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); }
/* This routine is not parallel */ PetscErrorCode MyMonitor(TS ts,PetscInt step,PetscReal time,Vec U,void *ptr) { UserCtx *ctx = (UserCtx*)ptr; PetscDrawLG lg; PetscErrorCode ierr; PetscScalar *u; PetscInt Mx,i,xs,xm,cnt; PetscReal x,y,hx,pause,sx,len,max,xx[2],yy[2]; PetscDraw draw; Vec localU; DM da; int colors[] = {PETSC_DRAW_YELLOW,PETSC_DRAW_RED,PETSC_DRAW_BLUE}; const char*const legend[] = {"-kappa (\\grad u,\\grad u)","(1 - u^2)^2"}; PetscDrawAxis axis; PetscDrawViewPorts *ports; PetscReal vbounds[] = {-1.1,1.1}; PetscFunctionBegin; ierr = PetscViewerDrawSetBounds(PETSC_VIEWER_DRAW_(PETSC_COMM_WORLD),1,vbounds);CHKERRQ(ierr); ierr = PetscViewerDrawResize(PETSC_VIEWER_DRAW_(PETSC_COMM_WORLD),1200,800);CHKERRQ(ierr); ierr = TSGetDM(ts,&da);CHKERRQ(ierr); ierr = DMGetLocalVector(da,&localU);CHKERRQ(ierr); ierr = DMDAGetInfo(da,PETSC_IGNORE,&Mx,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE,PETSC_IGNORE);CHKERRQ(ierr); ierr = DMDAGetCorners(da,&xs,NULL,NULL,&xm,NULL,NULL);CHKERRQ(ierr); hx = 1.0/(PetscReal)Mx; sx = 1.0/(hx*hx); ierr = DMGlobalToLocalBegin(da,U,INSERT_VALUES,localU);CHKERRQ(ierr); ierr = DMGlobalToLocalEnd(da,U,INSERT_VALUES,localU);CHKERRQ(ierr); ierr = DMDAVecGetArrayRead(da,localU,&u);CHKERRQ(ierr); ierr = PetscViewerDrawGetDrawLG(PETSC_VIEWER_DRAW_(PETSC_COMM_WORLD),1,&lg);CHKERRQ(ierr); ierr = PetscDrawLGGetDraw(lg,&draw);CHKERRQ(ierr); ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr); if (!ctx->ports) { ierr = PetscDrawViewPortsCreateRect(draw,1,3,&ctx->ports);CHKERRQ(ierr); } ports = ctx->ports; ierr = PetscDrawLGGetAxis(lg,&axis);CHKERRQ(ierr); ierr = PetscDrawLGReset(lg);CHKERRQ(ierr); xx[0] = 0.0; xx[1] = 1.0; cnt = 2; ierr = PetscOptionsGetRealArray(NULL,NULL,"-zoom",xx,&cnt,NULL);CHKERRQ(ierr); xs = xx[0]/hx; xm = (xx[1] - xx[0])/hx; /* Plot the energies */ ierr = PetscDrawLGSetDimension(lg,1 + (ctx->allencahn ? 1 : 0));CHKERRQ(ierr); ierr = PetscDrawLGSetColors(lg,colors+1);CHKERRQ(ierr); ierr = PetscDrawViewPortsSet(ports,2);CHKERRQ(ierr); x = hx*xs; for (i=xs; i<xs+xm; i++) { xx[0] = xx[1] = x; yy[0] = PetscRealPart(.25*ctx->kappa*(u[i-1] - u[i+1])*(u[i-1] - u[i+1])*sx); if (ctx->allencahn) yy[1] = .25*PetscRealPart((1. - u[i]*u[i])*(1. - u[i]*u[i])); ierr = PetscDrawLGAddPoint(lg,xx,yy);CHKERRQ(ierr); x += hx; } ierr = PetscDrawGetPause(draw,&pause);CHKERRQ(ierr); ierr = PetscDrawSetPause(draw,0.0);CHKERRQ(ierr); ierr = PetscDrawAxisSetLabels(axis,"Energy","","");CHKERRQ(ierr); ierr = PetscDrawLGSetLegend(lg,legend);CHKERRQ(ierr); ierr = PetscDrawLGDraw(lg);CHKERRQ(ierr); /* Plot the forces */ ierr = PetscDrawViewPortsSet(ports,1);CHKERRQ(ierr); ierr = PetscDrawLGReset(lg);CHKERRQ(ierr); x = xs*hx;; max = 0.; for (i=xs; i<xs+xm; i++) { xx[0] = xx[1] = x; yy[0] = PetscRealPart(ctx->kappa*(u[i-1] + u[i+1] - 2.0*u[i])*sx); max = PetscMax(max,PetscAbs(yy[0])); if (ctx->allencahn) { yy[1] = PetscRealPart(u[i] - u[i]*u[i]*u[i]); max = PetscMax(max,PetscAbs(yy[1])); } ierr = PetscDrawLGAddPoint(lg,xx,yy);CHKERRQ(ierr); x += hx; } ierr = PetscDrawAxisSetLabels(axis,"Right hand side","","");CHKERRQ(ierr); ierr = PetscDrawLGSetLegend(lg,NULL);CHKERRQ(ierr); ierr = PetscDrawLGDraw(lg);CHKERRQ(ierr); /* Plot the solution */ ierr = PetscDrawLGSetDimension(lg,1);CHKERRQ(ierr); ierr = PetscDrawViewPortsSet(ports,0);CHKERRQ(ierr); ierr = PetscDrawLGReset(lg);CHKERRQ(ierr); x = hx*xs; ierr = PetscDrawLGSetLimits(lg,x,x+(xm-1)*hx,-1.1,1.1);CHKERRQ(ierr); ierr = PetscDrawLGSetColors(lg,colors);CHKERRQ(ierr); for (i=xs; i<xs+xm; i++) { xx[0] = x; yy[0] = PetscRealPart(u[i]); ierr = PetscDrawLGAddPoint(lg,xx,yy);CHKERRQ(ierr); x += hx; } ierr = PetscDrawAxisSetLabels(axis,"Solution","","");CHKERRQ(ierr); ierr = PetscDrawLGDraw(lg);CHKERRQ(ierr); /* Print the forces as arrows on the solution */ x = hx*xs; cnt = xm/60; cnt = (!cnt) ? 1 : cnt; for (i=xs; i<xs+xm; i += cnt) { y = PetscRealPart(u[i]); len = .5*PetscRealPart(ctx->kappa*(u[i-1] + u[i+1] - 2.0*u[i])*sx)/max; ierr = PetscDrawArrow(draw,x,y,x,y+len,PETSC_DRAW_RED);CHKERRQ(ierr); if (ctx->allencahn) { len = .5*PetscRealPart(u[i] - u[i]*u[i]*u[i])/max; ierr = PetscDrawArrow(draw,x,y,x,y+len,PETSC_DRAW_BLUE);CHKERRQ(ierr); } x += cnt*hx; } ierr = DMDAVecRestoreArrayRead(da,localU,&x);CHKERRQ(ierr); ierr = DMRestoreLocalVector(da,&localU);CHKERRQ(ierr); ierr = PetscDrawStringSetSize(draw,.2,.2);CHKERRQ(ierr); ierr = PetscDrawFlush(draw);CHKERRQ(ierr); ierr = PetscDrawSetPause(draw,pause);CHKERRQ(ierr); ierr = PetscDrawPause(draw);CHKERRQ(ierr); PetscFunctionReturn(0); }