impls/draw/drawv.c

#include <../src/sys/classes/viewer/impls/draw/vdraw.h> /*I "petscdraw.h" I*/
#include <petscviewer.h>                                /*I "petscviewer.h" I*/

static PetscErrorCode PetscViewerDestroy_Draw(PetscViewer v)
{
  PetscInt          i;
  PetscViewer_Draw *vdraw = (PetscViewer_Draw *)v->data;

  PetscFunctionBegin;
  PetscCheck(!vdraw->singleton_made, PETSC_COMM_SELF, PETSC_ERR_ORDER, "Destroying PetscViewer without first restoring singleton");
  for (i = 0; i < vdraw->draw_max; i++) {
    PetscCall(PetscDrawAxisDestroy(&vdraw->drawaxis[i]));
    PetscCall(PetscDrawLGDestroy(&vdraw->drawlg[i]));
    PetscCall(PetscDrawDestroy(&vdraw->draw[i]));
  }
  PetscCall(PetscFree(vdraw->display));
  PetscCall(PetscFree(vdraw->title));
  PetscCall(PetscFree3(vdraw->draw, vdraw->drawlg, vdraw->drawaxis));
  PetscCall(PetscFree(vdraw->bounds));
  PetscCall(PetscFree(vdraw->drawtype));
  PetscCall(PetscFree(v->data));
  PetscFunctionReturn(PETSC_SUCCESS);
}

static PetscErrorCode PetscViewerFlush_Draw(PetscViewer v)
{
  PetscInt          i;
  PetscViewer_Draw *vdraw = (PetscViewer_Draw *)v->data;

  PetscFunctionBegin;
  for (i = 0; i < vdraw->draw_max; i++) {
    if (vdraw->draw[i]) PetscCall(PetscDrawFlush(vdraw->draw[i]));
  }
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawBaseAdd - add to the base integer that is added to the `windownumber` passed to `PetscViewerDrawGetDraw()`

  Logically Collective

  Input Parameters:
+ viewer       - the `PetscViewer` (created with `PetscViewerDrawOpen()`)
- windownumber - how much to add to the base

  Level: developer

  Note:
  A `PETSCVIEWERDRAW` may have multiple `PetscDraw` subwindows, this increases the number of the subwindow that is returned with `PetscViewerDrawGetDraw()`

.seealso: [](sec_viewers), `PetscViewerDrawGetLG()`, `PetscViewerDrawGetAxis()`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`, `PetscViewerDrawBaseSet()`
@*/
PetscErrorCode PetscViewerDrawBaseAdd(PetscViewer viewer, PetscInt windownumber)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscValidLogicalCollectiveInt(viewer, windownumber, 2);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  PetscCheck(isdraw, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Must be draw type PetscViewer");
  vdraw = (PetscViewer_Draw *)viewer->data;

  PetscCheck(windownumber + vdraw->draw_base >= 0, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Resulting base %" PetscInt_FMT " cannot be negative", windownumber + vdraw->draw_base);
  vdraw->draw_base += windownumber;
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawBaseSet - sets the base integer that is added to the `windownumber` passed to `PetscViewerDrawGetDraw()`

  Logically Collective

  Input Parameters:
+ viewer       - the `PetscViewer` (created with `PetscViewerDrawOpen()`)
- windownumber - value to set the base

  Level: developer

  Note:
  A `PETSCVIEWERDRAW` may have multiple `PetscDraw` subwindows, this increases the number of the subwindow that is returned with `PetscViewerDrawGetDraw()`

.seealso: [](sec_viewers), `PetscViewerDrawGetLG()`, `PetscViewerDrawGetAxis()`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`, `PetscViewerDrawBaseAdd()`
@*/
PetscErrorCode PetscViewerDrawBaseSet(PetscViewer viewer, PetscInt windownumber)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscValidLogicalCollectiveInt(viewer, windownumber, 2);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  PetscCheck(isdraw, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Must be draw type PetscViewer");
  vdraw = (PetscViewer_Draw *)viewer->data;

  PetscCheck(windownumber >= 0, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Resulting base %" PetscInt_FMT " cannot be negative", windownumber);
  vdraw->draw_base = windownumber;
  PetscFunctionReturn(PETSC_SUCCESS);
}

