C#創(chuàng)建不規(guī)則窗體的4種方式詳解
現在,C#創(chuàng)建不規(guī)則窗體不是一件難事,下面總結一下:
一、自定義窗體
一般為規(guī)則的圖形,如圓、橢圓等。
做法:重寫Form1_Paint事件(Form1是窗體的名字),最簡單的一種情況如下:
System.Drawing.Drawing2D.GraphicsPath shape = new System.Drawing.Drawing2D.GraphicsPath(); shape.AddEllipse(0,0,this.Height, this.Width); this.Region = new Region(shape);
即重繪窗體的規(guī)則。
二、利用背景圖片實現
1. 設置窗體的背景圖片,其中背景圖片是24位(不包括24)以下的位圖(BMP圖片),并且要設置TansparencyKey的值,一般為你背景圖片的背景色,即創(chuàng)建不規(guī)則圖片時的底色,一般設為你圖片中沒有的顏色。
這種做法的不好的地方就是背景圖片一定要16位或者更低的,而且還要確??蛻舳说娘@示。如果監(jiān)視器的顏色深度設置大于 24 位,則不管 TransparencyKey 屬性是如何設置的,窗體的非透明部分都會產生顯示問題。若要避免出現這種問題,請確?!帮@示”控制面板中的監(jiān)視器顏色深度的設置小于 24 位。當開發(fā)具有這種透明功能的應用程序時,請牢記應使您的用戶意識到此問題。
實現步驟如下:
1. 新建windows application
2. 選擇窗體,找到BackgroundImage屬性,點擊打開新的窗口,選擇下面的導入資源文件,選擇你的不規(guī)則的BMP圖片
3. 找到窗體的TansparencyKey,將它設置為你背景圖片的背景色(如黃色)
4. 找到窗體的FormBorderStyle,將其設置為none,即不顯示標題欄
5. 運行
<!--[endif]-->
2. 跟背景圖片一樣的圖形,不過是動態(tài)加載,遍歷位圖以實現不規(guī)則窗體。它的原理是這樣的,在Form的load事件中寫方法使得窗體的描繪區(qū)域發(fā)生改變。
實現步驟如下:
1. 建立winform應用程序
2. 找到窗體的Load事件,雙擊進行編輯
3. 編寫方法,主要的代碼如下:
class BitmapRegion { public BitmapRegion() { } /// <summary> /// Create and apply the region on the supplied control /// 創(chuàng)建支持位圖區(qū)域的控件(目前有button和form) /// </summary> /// <param name="control">The Control object to apply the region to控件</param> /// <param name="bitmap">The Bitmap object to create the region from位圖</param> public static void CreateControlRegion(Control control, Bitmap bitmap) { // Return if control and bitmap are null //判斷是否存在控件和位圖 if (control == null || bitmap == null) return; // Set our control''s size to be the same as the bitmap //設置控件大小為位圖大小 control.Width = bitmap.Width; control.Height = bitmap.Height; // Check if we are dealing with Form here //當控件是form時 if (control is System.Windows.Forms.Form) { // Cast to a Form object //強制轉換為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 //當FORM的邊界FormBorderStyle不為NONE時,應將FORM的大小設置成比位圖大小稍大一點 form.Width = control.Width; form.Height = control.Height; // No border //沒有邊界 form.FormBorderStyle = FormBorderStyle.None; // Set bitmap as the background image //將位圖設置成窗體背景圖片 form.BackgroundImage = bitmap; // Calculate the graphics path based on the bitmap supplied //計算位圖中不透明部分的邊界 GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap); // Apply new region //應用新的區(qū)域 form.Region = new Region(graphicsPath); } // Check if we are dealing with Button here //當控件是button時 else if (control is System.Windows.Forms.Button) { // Cast to a button object //強制轉換為 button Button button = (Button)control; // Do not show button text //不顯示button text button.Text = ""; // Change cursor to hand when over button //改變 cursor的style button.Cursor = Cursors.Hand; // Set background image of button //設置button的背景圖片 button.BackgroundImage = bitmap; // Calculate the graphics path based on the bitmap supplied //計算位圖中不透明部分的邊界 GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap); // Apply new region //應用新的區(qū)域 button.Region = new Region(graphicsPath); } } /// <summary> /// Calculate the graphics path that representing the figure in the bitmap /// excluding the transparent color which is the top left pixel. /// //計算位圖中不透明部分的邊界 /// </summary> /// <param name="bitmap">The Bitmap object to calculate our graphics path from</param> /// <returns>Calculated graphics path</returns> private static GraphicsPath CalculateControlGraphicsPath(Bitmap bitmap) { // Create GraphicsPath for our bitmap calculation //創(chuàng)建 GraphicsPath GraphicsPath graphicsPath = new GraphicsPath(); // Use the top left pixel as our transparent color //使用左上角的一點的顏色作為我們透明色 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. //第一個找到點的X int colOpaquePixel = 0; // Go through all rows (Y axis) // 偏歷所有行(Y方向) for (int row = 0; row < bitmap.Height; row++) { // Reset value //重設 colOpaquePixel = 0; // Go through all columns (X axis) //偏歷所有列(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 //如果是不需要透明處理的點則標記,然后繼續(xù)偏歷 if (bitmap.GetPixel(col, row) != colorTransparent) { // Opaque pixel found, mark current position //記錄當前 colOpaquePixel = col; // Create another variable to set the current pixel position //建立新變量來記錄當前點 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 ///從找到的不透明點開始,繼續(xù)尋找不透明點,一直到找到或則達到圖片寬度 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 //將不透明點加到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.運行
<!--[endif]-->
三、調用類庫實現
主要就是根據一些坐標,然后根據這些坐標繪制窗體
代碼如下:
public Form3() { InitializeComponent(); //創(chuàng)建不規(guī)則窗體 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); //設置窗體顯示狀態(tài) [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) {//始終顯示在前面 SetWindowPos(this.Handle, -1, 0, 0, 0, 0, 1); } private void button1_Click(object sender, EventArgs e) { //最小化始終顯示在前面 SetWindowPos(this.Handle, -1, 0, 0, 0, 0, 0); }
當然,我們也可以自定義窗體的動作,如按著某個軌跡一定,下面的代碼中的BackgroundForm程序中就小試了一下,效果還不錯,下面是這些程序的效果圖:
代碼是.Net 2.0的,也可以轉換為其他版本的,只要運行主程序即可。
以上的四種方法有利也有弊,希望大家提意見或者更好的解決方案。