Actual source code: ex4.c

petsc-3.8.4 2018-03-24
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  2: static char help[] = "Demonstrates use of PetscDrawZoom()\n";

  4: #if defined(PETSC_APPLE_FRAMEWORK)
  5: #include <PETSc/petscsys.h>
  6: #include <PETSc/petscdraw.h>
  7: #else
  8:  #include <petscsys.h>
  9:  #include <petscdraw.h>
 10: #endif

 12: PetscErrorCode zoomfunction(PetscDraw draw,void *dummy)
 13: {
 14:   int            i;
 15:   MPI_Comm       comm = PetscObjectComm((PetscObject)draw);
 16:   PetscMPIInt    size,rank;

 19:   MPI_Comm_size(comm,&size);
 20:   MPI_Comm_rank(comm,&rank);
 21:   for (i=rank; i<256; i+=size) {
 22:     PetscReal y = ((PetscReal)i)/(256-1);
 23:     PetscDrawLine(draw,0.0,y,1.0,y,i);
 24:   }
 25:   return 0;
 26: }

 28: int main(int argc,char **argv)
 29: {
 30:   int            x = 0,y = 0,width = 256,height = 256;
 31:   PetscDraw      draw;

 34:   PetscInitialize(&argc,&argv,NULL,help);
 35:   PetscDrawCreate(PETSC_COMM_WORLD,NULL,"Title",x,y,width,height,&draw);
 36:   PetscDrawSetFromOptions(draw);
 37:   PetscDrawZoom(draw,zoomfunction,NULL);
 38:   PetscDrawDestroy(&draw);
 39:   PetscFinalize();
 40:   return ierr;
 41: }