static char help[] = "Makes a simple bar graph.\n";

#include <petscsys.h>
#include <petscdraw.h>

int main(int argc, char **argv)
{
  PetscDraw         draw;
  PetscDrawBar      bar;
  PetscDrawAxis     axis;
  int               color = PETSC_DRAW_ROTATE;
  const char       *xlabel, *ylabel, *toplabel;
  const PetscReal   values[]  = {.3, .5, .05, .11};
  const char *const labels[]  = {"A", "B", "C", "D", NULL};
  PetscReal         limits[2] = {0, 0.55};
  PetscInt          nlimits   = 2;
  PetscBool         nolabels, setlimits;

  xlabel   = "X-axis Label";
  toplabel = "Top Label";
  ylabel   = "Y-axis Label";

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &argv, NULL, help));
  PetscCall(PetscOptionsHasName(NULL, NULL, "-nolabels", &nolabels));
  if (nolabels) {
    xlabel   = NULL;
    ylabel   = NULL;
    toplabel = NULL;
  }
  PetscCall(PetscOptionsGetRealArray(NULL, NULL, "-limits", limits, &nlimits, &setlimits));

  PetscCall(PetscDrawCreate(PETSC_COMM_WORLD, NULL, "Title", PETSC_DECIDE, PETSC_DECIDE, 400, 300, &draw));
  PetscCall(PetscDrawSetFromOptions(draw));
  PetscCall(PetscDrawBarCreate(draw, &bar));

  PetscCall(PetscDrawBarGetAxis(bar, &axis));
  PetscCall(PetscDrawAxisSetColors(axis, PETSC_DRAW_BLACK, PETSC_DRAW_RED, PETSC_DRAW_BLUE));
  PetscCall(PetscDrawAxisSetLabels(axis, toplabel, xlabel, ylabel));
  PetscCall(PetscDrawBarSetColor(bar, color));
  PetscCall(PetscDrawBarSetFromOptions(bar));

  if (setlimits) PetscCall(PetscDrawBarSetLimits(bar, limits[0], limits[1]));
  PetscCall(PetscDrawBarSetData(bar, 4, values, labels));
  PetscCall(PetscDrawBarDraw(bar));
  PetscCall(PetscDrawBarSave(bar));

  PetscCall(PetscDrawBarDestroy(&bar));
  PetscCall(PetscDrawDestroy(&draw));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   build:
     requires: x

   test:
     output_file: output/empty.out

TEST*/