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 PetscErrorCode ierr; 12 int x = 0,y = 0,width = 256,height = 256,i; 13 14 ierr = PetscInitialize(&argc,&argv,NULL,help);if (ierr) return ierr; 15 ierr = PetscDrawCreate(PETSC_COMM_WORLD,0,"Title",x,y,width,height,&draw);CHKERRQ(ierr); 16 ierr = PetscDrawSetFromOptions(draw);CHKERRQ(ierr); 17 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRMPI(ierr); 18 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRMPI(ierr); 19 for (i=rank; i<height; i+=size) { 20 PetscReal y = ((PetscReal)i)/(height-1); 21 ierr = PetscDrawLine(draw,0.0,y,1.0,y,i%256);CHKERRQ(ierr); 22 } 23 ierr = PetscDrawFlush(draw);CHKERRQ(ierr); 24 ierr = PetscDrawPause(draw);CHKERRQ(ierr); 25 ierr = PetscDrawSave(draw);CHKERRQ(ierr); 26 ierr = PetscDrawDestroy(&draw);CHKERRQ(ierr); 27 ierr = PetscFinalize(); 28 return ierr; 29 } 30 31 /*TEST 32 33 build: 34 requires: x 35 36 test: 37 output_file: output/ex1_1.out 38 39 TEST*/ 40