1 2 static char help[] = "Demonstrates use of PetscDrawZoom()\n"; 3 4 #if defined(PETSC_APPLE_FRAMEWORK) 5 6 #include <PETSc/petscsys.h> 7 #include <PETSc/petscdraw.h> 8 #else 9 #include <petscsys.h> 10 #include <petscdraw.h> 11 #endif 12 13 PetscErrorCode zoomfunction(PetscDraw draw, void *dummy) 14 { 15 int i; 16 MPI_Comm comm = PetscObjectComm((PetscObject)draw); 17 PetscMPIInt size, rank; 18 19 PetscCallMPI(MPI_Comm_size(comm, &size)); 20 PetscCallMPI(MPI_Comm_rank(comm, &rank)); 21 for (i = rank; i < 256; i += size) { 22 PetscReal y = ((PetscReal)i) / (256 - 1); 23 PetscCall(PetscDrawLine(draw, 0.0, y, 1.0, y, i)); 24 } 25 return 0; 26 } 27 28 int main(int argc, char **argv) 29 { 30 int x = 0, y = 0, width = 256, height = 256; 31 PetscDraw draw; 32 33 PetscFunctionBeginUser; 34 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 35 PetscCall(PetscDrawCreate(PETSC_COMM_WORLD, NULL, "Title", x, y, width, height, &draw)); 36 PetscCall(PetscDrawSetFromOptions(draw)); 37 PetscCall(PetscDrawZoom(draw, zoomfunction, NULL)); 38 PetscCall(PetscDrawDestroy(&draw)); 39 PetscCall(PetscFinalize()); 40 return 0; 41 } 42 43 /*TEST 44 45 build: 46 requires: x 47 48 test: 49 output_file: output/ex1_1.out 50 51 test: 52 suffix: db 53 args: -draw_double_buffer 0 54 output_file: output/ex1_1.out 55 56 test: 57 suffix: df 58 args: -draw_fast 59 output_file: output/ex1_1.out 60 61 test: 62 suffix: dv 63 args: -draw_virtual 64 output_file: output/ex1_1.out 65 66 TEST*/ 67