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加菲

覆巢之下焉有完卵。出来道上混,迟早是要还的。

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在一个按钮上画图

2010-11-21 22:31:41| 分类： VC++ | 标签： |举报 |字号大中小订阅

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要在按钮上绘图，关键是要得到按钮的DC，即按钮的设备上下文，然后在设备描术表上绘图，就是通过它的dc指针调用绘图函数

按钮类CButton是CWnd类的派生类，CWnd类提供了一个成同函数，GetDC()来获取设备上下文，所以很容易就可以实现

void CTest6Dlg::OnButton3()
{
// TODO: Add your control notification handler code here
CWnd* pWnd = GetDlgItem(IDC_BUTTON2);//取到按钮的指针
CDC * pDC = pWnd->GetDC();//获取按钮的设备上下文指针
pDC->MoveTo(0,0);//绘图
pDC->LineTo(50,50);
}

当然，这样画的图形是不持久的，只是知道有这个GetDC()，能用来做这

void CTest6Dlg::OnButton1()
{
// TODO: Add your control notification handler code here
CDC *pDC = GetDC();//CWnd类的成员函数,取到CWnd的设备环境，实际是用this指针调用了对话框的成员函数，取到的是对话框的设备上下文
pDC->MoveTo(100,100);//在对话框的客户区画线
pDC->LineTo(200,200);
ReleaseDC(pDC);
}

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