1 static char help[] = "Demonstrates use of color map\n";
2
3 #include <petscsys.h>
4 #include <petscdraw.h>
5
main(int argc,char ** argv)6 int main(int argc, char **argv)
7 {
8 PetscDraw draw;
9 PetscMPIInt size, rank;
10 int x = 0, y = 0, width = 256, height = 256, i;
11
12 PetscFunctionBeginUser;
13 PetscCall(PetscInitialize(&argc, &argv, NULL, help));
14 PetscCall(PetscDrawCreate(PETSC_COMM_WORLD, 0, "Title", x, y, width, height, &draw));
15 PetscCall(PetscDrawSetFromOptions(draw));
16 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
17 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
18 for (i = rank; i < height; i += size) {
19 PetscReal y = ((PetscReal)i) / (height - 1);
20 PetscCall(PetscDrawLine(draw, 0.0, y, 1.0, y, i % 256));
21 }
22 PetscCall(PetscDrawFlush(draw));
23 PetscCall(PetscDrawPause(draw));
24 PetscCall(PetscDrawSave(draw));
25 PetscCall(PetscDrawDestroy(&draw));
26 PetscCall(PetscFinalize());
27 return 0;
28 }
29
30 /*TEST
31
32 build:
33 requires: x
34
35 test:
36 output_file: output/empty.out
37
38 TEST*/
39