C # WinForm making irregular Forms (code)

Previously wanted to make irregular forms, mostly using API functions to implement, in C #, you can also do not use API functions can still make beautiful irregular forms, the following describes the relevant methods, the following is the code.

        private void Form1_Load (object sender, EventArgs e)        {            //Redraw window style            string fileName = @ "C:\Users\admin\ Desktop\yuan1.png ";            Bitmap Mybitmap = new Bitmap (fileName);            Createcontrolregion (this, mybitmap);            This. BackColor = color.white;//here for adding part of this              . TransparencyKey = color.white;//Here for add part          }

        <summary>///Redraw window styles///</summary>//<param name= "Control" ></pa ram>//<param name= "bitmap" ></param> public static void Createcontrolregion (Control control , Bitmap Bitmap) {//Return if control and Bitmap are NULL//Determine if there is a control and bitmap if ( Control = = NULL | |            Bitmap = = null) return; Sets the control size to bitmap size control. Width = Bitmap.            Width; Control. Height = Bitmap.            Height;             Check If we are dealing with form here//when the control is a form if (control is System.Windows.Forms.Form) {//cast to a form ' object//cast to form form ' form = (form) cont                Rol When the form's boundary FormBorderStyle is not none, the size of the form should be set slightly larger than the bitmap size. Width = control.                Width; Form. Height = control.                Height; There is no boundary form. FOrmborderstyle = Formborderstyle.none; Sets a bitmap as a form background picture.                BackgroundImage = bitmap;                Calculates the bounds of the opaque part of the bitmap GraphicsPath GraphicsPath = Calculatecontrolgraphicspath (bitmap); Apply a new region form.                Region = new Region (GraphicsPath); The following statement is added for yourself, and the problem form does not add the two sentences. Width = Bitmap.                Width; Form. Height = Bitmap.            Height; }//When the control is a Button else if (control is System.Windows.Forms.Button) {//force-Go                Change To Button button = (button) control; The button text button is not displayed.                Text = ""; Change the cursor's style button.                Cursor = Cursors.hand; Sets the button's background picture button.                BackgroundImage = bitmap;                Calculates the bounds of the opaque part of the bitmap GraphicsPath GraphicsPath = Calculatecontrolgraphicspath (bitmap); ApplyNew Region//apply a fresh zone button.                Region = new Region (GraphicsPath); button. Width = Bitmap.                Width; button. Height = Bitmap.                Height; button. FlatStyle = flatstyle.popup;//Here is the add part}} private static GraphicsPath CALCULATECONTROLGRAPHICSP            Ath (Bitmap Bitmap) {//create GraphicsPath GraphicsPath GraphicsPath = new GraphicsPath (); Use the color of the top left corner as our transparent color colortransparent = bitmap.            GetPixel (0, 0);            The first one to find the x int colopaquepixel = 0; Bias calendar All rows (y direction) for (int row = 0; row < bitmap. Height-1;                row++) {//Reset value//reset Colopaquepixel = 0; Partial Calendar All columns (x direction) for (int col = 0; col < bitmap. Width-1; col++) {//If it is a point that does not need to be processed transparently, then mark, and then continue to the biased if (bitmap. GetPixel (Col, ROW)! = colortransparent) {colopaquepixel = col;                        Create a new variable to record the current point int colnext = col; From the found opaque point, continue to find the opacity point, until you find or reach the picture width for (colnext = Colopaquepixel; Colnext < bitmap. Width; colnext++) {Color GPI = bitmap.                            GetPixel (Colnext, Row); if (bitmap.                            GetPixel (colnext, row) = = Colortransparent) {break;                            }}//Add an opaque point to the graphics path {                        Graphicspath.addrectangle (New Rectangle (Colopaquepixel, Row, Colnext-colopaquepixel, 1));                    } col = Colnext;        }}} return graphicsPath; }

Perfect!