Actual source code: ex2.c
petsc-3.12.4 2020-02-04
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      2: static char help[] = "Demonstrates use of color map\n";

      5:  #include <petscsys.h>
      6:  #include <petscdraw.h>

      8: int main(int argc,char **argv)
      9: {
     10:   PetscDraw      draw;
     11:   PetscMPIInt    size,rank;
     13:   int            x = 0,y = 0,width = 256,height = 256,i;

     15:   PetscInitialize(&argc,&argv,NULL,help);if (ierr) return ierr;
     16:   PetscDrawCreate(PETSC_COMM_WORLD,0,"Title",x,y,width,height,&draw);
     17:   PetscDrawSetFromOptions(draw);
     18:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
     19:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
     20:   for (i=rank; i<height; i+=size) {
     21:     PetscReal y = ((PetscReal)i)/(height-1);
     22:     PetscDrawLine(draw,0.0,y,1.0,y,i%256);
     23:   }
     24:   PetscDrawFlush(draw);
     25:   PetscDrawPause(draw);
     26:   PetscDrawSave(draw);
     27:   PetscDrawDestroy(&draw);
     28:   PetscFinalize();
     29:   return ierr;
     30: }

     34: /*TEST

     36:    build:
     37:      requires: x

     39:    test:
     40:      output_file: output/ex1_1.out

     42: TEST*/