MFC二维矩形图形进行缩放、平移、旋转的代码

以下是MFC中对二维矩形图形进行缩放、平移、旋转的代码：

1. 缩放

void CMyView::OnScale()
{
    CDC* pDC = GetDC();
    CPen pen(PS_SOLID, 1, RGB(255, 0, 0));
    pDC->SelectObject(&pen);

    CRect rect(100, 100, 200, 200);
    pDC->Rectangle(rect);

    double scaleX = 1.5;
    double scaleY = 0.8;
    CSize size(rect.Size());
    CPoint center(rect.CenterPoint());

    rect.left = (LONG)(center.x - size.cx * scaleX / 2);
    rect.right = (LONG)(center.x + size.cx * scaleX / 2);
    rect.top = (LONG)(center.y - size.cy * scaleY / 2);
    rect.bottom = (LONG)(center.y + size.cy * scaleY / 2);

    pDC->Rectangle(rect);
}

2. 平移

void CMyView::OnTranslate()
{
    CDC* pDC = GetDC();
    CPen pen(PS_SOLID, 1, RGB(255, 0, 0));
    pDC->SelectObject(&pen);

    CRect rect(100, 100, 200, 200);
    pDC->Rectangle(rect);

    int dx = 50;
    int dy = 30;
    rect.OffsetRect(dx, dy);

    pDC->Rectangle(rect);
}

3. 旋转

void CMyView::OnRotate()
{
    CDC* pDC = GetDC();
    CPen pen(PS_SOLID, 1, RGB(255, 0, 0));
    pDC->SelectObject(&pen);

    CRect rect(100, 100, 200, 200);
    pDC->Rectangle(rect);

    CPoint center(rect.CenterPoint());
    double angle = 30.0;
    double radians = angle * 3.1415926 / 180.0;

    int x = center.x + (int)((rect.left - center.x) * cos(radians) - (rect.top - center.y) * sin(radians));
    int y = center.y + (int)((rect.left - center.x) * sin(radians) + (rect.top - center.y) * cos(radians));
    rect.left = x;
    rect.top = y;

    x = center.x + (int)((rect.right - center.x) * cos(radians) - (rect.top - center.y) * sin(radians));
    y = center.y + (int)((rect.right - center.x) * sin(radians) + (rect.top - center.y) * cos(radians));
    rect.right = x;
    rect.top = y;

    x = center.x + (int)((rect.right - center.x) * cos(radians) - (rect.bottom - center.y) * sin(radians));
    y = center.y + (int)((rect.right - center.x) * sin(radians) + (rect.bottom - center.y) * cos(radians));
    rect.right = x;
    rect.bottom = y;

    x = center.x + (int)((rect.left - center.x) * cos(radians) - (rect.bottom - center.y) * sin(radians));
    y = center.y + (int)((rect.left - center.x) * sin(radians) + (rect.bottom - center.y) * cos(radians));
    rect.left = x;
    rect.bottom = y;

    pDC->Rectangle(rect);
}