PetscErrorCode PetscViewerDrawResize(PetscViewer v, int w, int h)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(v, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)v, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) PetscFunctionReturn(PETSC_SUCCESS);
  vdraw = (PetscViewer_Draw *)v->data;

  if (w >= 1) vdraw->w = w;
  if (h >= 1) vdraw->h = h;
  PetscFunctionReturn(PETSC_SUCCESS);
}

PetscErrorCode PetscViewerDrawSetInfo(PetscViewer v, const char display[], const char title[], int x, int y, int w, int h)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(v, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)v, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) PetscFunctionReturn(PETSC_SUCCESS);
  vdraw = (PetscViewer_Draw *)v->data;

  PetscCall(PetscStrallocpy(display, &vdraw->display));
  PetscCall(PetscStrallocpy(title, &vdraw->title));
  if (w >= 1) vdraw->w = w;
  if (h >= 1) vdraw->h = h;
  PetscFunctionReturn(PETSC_SUCCESS);
}

PetscErrorCode PetscViewerDrawSetTitle(PetscViewer v, const char title[])
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(v, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)v, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) PetscFunctionReturn(PETSC_SUCCESS);
  vdraw = (PetscViewer_Draw *)v->data;

  PetscCall(PetscFree(vdraw->title));
  PetscCall(PetscStrallocpy(title, &vdraw->title));
  PetscFunctionReturn(PETSC_SUCCESS);
}

PetscErrorCode PetscViewerDrawGetTitle(PetscViewer v, const char *title[])
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(v, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)v, PETSCVIEWERDRAW, &isdraw));
  PetscCheck(isdraw, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Must be draw type PetscViewer");
  vdraw = (PetscViewer_Draw *)v->data;

  *title = vdraw->title;
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawOpen - Opens a `PetscDraw` window for use as a `PetscViewer` with type
  `PETSCVIEWERDRAW`.

  Collective

  Input Parameters:
+ comm    - communicator that will share window
. display - the X display on which to open, or `NULL` for the local machine
. title   - the title to put in the title bar, or `NULL` for no title
. x       - horizontal screen coordinate of the upper left corner of window, or use `PETSC_DECIDE`
. y       - vertical screen coordinate of the upper left corner of window, or use `PETSC_DECIDE`
. w       - window width in pixels, or may use `PETSC_DECIDE` or `PETSC_DRAW_FULL_SIZE`, `PETSC_DRAW_HALF_SIZE`,`PETSC_DRAW_THIRD_SIZE`, `PETSC_DRAW_QUARTER_SIZE`
- h       - window height in pixels, or may use `PETSC_DECIDE` or `PETSC_DRAW_FULL_SIZE`, `PETSC_DRAW_HALF_SIZE`,`PETSC_DRAW_THIRD_SIZE`, `PETSC_DRAW_QUARTER_SIZE`

  Output Parameter:
. viewer - the `PetscViewer`

  Options Database Keys:
+ -draw_type          - use x or null
. -nox                - Disables all x-windows output
. -display <name>     - Specifies name of machine for the X display
. -geometry <x,y,w,h> - allows setting the window location and size
- -draw_pause <pause> - Sets time (in seconds) that the
     program pauses after PetscDrawPause() has been called
     (0 is default, -1 implies until user input).

  Level: beginner

  Notes:
  If you want to do graphics in this window, you must call `PetscViewerDrawGetDraw()` and
  perform the graphics on the `PetscDraw` object.

  Format options include\:
+ `PETSC_VIEWER_DRAW_BASIC` - displays with basic format
- `PETSC_VIEWER_DRAW_LG`    - displays using a line graph

  Fortran Notes:
  Whenever indicating null character data in a Fortran code,
  `PETSC_NULL_CHARACTER` must be employed; using NULL is not
  correct for character data!  Thus, `PETSC_NULL_CHARACTER` can be
  used for the display and title input parameters.

