C++ MFC draws a rotated rectangle

It has been pitted for a long time, and the offset should be added.

#include<cmath>
#include<cstdio>
void change(int* x, int* y, int d){
    int x0 = *x, y0 = *y;
    double sita = double(d) / 180.0f * acos(-1);
    *x = int(double(x0) * cos(sita) - double(y0) * sin(sita));
    *y = int(double(x0) * sin(sita) + double(y0) * cos(sita));
}

void CTest3View::OnDraw(CDC* pDC)
{
    CTest3Doc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    CPen pen;
    pen.CreatePen(PS_SOLID, 3 , RGB( 255 , 0 , 0 )); // Create an implementation pen 
    pDC-> SelectObject(pen);
     int x0 = 300 , y0 = 300 ;
     int x1 = 0 , y1 = 0 ;
     int x2 = 200 , y2 = 0 ;
     int x3 = 200 , y3 = 200 ;
     int x4 = 0 , y4 = 200 ;
     int i = 0 , sita =120;
    for(i = 0;i < 3;++i){
        pDC->MoveTo(x1+x0, y1+y0);
        pDC->LineTo(x2+x0, y2+y0);
        pDC->LineTo(x3+x0, y3+y0);
        pDC->LineTo(x4+x0, y4+y0);
        pDC->LineTo(x1+x0, y1+y0);

        change(&x2, &y2, sita);
        change(&x3, &y3, sita);
        change(&x4, &y4, sita);
    }
}