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

  9:  #include <petscsys.h>
 10:  #include <petscdraw.h>
 11: #endif

 13: int main(int argc,char **argv)
 14: {
 15:   PetscDraw          draw;
 16:   PetscDrawLG        lg;
 17:   PetscDrawAxis      axis;
 18:   PetscInt           n = 15,i,x = 0,y = 0,width = 400,height = 300,nports = 1;
 19:   PetscBool          useports,flg;
 20:   const char         *xlabel,*ylabel,*toplabel,*legend;
 21:   PetscReal          xd,yd;
 22:   PetscDrawViewPorts *ports = NULL;
 23:   PetscErrorCode     ierr;

 25:   toplabel = "Top Label"; xlabel = "X-axis Label"; ylabel = "Y-axis Label"; legend = "Legend";

 27:   PetscInitialize(&argc,&argv,NULL,help);
 28:   PetscOptionsGetInt(NULL,NULL,"-x",&x,NULL);
 29:   PetscOptionsGetInt(NULL,NULL,"-y",&y,NULL);
 30:   PetscOptionsGetInt(NULL,NULL,"-width",&width,NULL);
 31:   PetscOptionsGetInt(NULL,NULL,"-height",&height,NULL);
 32:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 33:   PetscOptionsGetInt(NULL,NULL,"-nports",&nports,&useports);
 34:   PetscOptionsHasName(NULL,NULL,"-nolegend",&flg);
 35:   if (flg) legend = NULL;
 36:   PetscOptionsHasName(NULL,NULL,"-notoplabel",&flg);
 37:   if (flg) toplabel = NULL;
 38:   PetscOptionsHasName(NULL,NULL,"-noxlabel",&flg);
 39:   if (flg) xlabel = NULL;
 40:   PetscOptionsHasName(NULL,NULL,"-noylabel",&flg);
 41:   if (flg) ylabel = NULL;
 42:   PetscOptionsHasName(NULL,NULL,"-nolabels",&flg);
 43:   if (flg) {toplabel = NULL; xlabel = NULL; ylabel = NULL;}

 45:   PetscDrawCreate(PETSC_COMM_WORLD,0,"Title",x,y,width,height,&draw);
 46:   PetscDrawSetFromOptions(draw);
 47:   if (useports) {
 48:     PetscDrawViewPortsCreate(draw,nports,&ports);
 49:     PetscDrawViewPortsSet(ports,0);
 50:   }
 51:   PetscDrawLGCreate(draw,1,&lg);
 52:   PetscDrawLGSetUseMarkers(lg,PETSC_TRUE);
 53:   PetscDrawLGGetAxis(lg,&axis);
 54:   PetscDrawAxisSetColors(axis,PETSC_DRAW_BLACK,PETSC_DRAW_RED,PETSC_DRAW_BLUE);
 55:   PetscDrawAxisSetLabels(axis,toplabel,xlabel,ylabel);
 56:   PetscDrawLGSetLegend(lg,&legend);
 57:   PetscDrawLGSetFromOptions(lg);

 59:   for (i=0; i<=n; i++) {
 60:     xd   = (PetscReal)(i - 5); yd = xd*xd;
 61:     PetscDrawLGAddPoint(lg,&xd,&yd);
 62:   }
 63:   PetscDrawLGDraw(lg);
 64:   PetscDrawLGSave(lg);

 66:   PetscDrawViewPortsDestroy(ports);
 67:   PetscDrawLGDestroy(&lg);
 68:   PetscDrawDestroy(&draw);
 69:   PetscFinalize();
 70:   return ierr;
 71: }



 75: /*TEST

 77:    build:
 78:      requires: x

 80:    test:
 81:      output_file: output/ex1_1.out

 83: TEST*/