C / C++ / MFC

void CGDIPlusDlg::OnButton8() <br />
{<br />
//gets current DC<br />
CDC *pDC=this->GetDC();<br />
//gets Handle to DC<br />
HDC hdc=pDC->GetSafeHdc();<br />
<br />
//Opens an image from disk<br />
Image img(L"c:\\mspaint.tif");<br />
//target rectangle at coordinate 0,0 sizwe<br />
RectF r(0, 0, 100, 100);<br />
<br />
//Set graphics, and dest<br />
Graphics gr(hdc);<br />
RectF destRect(0, 0, 100, 100);<br />
<br />
//Draw original image-works fine<br />
gr.DrawImage(&img,destRect);<br />
<br />
//Create a blackpen (A,b,g,r), thickness 3<br />
Pen blackPen(Color(255, 0, 0, 0), 3);<br />
<br />
//Start and end point<br />
PointF point1(0, 0);<br />
PointF point2(100.0f, 100.0f);<br />
<br />
//Draw line on image---doesnt work for BW images!!<br />
Graphics gr2(&img);<br />
gr2.DrawLine(&blackPen,point1,point2);<br />
<br />
RectF destRect2(100, 0, 100, 100);<br />
gr.DrawImage(&img,destRect2);<br />
}