2: static char help[] = "Plots a simple line graph.\n";

  4: #if defined(PETSC_APPLE_FRAMEWORK)
  5: #import <PETSc/petscsys.h>
  6: #import <PETSc/petscdraw.h>
  7: #else
  8: #include <petscsys.h>
  9: #include <petscdraw.h>
 10: #endif

 14: int main(int argc,char **argv)
 15: {
 16:   PetscDraw          draw;
 17:   PetscDrawLG        lg;
 18:   PetscDrawAxis      axis;
 19:   PetscInt           n = 20,i,x = 0,y = 0,width = 300,height = 300,nports = 1;
 20:   PetscBool          flg;
 21:   const char         *xlabel,*ylabel,*toplabel;
 22:   PetscReal          xd,yd;
 23:   PetscDrawViewPorts *ports;
 24:   PetscErrorCode     ierr;

 26:   xlabel = "X-axis Label";toplabel = "Top Label";ylabel = "Y-axis Label";

 28:   PetscInitialize(&argc,&argv,(char*)0,help);
 29:   PetscOptionsGetInt(NULL,"-width",&width,NULL);
 30:   PetscOptionsGetInt(NULL,"-height",&height,NULL);
 31:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
 32:   PetscOptionsHasName(NULL,"-nolabels",&flg);
 33:   if (flg) {
 34:     xlabel = (char*)0; toplabel = (char*)0;
 35:   }
 36:   PetscDrawCreate(PETSC_COMM_SELF,0,"Title",x,y,width,height,&draw);
 37:   PetscDrawSetFromOptions(draw);
 38:   PetscOptionsGetInt(NULL,"-nports",&nports,NULL);
 39:   PetscDrawViewPortsCreate(draw,nports,&ports);
 40:   PetscDrawViewPortsSet(ports,0);

 42:   PetscDrawLGCreate(draw,1,&lg);
 43:   PetscDrawLGGetAxis(lg,&axis);
 44:   PetscDrawAxisSetColors(axis,PETSC_DRAW_BLACK,PETSC_DRAW_RED,PETSC_DRAW_BLUE);
 45:   PetscDrawAxisSetLabels(axis,toplabel,xlabel,ylabel);

 47:   for (i=0; i<n; i++) {
 48:     xd   = (PetscReal)(i - 5); yd = xd*xd;
 49:     PetscDrawLGAddPoint(lg,&xd,&yd);
 50:   }
 51:   PetscDrawLGIndicateDataPoints(lg,PETSC_TRUE);
 52:   PetscDrawLGDraw(lg);
 53:   PetscDrawString(draw,-3.,150.0,PETSC_DRAW_BLUE,"A legend");
 54:   PetscDrawFlush(draw);

 56:   PetscDrawViewPortsDestroy(ports);
 57:   PetscDrawLGDestroy(&lg);
 58:   PetscDrawDestroy(&draw);
 59:   PetscFinalize();
 60:   return 0;
 61: }