现在,C#创建不规则窗体不是一件难事,下面总结一下:

一、自定义窗体
一般为规则的图形,如圆、椭圆等。
做法:重写Form1_Paint事件(Form1是窗体的名字),最简单的一种情况如下:
- System.Drawing.Drawing2D.GraphicsPath shape = new System.Drawing.Drawing2D.GraphicsPath();
 - shape.AddEllipse(0,0,this.Height, this.Width);
 - this.Region = new Region(shape);
 
即重绘窗体的规则。
二、利用背景图片实现
1. 设置窗体的背景图片,其中背景图片是24位(不包括24)以下的位图(BMP图片),并且要设置TansparencyKey的值,一般为你背景图片的背景色,即创建不规则图片时的底色,一般设为你图片中没有的颜色。
这种做法的不好的地方就是背景图片一定要16位或者更低的,而且还要确保客户端的显示。如果监视器的颜色深度设置大于 24 位,则不管 TransparencyKey 属性是如何设置的,窗体的非透明部分都会产生显示问题。若要避免出现这种问题,请确保“显示”控制面板中的监视器颜色深度的设置小于 24 位。当开发具有这种透明功能的应用程序时,请牢记应使您的用户意识到此问题。
实现步骤如下:
1. 新建windows application
2. 选择窗体,找到BackgroundImage属性,点击打开新的窗口,选择下面的导入资源文件,选择你的不规则的BMP图片
3. 找到窗体的TansparencyKey,将它设置为你背景图片的背景色(如黄色)
4. 找到窗体的FormBorderStyle,将其设置为none,即不显示标题栏
5. 运行
2. 跟背景图片一样的图形,不过是动态加载,遍历位图以实现不规则窗体。它的原理是这样的,在Form的load事件中写方法使得窗体的描绘区域发生改变。
实现步骤如下:
1. 建立winform应用程序
2. 找到窗体的Load事件,双击进行编辑
3. 编写方法,主要的代码如下:
- class BitmapRegion
 - {
 - public BitmapRegion()
 - { }
 - ///
 - /// Create and apply the region on the supplied control
 - /// 创建支持位图区域的控件(目前有button和form)
 - ///
 - /// The Control object to apply the region to控件
 - /// The Bitmap object to create the region from位图
 - public static void CreateControlRegion(Control control, Bitmap bitmap)
 - {
 - // Return if control and bitmap are null
 - //判断是否存在控件和位图
 - if (control == null || bitmap == null)
 - return;
 - // Set our control''s size to be the same as the bitmap
 - //设置控件大小为位图大小
 - control.Width = bitmap.Width;
 - control.Height = bitmap.Height;
 - // Check if we are dealing with Form here
 - //当控件是form时
 - if (control is System.Windows.Forms.Form)
 - {
 - // Cast to a Form object
 - //强制转换为FORM
 - Form form = (Form)control;
 - // Set our form''s size to be a little larger that the bitmap just
 - // in case the form''s border style is not set to none in the first place
 - //当FORM的边界FormBorderStyle不为NONE时,应将FORM的大小设置成比位图大小稍大一点
 - form.Width = control.Width;
 - form.Height = control.Height;
 - // No border
 - //没有边界
 - form.FormBorderStyle = FormBorderStyle.None;
 - // Set bitmap as the background image
 - //将位图设置成窗体背景图片
 - form.BackgroundImage = bitmap;
 - // Calculate the graphics path based on the bitmap supplied
 - //计算位图中不透明部分的边界
 - GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap);
 - // Apply new region
 - //应用新的区域
 - form.Region = new Region(graphicsPath);
 - }
 - // Check if we are dealing with Button here
 - //当控件是button时
 - else if (control is System.Windows.Forms.Button)
 - {
 - // Cast to a button object
 - //强制转换为 button
 - Button button = (Button)control;
 - // Do not show button text
 - //不显示button text
 - button.Text = "";
 - // Change cursor to hand when over button
 - //改变 cursor的style
 - button.Cursor = Cursors.Hand;
 - // Set background image of button
 - //设置button的背景图片
 - button.BackgroundImage = bitmap;
 - // Calculate the graphics path based on the bitmap supplied
 - //计算位图中不透明部分的边界
 - GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap);
 - // Apply new region
 - //应用新的区域
 - button.Region = new Region(graphicsPath);
 - }
 - }
 - ///
 - /// Calculate the graphics path that representing the figure in the bitmap
 - /// excluding the transparent color which is the top left pixel.
 - /// //计算位图中不透明部分的边界
 - ///
 - /// The Bitmap object to calculate our graphics path from
 - ///
 Calculated graphics path - private static GraphicsPath CalculateControlGraphicsPath(Bitmap bitmap)
 - {
 - // Create GraphicsPath for our bitmap calculation
 - //创建 GraphicsPath
 - GraphicsPath graphicsPath = new GraphicsPath();
 - // Use the top left pixel as our transparent color
 - //使用左上角的一点的颜色作为我们透明色
 - Color colorTransparent = bitmap.GetPixel(0, 0);
 - // This is to store the column value where an opaque pixel is first found.
 - // This value will determine where we start scanning for trailing opaque pixels.
 - //第一个找到点的X
 - int colOpaquePixel = 0;
 - // Go through all rows (Y axis)
 - // 偏历所有行(Y方向)
 - for (int row = 0; row < bitmap.Height; row++)
 - {
 - // Reset value
 - //重设
 - colOpaquePixel = 0;
 - // Go through all columns (X axis)
 - //偏历所有列(X方向)
 - for (int col = 0; col < bitmap.Width; col++)
 - {
 - // If this is an opaque pixel, mark it and search for anymore trailing behind
 - //如果是不需要透明处理的点则标记,然后继续偏历
 - if (bitmap.GetPixel(col, row) != colorTransparent)
 - {
 - // Opaque pixel found, mark current position
 - //记录当前
 - colOpaquePixel = col;
 - // Create another variable to set the current pixel position
 - //建立新变量来记录当前点
 - int colNext = col;
 - // Starting from current found opaque pixel, search for anymore opaque pixels
 - // trailing behind, until a transparent pixel is found or minimum width is reached
 - ///从找到的不透明点开始,继续寻找不透明点,一直到找到或则达到图片宽度
 - for (colNext = colOpaquePixel; colNext < bitmap.Width; colNext++)
 - if (bitmap.GetPixel(colNext, row) == colorTransparent)
 - break;
 - // Form a rectangle for line of opaque pixels found and add it to our graphics path
 - //将不透明点加到graphics path
 - graphicsPath.AddRectangle(new Rectangle(colOpaquePixel, row, colNext - colOpaquePixel, 1));
 - // No need to scan the line of opaque pixels just found
 - col = colNext;
 - }
 - }
 - }
 - // Return calculated graphics path
 - return graphicsPath;
 - }
 - }
 