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscDrawCreate()`, `PetscViewerDestroy()`, `PetscViewerDrawGetDraw()`, `PetscViewerCreate()`, `PETSC_VIEWER_DRAW_`,
          `PETSC_VIEWER_DRAW_WORLD`, `PETSC_VIEWER_DRAW_SELF`
@*/
PetscErrorCode PetscViewerDrawOpen(MPI_Comm comm, const char display[], const char title[], int x, int y, int w, int h, PetscViewer *viewer)
{
  PetscFunctionBegin;
  PetscCall(PetscViewerCreate(comm, viewer));
  PetscCall(PetscViewerSetType(*viewer, PETSCVIEWERDRAW));
  PetscCall(PetscViewerDrawSetInfo(*viewer, display, title, x, y, w, h));
  PetscFunctionReturn(PETSC_SUCCESS);
}

#include <petsc/private/drawimpl.h>

static PetscErrorCode PetscViewerGetSubViewer_Draw(PetscViewer viewer, MPI_Comm comm, PetscViewer *sviewer)
{
  PetscMPIInt       rank;
  PetscInt          i;
  PetscViewer_Draw *vdraw = (PetscViewer_Draw *)viewer->data, *svdraw;

  PetscFunctionBegin;
  PetscCheck(!vdraw->singleton_made, PETSC_COMM_SELF, PETSC_ERR_ORDER, "Trying to get SubViewer without first restoring previous");
  /* only processor zero can use the PetscViewer draw singleton */
  PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)viewer), &rank));
  if (rank == 0) {
    PetscMPIInt flg;
    PetscDraw   draw, sdraw;

    PetscCallMPI(MPI_Comm_compare(PETSC_COMM_SELF, comm, &flg));
    PetscCheck(flg == MPI_IDENT || flg == MPI_CONGRUENT, PETSC_COMM_SELF, PETSC_ERR_SUP, "PetscViewerGetSubViewer() for PETSCVIEWERDRAW requires a singleton MPI_Comm");
    PetscCall(PetscViewerCreate(comm, sviewer));
    PetscCall(PetscViewerSetType(*sviewer, PETSCVIEWERDRAW));
    svdraw             = (PetscViewer_Draw *)(*sviewer)->data;
    (*sviewer)->format = viewer->format;
    for (i = 0; i < vdraw->draw_max; i++) { /* XXX this is wrong if svdraw->draw_max (initially 5) < vdraw->draw_max */
      if (vdraw->draw[i]) PetscCall(PetscDrawGetSingleton(vdraw->draw[i], &svdraw->draw[i]));
    }
    PetscCall(PetscViewerDrawGetDraw(viewer, 0, &draw));
    PetscCall(PetscViewerDrawGetDraw(*sviewer, 0, &sdraw));
    if (draw->savefilename) {
      PetscCall(PetscDrawSetSave(sdraw, draw->savefilename));
      sdraw->savefilecount  = draw->savefilecount;
      sdraw->savesinglefile = draw->savesinglefile;
      sdraw->savemoviefps   = draw->savemoviefps;
      sdraw->saveonclear    = draw->saveonclear;
      sdraw->saveonflush    = draw->saveonflush;
    }
    if (draw->savefinalfilename) PetscCall(PetscDrawSetSaveFinalImage(sdraw, draw->savefinalfilename));
  } else {
    PetscDraw draw;
    PetscCall(PetscViewerDrawGetDraw(viewer, 0, &draw));
  }
  vdraw->singleton_made = PETSC_TRUE;
  PetscFunctionReturn(PETSC_SUCCESS);
}

static PetscErrorCode PetscViewerRestoreSubViewer_Draw(PetscViewer viewer, MPI_Comm comm, PetscViewer *sviewer)
{
  PetscMPIInt       rank;
  PetscInt          i;
  PetscViewer_Draw *vdraw = (PetscViewer_Draw *)viewer->data, *svdraw;

  PetscFunctionBegin;
  PetscCheck(vdraw->singleton_made, PETSC_COMM_SELF, PETSC_ERR_ORDER, "Trying to restore a singleton that was not gotten");
  PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)viewer), &rank));
  if (rank == 0) {
    PetscDraw draw, sdraw;

