PetscInt i,n,N,step,istart,isize,j,nbounds;
MPI_Status status;
PetscReal coors[4],ymin,ymax,min,max,xmin = 0.0,xmax = 0.0,tmp = 0.0,xgtmp = 0.0;
const PetscScalar *array,*xg;
PetscDraw draw;
PetscBool isnull,showpoints = PETSC_FALSE;
MPI_Comm comm;
PetscDrawAxis axis;
Vec xcoor;
DMBoundaryType bx;
const PetscReal *bounds;
PetscInt *displayfields;
PetscInt k,ndisplayfields;
PetscBool hold;
PetscFunctionBegin;
ierr = PetscViewerDrawGetDraw(v,0,&draw);CHKERRQ(ierr);
ierr = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr); if (isnull) PetscFunctionReturn(0);
ierr = PetscViewerDrawGetBounds(v,&nbounds,&bounds);CHKERRQ(ierr);
ierr = VecGetDM(xin,&da);CHKERRQ(ierr);
if (!da) SETERRQ(PetscObjectComm((PetscObject)xin),PETSC_ERR_ARG_WRONG,"Vector not generated from a DMDA");
ierr = PetscOptionsGetBool(NULL,"-draw_vec_mark_points",&showpoints,NULL);CHKERRQ(ierr);
ierr = DMDAGetInfo(da,0,&N,0,0,0,0,0,&step,0,&bx,0,0,0);CHKERRQ(ierr);
ierr = DMDAGetCorners(da,&istart,0,0,&isize,0,0);CHKERRQ(ierr);
ierr = VecGetArrayRead(xin,&array);CHKERRQ(ierr);
ierr = VecGetLocalSize(xin,&n);CHKERRQ(ierr);
n = n/step;
/* get coordinates of nodes */
ierr = DMGetCoordinates(da,&xcoor);CHKERRQ(ierr);
if (!xcoor) {
ierr = DMDASetUniformCoordinates(da,0.0,1.0,0.0,0.0,0.0,0.0);CHKERRQ(ierr);
ierr = DMGetCoordinates(da,&xcoor);CHKERRQ(ierr);
}
ierr = VecGetArrayRead(xcoor,&xg);CHKERRQ(ierr);
ierr = PetscObjectGetComm((PetscObject)xin,&comm);CHKERRQ(ierr);
ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr);
ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr);
/*
Determine the min and max x coordinate in plot
*/
if (!rank) {
xmin = PetscRealPart(xg[0]);
}
if (rank == size-1) {
xmax = PetscRealPart(xg[n-1]);
}
ierr = MPI_Bcast(&xmin,1,MPIU_REAL,0,comm);CHKERRQ(ierr);
ierr = MPI_Bcast(&xmax,1,MPIU_REAL,size-1,comm);CHKERRQ(ierr);
ierr = DMDASelectFields(da,&ndisplayfields,&displayfields);CHKERRQ(ierr);
for (k=0; k<ndisplayfields; k++) {
j = displayfields[k];
ierr = PetscViewerDrawGetDraw(v,k,&draw);CHKERRQ(ierr);
ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr);
/*
Determine the min and max y coordinate in plot
*/
min = 1.e20; max = -1.e20;
for (i=0; i<n; i++) {
if (PetscRealPart(array[j+i*step]) < min) min = PetscRealPart(array[j+i*step]);
if (PetscRealPart(array[j+i*step]) > max) max = PetscRealPart(array[j+i*step]);
}
if (min + 1.e-10 > max) {
min -= 1.e-5;
max += 1.e-5;
}
if (j < nbounds) {
min = PetscMin(min,bounds[2*j]);
max = PetscMax(max,bounds[2*j+1]);
}
ierr = MPI_Reduce(&min,&ymin,1,MPIU_REAL,MPIU_MIN,0,comm);CHKERRQ(ierr);
ierr = MPI_Reduce(&max,&ymax,1,MPIU_REAL,MPIU_MAX,0,comm);CHKERRQ(ierr);
ierr = PetscViewerDrawGetHold(v,&hold);CHKERRQ(ierr);
if (!hold) {
ierr = PetscDrawSynchronizedClear(draw);CHKERRQ(ierr);
}
ierr = PetscViewerDrawGetDrawAxis(v,k,&axis);CHKERRQ(ierr);
ierr = PetscLogObjectParent((PetscObject)draw,(PetscObject)axis);CHKERRQ(ierr);
