How to add shadow to a round rectangle

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I am using vc++/mfc to draw a round rectangle (OnPaint()),Can anyone help me to add shadow to a rectangle on right and bottom edges ?

Posted 12-Dec-11 20:44pm

sunny chouhan

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Sergey Alexandrovich Kryukov 13-Dec-11 3:06am

"Round rectangle"? :-)
OK, what's the problem?
--SA

2 solutions

Solution 1

"Round rectangle" is oxymoron. Perhaps yours is rounded. A simple model of a shadow is :-).
A simple model of a shadow is a slightly fuzzy semi-transparent image of the elevated shape, not the edges, shifted according to light source. It is not quite realistic but is commonly accepted.

I only found this code: Fuzzy DropShadows in GDI+[^]. Sorry, this is C# and .NET, but as the algorithm is based on GDI+, you can easily translate it; you only need the algorithm.

—SA

Posted 12-Dec-11 21:05pm

Sergey Alexandrovich Kryukov

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Emilio Garavaglia 14-Dec-11 11:00am

""Round rectangle" is oxymoron...."
In plain English yes ... in MS-APIish no: http://msdn.microsoft.com/en-us/library/aa929212.aspx

Sergey Alexandrovich Kryukov 15-Dec-11 5:59am

Ha-ha, good point. Here is the thing: this is not even a language. There is not such word "Rect", so "Round" could be another abbreviation. I prefer .NET approach where abbreviations are highly discouraged by naming conventions, for a good reason.

Thank you,
--SA

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Resmi Anna · Accepted Answer · 2011-12-12T21:31:00

I guess you have done it without using GDI. your code may look somewhat like below.

C++

.....
dc.SelectObject( &somebrush );
dc.RoundRect( x1, y1, x2, y2, p1, p2 );
......

now to bring the shadow effect change the code as below.

C++

......
// New codes Starts here
CBrush shdwBrsh;
shdwBrsh.CreateSolidBrush( GetSysColor( COLOR_BTNSHADOW ));
dc.SelectObject( &shdwBrsh );
dc.RoundRect( x1+5, y1+5, x2+5, y2+5, p1, p2 );
// New codes Ends here

dc.SelectObject( &somebrush );
dc.RoundRect( x1, y1, x2, y2, p1, p2 );
............