1 2 static char help[] = "Demonstrates use of color map\n"; 3 4 #include <petscsys.h> 5 #include <petscdraw.h> 6 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; 12 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/ex1_1.out 37 38 TEST*/ 39