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How to implement special-shaped forms and controls using WinForm in C#

May 14, 2017 am 10:47 AM
c# control

这篇文章主要介绍了C# WinForm制作异形窗体与控件的方法,结合实例形式分析了WinForm制作异形窗体与控件的原理、实现步骤与相关操作技巧,需要的朋友可以参考下

本文实例讲述了C# WinForm制作异形窗体与控件的方法。分享给大家供大家参考,具体如下:

制作异形窗体或控件的思路一般都是想办法生成一个region,然后设置给指定的窗口或控件。生成region的方法有很多,最常用的就是从一幅图片生成,把该图片中的透明色部分“抠”掉,剩下的部分作为一个region。设置窗口或控件的region可以用SetWindowRgn API,不过.NET framework封装了这个操作,在C#中只要对窗口或控件的Region属性赋值就可以了。下面我就把我在C#中实现异形窗体的核心代码贴出来给大家看看,有什么意见尽管提,别客气哦

首先,是一个根据Bitmap对象生成Region的方法:

/// <summary>
/// 取得一个图片中非透明色部分的区域。
/// </summary>
/// <param name="Picture">取其区域的图片。</param>
/// <param name="TransparentColor">透明色。</param>
/// <returns>图片中非透明色部分的区域</returns>
private Region BmpRgn(Bitmap Picture, Color TransparentColor)
{
   int nWidth = Picture.Width;
   int nHeight = Picture.Height;
   Region rgn = new Region();
   rgn.MakeEmpty();
   bool isTransRgn;//前一个点是否在透明区
   Color curColor;//当前点的颜色
   Rectangle curRect = new Rectangle();
   curRect.Height = 1;
   int x = 0, y = 0;
   //逐像素扫描这个图片,找出非透明色部分区域并合并起来。
   for(y = 0; y < nHeight; ++y)
   {
     isTransRgn = true;
     for (x = 0; x < nWidth; ++x)
     {
       curColor = Picture.GetPixel(x,y);
       if(curColor == TransparentColor || x == nWidth - 1)//如果遇到透明色或行尾
          {
            if(isTransRgn == false)//退出有效区
            {
              curRect.Width = x - curRect.X;
              rgn.Union(curRect);
            }
          }
          else//非透明色
          {
            if(isTransRgn == true)//进入有效区
            {
              curRect.X = x;
              curRect.Y = y;
            }
          }//if curColor
          isTransRgn = curColor == TransparentColor;  
       }//for x
     }//for y
     return rgn;
}
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原理很简单,就是对该图片逐行扫描,在每一行中把那些非透明色的矩形(只有一个像素高)合并(union)到一个Region对象中,当扫描完整个图片,得到的也就是我们想要的Region了。这种算法在很多文章里都有介绍的。

有了region,下面就简单了:

this.Region = BmpRgn(new Bitmap("d:\\a.bmp"), Color.FromArgb(0, 0, 0));
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上面的代码就是把d:\a.bmp的轮廓作为主窗口的region的,假设该图片的背景黑色(Color.FromArgb(0, 0, 0))。

其实不光是Form,任何控件都可以用这个方法设置Region,制作出异形控件。

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