    PetscCall(PetscViewerDrawGetDraw(viewer, 0, &draw));
    PetscCall(PetscViewerDrawGetDraw(*sviewer, 0, &sdraw));
    if (draw->savefilename) {
      draw->savefilecount = sdraw->savefilecount;
      PetscCallMPI(MPI_Bcast(&draw->savefilecount, 1, MPIU_INT, 0, PetscObjectComm((PetscObject)draw)));
    }
    svdraw = (PetscViewer_Draw *)(*sviewer)->data;
    for (i = 0; i < vdraw->draw_max; i++) {
      if (vdraw->draw[i] && svdraw->draw[i]) PetscCall(PetscDrawRestoreSingleton(vdraw->draw[i], &svdraw->draw[i]));
    }
    PetscCall(PetscFree3(svdraw->draw, svdraw->drawlg, svdraw->drawaxis));
    PetscCall(PetscFree((*sviewer)->data));
    PetscCall(PetscHeaderDestroy(sviewer));
  } else {
    PetscDraw draw;

    PetscCall(PetscViewerDrawGetDraw(viewer, 0, &draw));
    if (draw->savefilename) PetscCallMPI(MPI_Bcast(&draw->savefilecount, 1, MPIU_INT, 0, PetscObjectComm((PetscObject)draw)));
  }

  vdraw->singleton_made = PETSC_FALSE;
  PetscFunctionReturn(PETSC_SUCCESS);
}

static PetscErrorCode PetscViewerSetFromOptions_Draw(PetscViewer v, PetscOptionItems PetscOptionsObject)
{
  PetscReal bounds[16];
  PetscInt  nbounds = 16;
  PetscBool flg;

  PetscFunctionBegin;
  PetscOptionsHeadBegin(PetscOptionsObject, "Draw PetscViewer Options");
  PetscCall(PetscOptionsRealArray("-draw_bounds", "Bounds to put on plots axis", "PetscViewerDrawSetBounds", bounds, &nbounds, &flg));
  if (flg) PetscCall(PetscViewerDrawSetBounds(v, nbounds / 2, bounds));
  PetscOptionsHeadEnd();
  PetscFunctionReturn(PETSC_SUCCESS);
}

static PetscErrorCode PetscViewerView_Draw(PetscViewer viewer, PetscViewer v)
{
  PetscDraw         draw;
  PetscInt          i;
  PetscViewer_Draw *vdraw = (PetscViewer_Draw *)viewer->data;
  PetscBool         iascii;

  PetscFunctionBegin;
  PetscCall(PetscObjectTypeCompare((PetscObject)v, PETSCVIEWERASCII, &iascii));
  if (iascii) PetscCall(PetscViewerASCIIPrintf(v, "Draw viewer is of type %s\n", vdraw->drawtype));
  /*  If the PetscViewer has just been created then no vdraw->draw yet
      exists so this will not actually call the viewer on any draws. */
  for (i = 0; i < vdraw->draw_base; i++) {
    if (vdraw->draw[i]) {
      PetscCall(PetscViewerDrawGetDraw(viewer, i, &draw));
      PetscCall(PetscDrawView(draw, v));
    }
  }
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*MC
   PETSCVIEWERDRAW - A viewer that generates graphics, either to the screen or a file

  Level: beginner

.seealso: [](sec_viewers), `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`, `PETSC_VIEWER_DRAW_()`, `PETSC_VIEWER_DRAW_SELF`, `PETSC_VIEWER_DRAW_WORLD`,
          `PetscViewerCreate()`, `PetscViewerASCIIOpen()`, `PetscViewerBinaryOpen()`, `PETSCVIEWERBINARY`,
          `PetscViewerMatlabOpen()`, `VecView()`, `DMView()`, `PetscViewerMatlabPutArray()`, `PETSCVIEWERASCII`, `PETSCVIEWERMATLAB`,
          `PetscViewerFileSetName()`, `PetscViewerFileSetMode()`, `PetscViewerFormat`, `PetscViewerType`, `PetscViewerSetType()`
M*/
PETSC_EXTERN PetscErrorCode PetscViewerCreate_Draw(PetscViewer viewer)
{
  PetscViewer_Draw *vdraw;

  PetscFunctionBegin;
  PetscCall(PetscNew(&vdraw));
  viewer->data = (void *)vdraw;

  viewer->ops->flush            = PetscViewerFlush_Draw;
  viewer->ops->view             = PetscViewerView_Draw;
  viewer->ops->destroy          = PetscViewerDestroy_Draw;
  viewer->ops->setfromoptions   = PetscViewerSetFromOptions_Draw;
  viewer->ops->getsubviewer     = PetscViewerGetSubViewer_Draw;
  viewer->ops->restoresubviewer = PetscViewerRestoreSubViewer_Draw;

