Actual source code: ex2.c
2: static char help[] = "Demonstrates use of color map\n";
4: #include <petscsys.h>
5: #include <petscdraw.h>
7: int main(int argc, char **argv)
8: {
9: PetscDraw draw;
10: PetscMPIInt size, rank;
11: int x = 0, y = 0, width = 256, height = 256, i;
13: PetscFunctionBeginUser;
14: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
15: PetscCall(PetscDrawCreate(PETSC_COMM_WORLD, 0, "Title", x, y, width, height, &draw));
16: PetscCall(PetscDrawSetFromOptions(draw));
17: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
18: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
19: for (i = rank; i < height; i += size) {
20: PetscReal y = ((PetscReal)i) / (height - 1);
21: PetscCall(PetscDrawLine(draw, 0.0, y, 1.0, y, i % 256));
22: }
23: PetscCall(PetscDrawFlush(draw));
24: PetscCall(PetscDrawPause(draw));
25: PetscCall(PetscDrawSave(draw));
26: PetscCall(PetscDrawDestroy(&draw));
27: PetscCall(PetscFinalize());
28: return 0;
29: }
31: /*TEST
33: build:
34: requires: x
36: test:
37: output_file: output/ex1_1.out
39: TEST*/