MFC画眼睛

换画笔（画刷）颜色(参考链接：https://blog.csdn.net/sunxiving/article/details/51272001)

  • 由于画笔一旦创建后就无法修改。所以要修改画笔的颜色要用DeleteObject（）函数将其删除​，之后再创建新的画笔
  • 例子：换为白色
    CBrush brush, *oldBrush;//创建画刷
    brush.CreateSolidBrush(RGB(0,0,0));//原来为黑色
    oldBrush=pDC->SelectObject(&brush);
    pDC->Ellipse(0,0,200,100);//画一个椭圆
    brush.DeleteObject();//删掉原来brush

    brush.CreateSolidBrush(RGB(255, 251, 240));//更改颜色
    oldBrush=pDC->SelectObject(&brush);//重新选取
    pDC->Ellipse(50,0,150,100);//再画一个颜色不同的
    pDC->SelectObject(oldBrush);//还回画刷

没有参考代码，尝试自己画一波眼睛简图。

  • 只给出OnDraw(CDC* pDC)函数。
void CJustPaintView::OnDraw(CDC* pDC)//paint an eye
{
    CJustPaintDoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    // TODO: add draw code for native data here

    CRect rect;
    GetClientRect(&rect);
    pDC->SetMapMode(MM_ANISOTROPIC);
    pDC->SetWindowExt(rect.Width(), rect.Height());
    pDC->SetViewportExt(rect.Width(), -rect.Height());
    pDC->SetViewportOrg(rect.Width()/2, rect.Height()/2);
    rect.OffsetRect(-rect.Width()/2, -rect.Height()/2);//erweizuobiaoxi

    CBrush brush, *oldBrush;
    brush.CreateSolidBrush(RGB(0,0,0));
    oldBrush=pDC->SelectObject(&brush);
    pDC->Ellipse(0,0,200,100);
    brush.DeleteObject();

    //change color of brush
    brush.CreateSolidBrush(RGB(255, 251, 240));
    oldBrush=pDC->SelectObject(&brush);
    pDC->Ellipse(50,0,150,100);
    brush.DeleteObject();

    //change color of brush
    brush.CreateSolidBrush(RGB(0,0,0));
    oldBrush=pDC->SelectObject(&brush);
    pDC->Ellipse(50,25,150,75);
    brush.DeleteObject();

    //change color of brush
    brush.CreateSolidBrush(RGB(255,0,0));
    oldBrush=pDC->SelectObject(&brush);
    pDC->Ellipse(75,25,125,75);
    pDC->SelectObject(oldBrush);
}

效果