PetscErrorCode VecView_Seq_Draw_LG(Vec xin,PetscViewer v)
{
PetscDraw draw;
PetscBool isnull;
PetscDrawLG lg;
PetscErrorCode ierr;
PetscInt i,c,bs = PetscAbs(xin->map->bs),n = xin->map->n/bs;
const PetscScalar *xv;
PetscReal *xx,*yy;
int colors[] = {PETSC_DRAW_RED};
PetscFunctionBegin;
ierr = PetscViewerDrawGetDraw(v,0,&draw);CHKERRQ(ierr);
ierr = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr);
if (isnull) PetscFunctionReturn(0);
ierr = PetscMalloc2(n,&xx,n,&yy);CHKERRQ(ierr);
ierr = VecGetArrayRead(xin,&xv);CHKERRQ(ierr);
for (c=0; c<bs; c++) {
ierr = PetscViewerDrawGetDrawLG(v,c,&lg);CHKERRQ(ierr);
ierr = PetscDrawLGReset(lg);CHKERRQ(ierr);
ierr = PetscDrawLGSetDimension(lg,1);CHKERRQ(ierr);
ierr = PetscDrawLGSetColors(lg,colors);CHKERRQ(ierr);
for (i=0; i<n; i++) {
xx[i] = (PetscReal)i;
yy[i] = PetscRealPart(xv[c + i*bs]);
}
ierr = PetscDrawLGAddPoints(lg,n,&xx,&yy);CHKERRQ(ierr);
ierr = PetscDrawLGDraw(lg);CHKERRQ(ierr);
ierr = PetscDrawLGSave(lg);CHKERRQ(ierr);
}
ierr = VecRestoreArrayRead(xin,&xv);CHKERRQ(ierr);
ierr = PetscFree2(xx,yy);CHKERRQ(ierr);
PetscFunctionReturn(0);
}
PetscErrorCode VecView_Seq_Draw_LG(Vec xin,PetscViewer v)
{
PetscErrorCode ierr;
PetscInt i,c,bs = PetscAbs(xin->map->bs),n = xin->map->n/bs;
PetscDraw win;
PetscReal *xx;
PetscDrawLG lg;
const PetscScalar *xv;
PetscReal *yy;
PetscFunctionBegin;
ierr = PetscMalloc1(n,&xx);CHKERRQ(ierr);
ierr = PetscMalloc1(n,&yy);CHKERRQ(ierr);
ierr = VecGetArrayRead(xin,&xv);CHKERRQ(ierr);
for (c=0; c<bs; c++) {
ierr = PetscViewerDrawGetDrawLG(v,c,&lg);CHKERRQ(ierr);
ierr = PetscDrawLGGetDraw(lg,&win);CHKERRQ(ierr);
ierr = PetscDrawCheckResizedWindow(win);CHKERRQ(ierr);
ierr = PetscDrawLGReset(lg);CHKERRQ(ierr);
for (i=0; i<n; i++) {
xx[i] = (PetscReal) i;
yy[i] = PetscRealPart(xv[c + i*bs]);
}
ierr = PetscDrawLGAddPoints(lg,n,&xx,&yy);CHKERRQ(ierr);
ierr = PetscDrawLGDraw(lg);CHKERRQ(ierr);
ierr = PetscDrawSynchronizedFlush(win);CHKERRQ(ierr);
}
ierr = VecRestoreArrayRead(xin,&xv);CHKERRQ(ierr);
ierr = PetscFree(yy);CHKERRQ(ierr);
ierr = PetscFree(xx);CHKERRQ(ierr);
PetscFunctionReturn(0);
}