if (!rank) {
const char *title;
ierr = PetscDrawAxisSetLimits(axis,xmin,xmax,ymin,ymax);CHKERRQ(ierr);
ierr = PetscDrawAxisDraw(axis);CHKERRQ(ierr);
ierr = PetscDrawGetCoordinates(draw,coors,coors+1,coors+2,coors+3);CHKERRQ(ierr);
ierr = DMDAGetFieldName(da,j,&title);CHKERRQ(ierr);
if (title) {ierr = PetscDrawSetTitle(draw,title);CHKERRQ(ierr);}
}
ierr = MPI_Bcast(coors,4,MPIU_REAL,0,comm);CHKERRQ(ierr);
if (rank) {
ierr = PetscDrawSetCoordinates(draw,coors[0],coors[1],coors[2],coors[3]);CHKERRQ(ierr);
}
/* draw local part of vector */
ierr = PetscObjectGetNewTag((PetscObject)xin,&tag1);CHKERRQ(ierr);
ierr = PetscObjectGetNewTag((PetscObject)xin,&tag2);CHKERRQ(ierr);
if (rank < size-1) { /*send value to right */
ierr = MPI_Send((void*)&array[j+(n-1)*step],1,MPIU_REAL,rank+1,tag1,comm);CHKERRQ(ierr);
ierr = MPI_Send((void*)&xg[n-1],1,MPIU_REAL,rank+1,tag1,comm);CHKERRQ(ierr);
}
if (!rank && bx == DM_BOUNDARY_PERIODIC && size > 1) { /* first processor sends first value to last */
ierr = MPI_Send((void*)&array[j],1,MPIU_REAL,size-1,tag2,comm);CHKERRQ(ierr);
}
for (i=1; i<n; i++) {
ierr = PetscDrawLine(draw,PetscRealPart(xg[i-1]),PetscRealPart(array[j+step*(i-1)]),PetscRealPart(xg[i]),PetscRealPart(array[j+step*i]),PETSC_DRAW_RED);CHKERRQ(ierr);
if (showpoints) {
ierr = PetscDrawPoint(draw,PetscRealPart(xg[i-1]),PetscRealPart(array[j+step*(i-1)]),PETSC_DRAW_BLACK);CHKERRQ(ierr);
}
}
if (rank) { /* receive value from left */
ierr = MPI_Recv(&tmp,1,MPIU_REAL,rank-1,tag1,comm,&status);CHKERRQ(ierr);
ierr = MPI_Recv(&xgtmp,1,MPIU_REAL,rank-1,tag1,comm,&status);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,xgtmp,tmp,PetscRealPart(xg[0]),PetscRealPart(array[j]),PETSC_DRAW_RED);CHKERRQ(ierr);
if (showpoints) {
ierr = PetscDrawPoint(draw,xgtmp,tmp,PETSC_DRAW_BLACK);CHKERRQ(ierr);
}
}
if (rank == size-1 && bx == DM_BOUNDARY_PERIODIC && size > 1) {
ierr = MPI_Recv(&tmp,1,MPIU_REAL,0,tag2,comm,&status);CHKERRQ(ierr);
/* If the mesh is not uniform we do not know the mesh spacing between the last point on the right and the first ghost point */
ierr = PetscDrawLine(draw,PetscRealPart(xg[n-1]),PetscRealPart(array[j+step*(n-1)]),PetscRealPart(xg[n-1]+(xg[n-1]-xg[n-2])),tmp,PETSC_DRAW_RED);CHKERRQ(ierr);
if (showpoints) {
ierr = PetscDrawPoint(draw,PetscRealPart(xg[n-2]),PetscRealPart(array[j+step*(n-1)]),PETSC_DRAW_BLACK);CHKERRQ(ierr);
}
}
ierr = PetscDrawSynchronizedFlush(draw);CHKERRQ(ierr);
ierr = PetscDrawPause(draw);CHKERRQ(ierr);
}
ierr = PetscFree(displayfields);CHKERRQ(ierr);
ierr = VecRestoreArrayRead(xcoor,&xg);CHKERRQ(ierr);
ierr = VecRestoreArrayRead(xin,&array);CHKERRQ(ierr);
PetscFunctionReturn(0);
}
void PETSC_STDCALL petscdrawpoint_(PetscDraw draw,PetscReal *xl,PetscReal *yl,int *cl, int *__ierr ){
*__ierr = PetscDrawPoint(
(PetscDraw)PetscToPointer((draw) ),*xl,*yl,*cl);
}