1 2 static char help[] = "Makes a simple histogram.\n"; 3 4 #include <petscsys.h> 5 #include <petscdraw.h> 6 7 int main(int argc,char **argv) 8 { 9 PetscDraw draw; 10 PetscDrawHG hist; 11 PetscDrawAxis axis; 12 int n = 20,i,x = 0,y = 0,width = 400,height = 300,bins = 8; 13 PetscInt w = 400,h = 300,nn = 20,b = 8,c = PETSC_DRAW_GREEN; 14 int color = PETSC_DRAW_GREEN; 15 const char *xlabel,*ylabel,*toplabel; 16 PetscReal xd; 17 PetscBool flg; 18 19 xlabel = "X-axis Label"; toplabel = "Top Label"; ylabel = "Y-axis Label"; 20 21 CHKERRQ(PetscInitialize(&argc,&argv,NULL,help)); 22 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-width",&w,NULL)); 23 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-height",&h,NULL)); 24 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-n",&nn,NULL)); 25 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-bins",&b,NULL)); 26 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-color",&c,NULL)); 27 CHKERRQ(PetscOptionsHasName(NULL,NULL,"-nolabels",&flg)); 28 width = (int) w; height = (int)h; n = (int)nn; bins = (int) b; color = (int) c; 29 if (flg) { xlabel = NULL; ylabel = NULL; toplabel = NULL; } 30 31 CHKERRQ(PetscDrawCreate(PETSC_COMM_WORLD,0,"Title",x,y,width,height,&draw)); 32 CHKERRQ(PetscDrawSetFromOptions(draw)); 33 CHKERRQ(PetscDrawHGCreate(draw,bins,&hist)); 34 CHKERRQ(PetscDrawHGSetColor(hist,color)); 35 CHKERRQ(PetscDrawHGGetAxis(hist,&axis)); 36 CHKERRQ(PetscDrawAxisSetColors(axis,PETSC_DRAW_BLACK,PETSC_DRAW_RED,PETSC_DRAW_BLUE)); 37 CHKERRQ(PetscDrawAxisSetLabels(axis,toplabel,xlabel,ylabel)); 38 /*CHKERRQ(PetscDrawHGSetFromOptions(hist));*/ 39 40 for (i=0; i<n; i++) { 41 xd = (PetscReal)(i - 5); 42 CHKERRQ(PetscDrawHGAddValue(hist,xd*xd)); 43 } 44 CHKERRQ(PetscDrawHGDraw(hist)); 45 CHKERRQ(PetscDrawHGSave(hist)); 46 47 CHKERRQ(PetscDrawHGDestroy(&hist)); 48 CHKERRQ(PetscDrawDestroy(&draw)); 49 CHKERRQ(PetscFinalize()); 50 return 0; 51 } 52 53 /*TEST 54 55 build: 56 requires: x 57 58 test: 59 output_file: output/ex1_1.out 60 61 TEST*/ 62