Двумерна графика

#include <graphics.h>
#include <iostream>
using namespace std;

int main(){

float x[] = {-26.8, 12.2, 71.9, -34.6, 18.5, -19.4, 57.5, 43.2, 13.7};
float y[] = {32.7, -52.7, 23.6, 15.1, 68.4, 43.6, -22.5, 33.7, 30.8};
int n=sizeof(x)/sizeof(x[0]);
int x0=100;
int y0=400;
float Px=500, Py=500;
float xmin=x[0], xmax=x[0],ymin=y[0],ymax=y[0];

for(int i=0;i<n;i++){

if(x[i]<xmin){
    xmin=x[i];
}
if(x[i]<xmax){
    xmax=x[i];
}
if(y[i]<ymin){
    ymin=y[i];
}
if(y[i]<ymax){
    ymax=y[i];
}
}
float sx = (xmax-xmin)/Px;
float sy = (ymax-ymin)/Py;

initwindow(800,800);
setfillstyle(1, RED);
int xpr,ypr;

for(int i=0; i<n; i++){

xpr=x0 +(x[i]-xmin)/sx;
ypr=y0 +(y[i]-ymin)/sy;
circle(xpr,ypr,6);
}
//getch();
return 0;
}