Не получается построить график в PictureBox

/*------------------------------------------------------------------------*/
#include <Windows.h>
#include <math.h>
#include "Form1.h"
#define SizeAr 32000
using namespace System::Drawing;
void ThreadGrph()
{double DataBuf[SizeAr], SDataBuf[SizeAr],  result; int i;
 
                    Graphics^ g1->pictureBox1->CreateGraphics();
                    Pen^ pp1 = gcnew Pen(Brushes::Blue,2);
                    Graphics^ g2->pictureBox2->CreateGraphics();
                    Pen^ pp2 = gcnew Pen(Brushes::Red,2);
                    Graphics^ gs->pictureBox3.CreateGraphics();
                    Pen^ pps = gcnew Pen(Brushes::Green,2);
    
    for (i=0; i<SizeAr; i++)
{DataBuf[i]=-50*cos((double)i/22.5); SDataBuf[i]=DataBuf[i];
if (i>0){
                 array<Point>^ points1 = {Point(i-1,(int)DataBuf[i-1]+80),Point(i,(int)DataBuf[i]+80)};
                 g1->DrawLines(pp1,points1);
                 array<Point>^ points2 = {Point(i-1,(int)SDataBuf[i-1]+80),Point(i,(int)SDataBuf[i]+80)};
                 g2->DrawLines(pp2,points2);
                 array<Point>^ pointss = {Point(i-1,(int)SDataBuf[i-1]+80),Point(i,(int)SDataBuf[i]+80)};
                 gs->DrawLines(pps,pointss);
}
}
}
/*----------------------------------------------------------------------------------*/