  /* these are created on the fly if requested */
  vdraw->draw_max  = 5;
  vdraw->draw_base = 0;
  vdraw->w         = PETSC_DECIDE;
  vdraw->h         = PETSC_DECIDE;

  PetscCall(PetscCalloc3(vdraw->draw_max, &vdraw->draw, vdraw->draw_max, &vdraw->drawlg, vdraw->draw_max, &vdraw->drawaxis));
  vdraw->singleton_made = PETSC_FALSE;
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawClear - Clears a `PetscDraw` graphic associated with a `PetscViewer`.

  Not Collective

  Input Parameter:
. viewer - the `PetscViewer`

  Level: intermediate

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`,
@*/
PetscErrorCode PetscViewerDrawClear(PetscViewer viewer)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;
  PetscInt          i;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) PetscFunctionReturn(PETSC_SUCCESS);
  vdraw = (PetscViewer_Draw *)viewer->data;

  for (i = 0; i < vdraw->draw_max; i++) {
    if (vdraw->draw[i]) PetscCall(PetscDrawClear(vdraw->draw[i]));
  }
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawGetPause - Gets the pause value (how long to pause before an image is changed)  in the `PETSCVIEWERDRAW` `PetscViewer`

  Not Collective

  Input Parameter:
. viewer - the `PetscViewer`

  Output Parameter:
. pause - the pause value

  Level: intermediate

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`,
@*/
PetscErrorCode PetscViewerDrawGetPause(PetscViewer viewer, PetscReal *pause)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;
  PetscInt          i;
  PetscDraw         draw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) {
    *pause = 0.0;
    PetscFunctionReturn(PETSC_SUCCESS);
  }
  vdraw = (PetscViewer_Draw *)viewer->data;

  for (i = 0; i < vdraw->draw_max; i++) {
    if (vdraw->draw[i]) {
      PetscCall(PetscDrawGetPause(vdraw->draw[i], pause));
      PetscFunctionReturn(PETSC_SUCCESS);
    }
  }
  /* none exist yet so create one and get its pause */
  PetscCall(PetscViewerDrawGetDraw(viewer, 0, &draw));
  PetscCall(PetscDrawGetPause(draw, pause));
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawSetPause - Sets a pause for each `PetscDraw` in the `PETSCVIEWERDRAW` `PetscViewer`

  Not Collective

  Input Parameters:
+ viewer - the `PetscViewer`
- pause  - the pause value

  Level: intermediate

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`,
@*/
PetscErrorCode PetscViewerDrawSetPause(PetscViewer viewer, PetscReal pause)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;
  PetscInt          i;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) PetscFunctionReturn(PETSC_SUCCESS);
  vdraw = (PetscViewer_Draw *)viewer->data;

  vdraw->pause = pause;
  for (i = 0; i < vdraw->draw_max; i++) {
    if (vdraw->draw[i]) PetscCall(PetscDrawSetPause(vdraw->draw[i], pause));
  }
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawSetHold - Holds previous image when drawing new image in a `PETSCVIEWERDRAW`

  Not Collective

  Input Parameters:
+ viewer - the `PetscViewer`
- hold   - `PETSC_TRUE` indicates to hold the previous image

  Level: intermediate

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`,
@*/
PetscErrorCode PetscViewerDrawSetHold(PetscViewer viewer, PetscBool hold)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) PetscFunctionReturn(PETSC_SUCCESS);
  vdraw = (PetscViewer_Draw *)viewer->data;

  vdraw->hold = hold;
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@
  PetscViewerDrawGetHold - Checks if the `PETSCVIEWERDRAW` `PetscViewer` holds previous image when drawing new image

  Not Collective

  Input Parameter:
. viewer - the `PetscViewer`

  Output Parameter:
. hold - indicates to hold or not

  Level: intermediate

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`,
@*/
PetscErrorCode PetscViewerDrawGetHold(PetscViewer viewer, PetscBool *hold)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) {
    *hold = PETSC_FALSE;
    PetscFunctionReturn(PETSC_SUCCESS);
  }
  vdraw = (PetscViewer_Draw *)viewer->data;

