如何在圆角矩形上添加阴影 [英] How to add shadow to a round rectangle

问题描述

我正在使用vc ++/mfc绘制一个圆形矩形(OnPaint())，有人可以帮我在阴影的右边缘和下边缘添加阴影吗?

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 ?

推荐答案

圆角矩形"是矛盾词.也许你的是四舍五入的.阴影的简单模型是:-).
阴影的简单模型是根据光源移动的，呈凸起形状的稍微模糊的半透明图像，而不是边缘.它不太现实，但却被普遍接受.

我只找到了以下代码: GDI +中的模糊DropShadows [

"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

我想您是在不使用GDI的情况下完成的.您的代码可能如下所示.

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

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

现在要带来阴影效果，请更改代码，如下所示.

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

......
// 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 );
............

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