Actual source code: ex4.c


  2: static char help[] = "Demonstrates use of PetscDrawZoom()\n";

  4: #if defined(PETSC_APPLE_FRAMEWORK)

  6: #include <PETSc/petscsys.h>
  7: #include <PETSc/petscdraw.h>
  8: #else
  9: #include <petscsys.h>
 10: #include <petscdraw.h>
 11: #endif

 13: PetscErrorCode zoomfunction(PetscDraw draw,void *dummy)
 14: {
 15:   int         i;
 16:   MPI_Comm    comm = PetscObjectComm((PetscObject)draw);
 17:   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;

 33:   PetscInitialize(&argc,&argv,NULL,help);
 34:   PetscDrawCreate(PETSC_COMM_WORLD,NULL,"Title",x,y,width,height,&draw);
 35:   PetscDrawSetFromOptions(draw);
 36:   PetscDrawZoom(draw,zoomfunction,NULL);
 37:   PetscDrawDestroy(&draw);
 38:   PetscFinalize();
 39:   return 0;
 40: }

 42: /*TEST

 44:    build:
 45:      requires: x

 47:    test:
 48:      output_file: output/ex1_1.out

 50:    test:
 51:      suffix: db
 52:      args: -draw_double_buffer 0
 53:      output_file: output/ex1_1.out

 55:    test:
 56:      suffix: df
 57:      args: -draw_fast
 58:      output_file: output/ex1_1.out

 60:    test:
 61:      suffix: dv
 62:      args: -draw_virtual
 63:      output_file: output/ex1_1.out

 65: TEST*/