4. 运行
三、调用类库实现
主要就是根据一些坐标,然后根据这些坐标绘制窗体
代码如下:
- public Form3()
 - {
 - InitializeComponent();
 - //创建不规则窗体
 - POINTAPI[] poin;
 - poin = new POINTAPI[5];
 - poin[0].x = 90;
 - poin[0].y = 90;
 - poin[1].x = this.Width;
 - poin[1].y = 0;
 - poin[2].x = Width;
 - poin[2].y = this.Height / 2;
 - poin[3].x = Width / 2;
 - poin[3].y = Height / 2;
 - poin[4].x = 0;
 - poin[4].y = Width;
 - Boolean flag = true;
 - IntPtr hRgn = CreatePolygonRgn(ref poin[0], 8, 1);
 - SetWindowRgn(this.Handle, hRgn, ref flag);
 - this.BackColor = Color.BurlyWood;
 - }
 - [StructLayout(LayoutKind.Sequential)]
 - private struct POINTAPI
 - {
 - internal int x;
 - internal int y;
 - }
 - [DllImport("gdi32.dll")]
 - private static extern IntPtr CreatePolygonRgn(ref POINTAPI lpPoint,int nCount,int nPolyFillMode);
 - [DllImport("user32.dll")]
 - private static extern IntPtr SetWindowRgn(IntPtr hWnd,IntPtr hRgn, ref Boolean bRedraw);
 - //设置窗体显示状态
 - [DllImport("user32.dll")]
 - private static extern int SetWindowPos(IntPtr hwnd,int hWndInsertAfter,int x,int y,int cx,int cy,int wFlags);
 - private void Start_Btn_Click(object sender, EventArgs e)
 - {//始终显示在前面
 - SetWindowPos(this.Handle, -1, 0, 0, 0, 0, 1);
 - }
 - private void button1_Click(object sender, EventArgs e)
 - {
 - //最小化始终显示在前面
 - SetWindowPos(this.Handle, -1, 0, 0, 0, 0, 0);
 - }
 
当然,我们也可以自定义窗体的动作,如按着某个轨迹一定,下面的代码中的BackgroundForm程序中就小试了一下,效果还不错,下面是这些程序的效果图(有点乱)和代码:
代码下载:http://files.cnblogs.com/alexis/IrregularForm.rar
代码是.Net 2.0的,也可以转换为其他版本的,只要运行主程序即可。
以上的四种方法有利也有弊,希望大家提意见或者更好的解决方案。
                新闻标题:详解C#创建不规则窗体的几种方式
                
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