  *hold = vdraw->hold;
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*
    The variable Petsc_Viewer_Draw_keyval is used to indicate an MPI attribute that
  is attached to a communicator, in this case the attribute is a PetscViewer.
*/
PetscMPIInt Petsc_Viewer_Draw_keyval = MPI_KEYVAL_INVALID;

/*@C
   PETSC_VIEWER_DRAW_ - Creates a window `PETSCVIEWERDRAW` `PetscViewer` shared by all processors
                     in an MPI communicator.

   Collective

   Input Parameter:
.  comm - the MPI communicator to share the window `PetscViewer`

   Level: intermediate

   Notes:
   This object is destroyed in `PetscFinalize()`, `PetscViewerDestroy()` should never be called on it

   Unlike almost all other PETSc routines, `PETSC_VIEWER_DRAW_()` does not return
   an error code.  The window is usually used in the form
.vb
   XXXView(XXX object, PETSC_VIEWER_DRAW_(comm));
.ve

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewer`, `PETSC_VIEWER_DRAW_WORLD`, `PETSC_VIEWER_DRAW_SELF`, `PetscViewerDrawOpen()`,
@*/
PetscViewer PETSC_VIEWER_DRAW_(MPI_Comm comm)
{
  PetscMPIInt flag;
  PetscViewer viewer;
  MPI_Comm    ncomm;

  PetscFunctionBegin;
  PetscCallNull(PetscCommDuplicate(comm, &ncomm, NULL));
  if (Petsc_Viewer_Draw_keyval == MPI_KEYVAL_INVALID) { PetscCallMPINull(MPI_Comm_create_keyval(MPI_COMM_NULL_COPY_FN, MPI_COMM_NULL_DELETE_FN, &Petsc_Viewer_Draw_keyval, NULL)); }
  PetscCallMPINull(MPI_Comm_get_attr(ncomm, Petsc_Viewer_Draw_keyval, (void **)&viewer, &flag));
  if (!flag) { /* PetscViewer not yet created */
    PetscCallNull(PetscViewerDrawOpen(ncomm, NULL, NULL, PETSC_DECIDE, PETSC_DECIDE, 300, 300, &viewer));
    PetscCallNull(PetscObjectRegisterDestroy((PetscObject)viewer));
    PetscCallMPINull(MPI_Comm_set_attr(ncomm, Petsc_Viewer_Draw_keyval, (void *)viewer));
  }
  PetscCallNull(PetscCommDestroy(&ncomm));
  PetscFunctionReturn(viewer);
}

/*@
  PetscViewerDrawSetBounds - sets the upper and lower bounds to be used in plotting in a `PETSCVIEWERDRAW` `PetscViewer`

  Collective

  Input Parameters:
+ viewer  - the Petsc`Viewer` (created with `PetscViewerDrawOpen()`)
. nbounds - number of plots that can be made with this viewer, for example the dof passed to `DMDACreate()`
- bounds  - the actual bounds, the size of this is 2*`nbounds`, the values are stored in the order min F_0, max F_0, min F_1, max F_1, .....

  Options Database Key:
. -draw_bounds  minF0,maxF0,minF1,maxF1 - the lower left and upper right bounds

  Level: intermediate

  Note:
  this determines the colors used in 2d contour plots generated with VecView() for `DMDA` in 2d. Any values in the vector below or above the
  bounds are moved to the bound value before plotting. In this way the color index from color to physical value remains the same for all plots generated with
  this viewer. Otherwise the color to physical value meaning changes with each new image if this is not set.

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewerDrawGetLG()`, `PetscViewerDrawGetAxis()`, `PetscViewerDrawOpen()`
@*/
PetscErrorCode PetscViewerDrawSetBounds(PetscViewer viewer, PetscInt nbounds, const PetscReal *bounds)
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) PetscFunctionReturn(PETSC_SUCCESS);
  vdraw = (PetscViewer_Draw *)viewer->data;

  vdraw->nbounds = nbounds;
  PetscCall(PetscFree(vdraw->bounds));
  PetscCall(PetscMalloc1(2 * nbounds, &vdraw->bounds));
  PetscCall(PetscArraycpy(vdraw->bounds, bounds, 2 * nbounds));
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@C
  PetscViewerDrawGetBounds - gets the upper and lower bounds to be used in plotting set with `PetscViewerDrawSetBounds()`

  Collective

  Input Parameter:
. viewer - the `PetscViewer` (created with `PetscViewerDrawOpen()`)

  Output Parameters:
+ nbounds - number of plots that can be made with this viewer, for example the dof passed to `DMDACreate()`
- bounds  - the actual bounds, the size of this is 2*`nbounds`, the values are stored in the order min F_0, max F_0, min F_1, max F_1, .....

  Level: intermediate

.seealso: [](sec_viewers), `PETSCVIEWERDRAW`, `PetscViewerDrawGetLG()`, `PetscViewerDrawGetAxis()`, `PetscViewerDrawOpen()`, `PetscViewerDrawSetBounds()`
@*/
PetscErrorCode PetscViewerDrawGetBounds(PetscViewer viewer, PetscInt *nbounds, const PetscReal *bounds[])
{
  PetscViewer_Draw *vdraw;
  PetscBool         isdraw;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer, PETSC_VIEWER_CLASSID, 1);
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
  if (!isdraw) {
    if (nbounds) *nbounds = 0;
    if (bounds) *bounds = NULL;
    PetscFunctionReturn(PETSC_SUCCESS);
  }
  vdraw = (PetscViewer_Draw *)viewer->data;

  if (nbounds) *nbounds = vdraw->nbounds;
  if (bounds) *bounds = vdraw->bounds;
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*@C
  PetscViewerMonitorLGSetUp - sets up a viewer to be used by line graph monitoring routines such as `KSPMonitorResidualDrawLG()`

  Collective

  Input Parameters:
+ viewer - the viewer in which to display the line graphs, it not a `PETSCVIEWERDRAW` it will set to that `PetscViewerType`
. host   - the host to open the window on, 'NULL' indicates the local host
. title  - the title at the top of the window
. metric - the label above the graph
. l      - the number of curves
. names  - the names of each curve to be used in displaying the legend. May be 'NULL'
. x      - horizontal screen coordinate of the upper left corner of window, or use `PETSC_DECIDE`
. y      - vertical screen coordinate of the upper left corner of window, or use `PETSC_DECIDE`
. m      - window width in pixels, or may use `PETSC_DECIDE` or `PETSC_DRAW_FULL_SIZE`, `PETSC_DRAW_HALF_SIZE`,`PETSC_DRAW_THIRD_SIZE`, `PETSC_DRAW_QUARTER_SIZE`
- n      - window height in pixels, or may use `PETSC_DECIDE` or `PETSC_DRAW_FULL_SIZE`, `PETSC_DRAW_HALF_SIZE`,`PETSC_DRAW_THIRD_SIZE`, `PETSC_DRAW_QUARTER_SIZE`

  Level: developer

.seealso: `PetscViewer()`, `PETSCVIEWERDRAW`, `PetscViewerDrawGetDrawLG()`, `PetscViewerDrawOpen()`, `PetscViewerDrawSetInfo()`
@*/
PetscErrorCode PetscViewerMonitorLGSetUp(PetscViewer viewer, const char host[], const char title[], const char metric[], PetscInt l, const char *names[], int x, int y, int m, int n) PeNS
{
  PetscDrawAxis axis;
  PetscDrawLG   lg;

  PetscFunctionBegin;
  PetscCall(PetscViewerSetType(viewer, PETSCVIEWERDRAW));
  PetscCall(PetscViewerDrawSetInfo(viewer, host, title, x, y, m, n));
  PetscCall(PetscViewerDrawGetDrawLG(viewer, 0, &lg));
  if (names) PetscCall(PetscDrawLGSetLegend(lg, names));
  PetscCall(PetscDrawLGSetFromOptions(lg));
  PetscCall(PetscDrawLGGetAxis(lg, &axis));
  PetscCall(PetscDrawAxisSetLabels(axis, "Convergence", "Iteration", metric));
  PetscFunctionReturn(PETSC_SUCCESS);
}